WorldWideScience

Sample records for videoconferencing streaming video

  1. Asynchronous video streaming vs. synchronous videoconferencing for teaching a pharmacogenetic pharmacotherapy course.

    Science.gov (United States)

    Moridani, Majid

    2007-02-15

    To compare students' performance and course evaluations for a pharmacogenetic pharmacotherapy course taught by synchronous videoconferencing method via the Internet and for the same course taught via asynchronous video streaming via the Internet. In spring 2005, a pharmacogenetic therapy course was taught to 73 students located on Amarillo, Lubbock, and Dallas campuses using synchronous videoconferencing, and in spring 2006, to 78 students located on the same 3 campuses using asynchronous video streaming. A course evaluation was administered to each group at the end of the courses. Students in the asynchronous setting had final course grades of 89% +/- 7% compared to the mean final course grade of 87% +/- 7% in the synchronous group (p = 0.05). Regardless of which technology was used, average course grades did not differ significantly among the 3 campus sites. Significantly more of the students in the asynchronous setting agreed (57%) with the statement that they could read the lecture notes and absorb the content on their own without attending the class than students in the synchronous class (23%; chi-square test; p videos over delivery of content using the synchronous or asynchronous method alone.

  2. Real-time video streaming of sonographic clips using domestic internet networks and free videoconferencing software.

    Science.gov (United States)

    Liteplo, Andrew S; Noble, Vicki E; Attwood, Ben H C

    2011-11-01

    As the use of point-of-care sonography spreads, so too does the need for remote expert over-reading via telesonogrpahy. We sought to assess the feasibility of using familiar, widespread, and cost-effective existent technology to allow remote over-reading of sonograms in real time and to compare 4 different methods of transmission and communication for both the feasibility of transmission and image quality. Sonographic video clips were transmitted using 2 different connections (WiFi and 3G) and via 2 different videoconferencing modalities (iChat [Apple Inc, Cupertino, CA] and Skype [Skype Software Sàrl, Luxembourg]), for a total of 4 different permutations. The clips were received at a remote location and recorded and then scored by expert reviewers for image quality, resolution, and detail. Wireless transmission of sonographic clips was feasible in all cases when WiFi was used and when Skype was used over a 3G connection. Images transmitted via a WiFi connection were statistically superior to those transmitted via 3G in all parameters of quality (average P = .031), and those sent by iChat were superior to those sent by Skype but not statistically so (average P = .057). Wireless transmission of sonographic video clips using inexpensive hardware, free videoconferencing software, and domestic Internet networks is feasible with retention of image quality sufficient for interpretation. WiFi transmission results in greater image quality than transmission by a 3G network.

  3. Video-conferencing for Collaborative Educational Inquiry.

    Science.gov (United States)

    Rogers, Tony; Irwin, Rita L.

    1997-01-01

    Profiles a series of video conferences that examined the effects of European settlement on the art of Aboriginal peoples in Australia and the cultural conflicts facing contemporary Aboriginal artists. The video conferences brought together Aboriginal artists and Canadian educators. Considers the role of video-conferencing in educational research…

  4. Learner concerns and teaching strategies for video-conferencing.

    Science.gov (United States)

    MacIntosh, J

    2001-01-01

    The purpose of this study was to understand the influences of interactive video-conferencing technology on learning experiences of RN students studying for baccalaureate degrees via interactive distance education. Data collection in this phenomenological study used open-ended questionnaires, interviews, and focus groups. Preliminary thematic analysis of questionnaires shaped open-ended questions for interviews and focus groups with learners confirmed findings. Students identified themes of connecting with others, organization, negative influences, and personal factors as influential to their learning. They also identified useful teaching strategies to facilitate learning within this distance nursing education environment. University nursing programs using video-conferencing for distance education can foster learning by using teaching strategies that fit the technology, increase student interaction, and engage the students.

  5. The effects of frame-rate and image quality on perceived video quality in videoconferencing

    OpenAIRE

    Thakur, Aruna; Gao, Chaunsi; Larsson, Andreas; Parnes, Peter

    2001-01-01

    This report discusses the effect of frame-rate and image quality on the perceived video quality in a specific videoconferencing application (MarratechPro). Subjects with various videoconferencing experiences took part in four experiments wherein they gave their opinions on the quality of video upon the variations in frame-rate and image quality. The results of the experiments showed that the subjects preferred high frame rate over high image quality, under the condition of limited bandwidth. ...

  6. User aware video streaming

    Science.gov (United States)

    Kerofsky, Louis; Jagannath, Abhijith; Reznik, Yuriy

    2015-03-01

    We describe the design of a video streaming system using adaptation to viewing conditions to reduce the bitrate needed for delivery of video content. A visual model is used to determine sufficient resolution needed under various viewing conditions. Sensors on a mobile device estimate properties of the viewing conditions, particularly the distance to the viewer. We leverage the framework of existing adaptive bitrate streaming systems such as HLS, Smooth Streaming or MPEG-DASH. The client rate selection logic is modified to include a sufficient resolution computed using the visual model and the estimated viewing conditions. Our experiments demonstrate significant bitrate savings compare to conventional streaming methods which do not exploit viewing conditions.

  7. Video/Videoconferencing in Support of Distance Education. Knowledge Series: A Topical, Start-Up Guide to Distance Education Practice and Delivery.

    Science.gov (United States)

    Stilborne, Linda; MacGibbon, Peter

    This document provides a start-up guide to video and videoconferencing in distance education. The first section provides and introduction to video technologies for distance education, including advantages and disadvantages. The second section covers traditional videoconferencing, including equipment and costs, videoconferencing tips, room and…

  8. Streaming-video produktion

    DEFF Research Database (Denmark)

    Grønkjær, Poul

    2004-01-01

     E-learning Lab på Aalborg Universitet har i forbindelse med forskningsprojektet Virtuelle Læringsformer og Læringsmiljøer foretaget en række praktiske eksperimenter med streaming-video produktioner. Hensigten med denne artikel er at formidle disse erfaringer. Artiklen beskriver hele produktionsf...... E-learning Lab på Aalborg Universitet har i forbindelse med forskningsprojektet Virtuelle Læringsformer og Læringsmiljøer foretaget en række praktiske eksperimenter med streaming-video produktioner. Hensigten med denne artikel er at formidle disse erfaringer. Artiklen beskriver hele...... produktionsforløbet: fra ide til færdigt produkt, forskellige typer af præsentationer, dramaturgiske overvejelser samt en konceptskitse. Streaming-video teknologien er nu så udviklet med et så tilfredsstillende audiovisuelt udtryk at vi kan begynde at fokusere på, hvilket indhold der er velegnet til at blive gjort...... tilgængeligt uafhængigt af tid og sted. Afslutningsvis er der en række kildehenvisninger, blandt andet en oversigt over de streaming-video produktioner, som denne artikel bygger på....

  9. We All Stream for Video

    Science.gov (United States)

    Technology & Learning, 2008

    2008-01-01

    More than ever, teachers are using digital video to enhance their lessons. In fact, the number of schools using video streaming increased from 30 percent to 45 percent between 2004 and 2006, according to Market Data Retrieval. Why the popularity? For starters, video-streaming products are easy to use. They allow teachers to punctuate lessons with…

  10. Exploring the Use of Video-Conferencing Technology in the Assessment of Spoken Language: A Mixed-Methods Study

    Science.gov (United States)

    Nakatsuhara, Fumiyo; Inoue, Chihiro; Berry, Vivien; Galaczi, Evelina

    2017-01-01

    This research explores how Internet-based video-conferencing technology can be used to deliver and conduct a speaking test, and what similarities and differences can be discerned between the standard and computer-mediated face-to-face modes. The context of the study is a high-stakes speaking test, and the motivation for the research is the need…

  11. Video Streaming in Online Learning

    Science.gov (United States)

    Hartsell, Taralynn; Yuen, Steve Chi-Yin

    2006-01-01

    The use of video in teaching and learning is a common practice in education today. As learning online becomes more of a common practice in education, streaming video and audio will play a bigger role in delivering course materials to online learners. This form of technology brings courses alive by allowing online learners to use their visual and…

  12. Quality scalable video data stream

    OpenAIRE

    Wiegand, T.; Kirchhoffer, H.; Schwarz, H

    2008-01-01

    An apparatus for generating a quality-scalable video data stream (36) is described which comprises means (42) for coding a video signal (18) using block-wise transformation to obtain transform blocks (146, 148) of transformation coefficient values for a picture (140) of the video signal, a predetermined scan order (154, 156, 164, 166) with possible scan positions being defined among the transformation coefficient values within the transform blocks so that in each transform block, for each pos...

  13. Electronic Eye: Streaming Video On-Demand.

    Science.gov (United States)

    Meulen, Kathleen

    2002-01-01

    Discusses the use of on-demand streaming video in school libraries. Explains how streaming works, considers advantages and technical issues, and describes products from three companies that are pioneering streaming in the educational video market. (LRW)

  14. Video streaming into the mainstream.

    Science.gov (United States)

    Garrison, W

    2001-12-01

    Changes in Internet technology are making possible the delivery of a richer mixture of media through data streaming. High-quality, dynamic content, such as video and audio, can be incorporated into Websites simply, flexibly and interactively. Technologies such as G3 mobile communication, ADSL, cable and satellites enable new ways of delivering medical services, information and learning. Systems such as Quicktime, Windows Media and Real Video provide reliable data streams as video-on-demand and users can tailor the experience to their own interests. The Learning Development Centre at the University of Portsmouth have used streaming technologies together with e-learning tools such as dynamic HTML, Flash, 3D objects and online assessment successfully to deliver on-line course content in economics and earth science. The Lifesign project--to develop, catalogue and stream health sciences media for teaching--is described and future medical applications are discussed.

  15. Android Video Streaming

    Science.gov (United States)

    2014-05-01

    be processed by a nearby high -performance computing asset and returned to a squad of Soldiers with annotations indicating the location of friendly and...is to change the resolution, bitrate, and/or framerate of the video being transmitted to the client, reducing the bandwidth requirements of the...video. This solution is typically not viable because a progressive download is required to have a constant resolution, bitrate, and framerate because

  16. Robust Watermarking of Video Streams

    Directory of Open Access Journals (Sweden)

    T. Polyák

    2006-01-01

    Full Text Available In the past few years there has been an explosion in the use of digital video data. Many people have personal computers at home, and with the help of the Internet users can easily share video files on their computer. This makes possible the unauthorized use of digital media, and without adequate protection systems the authors and distributors have no means to prevent it.Digital watermarking techniques can help these systems to be more effective by embedding secret data right into the video stream. This makes minor changes in the frames of the video, but these changes are almost imperceptible to the human visual system. The embedded information can involve copyright data, access control etc. A robust watermark is resistant to various distortions of the video, so it cannot be removed without affecting the quality of the host medium. In this paper I propose a video watermarking scheme that fulfills the requirements of a robust watermark. 

  17. High Definition Video Streaming Using H.264 Video Compression

    OpenAIRE

    Bechqito, Yassine

    2009-01-01

    This thesis presents high definition video streaming using H.264 codec implementation. The experiment carried out in this study was done for an offline streaming video but a model for live high definition streaming is introduced, as well. Prior to the actual experiment, this study describes digital media streaming. Also, the different technologies involved in video streaming are covered. These include streaming architecture and a brief overview on H.264 codec as well as high definition t...

  18. Smart Streaming for Online Video Services

    OpenAIRE

    Chen, Liang; Zhou, Yipeng; Chiu, Dah Ming

    2013-01-01

    Bandwidth consumption is a significant concern for online video service providers. Practical video streaming systems usually use some form of HTTP streaming (progressive download) to let users download the video at a faster rate than the video bitrate. Since users may quit before viewing the complete video, however, much of the downloaded video will be "wasted". To the extent that users' departure behavior can be predicted, we develop smart streaming that can be used to improve user QoE with ...

  19. Maximizing Resource Utilization in Video Streaming Systems

    Science.gov (United States)

    Alsmirat, Mohammad Abdullah

    2013-01-01

    Video streaming has recently grown dramatically in popularity over the Internet, Cable TV, and wire-less networks. Because of the resource demanding nature of video streaming applications, maximizing resource utilization in any video streaming system is a key factor to increase the scalability and decrease the cost of the system. Resources to…

  20. ADAPTIVE STREAMING OVER HTTP (DASH UNTUK APLIKASI VIDEO STREAMING

    Directory of Open Access Journals (Sweden)

    I Made Oka Widyantara

    2015-12-01

    Full Text Available This paper aims to analyze Internet-based streaming video service in the communication media with variable bit rates. The proposed scheme on Dynamic Adaptive Streaming over HTTP (DASH using the internet network that adapts to the protocol Hyper Text Transfer Protocol (HTTP. DASH technology allows a video in the video segmentation into several packages that will distreamingkan. DASH initial stage is to compress the video source to lower the bit rate video codec uses H.26. Video compressed further in the segmentation using MP4Box generates streaming packets with the specified duration. These packages are assembled into packets in a streaming media format Presentation Description (MPD or known as MPEG-DASH. Streaming video format MPEG-DASH run on a platform with the player bitdash teritegrasi bitcoin. With this scheme, the video will have several variants of the bit rates that gave rise to the concept of scalability of streaming video services on the client side. The main target of the mechanism is smooth the MPEG-DASH streaming video display on the client. The simulation results show that the scheme based scalable video streaming MPEG-DASH able to improve the quality of image display on the client side, where the procedure bufering videos can be made constant and fine for the duration of video views

  1. Apples to Oranges: Comparing Streaming Video Platforms

    OpenAIRE

    Milewski, Steven; Threatt, Monique

    2017-01-01

    Librarians rely on an ever-increasing variety of platforms to deliver streaming video content to our patrons. These two presentations will examine different aspects of video streaming platforms to gain guidance from the comparison of platforms. The first will examine the accessibility compliance of the various video streaming platforms for users with disabilities by examining accessibility features of the platforms. The second will be a comparison of subject usage of two of the larger video s...

  2. Streaming Video--The Wave of the Video Future!

    Science.gov (United States)

    Brown, Laura

    2004-01-01

    Videos and DVDs give the teachers more flexibility than slide projectors, filmstrips, and 16mm films but teachers and students are excited about a new technology called streaming. Streaming allows the educators to view videos on demand via the Internet, which works through the transfer of digital media like video, and voice data that is received…

  3. Video Streaming in the Wild West

    OpenAIRE

    Helen Gail Prosser

    2006-01-01

    Northern Lakes College in north-central Alberta is the first post-secondary institution in Canada to use the Media on Demand digital video system to stream large video files between dispersed locations (Karlsen). Staff and students at distant locations of Northern Lakes College are now viewing more than 350 videos using video streaming technology. This has been made possible by SuperNet, a high capacity broadband network that connects schools, hospitals, libraries and government offices thr...

  4. Video streaming in the Wild West

    Directory of Open Access Journals (Sweden)

    Helen Gail Prosser

    2006-11-01

    Full Text Available Northern Lakes College in north-central Alberta is the first post-secondary institution in Canada to use the Media on Demand digital video system to stream large video files between dispersed locations (Karlsen. Staff and students at distant locations of Northern Lakes College are now viewing more than 350 videos using video streaming technology. This has been made possible by SuperNet, a high capacity broadband network that connects schools, hospitals, libraries and government offices throughout the province of Alberta (Alberta SuperNet. This article describes the technical process of implementing video streaming at Northern Lakes College from March 2005 until March 2006.

  5. Web Audio/Video Streaming Tool

    Science.gov (United States)

    Guruvadoo, Eranna K.

    2003-01-01

    In order to promote NASA-wide educational outreach program to educate and inform the public of space exploration, NASA, at Kennedy Space Center, is seeking efficient ways to add more contents to the web by streaming audio/video files. This project proposes a high level overview of a framework for the creation, management, and scheduling of audio/video assets over the web. To support short-term goals, the prototype of a web-based tool is designed and demonstrated to automate the process of streaming audio/video files. The tool provides web-enabled users interfaces to manage video assets, create publishable schedules of video assets for streaming, and schedule the streaming events. These operations are performed on user-defined and system-derived metadata of audio/video assets stored in a relational database while the assets reside on separate repository. The prototype tool is designed using ColdFusion 5.0.

  6. Comparing Streaming Video and Videotapes: Can Streaming Video Convey Affective Meaning as Well as Videotape?

    Science.gov (United States)

    Cofield, Jay L.

    This study investigated whether or not low-bandwidth streaming video could be useful for affective purposes. A group of 30 students in a cinema course at a public, liberal arts university viewed a 10-minute dramatic video scene by either videotape or low-bandwidth streaming video. They also took a survey to determine their affective responses and…

  7. Authentication for Propulsion Test Streaming Video Project

    Data.gov (United States)

    National Aeronautics and Space Administration — An application was developed that could enforce two-factor authentication for NASA access to the Propulsion Test Streaming Video System.  To gain access to the...

  8. Temporal Segmentation of MPEG Video Streams

    Directory of Open Access Journals (Sweden)

    Janko Calic

    2002-06-01

    Full Text Available Many algorithms for temporal video partitioning rely on the analysis of uncompressed video features. Since the information relevant to the partitioning process can be extracted directly from the MPEG compressed stream, higher efficiency can be achieved utilizing information from the MPEG compressed domain. This paper introduces a real-time algorithm for scene change detection that analyses the statistics of the macroblock features extracted directly from the MPEG stream. A method for extraction of the continuous frame difference that transforms the 3D video stream into a 1D curve is presented. This transform is then further employed to extract temporal units within the analysed video sequence. Results of computer simulations are reported.

  9. Studi Kualitas Video Streaming Dengan Menggunakan Flexipacket Radio

    OpenAIRE

    Fadly, Auliya

    2014-01-01

    Saat ini sistem komunikasi dengan mengunakan Video Streaming seringkali menjadi alternatif dalam berkomunikasi. Salah satu software pilihan untuk layananan Video Streaming adalah Windows Media Encoder yang dapat dimanfaatkan sebagai software server dan software VLC (VIdeoLAN Client) yang dapat dimanfaatkan sebagai software Client Video Streaming. Terdapat beberapa format Video Streaming yang tersedia di layanan internet seperti FLV, Mp4, AVI dan lain-lain. Pada Tugas Akhir ini dilakukan an...

  10. Enhanced video display and navigation for networked streaming video and networked video playlists

    Science.gov (United States)

    Deshpande, Sachin

    2006-01-01

    In this paper we present an automatic enhanced video display and navigation capability for networked streaming video and networked video playlists. Our proposed method uses Synchronized Multimedia Integration Language (SMIL) as presentation language and Real Time Streaming Protocol (RTSP) as network remote control protocol to automatically generate a "enhanced video strip" display for easy navigation. We propose and describe two approaches - a smart client approach and a smart server approach. We also describe a prototype system implementation of our proposed approach.

  11. An Assessment of Streaming Video In Web-based Instruction.

    Science.gov (United States)

    Cofield, Jay L.

    Streaming video used as an augmentation in Web-based instruction was investigated to: (1) determine if demographic characteristics would lead to significantly different beliefs about the use and perceived effectiveness of streaming video, and (2) whether or not there are characteristics of streaming video that would lead to beliefs about the…

  12. Creating a streaming video collection for your library

    CERN Document Server

    Duncan, Cheryl J

    2014-01-01

    Creating a Streaming Video Collection for Your Library covers the main processes associated with streaming video, from licensing to access and evaluation, and will serve as a key reference and source of best practices for libraries adding streaming video titles to their collections.

  13. Fingerprint multicast in secure video streaming.

    Science.gov (United States)

    Zhao, H Vicky; Liu, K J Ray

    2006-01-01

    Digital fingerprinting is an emerging technology to protect multimedia content from illegal redistribution, where each distributed copy is labeled with unique identification information. In video streaming, huge amount of data have to be transmitted to a large number of users under stringent latency constraints, so the bandwidth-efficient distribution of uniquely fingerprinted copies is crucial. This paper investigates the secure multicast of anticollusion fingerprinted video in streaming applications and analyzes their performance. We first propose a general fingerprint multicast scheme that can be used with most spread spectrum embedding-based multimedia fingerprinting systems. To further improve the bandwidth efficiency, we explore the special structure of the fingerprint design and propose a joint fingerprint design and distribution scheme. From our simulations, the two proposed schemes can reduce the bandwidth requirement by 48% to 87%, depending on the number of users, the characteristics of video sequences, and the network and computation constraints. We also show that under the constraint that all colluders have the same probability of detection, the embedded fingerprints in the two schemes have approximately the same collusion resistance. Finally, we propose a fingerprint drift compensation scheme to improve the quality of the reconstructed sequences at the decoder's side without introducing extra communication overhead.

  14. Quality Adaptive Video Streaming Mechanism Using the Temporal Scalability

    Science.gov (United States)

    Lee, Sunhun; Chung, Kwangsue

    In video streaming applications over the Internet, TCP-friendly rate control schemes are useful for improving network stability and inter-protocol fairness. However, they do not always guarantee a smooth video streaming. To simultaneously satisfy both the network and user requirements, video streaming applications should be quality-adaptive. In this paper, we propose a new quality adaptation mechanism to adjust the quality of congestion-controlled video stream by controlling the frame rate. Based on the current network condition, it controls the frame rate of video stream and the sending rate in a TCP-friendly manner. Through a simulation, we prove that our adaptation mechanism appropriately adjusts the quality of video stream while improving network stability.

  15. Video streaming: implementation and evaluation in an undergraduate nursing program.

    Science.gov (United States)

    Bennett, Paul N; Glover, Pauline

    2008-02-01

    Video streaming technology enables video content, held on the web sites, to be streamed via the web. We report the implementation and evaluation of video streaming in an undergraduate nursing program in a metropolitan university in Australia. Students (n=703) were emailed a survey with a 15% response rate. We found that 91% (n=74) of respondents stated that video streaming assisted their learning. Forty-six percent(n=50) of students had difficulty accessing video streaming (particularly at the beginning of the study period). Over a 97-day period there were 8440 "hits" to the site from 1039 different internet protocol (IP) addresses. There were 4475 video streaming sessions undertaken by users. Video streaming was used for reviewing previously attended lectures (52%, n=56), examination preparation (34%, n=37), viewing missed lectures (27%, n=29) and class preparation (9%, n=10). Our experience with the introduction of video streaming has met with general enthusiasm from both students and teaching staff. Video streaming has particular relevance for rural students.

  16. Advanced real-time manipulation of video streams

    CERN Document Server

    Herling, Jan

    2014-01-01

    Diminished Reality is a new fascinating technology that removes real-world content from live video streams. This sensational live video manipulation actually removes real objects and generates a coherent video stream in real-time. Viewers cannot detect modified content. Existing approaches are restricted to moving objects and static or almost static cameras and do not allow real-time manipulation of video content. Jan Herling presents a new and innovative approach for real-time object removal with arbitrary camera movements.

  17. MEKANISME SEGMENTASI LAJU BIT PADA DYNAMIC ADAPTIVE STREAMING OVER HTTP (DASH UNTUK APLIKASI VIDEO STREAMING

    Directory of Open Access Journals (Sweden)

    Muhammad Audy Bazly

    2015-12-01

    Full Text Available This paper aims to analyze Internet-based streaming video service in the communication media with variable bit rates. The proposed scheme on Dynamic Adaptive Streaming over HTTP (DASH using the internet network that adapts to the protocol Hyper Text Transfer Protocol (HTTP. DASH technology allows a video in the video segmentation into several packages that will distreamingkan. DASH initial stage is to compress the video source to lower the bit rate video codec uses H.26. Video compressed further in the segmentation using MP4Box generates streaming packets with the specified duration. These packages are assembled into packets in a streaming media format Presentation Description (MPD or known as MPEG-DASH. Streaming video format MPEG-DASH run on a platform with the player bitdash teritegrasi bitcoin. With this scheme, the video will have several variants of the bit rates that gave rise to the concept of scalability of streaming video services on the client side. The main target of the mechanism is smooth the MPEG-DASH streaming video display on the client. The simulation results show that the scheme based scalable video streaming MPEG- DASH able to improve the quality of image display on the client side, where the procedure bufering videos can be made constant and fine for the duration of video views

  18. Students' Experiences with Live Video-Streamed Teaching Classes

    DEFF Research Database (Denmark)

    Jelsbak, Vibe Alopaeus; Buus, Lillian; Thorsen, Jonas

    2017-01-01

    Students' Experiences with Live Video-Streamed Classes The bachelor programme in biomedical laboratory technology at VIA Faculty of Health Sciences offers a combination of live video-streamed and traditional teaching. It is the student’s individual choice whether to attend classes on......-site or to attend classes from home via live video-stream. Our previous studies revealed that interaction and dialog between attendants were reduced in the live-streamed sessions compared to on-site teaching, and that the main reasons were technological issues and the teacher’s choice of teaching methods. One......-site and live video-streamed teaching. The results document a continuous progress in technological transparency, as the live video-streamed classes increasingly support the student’s flexibility in ways of attending and interacting in classes. Interaction is facilitated through teacher driven support, resulting...

  19. Introducing VAST: a Video-Audio Streaming Tester

    Directory of Open Access Journals (Sweden)

    Adrian Sterca

    2010-09-01

    Full Text Available We present a testing package aimed at video and audio streaming across best-effort networks like the Internet. VAST is intended to be a testing framework for protocols transporting audio-video streams across IP networks. It offers the simplicity and predictability of deterministic simulators like ns-2 combined with the testing power of real-world experiments.

  20. Scalable Video Streaming in Wireless Mesh Networks for Education

    Science.gov (United States)

    Liu, Yan; Wang, Xinheng; Zhao, Liqiang

    2011-01-01

    In this paper, a video streaming system for education based on a wireless mesh network is proposed. A wireless mesh network is a self-organizing, self-managing and reliable intelligent network, which allows educators to deploy a network quickly. Video streaming plays an important role in this system for multimedia data transmission. This new…

  1. Students' Experiences with Live Video-Streamed Teaching Classes

    DEFF Research Database (Denmark)

    Jelsbak, Vibe Alopaeus; Buus, Lillian; Thorsen, Jonas

    2017-01-01

    -site and live video-streamed teaching. The results document a continuous progress in technological transparency, as the live video-streamed classes increasingly support the student’s flexibility in ways of attending and interacting in classes. Interaction is facilitated through teacher driven support, resulting...

  2. Sub-Frame Crossing for Streaming Video over Wireless Networks

    OpenAIRE

    Aziz, Hussein Muzahim; Grahn, Håkan; Lundberg, Lars

    2010-01-01

    Transmitting a real time video streaming over a wireless network cannot guarantee that all the frames could be received by the mobile devices. The characteristics of a wireless network in terms of the available bandwidth, frame delay, and frame losses cannot be known in advanced. In this work, we propose a new mechanism for streaming video over a wireless channel. The proposed mechanism prevents freezing frames in the mobile devices. This is done by splitting the video frame in two sub-frames...

  3. Adaptive and ubiquitous video streaming over Wireless Mesh Networks

    Directory of Open Access Journals (Sweden)

    Malik Mubashir Hassan

    2016-10-01

    Full Text Available In recent years, with the dramatic improvement on scalability of H.264/MPEG-4 standard and growing demand for new multimedia services have spurred the research on scalable video streaming over wireless networks in both industry and academia. Video streaming applications are increasingly being deployed in Wireless Mesh Networks (WMNs. However, robust streaming of video over WMNs poses many challenges due to varying nature of wireless networks. Bit-errors, packet-losses and burst-packet-losses are very common in such type of networks, which severely influence the perceived video quality at receiving end. Therefore, a carefully-designed error recovery scheme must be employed. In this paper, we propose an interactive and ubiquitous video streaming scheme for Scalable Video Coding (SVC based video streaming over WMNs towards heterogeneous receivers. Intelligently taking the benefit of path diversity, the proposed scheme initially calculates the quality of all candidate paths and then based on quality of path it decides adaptively the size and level of error protection for all packets in order to combat the effect of losses on perceived quality of reconstructed video at receiving end. Our experimental results show that the proposed streaming approach can react to varying channel conditions with less degradation in video quality.

  4. Using DASH assisting network elements for optimizing video streaming quality

    NARCIS (Netherlands)

    J.W.M. Kleinrouweler (Jan Willem)

    2017-01-01

    textabstractOn-demand video streaming is a popular application which accounts for a large share of today's Internet traffic. Dynamic Adaptive Streaming over HTTP (DASH) is the major streaming technology used by large content providers. However, this technology suffers from performance problems when

  5. The Students Experiences With Live Video-Streamed Teaching Classes

    DEFF Research Database (Denmark)

    Jelsbak, Vibe Alopaeus; Ørngreen, Rikke; Buus, Lillian

    2017-01-01

    The Bachelor's Degree Programme of Biomedical Laboratory Science at VIA Faculty of Health Sciences offers a combination of live video-streamed and traditional teaching. It is the student’s individual choice whether to attend classes on-site or to attend classes from home via live video-stream. Our...... method inspired from mobile probes (Ørngreen & Jørgensen, n.d.). The research results document a continuous progress in technological transparency, as the live video-streamed classes increasingly support the student’s flexibility in ways of attending and interacting in classes. The analysis shows...... transparency in the live video-streamed teaching sessions during a 5-year period of continuous development of technological and pedagogical solutions for live-streamed teaching. Data describing student’s experiences were gathered in a longitudinal study of four sessions from 2012 to 2017 using a qualitative...

  6. P2P Video Streaming Strategies based on Scalable Video Coding

    Directory of Open Access Journals (Sweden)

    F.A. López-Fuentes

    2015-02-01

    Full Text Available Video streaming over the Internet has gained significant popularity during the last years, and the academy and industry have realized a great research effort in this direction. In this scenario, scalable video coding (SVC has emerged as an important video standard to provide more functionality to video transmission and storage applications. This paper proposes and evaluates two strategies based on scalable video coding for P2P video streaming services. In the first strategy, SVC is used to offer differentiated quality video to peers with heterogeneous capacities. The second strategy uses SVC to reach a homogeneous video quality between different videos from different sources. The obtained results show that our proposed strategies enable a system to improve its performance and introduce benefits such as differentiated quality of video for clients with heterogeneous capacities and variable network conditions.

  7. Research on key technologies in multiview video and interactive multiview video streaming

    OpenAIRE

    Xiu, Xiaoyu

    2011-01-01

    Emerging video applications are being developed where multiple views of a scene are captured. Two central issues in the deployment of future multiview video (MVV) systems are compression efficiency and interactive video experience, which makes it necessary to develop advanced technologies on multiview video coding (MVC) and interactive multiview video streaming (IMVS). The former aims at efficient compression of all MVV data in a ratedistortion (RD) optimal manner by exploiting both temporal ...

  8. Fast compressed domain motion detection in H.264 video streams for video surveillance applications

    DEFF Research Database (Denmark)

    Szczerba, Krzysztof; Forchhammer, Søren; Støttrup-Andersen, Jesper

    2009-01-01

    numbers of video streams on a single server. The focus of the work is on using the information in coded video streams to reduce the computational complexity and memory requirements, which translates into reduced hardware requirements and costs. The devised algorithm detects and segments activity based...

  9. The Use of Smart Glasses for Surgical Video Streaming.

    Science.gov (United States)

    Hiranaka, Takafumi; Nakanishi, Yuta; Fujishiro, Takaaki; Hida, Yuichi; Tsubosaka, Masanori; Shibata, Yosaku; Okimura, Kenjiro; Uemoto, Harunobu

    2017-04-01

    Observation of surgical procedures performed by experts is extremely important for acquisition and improvement of surgical skills. Smart glasses are small computers, which comprise a head-mounted monitor and video camera, and can be connected to the internet. They can be used for remote observation of surgeries by video streaming. Although Google Glass is the most commonly used smart glasses for medical purposes, it is still unavailable commercially and has some limitations. This article reports the use of a different type of smart glasses, InfoLinker, for surgical video streaming. InfoLinker has been commercially available in Japan for industrial purposes for more than 2 years. It is connected to a video server via wireless internet directly, and streaming video can be seen anywhere an internet connection is available. We have attempted live video streaming of knee arthroplasty operations that were viewed at several different locations, including foreign countries, on a common web browser. Although the quality of video images depended on the resolution and dynamic range of the video camera, speed of internet connection, and the wearer's attention to minimize image shaking, video streaming could be easily performed throughout the procedure. The wearer could confirm the quality of the video as the video was being shot by the head-mounted display. The time and cost for observation of surgical procedures can be reduced by InfoLinker, and further improvement of hardware as well as the wearer's video shooting technique is expected. We believe that this can be used in other medical settings.

  10. Can Viral Videos Help Beaver Restore Streams?

    Science.gov (United States)

    Castro, J. M.; Pollock, M. M.; Lewallen, G.; Jordan, C.; Woodruff, K.

    2015-12-01

    Have you watched YouTube lately? Did you notice the plethora of cute animal videos? Researchers, including members of our Beaver Restoration Research team, have been studying the restoration potential of beaver for decades, yet in the past few years, beaver have gained broad acclaim and some much deserved credit for restoration of aquatic systems in North America. Is it because people can now see these charismatic critters in action from the comfort of their laptops? While the newly released Beaver Restoration Guidebook attempts to answer many questions, sadly, this is not one of them. We do, however, address the use of beaver (Castor canadensis) in stream, wetland, and floodplain restoration and discuss the many positive effects of beaver on fluvial ecosystems. Our team, composed of researchers from NOAA National Marine Fisheries Service, US Fish and Wildlife Service, US Forest Service, and Portland State University, has developed a scientifically rigorous, yet accessible, practitioner's guide that provides a synthesis of the best available science for using beaver to improve ecosystem functions. Divided into two broad sections -- Beaver Ecology and Beaver Restoration and Management -- the guidebook focuses on the many ways in which beaver improve habitat, primarily through the construction of dams that impound water and retain sediment. In Beaver Ecology, we open with a discussion of the general effects that beaver dams have on physical and biological processes, and we close with "Frequently Asked Questions" and "Myth Busters". In Restoration and Management, we discuss common emerging restoration techniques and methods for mitigating unwanted beaver effects, followed by case studies from pioneering practitioners who have used many of these beaver restoration techniques in the field. The lessons they have learned will help guide future restoration efforts. We have also included a comprehensive beaver ecology library of over 1400 references from scientific journals

  11. Effective Quality-of-Service Renegotiating Schemes for Streaming Video

    Directory of Open Access Journals (Sweden)

    Song Hwangjun

    2004-01-01

    Full Text Available This paper presents effective quality-of-service renegotiating schemes for streaming video. The conventional network supporting quality of service generally allows a negotiation at a call setup. However, it is not efficient for the video application since the compressed video traffic is statistically nonstationary. Thus, we consider the network supporting quality-of-service renegotiations during the data transmission and study effective quality-of-service renegotiating schemes for streaming video. The token bucket model, whose parameters are token filling rate and token bucket size, is adopted for the video traffic model. The renegotiating time instants and the parameters are determined by analyzing the statistical information of compressed video traffic. In this paper, two renegotiating approaches, that is, fixed renegotiating interval case and variable renegotiating interval case, are examined. Finally, the experimental results are provided to show the performance of the proposed schemes.

  12. Receiver buffer requirement for video streaming over TCP

    Science.gov (United States)

    Kim, Taehyun; Ammar, Mostafa H.

    2006-01-01

    TCP is one of the most widely used transport protocols for video streaming. However, the rate variability of TCP makes it difficult to provide good video quality. To accommodate the variability, video streaming applications require receiver-side buffering. In current practice, however, there are no systematic guidelines for the provisioning of the receiver buffer, and smooth playout is insured through over-provisioning. In this work, we are interested in memory-constrained applications where it is important to determine the right size of receiver buffer in order to insure a prescribed video quality. To that end, we characterize video streaming over TCP in a systematic and quantitative manner. We first model a video streaming system analytically and derive an expression of receiver buffer requirement based on the model. Our analysis shows that the receiver buffer requirement is determined by the network characteristics and desired video quality. Experimental results validate our model and demonstrate that the receiver buffer requirement achieves desired video quality.

  13. Streaming Video to Enhance Students' Reflection in Dance Education

    Science.gov (United States)

    Leijen, Ali; Lam, Ineke; Wildschut, Liesbeth; Simons, P. Robert-Jan; Admiraal, Wilfried

    2009-01-01

    This paper presents an evaluation case study that describes the experiences of 15 students and 2 teachers using a video-based learning environment, DiViDU, to facilitate students' daily reflection activities in a composition course and a ballet course. To support dance students' reflection processes streaming video was applied as follows: video…

  14. Factors that Influence Learning Satisfaction Delivered by Video Streaming Technology

    Science.gov (United States)

    Keenan, Daniel Stephen

    2010-01-01

    In 2005, over 100,000 e-Learning courses were offered in over half of all U.S. postsecondary education institutions with nearly 90% of all community colleges and four year institutions offering online education. Streaming video is commonplace across the internet offering seamless video and sound anywhere connectivity is available effectively…

  15. Crowdsourcing based subjective quality assessment of adaptive video streaming

    DEFF Research Database (Denmark)

    Shahid, M.; Søgaard, Jacob; Pokhrel, J.

    2014-01-01

    humans are considered to be the most valid method of the as- sessment of QoE. Besides lab-based subjective experiments, crowdsourcing based subjective assessment of video quality is gaining popularity as an alternative method. This paper presents insights into a study that investigates perceptual pref......- erences of various adaptive video streaming scenarios through crowdsourcing based subjective quality assessment....

  16. Layer-Optimized Streaming of Motion-Compensated Orthogonal Video

    OpenAIRE

    SHEN, Wenjie

    2013-01-01

    This report presents a layer-optimized streaming technique for delivering video content over the Internet using quality-scalable motion-compensated orthogonal video. We use Motion-Compensated Orthogonal Transforms (MCOT) to remove temporal and spatial redundancy. The resulting subbands are quantized and entropy coded by Embedded Block Coding with Optimized Truncations (EBCOT). Therefore, we are able to encode the input video into multiple quality layers with sequential decoding dependency. A ...

  17. Sink or Swim: Taking Advantage of Developments in Video Streaming

    Science.gov (United States)

    Fill, Karen; Ottewill, Roger

    2006-01-01

    Amongst the many recent developments in learning technology, video streaming appears to offer a considerable range of benefits for tutors and learners alike. For these to be fully realised, however, various conditions have to be met. Merely making streams available and directing students to them, does not necessarily result in quality, or indeed…

  18. A Video Streaming Application Using Mobile Media Application Programming Interface

    Directory of Open Access Journals (Sweden)

    Henning Titi Ciptaningtyas

    2010-12-01

    Full Text Available Recently, the development of mobile phone technology is growing rapidly. These developments led to the emerging of a multimedia mobile phone that supports Wireless Local Area Network (WLAN. However, the use of WLAN technology on mobile phones to access the streaming video is very rarely encountered. While the current S60 Symbian operating system as a multimedia mobile phone is very reliable in handling a variety of media such as video.The discussion in this study presents the making of a video streaming application in mobile phone via a WLAN connection using JSR 135 technology or better known as the Mobile Media API (MMAPI. MMAPI is used to control the process of video streaming and its supporting features. The application will use the two protocols namely RTSP and HTTP. Experiment results show that the use of MMAPI on Symbian 60 based mobile phones to do video streaming is feasible and has good reliability. This is indicated by 0% packet loss on a reliable connection. In addition, the times required to play multimedia files are not affected by the size of video streaming files.

  19. Video streaming in nursing education: bringing life to online education.

    Science.gov (United States)

    Smith-Stoner, Marilyn; Willer, Ann

    2003-01-01

    Distance education is a standard form of instruction for many colleges of nursing. Web-based course and program content has been delivered primarily through text-based presentations such as PowerPoint slides and Web search activities. However, the rapid pace of technological innovation is making available more sophisticated forms of delivery such as video streaming. High-quality video streams, created at the instructor's desktop or in basic recording studios, can be produced that build on PowerPoint or create new media for use on the Web. The technology required to design, produce, and upload short video-streamed course content objects to the Internet is described. The preparation of materials, suggested production guidelines, and examples of information presented via desktop video methods are presented.

  20. Segment scheduling method for reducing 360° video streaming latency

    Science.gov (United States)

    Gudumasu, Srinivas; Asbun, Eduardo; He, Yong; Ye, Yan

    2017-09-01

    360° video is an emerging new format in the media industry enabled by the growing availability of virtual reality devices. It provides the viewer a new sense of presence and immersion. Compared to conventional rectilinear video (2D or 3D), 360° video poses a new and difficult set of engineering challenges on video processing and delivery. Enabling comfortable and immersive user experience requires very high video quality and very low latency, while the large video file size poses a challenge to delivering 360° video in a quality manner at scale. Conventionally, 360° video represented in equirectangular or other projection formats can be encoded as a single standards-compliant bitstream using existing video codecs such as H.264/AVC or H.265/HEVC. Such method usually needs very high bandwidth to provide an immersive user experience. While at the client side, much of such high bandwidth and the computational power used to decode the video are wasted because the user only watches a small portion (i.e., viewport) of the entire picture. Viewport dependent 360°video processing and delivery approaches spend more bandwidth on the viewport than on non-viewports and are therefore able to reduce the overall transmission bandwidth. This paper proposes a dual buffer segment scheduling algorithm for viewport adaptive streaming methods to reduce latency when switching between high quality viewports in 360° video streaming. The approach decouples the scheduling of viewport segments and non-viewport segments to ensure the viewport segment requested matches the latest user head orientation. A base layer buffer stores all lower quality segments, and a viewport buffer stores high quality viewport segments corresponding to the most recent viewer's head orientation. The scheduling scheme determines viewport requesting time based on the buffer status and the head orientation. This paper also discusses how to deploy the proposed scheduling design for various viewport adaptive video

  1. Continuity-Aware Scheduling Algorithm for Scalable Video Streaming

    Directory of Open Access Journals (Sweden)

    Atinat Palawan

    2016-05-01

    Full Text Available The consumer demand for retrieving and delivering visual content through consumer electronic devices has increased rapidly in recent years. The quality of video in packet networks is susceptible to certain traffic characteristics: average bandwidth availability, loss, delay and delay variation (jitter. This paper presents a scheduling algorithm that modifies the stream of scalable video to combat jitter. The algorithm provides unequal look-ahead by safeguarding the base layer (without the need for overhead of the scalable video. The results of the experiments show that our scheduling algorithm reduces the number of frames with a violated deadline and significantly improves the continuity of the video stream without compromising the average Y Peek Signal-to-Noise Ratio (PSNR.

  2. Medical Students' Perceptions of Video-Linked Lectures and Video-Streaming

    Science.gov (United States)

    Wang, RuoLan; Mattick, Karen; Dunne, Elisabeth

    2010-01-01

    Video-linked lectures allow healthcare students across multiple sites, and between university and hospital bases, to come together for the purposes of shared teaching. Recording and streaming video-linked lectures allows students to view them at a later date and provides an additional resource to support student learning. As part of a UK Higher…

  3. Case study: student perceptions of video streaming nursing class sessions.

    Science.gov (United States)

    Wall Parilo, Denise M; Parsh, Bridget

    2014-03-01

    Due to space constraints, students in their pediatric and obstetrical nursing courses received lecture in two formats: live lecture and video-streamed lecture. Live lecture is the traditional classroom format of live, in-person lecture without recording archives, whereas video streaming is live (synchronous) online lecture, also recorded for digital archive (asynchronous viewing). At the end of the semester, students (N = 53) responded to a survey about what they liked about both methods of instruction. Results reveal strengths of both methods and suggest ways to make both methods more effective. Copyright 2014, SLACK Incorporated.

  4. Study of Repair Protocols for Live Video Streaming Distributed Systems

    OpenAIRE

    Giroire, Frédéric; Huin, Nicolas

    2015-01-01

    International audience; —We study distributed systems for live video streaming. These systems can be of two types: structured and un-structured. In an unstructured system, the diffusion is done opportunistically. The advantage is that it handles churn, that is the arrival and departure of users, which is very high in live streaming systems, in a smooth way. On the opposite, in a structured system, the diffusion of the video is done using explicit diffusion trees. The advantage is that the dif...

  5. Online and unsupervised face recognition for continuous video stream

    Science.gov (United States)

    Huo, Hongwen; Feng, Jufu

    2009-10-01

    We present a novel online face recognition approach for video stream in this paper. Our method includes two stages: pre-training and online training. In the pre-training phase, our method observes interactions, collects batches of input data, and attempts to estimate their distributions (Box-Cox transformation is adopted here to normalize rough estimates). In the online training phase, our method incrementally improves classifiers' knowledge of the face space and updates it continuously with incremental eigenspace analysis. The performance achieved by our method shows its great potential in video stream processing.

  6. A Video Streaming Application Using Mobile Media Application Programming Interface

    OpenAIRE

    Henning Titi Ciptaningtyas; Henry Pratama,; Ary Mazharuddin Shiddiqi

    2010-01-01

    Recently, the development of mobile phone technology is growing rapidly. These developments led to the emerging of a multimedia mobile phone that supports Wireless Local Area Network (WLAN). However, the use of WLAN technology on mobile phones to access the streaming video is very rarely encountered. While the current S60 Symbian operating system as a multimedia mobile phone is very reliable in handling a variety of media such as video.The discussion in this study presents the making of a vid...

  7. EZBC video streaming with channel coding and error concealment

    Science.gov (United States)

    Bajic, Ivan V.; Woods, John W.

    2003-06-01

    In this text we present a system for streaming video content encoded using the motion-compensated Embedded Zero Block Coder (EZBC). The system incorporates unequal loss protection in the form of multiple description FEC (MD-FEC) coding, which provides adequate protection for the embedded video bitstream when the loss process is not very bursty. The adverse effects of burst losses are reduced using a novel motion-compensated error concealmet method.

  8. Video Streaming for Creative Writing at International Elementary School

    Directory of Open Access Journals (Sweden)

    Deni Darmawan

    2013-02-01

    Full Text Available This study aims at overcoming difficulty in learning language, both in Indonesian Language and English at international elementary school, especially in creative writing. Creative writing as part of human activity is creativity with language medium as prose (narrative, description, poem (old, new and modern, as well as drama (dialogue, role play, and sosio drama. Specific target to be achieved is the design of Video Streaming for all kinds of creative writing in the language of Indonesian and English. This investigation is a continuation of the previos investigation that has managed to make a video leaning in English for Math and Science as integrated learning to early class at international elementary school. The method used follow the principles of developmental reasearch. The firts stage is script writing video streaming through brainstorming with teachers, lecturers, teams of investigators Indonesia (UPI and Malaysia (USM. The second stage manuscript, making finalization Video Streaming, make the Web, media experts and creative writing material team investigators. The third stage, testing the Video Streaming, Web and dissemination of results into all the international elementary school in Indonesia and Malaysia.

  9. Error and Congestion Resilient Video Streaming over Broadband Wireless

    Directory of Open Access Journals (Sweden)

    Laith Al-Jobouri

    2015-04-01

    Full Text Available In this paper, error resilience is achieved by adaptive, application-layer rateless channel coding, which is used to protect H.264/Advanced Video Coding (AVC codec data-partitioned videos. A packetization strategy is an effective tool to control error rates and, in the paper, source-coded data partitioning serves to allocate smaller packets to more important compressed video data. The scheme for doing this is applied to real-time streaming across a broadband wireless link. The advantages of rateless code rate adaptivity are then demonstrated in the paper. Because the data partitions of a video slice are each assigned to different network packets, in congestion-prone wireless networks the increased number of packets per slice and their size disparity may increase the packet loss rate from buffer overflows. As a form of congestion resilience, this paper recommends packet-size dependent scheduling as a relatively simple way of alleviating the buffer-overflow problem arising from data-partitioned packets. The paper also contributes an analysis of data partitioning and packet sizes as a prelude to considering scheduling regimes. The combination of adaptive channel coding and prioritized packetization for error resilience with packet-size dependent packet scheduling results in a robust streaming scheme specialized for broadband wireless and real-time streaming applications such as video conferencing, video telephony, and telemedicine.

  10. Optimized H.264/AVC-Based Bit Stream Switching for Mobile Video Streaming

    Directory of Open Access Journals (Sweden)

    Liebl Günther

    2006-01-01

    Full Text Available We show the suitability of H.264/MPEG-4 AVC extended profile for wireless video streaming applications. In particular, we exploit the advanced bit stream switching capabilities using SP/SI pictures defined in the H.264/MPEG-4 AVC standard. For both types of switching pictures, optimized encoders are developed. We introduce a framework for dynamic switching and frame scheduling. For this purpose we define an appropriate abstract representation for media encoded for video streaming, as well as for the characteristics of wireless variable bit rate channels. The achievable performance gains over H.264/MPEG-4 AVC with constant bit rate (CBR encoding are shown for wireless video streaming over enhanced GPRS (EGPRS.

  11. Objective video presentation QoE predictor for smart adaptive video streaming

    Science.gov (United States)

    Wang, Zhou; Zeng, Kai; Rehman, Abdul; Yeganeh, Hojatollah; Wang, Shiqi

    2015-09-01

    How to deliver videos to consumers over the network for optimal quality-of-experience (QoE) has been the central goal of modern video delivery services. Surprisingly, regardless of the large volume of videos being delivered everyday through various systems attempting to improve visual QoE, the actual QoE of end consumers is not properly assessed, not to say using QoE as the key factor in making critical decisions at the video hosting, network and receiving sites. Real-world video streaming systems typically use bitrate as the main video presentation quality indicator, but using the same bitrate to encode different video content could result in drastically different visual QoE, which is further affected by the display device and viewing condition of each individual consumer who receives the video. To correct this, we have to put QoE back to the driver's seat and redesign the video delivery systems. To achieve this goal, a major challenge is to find an objective video presentation QoE predictor that is accurate, fast, easy-to-use, display device adaptive, and provides meaningful QoE predictions across resolution and content. We propose to use the newly developed SSIMplus index (https://ece.uwaterloo.ca/~z70wang/research/ssimplus/) for this role. We demonstrate that based on SSIMplus, one can develop a smart adaptive video streaming strategy that leads to much smoother visual QoE impossible to achieve using existing adaptive bitrate video streaming approaches. Furthermore, SSIMplus finds many more applications, in live and file-based quality monitoring, in benchmarking video encoders and transcoders, and in guiding network resource allocations.

  12. Adaptive Error Resilience for Video Streaming

    Directory of Open Access Journals (Sweden)

    Lakshmi R. Siruvuri

    2009-01-01

    Full Text Available Compressed video sequences are vulnerable to channel errors, to the extent that minor errors and/or small losses can result in substantial degradation. Thus, protecting compressed data against channel errors is imperative. The use of channel coding schemes can be effective in reducing the impact of channel errors, although this requires that extra parity bits to be transmitted, thus utilizing more bandwidth. However, this can be ameliorated if the transmitter can tailor the parity data rate based on its knowledge regarding current channel conditions. This can be achieved via feedback from the receiver to the transmitter. This paper describes a channel emulation system comprised of a server/proxy/client combination that utilizes feedback from the client to adapt the number of Reed-Solomon parity symbols used to protect compressed video sequences against channel errors.

  13. Some Effects of Video Streaming on Educational Achievement

    Science.gov (United States)

    Boster, Franklin J.; Meyer, Gary S.; Roberto, Anthony J.; Inge, Carol; Strom, Renee

    2006-01-01

    Although much contemporary thinking leads to the expectation that communication technology, such as video streaming, enhances educational performance on the average, a dearth of strong evidence consistent or inconsistent with this claim precludes a thoughtful evaluation of it. A series of experiments designed to examine this proposition…

  14. Video Streaming of Lectures via the Internet: An Experience.

    Science.gov (United States)

    McCrohon, Mark; Lo, Victor; Dang, Jim; Johnston, Carol

    This paper reports on an investigation into methods of efficiently introducing video streaming into subjects in the economics and commerce faculty at the University of Melbourne (Australia). Several software options were investigated before finally settling on RealSystems. The paper provides a brief review of the background of the project followed…

  15. Social Backup and Sharing of Video using HTTP Adaptive Streaming

    NARCIS (Netherlands)

    Stokking, H.M.; Klos, V.B.; Jiang, J.; Casetti, C.

    2013-01-01

    This paper is on social backup, sharing and remote access of video using HTTP Adaptive Streaming. A social backup is a backup at the location, and thus on the equipment, of (close) friends and family. Backups are created at friends’ locations, matching the hosting user’s interest with the content

  16. Struggles and Solutions for Streaming Video in the Online Classroom

    Science.gov (United States)

    Fruin, Christine

    2012-01-01

    The upcoming round of exemptions to the Digital Millennium Copyright Act of 1998 anticircumvention provision and the questions raised by the copyright infringement lawsuit filed against the against University of California, Los Angeles (UCLA) for its streaming video practices illustrate the problematic state of the law concerning the digitization…

  17. Scalable and Media Aware Adaptive Video Streaming over Wireless Networks

    Science.gov (United States)

    Tizon, Nicolas; Pesquet-Popescu, Béatrice

    2008-12-01

    This paper proposes an advanced video streaming system based on scalable video coding in order to optimize resource utilization in wireless networks with retransmission mechanisms at radio protocol level. The key component of this system is a packet scheduling algorithm which operates on the different substreams of a main scalable video stream and which is implemented in a so-called media aware network element. The concerned type of transport channel is a dedicated channel subject to parameters (bitrate, loss rate) variations on the long run. Moreover, we propose a combined scalability approach in which common temporal and SNR scalability features can be used jointly with a partitioning of the image into regions of interest. Simulation results show that our approach provides substantial quality gain compared to classical packet transmission methods and they demonstrate how ROI coding combined with SNR scalability allows to improve again the visual quality.

  18. Technology Evaluation Report 17. Videoconferencing in Theatre and Performance Studies

    Directory of Open Access Journals (Sweden)

    Mark Childs

    2003-04-01

    Full Text Available Previous reports in this series have indicated the growing acceptance of video-conferencing in education delivery. The current report compares a series of video-conferencing methods in an activity requiring precision of expression and communication: theatre and performance studies. The Accessing and Networking with National and International Expertise (ANNIE project is a two-year project undertaken jointly by the University of Warwick and the University of Kent at Canterbury, running from March 2001 to March 2003. The project's aim is to enhance students' learning experience in theatre studies by enabling access to research-based teaching and to workshops led by practitioners of national and international standing. Various technologies have been used, particularly ISDN video-conferencing, computer-mediated conferencing, and the Internet. This report concludes that video-conferencing methods will gain acceptance in education, as academic schools themselves are able to operate commonly available technology the assistance of specialised service units.

  19. A Modified Multiview Video Streaming System Using 3-Tier Architecture

    Directory of Open Access Journals (Sweden)

    Mohamed M. Fouad

    2016-01-01

    Full Text Available In this paper, we present a modified inter-view prediction Multiview Video Coding (MVC scheme from the perspective of viewer's interactivity. When a viewer requests some view(s, our scheme leads to lower transmission bit-rate. We develop an interactive multiview video streaming system exploiting that modified MVC scheme. Conventional interactive multiview video systems require high bandwidth due to redundant data being transferred. With real data test sequences, clear improvements are shown using the proposed interactive multiview video system compared to competing ones in terms of the average transmission bit-rate and storage size of the decoded (i.e., transferred data with comparable rate-distortion.

  20. Streaming Video Games: Copyright Infringement or Protected Speech?

    Directory of Open Access Journals (Sweden)

    Eirik Evert Elias Jungar

    2016-12-01

    Full Text Available Streaming video games, that is, live broadcasting playing video games on the internet, is incredibly popular. Millions tune into twitch.tv daily to watch eSport tournaments, their favourite streamer, and chat with other viewers. But all is not rosy in the world of streaming games. Recently, some game developers have aggressively exercised their copyright to, firstly, claim part of the streamers’ revenue, and secondly, control the context in which their game is shown. The article analyzes whether game developers have, and should have, such rights under EU copyright law. Reaching the conclusion that video game streams infringe the game developer’s right to communicate their works to the public, I argue that freedom of expression can and should be used to rein in their rights in certain cases. Subjecting the lawfulness of streams to game developers’ good will risks stifling the expressions of streamers. The streamers, their audience, and even the copyright holders, would be worse off for it.

  1. Development and Application of Videoconferencing Systems

    Directory of Open Access Journals (Sweden)

    Arijana Macura

    2005-03-01

    Full Text Available Videoconferencing is the best-known form of teleconferencing.It allows concwrent transmission of images and soundvia computer network for the communication of several personsphysically distant in real time. The computers are networkedand additionally equipped with camera, microphone,voice and video card, and adequate programmes. Video signalsare digitized and compressed before network transmission. Studentsand lecturers may lead discussions and exchange documentsand other malelials via the computer.

  2. A Stream Runs through IT: Using Streaming Video to Teach Information Technology

    Science.gov (United States)

    Nicholson, Jennifer; Nicholson, Darren B.

    2010-01-01

    Purpose: The purpose of this paper is to report student and faculty perceptions from an introductory management information systems course that uses multimedia, specifically streaming video, as a vehicle for teaching students skills in Microsoft Excel and Access. Design/methodology/approach: Student perceptions are captured via a qualitative…

  3. Simultaneous Class-based and Live Video Streamed Teaching

    DEFF Research Database (Denmark)

    Ørngreen, Rikke; Levinsen, Karin Ellen Tweddell; Jelsbak, Vibe Alopaeus

    2015-01-01

    The Bachelor Programme in Biomedical Laboratory Analysis at VIA's healthcare university college in Aarhus has established a blended class which combines traditional and live broadcast teaching (via an innovative choice of video conferencing system). On the so-called net-days, students have....... From here a number of general principles and perspective were derived for the specific program which can be useful to contemplate in general for similar educations. It is concluded that the blended class model using live video stream represents a viable pedagogical solution for the Bachelor Programme...... sheds light on the pedagogical challenges, the educational designs possible, the opportunities and constrains associated with video conferencing as a pedagogical practice, as well as the technological, structural and organisational conditions involved. In this paper a participatory action research...

  4. Emergency department orientation utilizing web-based streaming video.

    Science.gov (United States)

    Mahadevan, Swaminatha V; Gisondi, Michael A; Sovndal, Shannon S; Gilbert, Gregory H

    2004-08-01

    To assure a smooth transition to their new work environment, rotating students and housestaff require detailed orientations to the physical layout and operations of the emergency department. Although such orientations are useful for new staff members, they represent a significant time commitment for the faculty members charged with this task. To address this issue, the authors developed a series of short instructional videos that provide a comprehensive and consistent method of emergency department orientation. The videos are viewed through Web-based streaming technology that allows learners to complete the orientation process from any computer with Internet access before their first shift. This report describes the stepwise process used to produce these videos and discusses the potential benefits of converting to an Internet-based orientation system.

  5. In-Network Adaptation of Video Streams Using Network Processors

    Directory of Open Access Journals (Sweden)

    Mohammad Shorfuzzaman

    2009-01-01

    problem can be addressed, near the network edge, by applying dynamic, in-network adaptation (e.g., transcoding of video streams to meet available connection bandwidth, machine characteristics, and client preferences. In this paper, we extrapolate from earlier work of Shorfuzzaman et al. 2006 in which we implemented and assessed an MPEG-1 transcoding system on the Intel IXP1200 network processor to consider the feasibility of in-network transcoding for other video formats and network processor architectures. The use of “on-the-fly” video adaptation near the edge of the network offers the promise of simpler support for a wide range of end devices with different display, and so forth, characteristics that can be used in different types of environments.

  6. Video Streaming Transfer in a Smart Satellite Mobile Environment

    Directory of Open Access Journals (Sweden)

    Nedo Celandroni

    2009-01-01

    satellite link for transmitting video streams to a bus, where they are relayed to passengers' devices. We say that a bus works in smart mode if it takes advantage of the knowledge of the exact points where fixed obstacles will prevent receiving the satellite signal for a certain time period. This information is sent to the hub via a return channel. The hub, in its turn, suspends the transmissions to that specific bus for the given time interval, thus avoiding information losses and unnecessary bandwidth occupation. Buffering video packets, without any quality of service (QoS degradation, seamlessly compensates channel blockages up to a given duration. We determine the most appropriate transmission parameters for video streaming with good video QoS in a mobile satellite environment; moreover, we evaluate how “smart” the system can be in terms of bandwidth saving, by comparing it with the situation where the bus does not exploit the description of its route, still maintaining the same QoS requirements.

  7. Application-adapted mobile 3D video coding and streaming — A survey

    Science.gov (United States)

    Liu, Yanwei; Ci, Song; Tang, Hui; Ye, Yun

    2012-03-01

    3D video technologies have been gradually matured to be moved into mobile platforms. In the mobile environments, the specific characteristics of wireless network and mobile device present great challenges for 3D video coding and streaming. The application-adapted mobile 3D video coding and streaming technologies are urgently needed. Based on the mobile 3D video application framework, this paper reviews the state-of-the-art technologies of mobile 3D video coding and streaming. Specifically, the mobile 3D video formats and the corresponding coding methods are firstly reviewed and then the streaming adaptation technologies including 3D video transcoding, 3D video rate control and cross-layer optimized 3D video streaming are surveyed. [Figure not available: see fulltext.

  8. Effects of Video Streaming Technology on Public Speaking Students' Communication Apprehension and Competence

    Science.gov (United States)

    Dupagne, Michel; Stacks, Don W.; Giroux, Valerie Manno

    2007-01-01

    This study examines whether video streaming can reduce trait and state communication apprehension, as well as improve communication competence, in public speaking classes. Video streaming technology has been touted as the next generation of video feedback for public speaking students because it is not limited by time or space and allows Internet…

  9. Questioning, Promoting and Evaluating the Use of Streaming Video To Support Student Learning.

    Science.gov (United States)

    Shephard, Kerry

    2003-01-01

    Uses case studies to describe how streaming video is currently used to support student learning in post-compulsory education in the United Kingdom. Describes the current role of streaming video and identifies processes that could extend the application of streaming in education. Identifies elements of a research agenda that could further develop…

  10. Real-Time Audio-Visual Analysis for Multiperson Videoconferencing

    Directory of Open Access Journals (Sweden)

    Petr Motlicek

    2013-01-01

    Full Text Available We describe the design of a system consisting of several state-of-the-art real-time audio and video processing components enabling multimodal stream manipulation (e.g., automatic online editing for multiparty videoconferencing applications in open, unconstrained environments. The underlying algorithms are designed to allow multiple people to enter, interact, and leave the observable scene with no constraints. They comprise continuous localisation of audio objects and its application for spatial audio object coding, detection, and tracking of faces, estimation of head poses and visual focus of attention, detection and localisation of verbal and paralinguistic events, and the association and fusion of these different events. Combined all together, they represent multimodal streams with audio objects and semantic video objects and provide semantic information for stream manipulation systems (like a virtual director. Various experiments have been performed to evaluate the performance of the system. The obtained results demonstrate the effectiveness of the proposed design, the various algorithms, and the benefit of fusing different modalities in this scenario.

  11. Efficient Video Streaming Scheme for Next Generations of Mobile Networks

    Directory of Open Access Journals (Sweden)

    Majdi Ashibani

    2005-04-01

    Full Text Available Video streaming over next generations of mobile networks has undergone enormous development recently due to the continuing growth in wireless communication, especially since the emergence of 3G wireless networks. The new generations of wireless networks pose many challenges, including supporting quality of service over wireless communication links. This is due to the time-varying characteristics of wireless channel. Therefore, a more flexible and efficient bandwidth allocation scheme is needed. This paper is a part of ongoing work to come up with a more robust scheme that is capable of rapidly adapting to changes in network conditions. The proposed scheme focuses on the wireless part of the network, providing high quality video service and better utilization of network resources.

  12. Software support for video streaming from smartphone on small airship

    OpenAIRE

    Carretero Rodríguez, Miguel

    2009-01-01

    This project has been created to study and to solve two goals. The main goal has been streaming real video from a smartphone to a laptop and the second goal has been to control the airship electronics from the smartphone. To achieve the main goal of the project, firstly has been necessary realize a technologies study to select the better choice. The chosen technology has been to use of wi-fi, mainly due to the high transmission speed. Once the technology has been chosen, an ad-hoc wi-fi netwo...

  13. Thermal imagers: from ancient analog video output to state-of-the-art video streaming

    Science.gov (United States)

    Haan, Hubertus; Feuchter, Timo; Münzberg, Mario; Fritze, Jörg; Schlemmer, Harry

    2013-06-01

    The video output of thermal imagers stayed constant over almost two decades. When the famous Common Modules were employed a thermal image at first was presented to the observer in the eye piece only. In the early 1990s TV cameras were attached and the standard output was CCIR. In the civil camera market output standards changed to digital formats a decade ago with digital video streaming being nowadays state-of-the-art. The reasons why the output technique in the thermal world stayed unchanged over such a long time are: the very conservative view of the military community, long planning and turn-around times of programs and a slower growth of pixel number of TIs in comparison to consumer cameras. With megapixel detectors the CCIR output format is not sufficient any longer. The paper discusses the state-of-the-art compression and streaming solutions for TIs.

  14. Streaming Videos in Peer Assessment to Support Training Pre-Service Teachers

    Science.gov (United States)

    Wu, Cheng-Chih; Kao, Hue-Ching

    2008-01-01

    A web-based peer assessment system using video streaming technology was implemented to support the training of pre-service teachers. The peer assessment process was synchronized with viewing of peer teaching videos so that comments could be linked to the relevant position on the video. When one viewed a comment, the associated video segment could…

  15. Videos of Basal Ice in Boreholes on the Kamb Ice Stream in West Antarctica, Version 1

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set is a collection of video data of basal ice taken in a borehole on the Kamb Ice Stream in West Antarctica. Ice streams are an expression of the inherent...

  16. A modular video streaming method for surgical assistance in operating room networks.

    Science.gov (United States)

    Voruganti, Arun Kumar Raj; Mayoral, Rafael; Vazquez, Adrian; Burgert, Oliver

    2010-09-01

    Continuous video is used with increasing frequency in the operating room for minimally invasive laparoscopic and endoscopic procedures. Video data communication in the OR requires device interoperability, efficient data transfer methods, and specialized IT infrastructure. A framework for digital video communication based on a two channel client-server architecture was developed and tested. One channel is used for stream handling and the second channel is used for data streaming. A video stream description (VSD) specification is defined to negotiate video stream characteristics and ensure semantic interoperability. Quality assessment of the streamed data employs an image-based structural quality measure called the Structural Similarity (SSIM) Index. By introducing the stream description and a quality metric, the stream parameters can be modified as needed. The video communication framework ensures interoperability by defining interfaces for each of the streaming architecture modules. To prove the framework's feasibility, two prototype applications were developed and performance tests were performed on a dedicated OR network. The results showed acceptable network performance for streaming video in the OR network under clinically realistic conditions. An OR video communications framework was developed that uses existing OR network infrastructure as an economical alternative to dedicated integrated OR solutions. This framework provides functional and semantic interoperability among imaging modalities for continuous video data communication.

  17. Simulation and experimental testbed for adaptive video streaming in ad hoc networks

    OpenAIRE

    Gonzalez-Martinez, Santiago Renan; Castellanos Hernández, Wilder Eduardo; Guzman Castillo, Paola Fernanda; Arce Vila, Pau; Guerri Cebollada, Juan Carlos

    2016-01-01

    This paper presents a performance evaluation of the scalable video streaming over mobile ad hoc networks. In particular, we focus on the rate-adaptive method for streaming scalable video (H.264/SVC). For effective adaptation a new cross-layer routing protocol is introduced. This protocol provides an efficient algorithm for available bandwidth estimation. With this information, the video source adjusts its bit rate during the video transmission according to the network state. We also propose a...

  18. Interactive streaming of stored multiview video using redundant frame structures.

    Science.gov (United States)

    Cheung, Gene; Ortega, Antonio; Cheung, Ngai-Man

    2011-03-01

    While much of multiview video coding focuses on the rate-distortion performance of compressing all frames of all views for storage or non-interactive video delivery over networks, we address the problem of designing a frame structure to enable interactive multiview streaming, where clients can interactively switch views during video playback. Thus, as a client is playing back successive frames (in time) for a given view, it can send a request to the server to switch to a different view while continuing uninterrupted temporal playback. Noting that standard tools for random access (i.e., I-frame insertion) can be bandwidth-inefficient for this application, we propose a redundant representation of I-, P-, and "merge" frames, where each original picture can be encoded into multiple versions, appropriately trading off expected transmission rate with storage, to facilitate view switching. We first present ad hoc frame structures with good performance when the view-switching probabilities are either very large or very small. We then present optimization algorithms that generate more general frame structures with better overall performance for the general case. We show in our experiments that we can generate redundant frame structures offering a range of tradeoff points between transmission and storage, e.g., outperforming simple I-frame insertion structures by up to 45% in terms of bandwidth efficiency at twice the storage cost.

  19. Subjective quality assessment of an adaptive video streaming model

    Science.gov (United States)

    Tavakoli, Samira; Brunnström, Kjell; Wang, Kun; Andrén, Börje; Shahid, Muhammad; Garcia, Narciso

    2014-01-01

    With the recent increased popularity and high usage of HTTP Adaptive Streaming (HAS) techniques, various studies have been carried out in this area which generally focused on the technical enhancement of HAS technology and applications. However, a lack of common HAS standard led to multiple proprietary approaches which have been developed by major Internet companies. In the emerging MPEG-DASH standard the packagings of the video content and HTTP syntax have been standardized; but all the details of the adaptation behavior are left to the client implementation. Nevertheless, to design an adaptation algorithm which optimizes the viewing experience of the enduser, the multimedia service providers need to know about the Quality of Experience (QoE) of different adaptation schemes. Taking this into account, the objective of this experiment was to study the QoE of a HAS-based video broadcast model. The experiment has been carried out through a subjective study of the end user response to various possible clients' behavior for changing the video quality taking different QoE-influence factors into account. The experimental conclusions have made a good insight into the QoE of different adaptation schemes which can be exploited by HAS clients for designing the adaptation algorithms.

  20. PET protection optimization for streaming scalable videos with multiple transmissions.

    Science.gov (United States)

    Xiong, Ruiqin; Taubman, David S; Sivaraman, Vijay

    2013-11-01

    This paper investigates priority encoding transmission (PET) protection for streaming scalably compressed video streams over erasure channels, for the scenarios where a small number of retransmissions are allowed. In principle, the optimal protection depends not only on the importance of each stream element, but also on the expected channel behavior. By formulating a collection of hypotheses concerning its own behavior in future transmissions, limited-retransmission PET (LR-PET) effectively constructs channel codes spanning multiple transmission slots and thus offers better protection efficiency than the original PET. As the number of transmission opportunities increases, the optimization for LR-PET becomes very challenging because the number of hypothetical retransmission paths increases exponentially. As a key contribution, this paper develops a method to derive the effective recovery-probability versus redundancy-rate characteristic for the LR-PET procedure with any number of transmission opportunities. This significantly accelerates the protection assignment procedure in the original LR-PET with only two transmissions, and also makes a quick and optimal protection assignment feasible for scenarios where more transmissions are possible. This paper also gives a concrete proof to the redundancy embedding property of the channel codes formed by LR-PET, which allows for a decoupled optimization for sequentially dependent source elements with convex utility-length characteristic. This essentially justifies the source-independent construction of the protection convex hull for LR-PET.

  1. Adaptive Bit Rate Video Streaming Through an RF/Free Space Optical Laser Link

    Directory of Open Access Journals (Sweden)

    A. Akbulut

    2010-06-01

    Full Text Available This paper presents a channel-adaptive video streaming scheme which adjusts video bit rate according to channel conditions and transmits video through a hybrid RF/free space optical (FSO laser communication system. The design criteria of the FSO link for video transmission to 2.9 km distance have been given and adaptive bit rate video streaming according to the varying channel state over this link has been studied. It has been shown that the proposed structure is suitable for uninterrupted transmission of videos over the hybrid wireless network with reduced packet delays and losses even when the received power is decreased due to weather conditions.

  2. Layer-based buffer aware rate adaptation design for SHVC video streaming

    Science.gov (United States)

    Gudumasu, Srinivas; Hamza, Ahmed; Asbun, Eduardo; He, Yong; Ye, Yan

    2016-09-01

    This paper proposes a layer based buffer aware rate adaptation design which is able to avoid abrupt video quality fluctuation, reduce re-buffering latency and improve bandwidth utilization when compared to a conventional simulcast based adaptive streaming system. The proposed adaptation design schedules DASH segment requests based on the estimated bandwidth, dependencies among video layers and layer buffer fullness. Scalable HEVC video coding is the latest state-of-art video coding technique that can alleviate various issues caused by simulcast based adaptive video streaming. With scalable coded video streams, the video is encoded once into a number of layers representing different qualities and/or resolutions: a base layer (BL) and one or more enhancement layers (EL), each incrementally enhancing the quality of the lower layers. Such layer based coding structure allows fine granularity rate adaptation for the video streaming applications. Two video streaming use cases are presented in this paper. The first use case is to stream HD SHVC video over a wireless network where available bandwidth varies, and the performance comparison between proposed layer-based streaming approach and conventional simulcast streaming approach is provided. The second use case is to stream 4K/UHD SHVC video over a hybrid access network that consists of a 5G millimeter wave high-speed wireless link and a conventional wired or WiFi network. The simulation results verify that the proposed layer based rate adaptation approach is able to utilize the bandwidth more efficiently. As a result, a more consistent viewing experience with higher quality video content and minimal video quality fluctuations can be presented to the user.

  3. Live streaming video for medical education: a laboratory model.

    Science.gov (United States)

    Gandsas, Alejandro; McIntire, Katherine; Palli, Guillermo; Park, Adrian

    2002-10-01

    At the University of Kentucky (UK), we applied streaming video technology to develop a webcast model that will allow institutions to broadcast live and prerecorded surgeries, conferences, and courses in real time over networks (the Internet or an intranet). We successfully broadcast a prerecorded laparoscopic paraesophageal hernia repair to domestic and international clients by using desktop computers equipped with off-the-shelf, streaming-enabled software and standard hardware and operating systems. A web-based user interface made accessing the educational material as simple as a mouse click and allowed clients to participate in the broadcast event via an embedded e-mail/chat module. Three client computers (two connected to the Internet and a third connected to the UK intranet) requested and displayed the surgical film by means of seven common network connection configurations. Significantly, no difference in image resolution was detected with the use of a connection speed faster than 128 kilobytes per second (kbps). At this connection speed, an average bandwidth of 32.7 kbps was used, and although a 15-second delay was experienced from the time of data request to data display, the surgical film streamed continuously from beginning to end at a mean rate of 14.4 frames per second (fps). The clients easily identified all anatomic structures in full color motion, clearly followed all steps of the surgical procedure, and successfully asked questions and made comments by using the e-mail/chat module while viewing the surgery. With minimal financial investment, we have created an interactive virtual classroom with the potential to attract a global audience. Our webcast model represents a simple and practical method for institutions to supplement undergraduate and graduate surgical education and offer continuing medical education credits in a way that is convenient for clients (surgeons, students, residents, others). In the future, physicians may access streaming webcast

  4. Networked telepresence system using web browsers and omni-directional video streams

    Science.gov (United States)

    Ishikawa, Tomoya; Yamazawa, Kazumasa; Sato, Tomokazu; Ikeda, Sei; Nakamura, Yutaka; Fujikawa, Kazutoshi; Sunahara, Hideki; Yokoya, Naokazu

    2005-03-01

    In this paper, we describe a new telepresence system which enables a user to look around a virtualized real world easily in network environments. The proposed system includes omni-directional video viewers on web browsers and allows the user to look around the omni-directional video contents on the web browsers. The omni-directional video viewer is implemented as an Active-X program so that the user can install the viewer automatically only by opening the web site which contains the omni-directional video contents. The system allows many users at different sites to look around the scene just like an interactive TV using a multi-cast protocol without increasing the network traffic. This paper describes the implemented system and the experiments using live and stored video streams. In the experiment with stored video streams, the system uses an omni-directional multi-camera system for video capturing. We can look around high resolution and high quality video contents. In the experiment with live video streams, a car-mounted omni-directional camera acquires omni-directional video streams surrounding the car, running in an outdoor environment. The acquired video streams are transferred to the remote site through the wireless and wired network using multi-cast protocol. We can see the live video contents freely in arbitrary direction. In the both experiments, we have implemented a view-dependent presentation with a head-mounted display (HMD) and a gyro sensor for realizing more rich presence.

  5. Training for surgeons using digital satellite television and videoconferencing.

    Science.gov (United States)

    Kingsnorth, A; Vranch, A; Campbell, J

    2000-01-01

    The TETRASUR project (TELematics TRAining for SURgeons) has investigated the effectiveness of distance-learning technologies in the delivery of training for doctors who are studying for membership of the Royal College of Surgeons. Digital satellite television receivers and ISDN videoconferencing equipment have been installed in hospitals to deliver the course modules, including a series of live television programmes transmitted by satellite. ISDN videoconferencing was integrated, live, into the satellite broadcasts to bring in guest lecturers and for interactive discussions with the trainee doctors. Videoconferencing was also used for seminars and discussion groups. These methods proved to be effective and popular with the doctors, although there was some dissatisfaction with the visual quality of the ISDN videoconferencing at 128 kbit/s. Efforts are now being made to improve the quality of the video feed from remote sites using ISDN at 384 kbit/s.

  6. Using Video Streaming: Setting Up a Cheap System for Distributing Information to Teachers and Students

    Science.gov (United States)

    McNeal, Thomas, Jr.; Kearns, Landon

    2005-01-01

    Video streaming can be a very useful tool for educators. It is now possible for a school?s technical specialist or classroom teacher to create a streaming server with tools that are available in many classrooms. In this article we describe how we created our video streamer using free software, older computers, and borrowed hardware. The system…

  7. Streaming video - præsentation af trailere over internettet

    DEFF Research Database (Denmark)

    Jensen, Ole Riis; Forchhammer, Søren

    1998-01-01

    Som et led i Tele Danmark Kabel TV's markedsføring ønsker man at kunne præsentere filmtrailere og andet materiale i form af levende billeder til kunderne via Wold Wide Web (WWW). Dette projekts hovedformål er at undersøge eksisterende metoder og udvikle redskaber til at præsentere en tilsvarende ...... interaktiv tjeneste baseret på realtidsfremvisning af videotrailere, såkaldt streaming video og audio, og hvor brugeren kan få information om en film der tænkes udbudt på en pay-per-view kanal. Der i arbejdets forløb blevet opbygget en demo, der implementerer en sådan tjeneste....

  8. Applicability of Existing Objective Metrics of Perceptual Quality for Adaptive Video Streaming

    DEFF Research Database (Denmark)

    Søgaard, Jacob; Krasula, Lukás; Shahid, Muhammad

    2016-01-01

    Objective video quality metrics are designed to estimate the quality of experience of the end user. However, these objective metrics are usually validated with video streams degraded under common distortion types. In the presented work, we analyze the performance of published and known full......-reference and noreference quality metrics in estimating the perceived quality of adaptive bit-rate video streams knowingly out of scope. Experimental results indicate not surprisingly that state of the art objective quality metrics overlook the perceived degradations in the adaptive video streams and perform poorly...... in estimating the subjective quality results....

  9. On subjective quality assessment of adaptive video streaming via crowdsourcing and laboratory based experiments

    DEFF Research Database (Denmark)

    Søgaard, Jacob; Shahid, Muhammad; Pokhrel, Jeevan

    2017-01-01

    Video streaming services are offered over the Internet and since the service providers do not have full control over the network conditions all the way to the end user, streaming technologies have been developed to maintain the quality of service in these varying network conditions i.e. so called...... adaptive video streaming. In order to cater for users' Quality of Experience (QoE) requirements, HTTP based adaptive streaming solutions of video services have become popular. However, the keys to ensure the users a good QoE with this technology is still not completely understood. User QoE feedback...

  10. A Stream Tapping Protocol Involving Clients in the Distribution of Videos on Demand

    Directory of Open Access Journals (Sweden)

    Santosh Kulkarni

    2008-01-01

    Full Text Available We present a stream tapping protocol that involves clients in the video distribution process. As in conventional stream tapping, our protocol allows new clients to tap the most recent broadcast of the video they are watching. While conventional stream tapping required the server to send to these clients the part of the video they missed, our protocol delegates this task to the clients that are already watching the video, thus greatly reducing the workload of the server. Unlike previous solutions involving clients in the video distribution process, our protocol works with clients that can only upload video data at a fraction of the video consumption rate and includes a mechanism to control its network bandwidth consumption.

  11. Analisis Kualitas Layanan Video Live Streaming pada Jaringan Lokal Universitas Telkom

    Directory of Open Access Journals (Sweden)

    Anggelina I Diwi

    2014-09-01

    Full Text Available Streaming adalah salah satu bentuk teknologi yang memperkenankan file digunakan secara langsung tanpa menunggu selesainya unggahan (download dan berlangsung secara kontinyu tanpa interupsi. Untuk mengaplikasikan video streaming kedalam jaringan, diperlukan pertama-tama untuk mengkalkulasi bandwidth yang tersedia, untuk mendukung transmisi data. Bandwidth merupakan parameter penting untuk streaming di dalam jaringan. Makin besar bandwidth yang tersedia, makin baik kualitas video yang ditampilkan. Penelitian ini bertujuan untuk mengetahui kebutuhan bandwidth untuk layanan video live streaming; metode yang digunakan di dalam penelitian ini adalah dengan mengadakan pengukuran unjuk kerja jaringan secara langsung di lapangan, yaitu LAN di lingkungan Universitas Telkom. Implementasi media streaming server-client di dalam penelitian ini menggunakan file video yang berbeda, berdasarkan jumlah frame yang dikirim (fps. Skenario video streaming ini dilakukan dengan menggunakan latar belakang  trafik  yang  bervariasi,  untuk  melihat  pengaruhnya terhadap parameter QoS jaringan. Pengujian performansi Quality of Service (QoS dalam implementasi video live streaming ini menggunakan software network analyzer Wireshark. Hasil penilitian menunjukkan, bahwa video dengan laju frame lebih besar dari 15 fps, memberikan jitter dan throughput yang besar pula.

  12. 4kUHD H264 Wireless Live Video Streaming Using CUDA

    Directory of Open Access Journals (Sweden)

    A. O. Adeyemi-Ejeye

    2014-01-01

    Full Text Available Ultrahigh definition video streaming has been explored in recent years. Most recently the possibility of 4kUHD video streaming over wireless 802.11n was presented, using preencoded video. Live encoding for streaming using x264 has proven to be very slow. The use of parallel encoding has been explored to speed up the process using CUDA. However there hasnot been a parallel implementation for video streaming. We therefore present for the first time a novel implementation of 4kUHD live encoding for streaming over a wireless network at low bitrate indoors, using CUDA for parallel H264 encoding. Our experimental results are used to verify our claim.

  13. Visual saliency in MPEG-4 AVC video stream

    Science.gov (United States)

    Ammar, M.; Mitrea, M.; Hasnaoui, M.; Le Callet, P.

    2015-03-01

    Visual saliency maps already proved their efficiency in a large variety of image/video communication application fields, covering from selective compression and channel coding to watermarking. Such saliency maps are generally based on different visual characteristics (like color, intensity, orientation, motion,…) computed from the pixel representation of the visual content. This paper resumes and extends our previous work devoted to the definition of a saliency map solely extracted from the MPEG-4 AVC stream syntax elements. The MPEG-4 AVC saliency map thus defined is a fusion of static and dynamic map. The static saliency map is in its turn a combination of intensity, color and orientation features maps. Despite the particular way in which all these elementary maps are computed, the fusion techniques allowing their combination plays a critical role in the final result and makes the object of the proposed study. A total of 48 fusion formulas (6 for combining static features and, for each of them, 8 to combine static to dynamic features) are investigated. The performances of the obtained maps are evaluated on a public database organized at IRCCyN, by computing two objective metrics: the Kullback-Leibler divergence and the area under curve.

  14. Collaborative tools and videoconferencing at CERN

    CERN Multimedia

    2008-01-01

    Are you wondering about the intricacies of using videoconferencing and other collaborative tools at CERN? Our two new courses might just be the answer! In April 2008 the venerable VRVS service was shut down and replaced by EVO. EVO is a Java-based, cross-platform collaborative tool which allows you to hold meetings from your office or from a CERN video conference room. Because of ever-increasing usage of EVO at CERN, IT-UDS-AVC is organizing an introductory EVO course entitled "A hands-on overview of EVO", which will cover the basic usage of EVO (hardware recommendations; booking meetings; joining an EVO meeting from a CERN conference room/office/phone; moderating meetings). This course will be held as a hands-on session in the training centre, and mainly targets meeting conveners and users who want to join meetings from their office. We also organize a course entitled "Videoconferencing and collaborative tools at CERN", which is a general introduction to the videoconferenc...

  15. Optimal PET protection for streaming scalably compressed video streams with limited retransmission based on incomplete feedback.

    Science.gov (United States)

    Xiong, Ruiqin; Taubman, David; Sivaraman, Vijay

    2010-09-01

    For streaming scalably compressed video streams over unreliable networks, Limited-Retransmission Priority Encoding Transmission (LR-PET) outperforms PET remarkably since the opportunity to retransmit is fully exploited by hypothesizing the possible future retransmission behavior before the retransmission really occurs. For the retransmission to be efficient in such a scheme, it is critical to get adequate acknowledgment from a previous transmission before deciding what data to retransmit. However, in many scenarios, the presence of a stochastic packet delay process results in frequent late acknowledgements, while imperfect feedback channels can impair the server's knowledge of what the client has received. This paper proposes an extended LR-PET scheme, which optimizes PET-protection of transmitted bitstreams, recognizing that the received feedback information is likely to be incomplete. Similar to the original LR-PET, the behavior of future retransmissions is hypothesized in the optimization objective of each transmission opportunity. As the key contribution, we develop a method to efficiently derive the effective recovery probability versus redundancy rate characteristic for the extended LR-PET communication process. This significantly simplifies the ultimate protection assignment procedure. This paper also demonstrates the advantage of the proposed strategy over several alternative strategies.

  16. Evaluation of MPEG-4 video streaming over UMTS/WCDMA dedicated channels

    NARCIS (Netherlands)

    Lo, Anthony; Heijenk, Geert; Niemegeers, I.G.M.M.

    2005-01-01

    Universal Mobile Telecommunications System (UMTS) is a third-generation mobile communication system that supports wireless wideband multimedia communications. This paper investigates the performance of streaming MPEG-4 video over UMTS dedicated channels with varying channel conditions. In order to

  17. Enhancing the quality of service of video streaming over MANETs using MDC and FEC

    Science.gov (United States)

    Zang, Weihua; Guo, Rui

    2012-04-01

    Path and server diversities have been used to guarantee reliable video streaming communication over wireless networks. In this paper, server diversity over mobile wireless ad hoc networks (MANETs) is implemented. Particularly, multipoint-to-point transmission together with multiple description coding (MDC) and forward error correction (FEC) technique is used to enhance the quality of service of video streaming over the wireless lossy networks. Additionally, the dynamic source routing (DSR) protocol is used to discover maximally disjoint routes for each sender and to distribute the workload evenly within the MANETs for video streaming applications. NS-2 Simulation study demonstrates the feasibility of the proposed mechanism and it shows that the approach achieves better quality of video streaming, in terms of the playable frame rate, reliability and real-time performance on the receiving side.

  18. Using Learning Styles and Viewing Styles in Streaming Video

    Science.gov (United States)

    de Boer, Jelle; Kommers, Piet A. M.; de Brock, Bert

    2011-01-01

    Improving the effectiveness of learning when students observe video lectures becomes urgent with the rising advent of (web-based) video materials. Vital questions are how students differ in their learning preferences and what patterns in viewing video can be detected in log files. Our experiments inventory students' viewing patterns while watching…

  19. Using learning styles and viewing styles in streaming video

    NARCIS (Netherlands)

    de Boer, Jelle; Kommers, Petrus A.M.; de Brock, Bert

    2011-01-01

    Improving the effectiveness of learning when students observe video lectures becomes urgent with the rising advent of (web-based) video materials. Vital questions are how students differ in their learning preferences and what patterns in viewing video can be detected in log files. Our experiments

  20. Stream On: Video Servers in the Real World.

    Science.gov (United States)

    Tristram, Claire

    1995-01-01

    Despite plans for corporate training networks, digital ad-insertion systems, hotel video-on-demand, and interactive television, only small scale video networks presently work. Four case studies examine the design and implementation decisions for different markets: corporate; advertising; hotel; and commercial video via cable, satellite or…

  1. Using learning styles and viewing styles in streaming video

    NARCIS (Netherlands)

    de Boer, Jelle; Kommers, Piet A. M.; de Brock, Bert

    Improving the effectiveness of learning when students observe video lectures becomes urgent with the rising advent of (web-based) video materials. Vital questions are how students differ in their learning preferences and what patterns in viewing video can be detected in log files. Our experiments

  2. Effect of embedded streaming video strategy in an online learning environment on the learning of neuroscience

    Science.gov (United States)

    Tantrarungroj, Pornsook

    The purpose of this study was to investigate the effectiveness of the embedded streaming video strategy in an online learning environment on declarative knowledge learning of neuroscience. The design used in this study was the posttest-only control-group design. A sample of 92 undergraduate students from a Midwestern university was recruited for the study. The students in the experimental group received online text-based instruction with static graphics and embedded streaming video, while the control group received the online text-based instruction with static graphics. No significant difference in students' immediate learning performance was found as measured by the content-related immediate posttest; however, a significant difference was found in students' knowledge retention as measured by the content-related retention posttest. The student' perception of the effectiveness of streaming video according to gender was also administered by the web-form survey. No significant gender difference was found to exist in students' perceptions toward the effectiveness of embedded streaming video. Results of the web-form survey of respondents' attitude regarding the effectiveness of streaming video are also presented. Adding streaming video to the online learning environment is recommended as one way to increase student learning performance.

  3. The effectiveness of streaming video on medical student learning: a case study.

    Science.gov (United States)

    Bridge, Patrick D; Jackson, Matt; Robinson, Leah

    2009-08-19

    Information technology helps meet today's medical students' needs by providing multiple curriculum delivery methods. Video streaming is an e-learning technology that uses the Internet to deliver curriculum while giving the student control of the content's delivery. There have been few studies conducted on the effectiveness of streaming video in medical schools. A 5-year retrospective study was conducted using three groups of students (n = 1736) to determine if the availability of streaming video in Years 1-2 of the basic science curriculum affected overall Step 1 scores for first-time test-takers. The results demonstrated a positive effect on program outcomes as streaming video became more readily available to students. Based on these findings, streaming video technology seems to be a viable tool to complement in-class delivery methods, to accommodate the needs of medical students, and to provide options for meeting the challenges of delivering the undergraduate medical curriculum. Further studies need to be conducted to continue validating the effectiveness of streaming video technology.

  4. Energy saving approaches for video streaming on smartphone based on QoE modeling

    DEFF Research Database (Denmark)

    Ballesteros, Luis Guillermo Martinez; Ickin, Selim; Fiedler, Markus

    2016-01-01

    In this paper, we study the influence of video stalling on QoE. We provide QoE models that are obtained in realistic scenarios on the smartphone, and provide energy-saving approaches for smartphone by leveraging the proposed QoE models in relation to energy. Results show that approximately 5J...... is saved in a 3 minutes video clip with an acceptable Mean Opinion Score (MOS) level when the video frames are skipped. If the video frames are not skipped, then it is suggested to avoid freezes during a video stream as the freezes highly increase the energy waste on the smartphones....

  5. Performance Evaluation of Concurrent Multipath Video Streaming in Multihomed Mobile Networks

    Directory of Open Access Journals (Sweden)

    James Nightingale

    2013-01-01

    Full Text Available High-quality real-time video streaming to users in mobile networks is challenging due to the dynamically changing nature of the network paths, particularly the limited bandwidth and varying end-to-end delay. In this paper, we empirically investigate the performance of multipath streaming in the context of multihomed mobile networks. Existing schemes that make use of the aggregated bandwidth of multiple paths can overcome bandwidth limitations on a single path but suffer an efficiency penalty caused by retransmission of lost packets in reliable transport schemes or path switching overheads in unreliable transport schemes. This work focuses on the evaluation of schemes to permit concurrent use of multiple paths to deliver video streams. A comprehensive streaming framework for concurrent multipath video streaming is proposed and experimentally evaluated, using current state-of-the-art H.264 Scalable Video Coding (H.264/SVC and the next generation High Efficiency Video Coding (HEVC standards. It provides a valuable insight into the benefit of using such schemes in conjunction with encoder specific packet prioritisation mechanisms for quality-aware packet scheduling and scalable streaming. The remaining obstacles to deployment of concurrent multipath schemes are identified, and the challenges in realising HEVC based concurrent multipath streaming are highlighted.

  6. Real-time video streaming in mobile cloud over heterogeneous wireless networks

    Science.gov (United States)

    Abdallah-Saleh, Saleh; Wang, Qi; Grecos, Christos

    2012-06-01

    Recently, the concept of Mobile Cloud Computing (MCC) has been proposed to offload the resource requirements in computational capabilities, storage and security from mobile devices into the cloud. Internet video applications such as real-time streaming are expected to be ubiquitously deployed and supported over the cloud for mobile users, who typically encounter a range of wireless networks of diverse radio access technologies during their roaming. However, real-time video streaming for mobile cloud users across heterogeneous wireless networks presents multiple challenges. The network-layer quality of service (QoS) provision to support high-quality mobile video delivery in this demanding scenario remains an open research question, and this in turn affects the application-level visual quality and impedes mobile users' perceived quality of experience (QoE). In this paper, we devise a framework to support real-time video streaming in this new mobile video networking paradigm and evaluate the performance of the proposed framework empirically through a lab-based yet realistic testing platform. One particular issue we focus on is the effect of users' mobility on the QoS of video streaming over the cloud. We design and implement a hybrid platform comprising of a test-bed and an emulator, on which our concept of mobile cloud computing, video streaming and heterogeneous wireless networks are implemented and integrated to allow the testing of our framework. As representative heterogeneous wireless networks, the popular WLAN (Wi-Fi) and MAN (WiMAX) networks are incorporated in order to evaluate effects of handovers between these different radio access technologies. The H.264/AVC (Advanced Video Coding) standard is employed for real-time video streaming from a server to mobile users (client nodes) in the networks. Mobility support is introduced to enable continuous streaming experience for a mobile user across the heterogeneous wireless network. Real-time video stream packets

  7. Accessing and Engaging with Video Streams for Educational Purposes: Experiences, Issues and Concerns

    Science.gov (United States)

    Bracher, Maggie; Collier, Richard; Ottewill, Roger; Shephard, Kerry

    2005-01-01

    Video streaming has the potential to offer tutors a more flexible and accessible means of incorporating moving images into learning resources for their students than conventional video. Consideration is given to this assertion by drawing upon the experiences of staff and evidence from students at the University of Southampton in the use of a…

  8. A Scalable Multimedia Streaming Scheme with CBR-Transmission of VBR-Encoded Videos over the Internet

    Science.gov (United States)

    Kabir, Md. H.; Shoja, Gholamali C.; Manning, Eric G.

    2006-01-01

    Streaming audio/video contents over the Internet requires large network bandwidth and timely delivery of media data. A streaming session is generally long and also needs a large I/O bandwidth at the streaming server. A streaming server, however, has limited network and I/O bandwidth. For this reason, a streaming server alone cannot scale a…

  9. An analysis of technology usage for streaming digital video in support of a preclinical curriculum.

    Science.gov (United States)

    Dev, P; Rindfleisch, T C; Kush, S J; Stringer, J R

    2000-01-01

    Usage of streaming digital video of lectures in preclinical courses was measured by analysis of the data in the log file maintained on the web server. We observed that students use the video when it is available. They do not use it to replace classroom attendance but rather for review before examinations or when a class has been missed. Usage of video has not increased significantly for any course within the 18 month duration of this project.

  10. Impact of the LTE scheduler on achieving good QoE for DASH video streaming

    OpenAIRE

    Zahran, Ahmed H.; Quinlan, Jason J.; Ramakrishnan, K. K.; Sreenan, Cormac J.

    2016-01-01

    Dynamic adaptive video over HTTP (DASH) is fast becoming the protocol of choice for content providers for their online video streaming delivery. Concurrently, dependence on cellular Long Term Evolution (LTE) networks is growing to serve user demands for bandwidth-hungry applications, especially video. Each LTE base station's (eNodeB) scheduler assigns wireless resources to individual clients. Several alternative schedulers have been proposed, especially to meet the user's desired quality of e...

  11. Subjective evaluation of H.265/HEVC based dynamic adaptive video streaming over HTTP (HEVC-DASH)

    Science.gov (United States)

    Irondi, Iheanyi; Wang, Qi; Grecos, Christos

    2015-02-01

    The Dynamic Adaptive Streaming over HTTP (DASH) standard is becoming increasingly popular for real-time adaptive HTTP streaming of internet video in response to unstable network conditions. Integration of DASH streaming techniques with the new H.265/HEVC video coding standard is a promising area of research. The performance of HEVC-DASH systems has been previously evaluated by a few researchers using objective metrics, however subjective evaluation would provide a better measure of the user's Quality of Experience (QoE) and overall performance of the system. This paper presents a subjective evaluation of an HEVC-DASH system implemented in a hardware testbed. Previous studies in this area have focused on using the current H.264/AVC (Advanced Video Coding) or H.264/SVC (Scalable Video Coding) codecs and moreover, there has been no established standard test procedure for the subjective evaluation of DASH adaptive streaming. In this paper, we define a test plan for HEVC-DASH with a carefully justified data set employing longer video sequences that would be sufficient to demonstrate the bitrate switching operations in response to various network condition patterns. We evaluate the end user's real-time QoE online by investigating the perceived impact of delay, different packet loss rates, fluctuating bandwidth, and the perceived quality of using different DASH video stream segment sizes on a video streaming session using different video sequences. The Mean Opinion Score (MOS) results give an insight into the performance of the system and expectation of the users. The results from this study show the impact of different network impairments and different video segments on users' QoE and further analysis and study may help in optimizing system performance.

  12. A Pre-Scheduling Mechanism in LTE Handover for Streaming Video

    Directory of Open Access Journals (Sweden)

    Wei-Kuang Lai

    2016-03-01

    Full Text Available This paper focuses on downlink packet scheduling for streaming video in Long Term Evolution (LTE. As a hard handover is adopted in LTE and has the period of breaking connection, it may cause a low user-perceived video quality. Therefore, we propose a handover prediction mechanism and a pre-scheduling mechanism to dynamically adjust the data rates of transmissions for providing a high quality of service (QoS for streaming video before new connection establishment. Advantages of our method in comparison to the exponential/proportional fair (EXP/PF scheme are shown through simulation experiments.

  13. A BitTorrent-Based Dynamic Bandwidth Adaptation Algorithm for Video Streaming

    Science.gov (United States)

    Hsu, Tz-Heng; Liang, You-Sheng; Chiang, Meng-Shu

    In this paper, we propose a BitTorrent-based dynamic bandwidth adaptation algorithm for video streaming. Two mechanisms to improve the original BitTorrent protocol are proposed: (1) the decoding order frame first (DOFF) frame selection algorithm and (2) the rarest I frame first (RIFF) frame selection algorithm. With the proposed algorithms, a peer can periodically check the number of downloaded frames in the buffer and then allocate the available bandwidth adaptively for video streaming. As a result, users can have smooth video playout experience with the proposed algorithms.

  14. Videoconferencing in Math and Science Preservice Elementary Teachers' Field Placements

    Science.gov (United States)

    Plonczak, Irene

    2010-03-01

    This study was designed to examine benefits and challenges of teaching through videoconferencing in the context of students’ field placement experiences, particularly as it relates to an inquiry-based approach to teaching and learning math and science. In the context of mathematics and science methods courses, preservice teachers, with the supervision of professors, field placement supervisors and cooperating teachers, taught a series of math and science lessons via video conferencing to 5th grade classes in a major urban public school. Two major results of this study indicate that: (1) teaching through videoconferencing highlights strengths and weaknesses in questioning skill techniques that are at the heart of an inquiry-based approach; (2) teaching through videoconferencing raises the intellectual challenge of teaching and allows preservice teachers to look face to face into their limited understanding of the content matter in math and science.

  15. Distortion Optimized Packet Scheduling and Prioritization of Multiple Video Streams over 802.11e Networks

    Directory of Open Access Journals (Sweden)

    Ilias Politis

    2007-01-01

    Full Text Available This paper presents a generic framework solution for minimizing video distortion of all multiple video streams transmitted over 802.11e wireless networks, including intelligent packet scheduling and channel access differentiation mechanisms. A distortion prediction model designed to capture the multireferenced frame coding characteristic of H.264/AVC encoded videos is used to predetermine the distortion importance of each video packet in all streams. Two intelligent scheduling algorithms are proposed: the “even-loss distribution,” where each video sender is experiencing the same loss and the “greedy-loss distribution” packet scheduling, where selected packets are dropped over all streams, ensuring that the most significant video stream in terms of picture context and quality characteristics will experience minimum losses. The proposed model has been verified with actual distortion measurements and has been found more accurate than the “additive distortion” model that omits the correlation among lost frames. The paper includes analytical and simulation results from the comparison of both schemes and from their comparison to the simplified additive model, for different video sequences and channel conditions.

  16. Fine-Grained Rate Shaping for Video Streaming over Wireless Networks

    Directory of Open Access Journals (Sweden)

    Chen Tsuhan

    2004-01-01

    Full Text Available Video streaming over wireless networks faces challenges of time-varying packet loss rate and fluctuating bandwidth. In this paper, we focus on streaming precoded video that is both source and channel coded. Dynamic rate shaping has been proposed to “shape” the precompressed video to adapt to the fluctuating bandwidth. In our earlier work, rate shaping was extended to shape the channel coded precompressed video, and to take into account the time-varying packet loss rate as well as the fluctuating bandwidth of the wireless networks. However, prior work on rate shaping can only adjust the rate oarsely. In this paper, we propose “fine-grained rate shaping (FGRS” to allow for bandwidth adaptation over a wide range of bandwidth and packet loss rate in fine granularities. The video is precoded with fine granularity scalability (FGS followed by channel coding. Utilizing the fine granularity property of FGS and channel coding, FGRS selectively drops part of the precoded video and still yields decodable bit-stream at the decoder. Moreover, FGRS optimizes video streaming rather than achieves heuristic objectives as conventional methods. A two-stage rate-distortion (RD optimization algorithm is proposed for FGRS. Promising results of FGRS are shown.

  17. Scalable Video Streaming Relay for Smart Mobile Devices in Wireless Networks.

    Science.gov (United States)

    Kwon, Dongwoo; Je, Huigwang; Kim, Hyeonwoo; Ju, Hongtaek; An, Donghyeok

    2016-01-01

    Recently, smart mobile devices and wireless communication technologies such as WiFi, third generation (3G), and long-term evolution (LTE) have been rapidly deployed. Many smart mobile device users can access the Internet wirelessly, which has increased mobile traffic. In 2014, more than half of the mobile traffic around the world was devoted to satisfying the increased demand for the video streaming. In this paper, we propose a scalable video streaming relay scheme. Because many collisions degrade the scalability of video streaming, we first separate networks to prevent excessive contention between devices. In addition, the member device controls the video download rate in order to adapt to video playback. If the data are sufficiently buffered, the member device stops the download. If not, it requests additional video data. We implemented apps to evaluate the proposed scheme and conducted experiments with smart mobile devices. The results showed that our scheme improves the scalability of video streaming in a wireless local area network (WLAN).

  18. User-adaptive mobile video streaming using MPEG-DASH

    Science.gov (United States)

    Reznik, Yuriy A.

    2013-09-01

    We describe an implementation of DASH streaming client for mobile devices which uses adaptation to user behavior and viewing conditions as means for improving efficiency of streaming delivery. Proposed design relies on sensors in a mobile device to detect presence of the user, his proximity to the screen, and other factors such as motion, brightness of the screen and ambient lighting conditions. This information is subsequently used to select stream that delivers adequate resolution implied by viewing conditions and natural limits of human vision. We show that in a mobile environment such adaptation can result in significant reduction of bandwidth usage compared to traditional streaming systems.

  19. Uncoordinated Multi-user Video Streaming in VANETs using Skype

    DEFF Research Database (Denmark)

    Belyaev, Evgeny; Moreschini, Sergio; Vinel, Alexey

    2017-01-01

    Real-time video delivery in Vehicle-to-Infrastructure (V2I) scenario enables a variety of multimedia vehicular services. We conduct experiments with Dedicated Short Range Communications (DSRC) transceivers located in the mutual proximity and exchanging Skype video calls traffic. We demonstrate...

  20. A multichannel multi-encoding transmission scheme for wireless video streaming

    Science.gov (United States)

    Kolekar, Abhijeet; Feng, Wuchi; Venkatachalam, Muthaiah

    2007-01-01

    The wireless industry has seen a surge of interest in upcoming broadband wireless access (BWA) networks like WiMAX that are based on orthogonal frequency division multiplexing (OFDM). These wireless access technologies have several key features such as centralized scheduling, fine-grained allocation of transmission slots, adaptation of the modulation and coding schemes (MCS) to the SNR variations of the wireless channel, flexible and connection oriented MAC layer as well as QoS awareness and differentiation for applications. As a result, such architectures provide new opportunities for cross-layer optimization, particularly for applications that can tolerate some bit errors. In this paper, we describe a multi-channel video streaming protocol for video streaming over such networks. In addition, we propose a new combined channel coding and proportional share allocation scheme for multicast video distribution based upon a video's popularity. Our results show that we can more efficiently allocate network bandwidth while providing high quality video to the application.

  1. For Video Streaming/Delivery: Is HTML5 the Real Fix?

    Directory of Open Access Journals (Sweden)

    John Millard

    2013-10-01

    Full Text Available The general movement towards streaming or playing videos on the web has grown exponentially in the last decade. The combination of new streaming technologies and faster Internet connections continue to provide enhanced and robust user experience for video content. For many organizations, adding videos on their websites has transitioned from a “cool” feature to a mission critical service. Some of the benefits in putting videos online include: to engage and convert visitors, to raise awareness or drive interest, to share inspirational stories or recent unique events, etc. Along with the growth in the use and need for video content on the web; delivering videos online also remains a messy activity for developers and web teams. Examples of existing challenges include creating more accessible videos with captions and delivering content (using adaptive streaming for the diverse range of mobile and tablet devices. In this article, we report on the decision-making and early results in using the Kaltura video platform in two popular library platforms: CONTENTdm and DSpace.

  2. SVC VIDEO STREAM ALLOCATION AND ADAPTATION IN HETEROGENEOUS NETWORK

    Directory of Open Access Journals (Sweden)

    E. A. Pakulova

    2016-07-01

    Full Text Available The paper deals with video data transmission in format H.264/SVC standard with QoS requirements satisfaction. The Sender-Side Path Scheduling (SSPS algorithm and Sender-Side Video Adaptation (SSVA algorithm were developed. SSPS algorithm gives the possibility to allocate video traffic among several interfaces while SSVA algorithm dynamically changes the quality of video sequence in relation to QoS requirements. It was shown that common usage of two developed algorithms enables to aggregate throughput of access networks, increase parameters of Quality of Experience and decrease losses in comparison with Round Robin algorithm. For evaluation of proposed solution, the set-up was made. The trace files with throughput of existing public networks were used in experiments. Based on this information the throughputs of networks were limited and losses for paths were set. The results of research may be used for study and transmission of video data in heterogeneous wireless networks.

  3. A novel ingress node design for video streaming over optical burst switching networks.

    Science.gov (United States)

    Askar, S; Zervas, G; Hunter, D K; Simeonidou, D

    2011-12-12

    This paper introduces a novel ingress node design which takes advantage of video data partitioning in order to deliver enhanced video streaming quality when using H.264/AVC codec over optical burst switching networks. Ns2 simulations show that the proposed scheme delivers improved video traffic quality without affecting other traffic, such as best effort traffic. Although the extra network load is comparatively small, the average gain in video PSNR was 5 dB over existing burst cloning schemes, with a maximum end-to-end delay of 17 ms, and jitter of less than 0.35 ms. © 2011 Optical Society of America

  4. An Introduction to Recording, Editing, and Streaming Picture-in-Picture Ultrasound Videos.

    Science.gov (United States)

    Rajasekaran, Sathish; Hall, Mederic M; Finnoff, Jonathan T

    2016-08-01

    This paper describes the process by which high-definition resolution (up to 1920 × 1080 pixels) ultrasound video can be captured in conjunction with high-definition video of the transducer position (picture-in-picture). In addition, we describe how to edit the recorded video feeds to combine both feeds, and to crop, resize, split, stitch, cut, annotate videos, and also change the frame rate, insert pictures, edit the audio feed, and use chroma keying. We also describe how to stream a picture-in-picture ultrasound feed during a videoconference. Copyright © 2016 American Academy of Physical Medicine and Rehabilitation. Published by Elsevier Inc. All rights reserved.

  5. Proxy-assisted multicasting of video streams over mobile wireless networks

    Science.gov (United States)

    Nguyen, Maggie; Pezeshkmehr, Layla; Moh, Melody

    2005-03-01

    This work addresses the challenge of providing seamless multimedia services to mobile users by proposing a proxy-assisted multicast architecture for delivery of video streams. We propose a hybrid system of streaming proxies, interconnected by an application-layer multicast tree, where each proxy acts as a cluster head to stream out content to its stationary and mobile users. The architecture is based on our previously proposed Enhanced-NICE protocol, which uses an application-layer multicast tree to deliver layered video streams to multiple heterogeneous receivers. We targeted the study on placements of streaming proxies to enable efficient delivery of live and on-demand video, supporting both stationary and mobile users. The simulation results are evaluated and compared with two other baseline scenarios: one with a centralized proxy system serving the entire population and one with mini-proxies each to serve its local users. The simulations are implemented using the J-SIM simulator. The results show that even though proxies in the hybrid scenario experienced a slightly longer delay, they had the lowest drop rate of video content. This finding illustrates the significance of task sharing in multiple proxies. The resulted load balancing among proxies has provided a better video quality delivered to a larger audience.

  6. Two-Stream Transformer Networks for Video-based Face Alignment.

    Science.gov (United States)

    Liu, Hao; Lu, Jiwen; Feng, Jianjiang; Zhou, Jie

    2017-08-01

    In this paper, we propose a two-stream transformer networks (TSTN) approach for video-based face alignment. Unlike conventional image-based face alignment approaches which cannot explicitly model the temporal dependency in videos and motivated by the fact that consistent movements of facial landmarks usually occur across consecutive frames, our TSTN aims to capture the complementary information of both the spatial appearance on still frames and the temporal consistency information across frames. To achieve this, we develop a two-stream architecture, which decomposes the video-based face alignment into spatial and temporal streams accordingly. Specifically, the spatial stream aims to transform the facial image to the landmark positions by preserving the holistic facial shape structure. Accordingly, the temporal stream encodes the video input as active appearance codes, where the temporal consistency information across frames is captured to help shape refinements. Experimental results on the benchmarking video-based face alignment datasets show very competitive performance of our method in comparisons to the state-of-the-arts.

  7. Quality-aware Content Adaptation in Digital Video Streaming

    OpenAIRE

    Wilk, Stefan

    2016-01-01

    User-generated video has attracted a lot of attention due to the success of Video Sharing Sites such as YouTube and Online Social Networks. Recently, a shift towards live consumption of these videos is observable. The content is captured and instantly shared over the Internet using smart mobile devices such as smartphones. Large-scale platforms arise such as YouTube.Live, YouNow or Facebook.Live which enable the smartphones of users to livestream to the public. These platforms achieve the dis...

  8. Modeling the time--varying subjective quality of HTTP video streams with rate adaptations.

    Science.gov (United States)

    Chen, Chao; Choi, Lark Kwon; de Veciana, Gustavo; Caramanis, Constantine; Heath, Robert W; Bovik, Alan C

    2014-05-01

    Newly developed hypertext transfer protocol (HTTP)-based video streaming technologies enable flexible rate-adaptation under varying channel conditions. Accurately predicting the users' quality of experience (QoE) for rate-adaptive HTTP video streams is thus critical to achieve efficiency. An important aspect of understanding and modeling QoE is predicting the up-to-the-moment subjective quality of a video as it is played, which is difficult due to hysteresis effects and nonlinearities in human behavioral responses. This paper presents a Hammerstein-Wiener model for predicting the time-varying subjective quality (TVSQ) of rate-adaptive videos. To collect data for model parameterization and validation, a database of longer duration videos with time-varying distortions was built and the TVSQs of the videos were measured in a large-scale subjective study. The proposed method is able to reliably predict the TVSQ of rate adaptive videos. Since the Hammerstein-Wiener model has a very simple structure, the proposed method is suitable for online TVSQ prediction in HTTP-based streaming.

  9. Dynamic Programming Optimization of Multi-rate Multicast Video-Streaming Services

    Directory of Open Access Journals (Sweden)

    Nestor Michael Caños Tiglao

    2010-06-01

    Full Text Available In large scale IP Television (IPTV and Mobile TV distributions, the video signal is typically encoded and transmitted using several quality streams, over IP Multicast channels, to several groups of receivers, which are classified in terms of their reception rate. As the number of video streams is usually constrained by both the number of TV channels and the maximum capacity of the content distribution network, it is necessary to find the selection of video stream transmission rates that maximizes the overall user satisfaction. In order to efficiently solve this problem, this paper proposes the Dynamic Programming Multi-rate Optimization (DPMO algorithm. The latter was comparatively evaluated considering several user distributions, featuring different access rate patterns. The experimental results reveal that DPMO is significantly more efficient than exhaustive search, while presenting slightly higher execution times than the non-optimal Multi-rate Step Search (MSS algorithm.

  10. A Complexity-Aware Video Adaptation Mechanism for Live Streaming Systems

    Directory of Open Access Journals (Sweden)

    Chen Homer H

    2007-01-01

    Full Text Available The paradigm shift of network design from performance-centric to constraint-centric has called for new signal processing techniques to deal with various aspects of resource-constrained communication and networking. In this paper, we consider the computational constraints of a multimedia communication system and propose a video adaptation mechanism for live video streaming of multiple channels. The video adaptation mechanism includes three salient features. First, it adjusts the computational resource of the streaming server block by block to provide a fine control of the encoding complexity. Second, as far as we know, it is the first mechanism to allocate the computational resource to multiple channels. Third, it utilizes a complexity-distortion model to determine the optimal coding parameter values to achieve global optimization. These techniques constitute the basic building blocks for a successful application of wireless and Internet video to digital home, surveillance, IPTV, and online games.

  11. Using the Periscope Live Video-Streaming Application for Global Pathology Education: A Brief Introduction.

    Science.gov (United States)

    Fuller, Maren Y; Mukhopadhyay, Sanjay; Gardner, Jerad M

    2016-07-21

    Periscope is a live video-streaming smartphone application (app) that allows any individual with a smartphone to broadcast live video simultaneously to multiple smartphone users around the world. The aim of this review is to describe the potential of this emerging technology for global pathology education. To our knowledge, since the launch of the Periscope app (2015), only a handful of educational presentations by pathologists have been streamed as live video via Periscope. This review includes links to these initial attempts, a step-by-step guide for those interested in using the app for pathology education, and a summary of the pros and cons, including ethical/legal issues. We hope that pathologists will appreciate the potential of Periscope for sharing their knowledge, expertise, and research with a live (and potentially large) audience without the barriers associated with traditional video equipment and standard classroom/conference settings.

  12. Content-Adaptive Packetization and Streaming of Wavelet Video over IP Networks

    Directory of Open Access Journals (Sweden)

    Chien-Peng Ho

    2007-03-01

    Full Text Available This paper presents a framework of content-adaptive packetization scheme for streaming of 3D wavelet-based video content over lossy IP networks. The tradeoff between rate and distortion is controlled by jointly adapting scalable source coding rate and level of forward error correction (FEC protection. A content dependent packetization mechanism with data-interleaving and Reed-Solomon protection for wavelet-based video codecs is proposed to provide unequal error protection. This paper also tries to answer an important question for scalable video streaming systems: given extra bandwidth, should one increase the level of channel protection for the most important packets, or transmit more scalable source data? Experimental results show that the proposed framework achieves good balance between quality of the received video and level of error protection under bandwidth-varying lossy IP networks.

  13. Content-Adaptive Packetization and Streaming of Wavelet Video over IP Networks

    Directory of Open Access Journals (Sweden)

    Ho Chien-Peng

    2007-01-01

    Full Text Available This paper presents a framework of content-adaptive packetization scheme for streaming of 3D wavelet-based video content over lossy IP networks. The tradeoff between rate and distortion is controlled by jointly adapting scalable source coding rate and level of forward error correction (FEC protection. A content dependent packetization mechanism with data-interleaving and Reed-Solomon protection for wavelet-based video codecs is proposed to provide unequal error protection. This paper also tries to answer an important question for scalable video streaming systems: given extra bandwidth, should one increase the level of channel protection for the most important packets, or transmit more scalable source data? Experimental results show that the proposed framework achieves good balance between quality of the received video and level of error protection under bandwidth-varying lossy IP networks.

  14. Error Protection of Wavelet Scalable Video Streaming Using Wyner-Ziv Technique over a Lossy Network

    Science.gov (United States)

    Liu, Benjian; Xu, Ke

    This paper presents a novel error resilience scheme for wavelet scalable video coding. We use Wyner-Ziv codec to produce extra bits protecting the important parts of the embedded video streaming. At the same time these bits also as the second description of important parts are transmitted over auxiliary channel to the receiver for error resilience. The errors in the embedded video streaming can be corrected by Wyner-Ziv description which regards the decoded frame as side information. Moreover, Wyner-Ziv decoder utilizes a coarse estimated version of the corrupted parts exploiting frame correlation in wavelet video decoder to generate a refine version. Simulation results show that our proposed method can achieve much better performance compared with Forward Error Correction code. Meanwhile, this error resilient algorithm can achieve 2-3 dB PSNR gains over the motion compensation error concealment.

  15. Adaptive Streaming of Scalable Videos over P2PTV

    Directory of Open Access Journals (Sweden)

    Youssef Lahbabi

    2015-01-01

    Full Text Available In this paper, we propose a new Scalable Video Coding (SVC quality-adaptive peer-to-peer television (P2PTV system executed at the peers and at the network. The quality adaptation mechanisms are developed as follows: on one hand, the Layer Level Initialization (LLI is used for adapting the video quality with the static resources at the peers in order to avoid long startup times. On the other hand, the Layer Level Adjustment (LLA is invoked periodically to adjust the SVC layer to the fluctuation of the network conditions with the aim of predicting the possible stalls before their occurrence. Our results demonstrate that our mechanisms allow quickly adapting the video quality to various system changes while providing best Quality of Experience (QoE that matches current resources of the peer devices and instantaneous throughput available at the network state.

  16. A cross-layer approach for wireless medical video streaming in robotic teleultrasonography.

    Science.gov (United States)

    Martini, Maria G; Istepanian, Robert S H; Mazzotti, Matteo; Philip, Nada

    2007-01-01

    M-health is an emerging area of research integrating emerging wireless technologies with healthcare systems. One of the key challenges in future research in this area, especially from the communications perspective, is medical video streaming over 3G and 4G systems. In this paper, video streaming in a robotic teleultrasonography system through a cross-layer approach based on tailor made controller structures is presented. Simulation results of the proposed system demonstrate the successful performance of the proposed controller structures in this advanced mobile telemedical environment.

  17. Reboot-based Recovery of Performance Anomalies in Adaptive Bitrate Video-Streaming Services

    OpenAIRE

    Cunha, Carlos Augusto da Silva; Silva, Luis M. e

    2015-01-01

    Performance anomalies represent one common type of failures in Internet servers. Overcoming these failures without introducing server downtimes is of the utmost importance in video-streaming services. These services have large user abandon- ment costs when failures occur after users watch a significant part of a video. Reboot is the most popular and effective technique for overcoming performance anomalies but it takes several minutes from start until the...

  18. Frame Rate Exclusive Sync Management of Live Video Streams in Collaborative Mobile Production Environment

    OpenAIRE

    Mughal, Mudassar Ahmad; Zoric, Goranka; Juhlin, Oskar

    2014-01-01

    We discuss synchronization problem in an emerging type of multimedia applications, called live mobile collaborative video production systems. The mobile character of the production system allows a director to be present at the site where he/she can see the event directly as well as through the mixer display. In such a situation production of a consistent broadcast is sensitive to delay and asynchrony of video streams in the mixer console. In this paper, we propose an algorithm for this situat...

  19. TAG: A tree-assisted gossip protocol for on-demand video streaming

    OpenAIRE

    Zhou, Ming

    2005-01-01

    While a tree topology is often advocated for overlay video streaming due to its scalability, it suffers from discontinuous playback under highly dynamic network environments. On the other hand, gossip protocols using random message dissemination, though robust, fail to meet the real-time constraints for streaming applications. In this master thesis, I proposed TAG, a Tree-Assisted Gossip protocol, which adopts a tree structure with time indexing to accommodate asynchronous requests, and an ef...

  20. Optimal Multi-Interface Selection for Mobile Video Streaming in Efficient Battery Consumption and Data Usage

    Directory of Open Access Journals (Sweden)

    Seonghoon Moon

    2016-01-01

    Full Text Available With the proliferation of high-performance, large-screen mobile devices, users’ expectations of having access to high-resolution video content in smooth network environments are steadily growing. To guarantee such stable streaming, a high cellular network bandwidth is required; yet network providers often charge high prices for even limited data plans. Moreover, the costs of smoothly streaming high-resolution videos are not merely monetary; the device’s battery life must also be accounted for. To resolve these problems, we design an optimal multi-interface selection system for streaming video over HTTP/TCP. An optimization problem including battery life and LTE data constraints is derived and then solved using binary integer programming. Additionally, the system is designed with an adoption of split-layer scalable video coding, which provides direct adaptations of video quality and prevents out-of-order packet delivery problems. The proposed system is evaluated using a prototype application in a real, iOS-based device as well as through experiments conducted in heterogeneous mobile scenarios. Results show that the system not only guarantees the highest-possible video quality, but also prevents reckless consumption of LTE data and battery life.

  1. Mobile Videoconferencing Apps for Telemedicine.

    Science.gov (United States)

    Zhang, Kai; Liu, Wei-Li; Locatis, Craig; Ackerman, Michael

    2016-01-01

    The quality and performance of several videoconferencing applications (apps) tested on iOS (Apple, Cupertino, CA) and Android (Google, Mountain View, CA) mobile platforms using Wi-Fi (802.11), third-generation (3G), and fourth-generation (4G) cellular networks are described. The tests were done to determine how well apps perform compared with videoconferencing software installed on computers or with more traditional videoconferencing using dedicated hardware. The rationale for app assessment and the testing methodology are described. Findings are discussed in relation to operating system platform (iOS or Android) for which the apps were designed and the type of network (Wi-Fi, 3G, or 4G) used. The platform, network, and apps interact, and it is impossible to discuss videoconferencing experienced on mobile devices in relation to one of these factors without referencing the others. Apps for mobile devices can vary significantly from other videoconferencing software or hardware. App performance increased over the testing period due to improvements in network infrastructure and how apps manage bandwidth.

  2. Streaming video to enhance students’ reflection in dance education

    NARCIS (Netherlands)

    Leijen, A.; Lam, I.; Wildschut, L.; Simons, P.R.J.; Admiraal, W.

    2009-01-01

    This paper presents an evaluation case study that describes the experiences of 15 students and 2 teachers using a video-based learning environment, DiViDU, to facilitate students’ daily reflection activities in a composition course and a ballet course. To support dance students’ reflection processes

  3. A time-varying subjective quality model for mobile streaming videos with stalling events

    Science.gov (United States)

    Ghadiyaram, Deepti; Pan, Janice; Bovik, Alan C.

    2015-09-01

    Over-the-top mobile video streaming is invariably influenced by volatile network conditions which cause playback interruptions (stalling events), thereby impairing users' quality of experience (QoE). Developing models that can accurately predict users' QoE could enable the more efficient design of quality-control protocols for video streaming networks that reduce network operational costs while still delivering high-quality video content to the customers. Existing objective models that predict QoE are based on global video features, such as the number of stall events and their lengths, and are trained and validated on a small pool of ad hoc video datasets, most of which are not publicly available. The model we propose in this work goes beyond previous models as it also accounts for the fundamental effect that a viewer's recent level of satisfaction or dissatisfaction has on their overall viewing experience. In other words, the proposed model accounts for and adapts to the recency, or hysteresis effect caused by a stall event in addition to accounting for the lengths, frequency of occurrence, and the positions of stall events - factors that interact in a complex way to affect a user's QoE. On the recently introduced LIVE-Avvasi Mobile Video Database, which consists of 180 distorted videos of varied content that are afflicted solely with over 25 unique realistic stalling events, we trained and validated our model to accurately predict the QoE, attaining standout QoE prediction performance.

  4. Low Delay Video Streaming on the Internet of Things Using Raspberry Pi

    Directory of Open Access Journals (Sweden)

    Ulf Jennehag

    2016-09-01

    Full Text Available The Internet of Things is predicted to consist of over 50 billion devices aiming to solve problems in most areas of our digital society. A large part of the data communicated is expected to consist of various multimedia contents, such as live audio and video. This article presents a solution for the communication of high definition video in low-delay scenarios (<200 ms under the constraints of devices with limited hardware resources, such as the Raspberry Pi. We verify that it is possible to enable low delay video streaming between Raspberry Pi devices using a distributed Internet of Things system called the SensibleThings platform. Specifically, our implementation transfers a 6 Mbps H.264 video stream of 1280 × 720 pixels at 25 frames per second between devices with a total delay of 181 ms on the public Internet, of which the overhead of the distributed Internet of Things communication platform only accounts for 18 ms of this delay. We have found that the most significant bottleneck of video transfer on limited Internet of Things devices is the video coding and not the distributed communication platform, since the video coding accounts for 90% of the total delay.

  5. Understanding the Perceptions of Network Gatekeepers on Bandwidth and Online Video Streams in Ahmadu Bello University, Nigeria

    Science.gov (United States)

    Odigie, Imoisili Ojeime; Gbaje, Ezra Shiloba

    2017-01-01

    Online video streaming is a learning technology used in today's world and reliant on the availability of bandwidth. This research study sought to understand the perceptions of network gatekeepers about bandwidth and online video streams in Ahmadu Bello University, Nigeria. To achieve this, the interpretive paradigm and the Network Gatekeeping…

  6. Guest Editorial: Analysis and Retrieval of Events/Actions and Workflows in Video Streams

    DEFF Research Database (Denmark)

    Doulamis, Anastasios; Doulamis, Nikolaos; Bertini, Marco

    2016-01-01

    Cognitive video supervision and event analysis in video sequences is a critical task in many multimedia applications. Methods, tools, and algorithms that aim to detect and recognize high-level concepts and their respective spatiotemporal and causal relations in order to identify semantic video...... activities, actions, and procedures have been in the focus of the research community over the last years. This research area has strong impact on many real-life applications such as service quality assurance, compliance to the designed procedures in industrial plants, surveillance of people-dense areas (e.......g., thematic parks, critical public infrastructures), crisis management in public service areas (e.g., train stations, airports), security (detection of abnormal behaviors in surveillance videos), semantic characterization, and annotation of video streams in various domains (e.g., broadcast or user...

  7. Parity Bit Replenishment for JPEG 2000-Based Video Streaming

    Directory of Open Access Journals (Sweden)

    François-Olivier Devaux

    2009-01-01

    Full Text Available This paper envisions coding with side information to design a highly scalable video codec. To achieve fine-grained scalability in terms of resolution, quality, and spatial access as well as temporal access to individual frames, the JPEG 2000 coding algorithm has been considered as the reference algorithm to encode INTRA information, and coding with side information has been envisioned to refresh the blocks that change between two consecutive images of a video sequence. One advantage of coding with side information compared to conventional closed-loop hybrid video coding schemes lies in the fact that parity bits are designed to correct stochastic errors and not to encode deterministic prediction errors. This enables the codec to support some desynchronization between the encoder and the decoder, which is particularly helpful to adapt on the fly pre-encoded content to fluctuating network resources and/or user preferences in terms of regions of interest. Regarding the coding scheme itself, to preserve both quality scalability and compliance to the JPEG 2000 wavelet representation, a particular attention has been devoted to the definition of a practical coding framework able to exploit not only the temporal but also spatial correlation among wavelet subbands coefficients, while computing the parity bits on subsets of wavelet bit-planes. Simulations have shown that compared to pure INTRA-based conditional replenishment solutions, the addition of the parity bits option decreases the transmission cost in terms of bandwidth, while preserving access flexibility.

  8. An Evaluation of Streaming Digital Video Resources in On- and Off-Campus Engineering Management Education

    Science.gov (United States)

    Palmer, Stuart

    2007-01-01

    A recent television documentary on the Columbia space shuttle disaster was converted to streaming digital video format for educational use by on- and off-campus students in an engineering management study unit examining issues in professional engineering ethics. An evaluation was conducted to assess the effectiveness of this new resource. Use of…

  9. Wireless live streaming video of laparoscopic surgery: a bandwidth analysis for handheld computers.

    Science.gov (United States)

    Gandsas, Alex; McIntire, Katherine; George, Ivan M; Witzke, Wayne; Hoskins, James D; Park, Adrian

    2002-01-01

    Over the last six years, streaming media has emerged as a powerful tool for delivering multimedia content over networks. Concurrently, wireless technology has evolved, freeing users from desktop boundaries and wired infrastructures. At the University of Kentucky Medical Center, we have integrated these technologies to develop a system that can wirelessly transmit live surgery from the operating room to a handheld computer. This study establishes the feasibility of using our system to view surgeries and describes the effect of bandwidth on image quality. A live laparoscopic ventral hernia repair was transmitted to a single handheld computer using five encoding speeds at a constant frame rate, and the quality of the resulting streaming images was evaluated. No video images were rendered when video data were encoded at 28.8 kilobytes per second (Kbps), the slowest encoding bitrate studied. The highest quality images were rendered at encoding speeds greater than or equal to 150 Kbps. Of note, a 15 second transmission delay was experienced using all four encoding schemes that rendered video images. We believe that the wireless transmission of streaming video to handheld computers has tremendous potential to enhance surgical education. For medical students and residents, the ability to view live surgeries, lectures, courses and seminars on handheld computers means a larger number of learning opportunities. In addition, we envision that wireless enabled devices may be used to telemonitor surgical procedures. However, bandwidth availability and streaming delay are major issues that must be addressed before wireless telementoring becomes a reality.

  10. The Davideon Project: Capitalizing the Possibilities of Streaming Video as Flexible Learning Objects for the Humanities

    Science.gov (United States)

    Rosendaal, Andre; Oomen, Johan

    2005-01-01

    Streaming video is a potentially revolutionary tool in humanities courses. The Davideon project, a large-scale effort conducted by the University of Groningen in conjunction with the University of Amsterdam, Windesheim University, and the Netherlands Institute for Sound and Vision, focused on integrating audiovisual materials into pedagogically…

  11. Constructing a Streaming Video-Based Learning Forum for Collaborative Learning

    Science.gov (United States)

    Chang, Chih-Kai

    2004-01-01

    As web-based courses using videos have become popular in recent years, the issue of managing audio-visual aids has become pertinent. Generally, the contents of audio-visual aids may include a lecture, an interview, a report, or an experiment, which may be transformed into a streaming format capable of making the quality of Internet-based videos…

  12. The EduPop: Improving Streaming Video for an Electronic Community.

    Science.gov (United States)

    Daugherty, Hubert; Cohn, Julie; Gorry, G. Anthony

    2003-01-01

    Provides examples of the need for enhanced streaming video in the greater Houston area, discussing how the EduPop router architecture meets this need by acting as a bridge for academic and commercial entities in the area. Catalogues the technological, organizational, and political challenges faced in implementing this architecture, offering a…

  13. Adaptive end-to-end optimization of mobile video streaming using QoS negotiation

    NARCIS (Netherlands)

    Taal, Jacco R.; Langendoen, Koen; van der Schaaf, Arjen; van Dijk, H.W.; Lagendijk, R. (Inald) L.

    Video streaming over wireless links is a non-trivial problem due to the large and frequent changes in the quality of the underlying radio channel combined with latency constraints. We believe that every layer in a mobile system must be prepared to adapt its behavior to its environment. Thus layers

  14. Capabilities of Raspberry Pi 2 for Big Data and Video Streaming Applications in Data Centres

    NARCIS (Netherlands)

    Schot, Nick J.; Velthuis, Paul J.E.; Postema, Björn Frits; Remke, Anne Katharina Ingrid; Remke, A.K.I.; Haverkort, Boudewijn R.H.M.; Haverkort, B.R.H.M.

    Many new data centres have been built in recent years in order to keep up with the rising demand for server capacity. These data centres require a lot of electrical energy and cooling. Big data and video streaming are two heavily used applications in data centres. This paper experimentally

  15. Using Text Mining to Uncover Students' Technology-Related Problems in Live Video Streaming

    Science.gov (United States)

    Abdous, M'hammed; He, Wu

    2011-01-01

    Because of their capacity to sift through large amounts of data, text mining and data mining are enabling higher education institutions to reveal valuable patterns in students' learning behaviours without having to resort to traditional survey methods. In an effort to uncover live video streaming (LVS) students' technology related-problems and to…

  16. A real-time remote video streaming platform for ultrasound imaging.

    Science.gov (United States)

    Ahmadi, Mehdi; Gross, Warren J; Kadoury, Samuel

    2016-08-01

    Ultrasound is a viable imaging technology in remote and resources-limited areas. Ultrasonography is a user-dependent skill which depends on a high degree of training and hands-on experience. However, there is a limited number of skillful sonographers located in remote areas. In this work, we aim to develop a real-time video streaming platform which allows specialist physicians to remotely monitor ultrasound exams. To this end, an ultrasound stream is captured and transmitted through a wireless network into remote computers, smart-phones and tablets. In addition, the system is equipped with a camera to track the position of the ultrasound probe. The main advantage of our work is using an open source platform for video streaming which gives us more control over streaming parameters than the available commercial products. The transmission delays of the system are evaluated for several ultrasound video resolutions and the results show that ultrasound videos close to the high-definition (HD) resolution can be received and displayed on an Android tablet with the delay of 0.5 seconds which is acceptable for accurate real-time diagnosis.

  17. Intelligent Packet Shaper to Avoid Network Congestion for Improved Streaming Video Quality at Clients

    DEFF Research Database (Denmark)

    Kaul, Manohar; Khosla, Rajiv; Mitsukura, Y

    2003-01-01

    of this intelligent traffic-shaping algorithm on the underlying network real time packet traffic and the eradication of unwanted abruption in the streaming video qualiy. This paper concluded from the end results of the simulation that neural networks are a very superior means of modeling real-time traffic......This paper proposes a traffic shaping algorithm based on neural networks, which adapts to a network over which streaming video is being transmitted. The purpose of this intelligent shaper is to eradicate all traffic congestion and improve the end-user's video quality. It possesses the capability...... to predict, to a very high level of accuracy, a state of congestion based upon the training data collected about the network behaviour. Initially, the current traffic shaping technologies are discussed and later a simulation in a controlled environment is illustrated to exhibit the effects...

  18. Distributed video streaming using multiple description coding and unequal error protection.

    Science.gov (United States)

    Kim, Joohee; Mersereau, Russell M; Altunbasak, Yucel

    2005-07-01

    This paper presents a distributed video streaming framework using unbalanced multiple description coding (MDC) and unequal error protection. In the proposed video streaming framework, two senders simultaneously stream complementary descriptions to a single receiver over different paths. To minimize the overall distortion and exploit the benefits of multipath transport when the characteristics of each path are different, an unbalanced MDC method for wavelet-based coders combined with a TCP-friendly rate allocation algorithm is proposed. The proposed rate allocation algorithm adjusts the transmission rates and the channel coding rates for all senders in a coordinated fashion to minimize the overall distortion. Simulation results show that the proposed unbalanced MDC combined with our rate allocation algorithm achieves about 1-6 dB higher peal signal-to-noise ratio compared to conventional balanced MDC when the available bandwidths along the two paths are different under time-varying network conditions.

  19. Learning a Continuous-Time Streaming Video QoE Model.

    Science.gov (United States)

    Ghadiyaram, Deepti; Pan, Janice; Bovik, Alan C

    2018-05-01

    Over-the-top adaptive video streaming services are frequently impacted by fluctuating network conditions that can lead to rebuffering events (stalling events) and sudden bitrate changes. These events visually impact video consumers' quality of experience (QoE) and can lead to consumer churn. The development of models that can accurately predict viewers' instantaneous subjective QoE under such volatile network conditions could potentially enable the more efficient design of quality-control protocols for media-driven services, such as YouTube, Amazon, Netflix, and so on. However, most existing models only predict a single overall QoE score on a given video and are based on simple global video features, without accounting for relevant aspects of human perception and behavior. We have created a QoE evaluator, called the time-varying QoE Indexer, that accounts for interactions between stalling events, analyzes the spatial and temporal content of a video, predicts the perceptual video quality, models the state of the client-side data buffer, and consequently predicts continuous-time quality scores that agree quite well with human opinion scores. The new QoE predictor also embeds the impact of relevant human cognitive factors, such as memory and recency, and their complex interactions with the video content being viewed. We evaluated the proposed model on three different video databases and attained standout QoE prediction performance.

  20. Use of streamed internet video for cytology training and education: www.PathLab.org.

    Science.gov (United States)

    Poller, David; Ljung, Britt-Marie; Gonda, Peter

    2009-05-01

    An Internet-based method is described for submission of video clips to a website editor to be reviewed, edited, and then uploaded onto a video server, with a hypertext link to a website. The information on the webpages is searchable via the website sitemap on Internet search engines. A survey of video users who accessed a single 59-minute FNA cytology training cytology video via the website showed a mean score for usefulness for specialists/consultants of 3.75, range 1-5, n = 16, usefulness for trainees mean score was 4.4, range 3-5, n = 12, with a mean score for visual and sound quality of 3.9, range 2-5, n = 16. Fifteen out of 17 respondents thought that posting video training material on the Internet was a good idea, and 9 of 17 respondents would also consider submitting training videos to a similar website. This brief exercise has shown that there is value in posting educational or training video content on the Internet and that the use of streamed video accessed via the Internet will be of increasing importance. (c) 2009 Wiley-Liss, Inc.

  1. Game-theoretic pricing for video streaming in mobile networks.

    Science.gov (United States)

    Lin, W Sabrina; Liu, K J Ray

    2012-05-01

    Mobile phones are among the most popular consumer devices, and the recent developments of 3G networks and smart phones enable users to watch video programs by subscribing data plans from service providers. Due to the ubiquity of mobile phones and phone-to-phone communication technologies, data-plan subscribers can redistribute the video content to nonsubscribers. Such a redistribution mechanism is a potential competitor for the mobile service provider and is very difficult to trace given users' high mobility. The service provider has to set a reasonable price for the data plan to prevent such unauthorized redistribution behavior to protect or maximize his/her own profit. In this paper, we analyze the optimal price setting for the service provider by investigating the equilibrium between the subscribers and the secondary buyers in the content-redistribution network. We model the behavior between the subscribers and the secondary buyers as a noncooperative game and find the optimal price and quantity for both groups of users. Based on the behavior of users in the redistribution network, we investigate the evolutionarily stable ratio of mobile users who decide to subscribe to the data plan. Such an analysis can help the service provider preserve his/her profit under the threat of the redistribution networks and can improve the quality of service for end users.

  2. Online Videoconferencing Products: Update

    Science.gov (United States)

    Burton, Douglas; Kitchen, Tim

    2011-01-01

    Software allowing real-time online video connectivity is rapidly evolving. The ability to connect students, staff, and guest speakers instantaneously carries great benefits for the online distance education classroom. This evaluation report compares four software applications at opposite ends of the cost spectrum: "DimDim", "Elluminate VCS",…

  3. Guide to Instructional Videoconferencing.

    Science.gov (United States)

    Matthews, Denise; Reiss, John G.

    An instructional videoconference (IVC) is an interactive delivery mechanism for long-distance communication and education, which uses 2-way audio and 1- or 2-way video to facilitate interaction between presenters and learners who are separated by significant distance. This guide, intended for the staff of federal, state, and local programs that…

  4. Priority-based methods for reducing the impact of packet loss on HEVC encoded video streams

    Science.gov (United States)

    Nightingale, James; Wang, Qi; Grecos, Christos

    2013-02-01

    The rapid growth in the use of video streaming over IP networks has outstripped the rate at which new network infrastructure has been deployed. These bandwidth-hungry applications now comprise a significant part of all Internet traffic and present major challenges for network service providers. The situation is more acute in mobile networks where the available bandwidth is often limited. Work towards the standardisation of High Efficiency Video Coding (HEVC), the next generation video coding scheme, is currently on track for completion in 2013. HEVC offers the prospect of a 50% improvement in compression over the current H.264 Advanced Video Coding standard (H.264/AVC) for the same quality. However, there has been very little published research on HEVC streaming or the challenges of delivering HEVC streams in resource-constrained network environments. In this paper we consider the problem of adapting an HEVC encoded video stream to meet the bandwidth limitation in a mobile networks environment. Video sequences were encoded using the Test Model under Consideration (TMuC HM6) for HEVC. Network abstraction layers (NAL) units were packetized, on a one NAL unit per RTP packet basis, and transmitted over a realistic hybrid wired/wireless testbed configured with dynamically changing network path conditions and multiple independent network paths from the streamer to the client. Two different schemes for the prioritisation of RTP packets, based on the NAL units they contain, have been implemented and empirically compared using a range of video sequences, encoder configurations, bandwidths and network topologies. In the first prioritisation method the importance of an RTP packet was determined by the type of picture and the temporal switching point information carried in the NAL unit header. Packets containing parameter set NAL units and video coding layer (VCL) NAL units of the instantaneous decoder refresh (IDR) and the clean random access (CRA) pictures were given the

  5. Downlink Video Streaming for Users Non-Equidistant from Base Station

    Directory of Open Access Journals (Sweden)

    S. Pejoski

    2012-06-01

    Full Text Available We consider multiuser video transmission for users that are non-equidistantly positioned from base station. We propose a greedy algorithm for video streaming in a wireless system with capacity achieving channel coding, that implements the cross-layer principle by partially separating the physical and the application layer. In such a system the parameters at the physical layer are dependent on the packet length and the conditions in the wireless channel and the parameters at the application layer are dependent on the reduction of the expected distortion assuming no packet errors in the system. We also address the fairness in the multiuser video system with non-equidistantly positioned users. Our fairness algorithm is based on modified opportunistic round robin scheduling. We evaluate the performance of the proposed algorithms by simulating the transmission of H.264/AVC video signals in a TDMA wireless system.

  6. Adaptive Video Streaming Using Bandwidth Estimation for 3.5G Mobile Network

    Science.gov (United States)

    Nam, Hyeong-Min; Park, Chun-Su; Jung, Seung-Won; Ko, Sung-Jea

    Currently deployed mobile networks including High Speed Downlink Packet Access (HSDPA) offer only best-effort Quality of Service (QoS). In wireless best effort networks, the bandwidth variation is a critical problem, especially, for mobile devices with small buffers. This is because the bandwidth variation leads to packet losses caused by buffer overflow as well as picture freezing due to high transmission delay or buffer underflow. In this paper, in order to provide seamless video streaming over HSDPA, we propose an efficient real-time video streaming method that consists of the available bandwidth (AB) estimation for the HSDPA network and the transmission rate control to prevent buffer overflows/underflows. In the proposed method, the client estimates the AB and the estimated AB is fed back to the server through real-time transport control protocol (RTCP) packets. Then, the server adaptively adjusts the transmission rate according to the estimated AB and the buffer state obtained from the RTCP feedback information. Experimental results show that the proposed method achieves seamless video streaming over the HSDPA network providing higher video quality and lower transmission delay.

  7. Reducing video-quality fluctuations for streaming scalable video using unequal error protection, retransmission, and interleaving.

    Science.gov (United States)

    Gan, Tong; Gan, Lu; Ma, Kai-Kuang

    2006-04-01

    Forward error correction based multiple description (MD-FEC) transcoding for transmitting embedded bitstream over the packet erasure networks has been extensively studied in the past. In the existing work, a single embedded source bitstream, e.g., the bitstream of a group of pictures (GOP) encoded using three-dimensional set partitioning in hierarchical trees is optimally protected unequal error protection (UEP) in the rate-distortion sense. However, most of the previous work on transmitting embedded video using MD-FEC assumed that one GOP is transmitted only once, and did not consider the chance of retransmission. This may lead to noticeable video quality variations due to varying channel conditions. In this paper, a novel window-based packetization scheme is proposed, which combats bursty packet loss by combining the following three techniques: UEP, retransmission, and GOP-level interleaving. In particular, two retransmission mechanisms, namely segment-wise retransmission and byte-wise retransmission, are proposed based on different types of receiver feedback. Moreover, two levels of rate allocations are introduced: intra-GOP rate allocation minimizes the distortion of individual GOP; while inter-GOP rate allocation intends to reduce video quality fluctuations by adaptively allocating bandwidth according to video signal characteristics and client buffer status. In this way, more consistent video quality can be achieved under various packet loss probabilities, as demonstrated by our experimental results.

  8. Providing a Spanish interpreter using low-cost videoconferencing in a community study computers

    Directory of Open Access Journals (Sweden)

    James L Wofford

    2013-03-01

    Full Text Available Background The advent of more mobile, more reliable, and more affordable videoconferencing technology finally makes it realistic to offer remote foreign language interpretation in the office setting. Still, such technologies deserve proof of acceptability to clinicians and patients before there is widespread acceptance and routine use.Objective We sought to examine: (1 the audio and video technical fidelity of iPad/Facetime software, (2 the acceptability of videoconferencing to patients and clinicians.Methods The convenience sample included Spanish-speaking adult patients at a community health care medicine clinic in 2011. Videoconferencing was conducted using two iPads connecting patient/physician located in the clinic examination room, and the interpreter in a remote/separate office in the same building. A five-item survey was used to solicit opinions on overall quality of the videoconferencing device, audio/video integrity/fidelity, perception of encounter duration, and attitude toward future use.Results Twenty-five patients, 18 clinicians and 5 interpreters participated in the project. Most patients (24/25 rated overall quality of videoconferencing as good/excellent with only 1 ‘fair’ rating. Eleven patients rated the amount of time as no longer than in-person, and nine reported it as shorter than in person. Most patients, 94.0% (24/25, favoured using videoconferencing during future visits. For the 18 clinicians, the results were similar.Conclusions Based on our experience at a single-site community health centre, the videoconferencing technology appeared to be flawless, and both patients and clinicians were satisfied. Expansion of videoconferencing to other off-site healthcare professionals should be considered in the search for more cost-effective healthcare.

  9. Online Videoconferencing Products: Update

    Directory of Open Access Journals (Sweden)

    Douglas Burton

    2011-02-01

    Full Text Available Software allowing real-time online video connectivity is rapidly evolving. The ability to connect students, staff, and guest speakers instantaneously carries great benefits for the online distance education classroom. This evaluation report compares four software applications at opposite ends of the cost spectrum: DimDim, Elluminate VCS, TokBox, and Vyew. Their benefits and shortcomings are contrasted, and efficient educational scenarios for them are suggested.

  10. MAC-Layer Active Dropping for Real-Time Video Streaming in 4G Access Networks

    KAUST Repository

    She, James

    2010-12-01

    This paper introduces a MAC-layer active dropping scheme to achieve effective resource utilization, which can satisfy the application-layer delay for real-time video streaming in time division multiple access based 4G broadband wireless access networks. When a video frame is not likely to be reconstructed within the application-layer delay bound at a receiver for the minimum decoding requirement, the MAC-layer protocol data units of such video frame will be proactively dropped before the transmission. An analytical model is developed to evaluate how confident a video frame can be delivered within its application-layer delay bound by jointly considering the effects of time-varying wireless channel, minimum decoding requirement of each video frame, data retransmission, and playback buffer. Extensive simulations with video traces are conducted to prove the effectiveness of the proposed scheme. When compared to conventional cross-layer schemes using prioritized-transmission/retransmission, the proposed scheme is practically implementable for more effective resource utilization, avoiding delay propagation, and achieving better video qualities under certain conditions.

  11. Intelligent Stale-Frame Discards for Real-Time Video Streaming over Wireless Ad Hoc Networks

    Directory of Open Access Journals (Sweden)

    Sheu Tsang-Ling

    2009-01-01

    Full Text Available Abstract This paper presents intelligent early packet discards (I-EPD for real-time video streaming over a multihop wireless ad hoc network. In a multihop wireless ad hoc network, the quality of transferring real-time video streams could be seriously degraded, since every intermediate node (IN functionally like relay device does not possess large buffer and sufficient bandwidth. Even worse, a selected relay node could leave or power off unexpectedly, which breaks the route to destination. Thus, a stale video frame is useless even if it can reach destination after network traffic becomes smooth or failed route is reconfigured. In the proposed I-EPD, an IN can intelligently determine whether a buffered video packet should be early discarded. For the purpose of validation, we implement the I-EPD on Linux-based embedded systems. Via the comparisons of performance metrics (packet/frame discards ratios, PSNR, etc., we demonstrate that video quality over a wireless ad hoc network can be substantially improved and unnecessary bandwidth wastage is greatly reduced.

  12. Intelligent Stale-Frame Discards for Real-Time Video Streaming over Wireless Ad Hoc Networks

    Directory of Open Access Journals (Sweden)

    Yung-Shih Chi

    2009-01-01

    Full Text Available This paper presents intelligent early packet discards (I-EPD for real-time video streaming over a multihop wireless ad hoc network. In a multihop wireless ad hoc network, the quality of transferring real-time video streams could be seriously degraded, since every intermediate node (IN functionally like relay device does not possess large buffer and sufficient bandwidth. Even worse, a selected relay node could leave or power off unexpectedly, which breaks the route to destination. Thus, a stale video frame is useless even if it can reach destination after network traffic becomes smooth or failed route is reconfigured. In the proposed I-EPD, an IN can intelligently determine whether a buffered video packet should be early discarded. For the purpose of validation, we implement the I-EPD on Linux-based embedded systems. Via the comparisons of performance metrics (packet/frame discards ratios, PSNR, etc., we demonstrate that video quality over a wireless ad hoc network can be substantially improved and unnecessary bandwidth wastage is greatly reduced.

  13. Performance analysis of medical video streaming over mobile WiMAX.

    Science.gov (United States)

    Alinejad, Ali; Philip, N; Istepanian, R H

    2010-01-01

    Wireless medical ultrasound streaming is considered one of the emerging application within the broadband mobile healthcare domain. These applications are considered as bandwidth demanding services that required high data rates with acceptable diagnostic quality of the transmitted medical images. In this paper, we present the performance analysis of a medical ultrasound video streaming acquired via special robotic ultrasonography system over emulated WiMAX wireless network. The experimental set-up of this application is described together with the performance of the relevant medical quality of service (m-QoS) metrics.

  14. Meteoroid orbits from video meteors. The case of the Geminid stream

    Science.gov (United States)

    Hajduková, Mária, Jr.; Koten, Pavel; Kornoš, Leonard; Tóth, Juraj

    2017-09-01

    We use the Slovak and Czech video meteor observations, as well as video meteoroid orbits collected in the CAMS, SonotaCo, EDMOND and DMS catalogues, for an analysis of the distribution of meteoroid orbits within the stream of the Geminids and of the dispersion of their radiants. We concentrate on the influence of the measurement errors on the precision of the orbits obtained from the video networks that are based on various meteor-detection software packages and various meteor orbital element softwares. The Geminids radiant dispersion obtained from the large video catalogues reaches the dispersion of the radio observed Geminids, whereby the diffused marginal regions are affected mostly by meteoroids with extreme values (small or large) of the semi-major axes. Meteoroids of shorter semi-major axes concentrate at the eastern side of the radiant area and those of longer semi-major axes at the western part. The observed orbital dispersions in the Geminid stream described by the median absolute deviation range from 0.029 to 0.042 AU-1 for the video catalogues. The distribution of the semi-major axes of video meteors in all the databases, except for the Ondřejov (Czech) data, seem to be systematically biased in comparison with the photographic and radio meteors. The determined velocities of the video data are underestimated, probably as a consequence of the methods used for the positional and velocity measurements. The largest shift is observed in the EDMOND and SonotaCo catalogues. Except for the measurement errors which influence the analyses and their interpretations, we also point out the problem of the uncertainties of the numerical integration procedures that influence the simulations' results. Several experimental integrations of the Geminids parent asteroid, which we performed from the present to the past and then back to the year 2015, showed that a complete reproduction, including also the mean anomaly, is only possible for a time span of about 2700 years.

  15. Task-oriented quality assessment and adaptation in real-time mission critical video streaming applications

    Science.gov (United States)

    Nightingale, James; Wang, Qi; Grecos, Christos

    2015-02-01

    In recent years video traffic has become the dominant application on the Internet with global year-on-year increases in video-oriented consumer services. Driven by improved bandwidth in both mobile and fixed networks, steadily reducing hardware costs and the development of new technologies, many existing and new classes of commercial and industrial video applications are now being upgraded or emerging. Some of the use cases for these applications include areas such as public and private security monitoring for loss prevention or intruder detection, industrial process monitoring and critical infrastructure monitoring. The use of video is becoming commonplace in defence, security, commercial, industrial, educational and health contexts. Towards optimal performances, the design or optimisation in each of these applications should be context aware and task oriented with the characteristics of the video stream (frame rate, spatial resolution, bandwidth etc.) chosen to match the use case requirements. For example, in the security domain, a task-oriented consideration may be that higher resolution video would be required to identify an intruder than to simply detect his presence. Whilst in the same case, contextual factors such as the requirement to transmit over a resource-limited wireless link, may impose constraints on the selection of optimum task-oriented parameters. This paper presents a novel, conceptually simple and easily implemented method of assessing video quality relative to its suitability for a particular task and dynamically adapting videos streams during transmission to ensure that the task can be successfully completed. Firstly we defined two principle classes of tasks: recognition tasks and event detection tasks. These task classes are further subdivided into a set of task-related profiles, each of which is associated with a set of taskoriented attributes (minimum spatial resolution, minimum frame rate etc.). For example, in the detection class

  16. Video to Go: the effects of mobility on streaming media in a CDMA2000 1xEV-DO network

    Science.gov (United States)

    Sessini, Phillipa; Leventer, Matei; Mahanti, Anirban

    2007-01-01

    This paper experimentally examines the performance of streaming media applications over a CDMA2000 1xEV-DO network. The performance of streaming in a cellular network is tested across three different levels of mobility, two applications, and the two transport layer protocols, TCP and UDP. Findings of this study are that streaming applications are impacted more by sources of interference such as high-rise buildings than by increased velocity. Also, when the mobile client is stationary, high data rates and high video quality are consistently achieved. We also find that for the streaming applications considered, UDP streams outperform TCP streams, consistently achieving higher bandwidth.

  17. Enhancing the Dialogue in Simultaneous Class-Based and Live Video-Streamed Teaching

    DEFF Research Database (Denmark)

    Jelsbak, Vibe Alopaeus; Ørngreen, Rikke; Thorsen, Jonas

    2015-01-01

    from home via the Internet. In live video-streamed teaching classes teachers tend to choose one-way communication instead of dialogue. We know from our early findings that technology issues are one of the main reasons for this, since the same teachers use dialogue and discussions in traditional......The bachelor programme in biomedical laboratory analysis at VIA University College in Aarhus has established a blended class concept which combines traditional and live broadcast teaching. 1-2 days a week students have the choice either to attend teaching sessions in the traditional way or to work...... teaching. This paper describes a work-in-progress project focused on developing possibilities for a more dialogue-based approach to live video-streamed teaching. We present our new setup and argue for educational designs which this is believed to support, and we outline the research design for collecting...

  18. Enhancing the Dialogue in Simultaneous Class-Based and Live Video-Streamed Teaching

    DEFF Research Database (Denmark)

    Jelsbak, Vibe Alopaeus; Bendsen, Thomas; Thorsen, Jonas

    2015-01-01

    or to work from home via the Internet. In live video-streamed teaching classes teachers tend to choose one-way communication instead of dialogue. We know from our early findings that technology issues are one of the main reasons for this, since the same teachers use dialogue and discussions in traditional......Abstract: The bachelor programme in biomedical laboratory analysis at VIA University College in Aarhus has established a blended class concept which combines traditional and live broadcast teaching. 1-2 days a week students have the choice either to attend teaching sessions in the traditional way...... teaching. This paper describes a work-in-progress project focused on developing possibilities for a more dialogue-based approach to live video-streamed teaching. We present our new setup and argue for educational de- signs which this is believed to support, and we outline the research design for collecting...

  19. Optimisation Issues of High Throughput Medical Data and Video Streaming Traffic in 3G Wireless Environments.

    Science.gov (United States)

    Istepanian, R S H; Philip, N

    2005-01-01

    In this paper we describe some of the optimisation issues relevant to the requirements of high throughput of medical data and video streaming traffic in 3G wireless environments. In particular we present a challenging 3G mobile health care application that requires a demanding 3G medical data throughput. We also describe the 3G QoS requirement of mObile Tele-Echography ultra-Light rObot system (OTELO that is designed to provide seamless 3G connectivity for real-time ultrasound medical video streams and diagnosis from a remote site (robotic and patient station) manipulated by an expert side (specialists) that is controlling the robotic scanning operation and presenting a real-time feedback diagnosis using 3G wireless communication links.

  20. The effects of camera jitter for background subtraction algorithms on fused infrared-visible video streams

    Science.gov (United States)

    Becker, Stefan; Scherer-Negenborn, Norbert; Thakkar, Pooja; Hübner, Wolfgang; Arens, Michael

    2016-10-01

    This paper is a continuation of the work of Becker et al.1 In their work, they analyzed the robustness of various background subtraction algorithms on fused video streams originating from visible and infrared cameras. In order to cover a broader range of background subtraction applications, we show the effects of fusing infrared-visible video streams from vibrating cameras on a large set of background subtraction algorithms. The effectiveness is quantitatively analyzed on recorded data of a typical outdoor sequence with a fine-grained and accurate annotation of the images. Thereby, we identify approaches which can benefit from fused sensor signals with camera jitter. Finally conclusions on what fusion strategies should be preferred under such conditions are given.

  1. On Cross-Layer Design for Streaming Video Delivery in Multiuser Wireless Environments

    Directory of Open Access Journals (Sweden)

    Kellerer Wolfgang

    2006-01-01

    Full Text Available We exploit the interlayer coupling of a cross-layer design concept for streaming video delivery in a multiuser wireless environment. We propose a cross-layer optimization between application layer, data link layer, and physical layer. Our aim is to optimize the end-to-end quality of the wireless streaming video application as well as efficiently utilizing the wireless resources. A possible architecture for achieving this goal is proposed and formulated. This architecture consists of the process of parameter abstraction, a cross-layer optimizer, and the process of decision distribution. In addition, numerical results obtained with different operating modes are provided. The results demonstrate the potential of this proposed joint optimization.

  2. A high performance FDDI NIU for streaming voice, video, and data

    Science.gov (United States)

    Bergman, L. A.; Hartmayer, R.; Wu, W.; Cassell, P.; Edgar, G.; Lambert, J.; Mancini, R.; Jeng, J.; Pardo, C.; Halloran, F.

    1991-01-01

    A 100-Mbit/s FDDI network interface unit (NIU) is described that supports real-time data, voice and video. Its high-speed interrupt-driven hardware architecture efficiently manages stream and packet data transfers to the FDDI network. Other enhancements include modular single-mode laser-dioce fiber optic links to maximize node spacing, optic bypass switches for increased fault tolerance, and a hardware performance monitor to gather real-time network diagnostics.

  3. Rate-Distortion Optimized Frame Dropping for Multiuser Streaming and Conversational Videos

    OpenAIRE

    Eckehard Steinbach; Jacob Chakareski; Wei Tu

    2008-01-01

    We consider rate-distortion optimized strategies for dropping frames from multiple conversational and streaming videos sharing limited network node resources. The dropping strategies are based on side information that is extracted during encoding and is sent along the regular bitstream. The additional transmission overhead and the computational complexity of the proposed frame dropping schemes are analyzed. Our experimental results show that a significant improvement in end-to-end performance...

  4. Control and Innovation on Digital Platforms : the case of Netflix and streaming of video content

    OpenAIRE

    Vigeland, Eirik

    2012-01-01

    In this thesis I investigate innovation processes on innovation platforms, and look at the role played by content release for innovation in digital distribution of home entertainment. I argue that innovation platforms rely on several aspects of innovation in order to succeed, and this thesis is concerned with one of these, namely release of digital entertainment content. I use the American video streaming service Netflix as a case and example of such an innovation platform. By using techno...

  5. Cross-layer Control for Adaptive Video Streaming over Wireless Access Networks

    OpenAIRE

    Abdallah AbouSheaisha, Abdallah Sabry

    2016-01-01

    Over the last decade, the wide deployment of wireless access technologies (e.g. WiFi, 3G, and LTE) and the remarkable growth in the volume of streaming video content have significantly altered the telecommunications field. These developments introduce new challenges to the research community including the need to develop new solutions (e.g. traffic models and transport protocols) to address changing traffic patterns and the characteristics of wireless links and the need for new evaluation me...

  6. An Approach to Streaming Video Segmentation With Sub-Optimal Low-Rank Decomposition.

    Science.gov (United States)

    Li, Chenglong; Lin, Liang; Zuo, Wangmeng; Wang, Wenzhong; Tang, Jin

    2016-05-01

    This paper investigates how to perform robust and efficient video segmentation while suppressing the effects of data noises and/or corruptions, and an effective approach is introduced to this end. First, a general algorithm, called sub-optimal low-rank decomposition (SOLD), is proposed to pursue the low-rank representation for video segmentation. Given the data matrix formed by supervoxel features of an observed video sequence, SOLD seeks a sub-optimal solution by making the matrix rank explicitly determined. In particular, the representation coefficient matrix with the fixed rank can be decomposed into two sub-matrices of low rank, and then we iteratively optimize them with closed-form solutions. Moreover, we incorporate a discriminative replication prior into SOLD based on the observation that small-size video patterns tend to recur frequently within the same object. Second, based on SOLD, we present an efficient inference algorithm to perform streaming video segmentation in both unsupervised and interactive scenarios. More specifically, the constrained normalized-cut algorithm is adopted by incorporating the low-rank representation with other low level cues and temporal consistent constraints for spatio-temporal segmentation. Extensive experiments on two public challenging data sets VSB100 and SegTrack suggest that our approach outperforms other video segmentation approaches in both accuracy and efficiency.

  7. Cross-Layer Design of Source Rate Control and Congestion Control for Wireless Video Streaming

    Directory of Open Access Journals (Sweden)

    Peng Zhu

    2007-01-01

    Full Text Available Cross-layer design has been used in streaming video over the wireless channels to optimize the overall system performance. In this paper, we extend our previous work on joint design of source rate control and congestion control for video streaming over the wired channel, and propose a cross-layer design approach for wireless video streaming. First, we extend the QoS-aware congestion control mechanism (TFRCC proposed in our previous work to the wireless scenario, and provide a detailed discussion about how to enhance the overall performance in terms of rate smoothness and responsiveness of the transport protocol. Then, we extend our previous joint design work to the wireless scenario, and a thorough performance evaluation is conducted to investigate its performance. Simulation results show that by cross-layer design of source rate control at application layer and congestion control at transport layer, and by taking advantage of the MAC layer information, our approach can avoid the throughput degradation caused by wireless link error, and better support the QoS requirements of the application. Thus, the playback quality is significantly improved, while good performance of the transport protocol is still preserved.

  8. A new error resilience method for FGS video enhancement bit-stream

    Science.gov (United States)

    Ma, Ran; Zhang, Zhao-yang; An, Ping

    2006-05-01

    Video streaming over the Internet usually encounters with bandwidth variations and packet losses, which impacted badly on the reconstructed video quality. Fine Granularity Scalability (FGS) can well provide bit-rate adaptability to different bandwidth conditions over the Internet, due to its fine granular and error resilience. However, the effective solution of packet losses is Multiple Description Coding (MDC), but a great deal of redundancy information is brought up. For an FGS video bit-stream, the base layer is usually very small and of high importance, error-free transmission could be achieved through classical error resilience technique. As a result, the overall streaming quality is mostly dependent on the enhancement layer. Moreover, it is worthy of note that the different bit-planes are of different importance, which are suitable to unequal protection (UEP) strategy. So, a new joint MDC and UEP method is proposed to protect the enhancement layer in this paper. In the proposed method, the MDC encoder/decoder is embedded into the normal enhancement layer encoder/decoder. By considering of the unequal protection of bit-plane and the redundancy of MDC, the two most significant bit-planes adopt the MDC-based strategy. While, the remaining bit-planes only encoded by normal enhancement layer coding system. Experimental results are demonstrated to testify the efficiency of our proposed method.

  9. Comprehensive Protection of Data-Partitioned Video for Broadband Wireless IPTV Streaming

    Directory of Open Access Journals (Sweden)

    Laith Al-Jobouri

    2012-01-01

    Full Text Available This paper examines the threat to video streaming from slow and fast fading, traffic congestion, and channel packet drops. The proposed response is a combination of: rateless channel coding, which is adaptively applied; data-partitioned source coding to exploit prioritized packetization; and duplicate slice provision, which is the focus of the evaluation in this paper. The paper also considers the distribution of intra-refresh macroblocks as a means of avoiding sudden data rate increases. When error bursts occur, this paper shows that duplicate slices are certainly necessary but this provision is more effective for medium quality video than it is for high quality video. The percentage of intra-refresh macroblocks can be low and still reduce the impact of temporal error propagation.

  10. Reliable Adaptive Video Streaming Driven by Perceptual Semantics for Situational Awareness.

    Science.gov (United States)

    Pimentel-Niño, M A; Saxena, Paresh; Vazquez-Castro, M A

    2015-01-01

    A novel cross-layer optimized video adaptation driven by perceptual semantics is presented. The design target is streamed live video to enhance situational awareness in challenging communications conditions. Conventional solutions for recreational applications are inadequate and novel quality of experience (QoE) framework is proposed which allows fully controlled adaptation and enables perceptual semantic feedback. The framework relies on temporal/spatial abstraction for video applications serving beyond recreational purposes. An underlying cross-layer optimization technique takes into account feedback on network congestion (time) and erasures (space) to best distribute available (scarce) bandwidth. Systematic random linear network coding (SRNC) adds reliability while preserving perceptual semantics. Objective metrics of the perceptual features in QoE show homogeneous high performance when using the proposed scheme. Finally, the proposed scheme is in line with content-aware trends, by complying with information-centric-networking philosophy and architecture.

  11. Reliable Adaptive Video Streaming Driven by Perceptual Semantics for Situational Awareness

    Science.gov (United States)

    Pimentel-Niño, M. A.; Saxena, Paresh; Vazquez-Castro, M. A.

    2015-01-01

    A novel cross-layer optimized video adaptation driven by perceptual semantics is presented. The design target is streamed live video to enhance situational awareness in challenging communications conditions. Conventional solutions for recreational applications are inadequate and novel quality of experience (QoE) framework is proposed which allows fully controlled adaptation and enables perceptual semantic feedback. The framework relies on temporal/spatial abstraction for video applications serving beyond recreational purposes. An underlying cross-layer optimization technique takes into account feedback on network congestion (time) and erasures (space) to best distribute available (scarce) bandwidth. Systematic random linear network coding (SRNC) adds reliability while preserving perceptual semantics. Objective metrics of the perceptual features in QoE show homogeneous high performance when using the proposed scheme. Finally, the proposed scheme is in line with content-aware trends, by complying with information-centric-networking philosophy and architecture. PMID:26247057

  12. Energy-Efficient Bandwidth Allocation for Multiuser Scalable Video Streaming over WLAN

    Directory of Open Access Journals (Sweden)

    Lafruit Gauthier

    2008-01-01

    Full Text Available Abstract We consider the problem of packet scheduling for the transmission of multiple video streams over a wireless local area network (WLAN. A cross-layer optimization framework is proposed to minimize the wireless transceiver energy consumption while meeting the user required visual quality constraints. The framework relies on the IEEE 802.11 standard and on the embedded bitstream structure of the scalable video coding scheme. It integrates an application-level video quality metric as QoS constraint (instead of a communication layer quality metric with energy consumption optimization through link layer scaling and sleeping. Both energy minimization and min-max energy optimization strategies are discussed. Simulation results demonstrate significant energy gains compared to the state-of-the-art approaches.

  13. Energy-Efficient Bandwidth Allocation for Multiuser Scalable Video Streaming over WLAN

    Directory of Open Access Journals (Sweden)

    Xin Ji

    2008-01-01

    Full Text Available We consider the problem of packet scheduling for the transmission of multiple video streams over a wireless local area network (WLAN. A cross-layer optimization framework is proposed to minimize the wireless transceiver energy consumption while meeting the user required visual quality constraints. The framework relies on the IEEE 802.11 standard and on the embedded bitstream structure of the scalable video coding scheme. It integrates an application-level video quality metric as QoS constraint (instead of a communication layer quality metric with energy consumption optimization through link layer scaling and sleeping. Both energy minimization and min-max energy optimization strategies are discussed. Simulation results demonstrate significant energy gains compared to the state-of-the-art approaches.

  14. Lightweight Object Tracking in Compressed Video Streams Demonstrated in Region-of-Interest Coding

    Directory of Open Access Journals (Sweden)

    Rik Van de Walle

    2007-01-01

    Full Text Available Video scalability is a recent video coding technology that allows content providers to offer multiple quality versions from a single encoded video file in order to target different kinds of end-user devices and networks. One form of scalability utilizes the region-of-interest concept, that is, the possibility to mark objects or zones within the video as more important than the surrounding area. The scalable video coder ensures that these regions-of-interest are received by an end-user device before the surrounding area and preferably in higher quality. In this paper, novel algorithms are presented making it possible to automatically track the marked objects in the regions of interest. Our methods detect the overall motion of a designated object by retrieving the motion vectors calculated during the motion estimation step of the video encoder. Using this knowledge, the region-of-interest is translated, thus following the objects within. Furthermore, the proposed algorithms allow adequate resizing of the region-of-interest. By using the available information from the video encoder, object tracking can be done in the compressed domain and is suitable for real-time and streaming applications. A time-complexity analysis is given for the algorithms proving the low complexity thereof and the usability for real-time applications. The proposed object tracking methods are generic and can be applied to any codec that calculates the motion vector field. In this paper, the algorithms are implemented within MPEG-4 fine-granularity scalability codec. Different tests on different video sequences are performed to evaluate the accuracy of the methods. Our novel algorithms achieve a precision up to 96.4%.

  15. Lightweight Object Tracking in Compressed Video Streams Demonstrated in Region-of-Interest Coding

    Directory of Open Access Journals (Sweden)

    Lerouge Sam

    2007-01-01

    Full Text Available Video scalability is a recent video coding technology that allows content providers to offer multiple quality versions from a single encoded video file in order to target different kinds of end-user devices and networks. One form of scalability utilizes the region-of-interest concept, that is, the possibility to mark objects or zones within the video as more important than the surrounding area. The scalable video coder ensures that these regions-of-interest are received by an end-user device before the surrounding area and preferably in higher quality. In this paper, novel algorithms are presented making it possible to automatically track the marked objects in the regions of interest. Our methods detect the overall motion of a designated object by retrieving the motion vectors calculated during the motion estimation step of the video encoder. Using this knowledge, the region-of-interest is translated, thus following the objects within. Furthermore, the proposed algorithms allow adequate resizing of the region-of-interest. By using the available information from the video encoder, object tracking can be done in the compressed domain and is suitable for real-time and streaming applications. A time-complexity analysis is given for the algorithms proving the low complexity thereof and the usability for real-time applications. The proposed object tracking methods are generic and can be applied to any codec that calculates the motion vector field. In this paper, the algorithms are implemented within MPEG-4 fine-granularity scalability codec. Different tests on different video sequences are performed to evaluate the accuracy of the methods. Our novel algorithms achieve a precision up to 96.4 .

  16. Multimedia applications in nursing curriculum: the process of producing streaming videos for medication administration skills.

    Science.gov (United States)

    Sowan, Azizeh K

    2014-07-01

    Streaming videos (SVs) are commonly used multimedia applications in clinical health education. However, there are several negative aspects related to the production and delivery of SVs. Only a few published studies have included sufficient descriptions of the videos and the production process and design innovations. This paper describes the production of innovative SVs for medication administration skills for undergraduate nursing students at a public university in Jordan and focuses on the ethical and cultural issues in producing this type of learning resource. The curriculum development committee approved the modification of educational techniques for medication administration procedures to include SVs within an interactive web-based learning environment. The production process of the videos adhered to established principles for "protecting patients' rights when filming and recording" and included: preproduction, production and postproduction phases. Medication administration skills were videotaped in a skills laboratory where they are usually taught to students and also in a hospital setting with real patients. The lab videos included critical points and Do's and Don'ts and the hospital videos fostered real-world practices. The range of time of the videos was reasonable to eliminate technical difficulty in access. Eight SVs were produced that covered different types of the medication administration skills. The production of SVs required the collaborative efforts of experts in IT, multimedia, nursing and informatics educators, and nursing care providers. Results showed that the videos were well-perceived by students, and the instructors who taught the course. The process of producing the videos in this project can be used as a valuable framework for schools considering utilizing multimedia applications in teaching. Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.

  17. Quality Analysis of Massive High-Definition Video Streaming in Two-Tiered Embedded Camera-Sensing Systems

    OpenAIRE

    Joongheon Kim; Eun-Seok Ryu

    2014-01-01

    This paper presents the quality analysis results of high-definition video streaming in two-tiered camera sensor network applications. In the camera-sensing system, multiple cameras sense visual scenes in their target fields and transmit the video streams via IEEE 802.15.3c multigigabit wireless links. However, the wireless transmission introduces interferences to the other links. This paper analyzes the capacity degradation due to the interference impacts from the camera-sensing nodes to the ...

  18. Evaluation of an interactive web-based nursing course with streaming videos for medication administration skills.

    Science.gov (United States)

    Sowan, Azizeh K; Idhail, Jamila Abu

    2014-08-01

    Nursing students should exhibit competence in nursing skills in order to provide safe and quality patient care. This study describes the design and students' response to an interactive web-based course using streaming video technology tailored to students' needs and the course objectives of the fundamentals of nursing skills clinical course. A mixed-methodology design was used to describe the experience of 102 first-year undergraduate nursing students at a school of nursing in Jordan who were enrolled in the course. A virtual course with streaming videos was designed to demonstrate medication administration fundamental skills. The videos recorded the ideal lab demonstration of the skills, and real-world practice performed by registered nurses for patients in a hospital setting. After course completion, students completed a 30-item satisfaction questionnaire, 8 self-efficacy scales, and a 4-item scale solicited their preferences of using the virtual course as a substitute or a replacement of the lab demonstration. Students' grades in the skill examination of the procedures were measured. Relationships between the main variables and predictors of satisfaction and self-efficacy were examined. Students were satisfied with the virtual course (3.9 ± 0.56, out of a 5-point scale) with a high-perceived overall self-efficacy (4.38 ± 0.42, out of a 5-point scale). Data showed a significant correlation between student satisfaction, self-efficacy and achievement in the virtual course (r = 0.45-0.49, p streaming videos for clinical courses is a complex process that should be carefully designed to positively influence the learning experience. However, the learning benefits gained from such pedagogical approach are worth faculty, institution and students' efforts. Published by Elsevier Ireland Ltd.

  19. Wireless live streaming video of surgical operations: an evaluation of communication quality.

    Science.gov (United States)

    Schneider, Armin; Wilhelm, Dirk; Doll, Dietrich; Rauschenbach, Uwe; Finkenzeller, Michael; Wirnhier, Helga; Illgner, Klaus; Feussner, Hubertus

    2007-01-01

    We evaluated a mobile video system for surgical teleconsultation. A video streaming server in the operating room transmitted video and audio to a hand-held computer (personal digital assistant [PDA]) over a wireless local area network. Two groups of 20 surgeons (each with 12 qualified surgeons and eight surgeons between the 2nd and the 4th year of training) participated in the tests. For voice transmission, correct understanding of numbers was achieved in 100% of the cases (n = 1000) and 98% of medical terms (n = 400). The quality of the video displayed on the PDA was assessed by the recognition of different operating room scenarios. Only 62% (SD 17) of the structures were identified clearly on the hand-held device (n = 400). The accuracy improved to 78% (SD 15) (n = 400) if the same scenario was observed on a larger (50 cm) video screen (p < 0.001). Accuracy was significantly better if audio conversation was possible. The quality evaluation by the consultants showed that the PDA display size and quality were sufficient for clinical use.

  20. QoE-Driven In-Network Optimization for Adaptive Video Streaming Based on Packet Sampling Measurements

    NARCIS (Netherlands)

    Bouten, Niels; de Oliveira Schmidt, R.; Famaey, Jeroen; Latré, Steven; Pras, Aiko; De Turck, Filip

    2015-01-01

    HTTP Adaptive Streaming (HAS) is becoming the de-facto standard for adaptive streaming solutions. In HAS, a video is temporally split into segments which are encoded at different quality rates. The client can then autonomously decide, based on the current buffer filling and network conditions, which

  1. Predictors of valid engagement with a video streaming web study among asian american and non-Hispanic white college students.

    Science.gov (United States)

    Park, Hanjong; Choi, Heeseung; Suarez, Marie L; Zhao, Zhongsheng; Park, Chang; Wilkie, Diana J

    2014-04-01

    The study purpose was to determine the predictors of watching most of a Web-based streaming video and whether data characteristics differed for those watching most or only part of the video. A convenience sample of 650 students (349 Asian Americans and 301 non-Hispanic whites) was recruited from a public university in the United States. Study participants were asked to view a 27-minute suicide awareness streaming video and to complete online questionnaires. Early data monitoring showed many, but not all, watched most of the video. We added software controls to facilitate video completion and defined times for a video completion group (≥26 minutes) and video noncompletion (video noncompletion group, the video completion group included more females, undergraduates, and Asian Americans, and had higher individualistic orientation and more correct manipulation check answers. The video noncompletion group skipped items in a purposeful manner, showed less interest in the video, and spent less time completing questionnaires. The findings suggest that implementing software controls, evaluating missing data patterns, documenting the amount of time spent completing questionnaires, and effective manipulation check questions are essential to control potential bias in Web-based research involving college students.

  2. Digital Videoconferencing: Applications across the Disciplines

    Science.gov (United States)

    Dudding, Carol C.

    2009-01-01

    The purpose of this article is to describe the technologies and applications of digital videoconferencing (DVC) within the realm of communication sciences and disorders. The discussion includes (a) a brief description of videoconferencing, (b) an explanation of the types of DVC available along with the advantages and disadvantages of each, (c)…

  3. Fostering Second Language Oral Communication through Constructivist Interaction in Desktop Videoconferencing

    Science.gov (United States)

    Lee, Lina

    2007-01-01

    This article describes a classroom project using one-to-one desktop videoconferencing to enhance the development of second language (1.2) oral skills. Eighteen university students worked collaboratively with expert speakers to complete task-based activities. The author gathered data from video-recording samples, reflections, and oral interviews to…

  4. A Novel Rate Control Scheme for Constant Bit Rate Video Streaming

    Directory of Open Access Journals (Sweden)

    Venkata Phani Kumar M

    2015-08-01

    Full Text Available In this paper, a novel rate control mechanism is proposed for constant bit rate video streaming. The initial quantization parameter used for encoding a video sequence is determined using the average spatio-temporal complexity of the sequence, its resolution and the target bit rate. Simple linear estimation models are then used to predict the number of bits that would be necessary to encode a frame for a given complexity and quantization parameter. The experimental results demonstrate that our proposed rate control mechanism significantly outperforms the existing rate control scheme in the Joint Model (JM reference software in terms of Peak Signal to Noise Ratio (PSNR and consistent perceptual visual quality while achieving the target bit rate. Furthermore, the proposed scheme is validated through implementation on a miniature test-bed.

  5. Network Degradation Effects on Different Codec Types and Characteristics of Video Streaming

    Directory of Open Access Journals (Sweden)

    Jaroslav Frnda

    2014-01-01

    Full Text Available Nowadays, there is a quickly growing demand for the transmission of voice, video and data over an IP based network. Multimedia, whether we are talking about broadcast, audio and video transmission and others, from a global perspective is growing exponentially with time. With incoming requests from users, new technologies for data transfer are continually developing. Data must be delivered reliably and with the fewest losses at such high speed. Video quality as part of multimedia technology has a very important role nowadays. It is influenced by several factors, where each of them can have many forms and processing. Network performance is the major degradation effect that influences the quality of resulting image. Poor network performance (lack of link capacity, high network load… causes data packet losses or different delivery time for each packet. This work focuses exactly on these network phenomena. It examines the impact of different delays and packet losses on the quality parameters of triple play services, to evaluate the results using objective methods. The aim of this work is to bring a detailed view on the performance of video streaming over IP-based networks.

  6. Combined Wavelet Video Coding and Error Control for Internet Streaming and Multicast

    Science.gov (United States)

    Chu, Tianli; Xiong, Zixiang

    2003-12-01

    This paper proposes an integrated approach to Internet video streaming and multicast (e.g., receiver-driven layered multicast (RLM) by McCanne) based on combined wavelet video coding and error control. We design a packetized wavelet video (PWV) coder to facilitate its integration with error control. The PWV coder produces packetized layered bitstreams that are independent among layers while being embedded within each layer. Thus, a lost packet only renders the following packets in the same layer useless. Based on the PWV coder, we search for a multilayered error-control strategy that optimally trades off source and channel coding for each layer under a given transmission rate to mitigate the effects of packet loss. While both the PWV coder and the error-control strategy are new—the former incorporates embedded wavelet video coding and packetization and the latter extends the single-layered approach for RLM by Chou et al.—the main distinction of this paper lies in the seamless integration of the two parts. Theoretical analysis shows a gain of up to 1 dB on a channel with 20% packet loss using our combined approach over separate designs of the source coder and the error-control mechanism. This is also substantiated by our simulations with a gain of up to 0.6 dB. In addition, our simulations show a gain of up to 2.2 dB over previous results reported by Chou et al.

  7. Rate-Distortion Optimized Frame Dropping for Multiuser Streaming and Conversational Videos

    Directory of Open Access Journals (Sweden)

    Wei Tu

    2008-01-01

    Full Text Available We consider rate-distortion optimized strategies for dropping frames from multiple conversational and streaming videos sharing limited network node resources. The dropping strategies are based on side information that is extracted during encoding and is sent along the regular bitstream. The additional transmission overhead and the computational complexity of the proposed frame dropping schemes are analyzed. Our experimental results show that a significant improvement in end-to-end performance is achieved compared to priority-based random early dropping.

  8. DEFINITION AND ANALYSIS OF MOTION ACTIVITY AFTER-STROKE PATIENT FROM THE VIDEO STREAM

    Directory of Open Access Journals (Sweden)

    M. Yu. Katayev

    2014-01-01

    Full Text Available This article describes an approach to the assessment of motion activity of man in after-stroke period, allowing the doctor to get new information to give a more informed recommendations on rehabilitation treatment than in traditional approaches. Consider description of the hardware-software complex for determination and analysis of motion activity after-stroke patient for the video stream. The article provides a description of the complex, its algorithmic filling and the results of the work on the example of processing of the actual data. The algorithms and technology to significantly accelerate the gait analysis and improve the quality of diagnostics post-stroke patients.

  9. Videostreaming - populární fenomén. Online video není pouze streaming

    OpenAIRE

    Burachovičová, Eva

    2009-01-01

    This diploma thesis aims to provide a general overview of the issue of IP video transmission. First chapter gives in-dept introduction of the technical side of video streaming and online video generally and its functions. The second part presents the main roles of theusers and genres in this field and it also show the main social aspects of the online video technologies. The aim of the third chapter is to refer to the current use of technology and to its possible further usage. In the fourth ...

  10. Encryption for confidentiality of the network and influence of this to the quality of streaming video through network

    Science.gov (United States)

    Sevcik, L.; Uhrin, D.; Frnda, J.; Voznak, M.; Toral-Cruz, Homer; Mikulec, M.; Jakovlev, Sergej

    2015-05-01

    Nowadays, the interest in real-time services, like audio and video, is growing. These services are mostly transmitted over packet networks, which are based on IP protocol. It leads to analyses of these services and their behavior in such networks which are becoming more frequent. Video has become the significant part of all data traffic sent via IP networks. In general, a video service is one-way service (except e.g. video calls) and network delay is not such an important factor as in a voice service. Dominant network factors that influence the final video quality are especially packet loss, delay variation and the capacity of the transmission links. Analysis of video quality concentrates on the resistance of video codecs to packet loss in the network, which causes artefacts in the video. IPsec provides confidentiality in terms of safety, integrity and non-repudiation (using HMAC-SHA1 and 3DES encryption for confidentiality and AES in CBC mode) with an authentication header and ESP (Encapsulating Security Payload). The paper brings a detailed view of the performance of video streaming over an IP-based network. We compared quality of video with packet loss and encryption as well. The measured results demonstrated the relation between the video codec type and bitrate to the final video quality.

  11. Cross-Layer Techniques for Adaptive Video Streaming over Wireless Networks

    Directory of Open Access Journals (Sweden)

    Yufeng Shan

    2005-02-01

    Full Text Available Real-time streaming media over wireless networks is a challenging proposition due to the characteristics of video data and wireless channels. In this paper, we propose a set of cross-layer techniques for adaptive real-time video streaming over wireless networks. The adaptation is done with respect to both channel and data. The proposed novel packetization scheme constructs the application layer packet in such a way that it is decomposed exactly into an integer number of equal-sized radio link protocol (RLP packets. FEC codes are applied within an application packet at the RLP packet level rather than across different application packets and thus reduce delay at the receiver. A priority-based ARQ, together with a scheduling algorithm, is applied at the application layer to retransmit only the corrupted RLP packets within an application layer packet. Our approach combines the flexibility and programmability of application layer adaptations, with low delay and bandwidth efficiency of link layer techniques. Socket-level simulations are presented to verify the effectiveness of our approach.

  12. Cross-Layer Techniques for Adaptive Video Streaming over Wireless Networks

    Science.gov (United States)

    Shan, Yufeng

    2005-12-01

    Real-time streaming media over wireless networks is a challenging proposition due to the characteristics of video data and wireless channels. In this paper, we propose a set of cross-layer techniques for adaptive real-time video streaming over wireless networks. The adaptation is done with respect to both channel and data. The proposed novel packetization scheme constructs the application layer packet in such a way that it is decomposed exactly into an integer number of equal-sized radio link protocol (RLP) packets. FEC codes are applied within an application packet at the RLP packet level rather than across different application packets and thus reduce delay at the receiver. A priority-based ARQ, together with a scheduling algorithm, is applied at the application layer to retransmit only the corrupted RLP packets within an application layer packet. Our approach combines the flexibility and programmability of application layer adaptations, with low delay and bandwidth efficiency of link layer techniques. Socket-level simulations are presented to verify the effectiveness of our approach.

  13. Joint Optimized CPU and Networking Control Scheme for Improved Energy Efficiency in Video Streaming on Mobile Devices

    Directory of Open Access Journals (Sweden)

    Sung-Woong Jo

    2017-01-01

    Full Text Available Video streaming service is one of the most popular applications for mobile users. However, mobile video streaming services consume a lot of energy, resulting in a reduced battery life. This is a critical problem that results in a degraded user’s quality of experience (QoE. Therefore, in this paper, a joint optimization scheme that controls both the central processing unit (CPU and wireless networking of the video streaming process for improved energy efficiency on mobile devices is proposed. For this purpose, the energy consumption of the network interface and CPU is analyzed, and based on the energy consumption profile a joint optimization problem is formulated to maximize the energy efficiency of the mobile device. The proposed algorithm adaptively adjusts the number of chunks to be downloaded and decoded in each packet. Simulation results show that the proposed algorithm can effectively improve the energy efficiency when compared with the existing algorithms.

  14. New architecture for MPEG video streaming system with backward playback support.

    Science.gov (United States)

    Fu, Chang-Hong; Chan, Yui-Lam; Ip, Tak-Piu; Siu, Wan-Chi

    2007-09-01

    MPEG digital video is becoming ubiquitous for video storage and communications. It is often desirable to perform various video cassette recording (VCR) functions such as backward playback in MPEG videos. However, the predictive processing techniques employed in MPEG severely complicate the backward-play operation. A straightforward implementation of backward playback is to transmit and decode the whole group-of-picture (GOP), store all the decoded frames in the decoder buffer, and play the decoded frames in reverse order. This approach requires a significant buffer in the decoder, which depends on the GOP size, to store the decoded frames. This approach could not be possible in a severely constrained memory requirement. Another alternative is to decode the GOP up to the current frame to be displayed, and then go back to decode the GOP again up to the next frame to be displayed. This approach does not need the huge buffer, but requires much higher bandwidth of the network and complexity of the decoder. In this paper, we propose a macroblock-based algorithm for an efficient implementation of the MPEG video streaming system to provide backward playback over a network with the minimal requirements on the network bandwidth and the decoder complexity. The proposed algorithm classifies macroblocks in the requested frame into backward macroblocks (BMBs) and forward/backward macroblocks (FBMBs). Two macroblock-based techniques are used to manipulate different types of macroblocks in the compressed domain and the server then sends the processed macroblocks to the client machine. For BMBs, a VLC-domain technique is adopted to reduce the number of macroblocks that need to be decoded by the decoder and the number of bits that need to be sent over the network in the backward-play operation. We then propose a newly mixed VLC/DCT-domain technique to handle FBMBs in order to further reduce the computational complexity of the decoder. With these compressed-domain techniques, the

  15. A Video Game Platform for Exploring Satellite and In-Situ Data Streams

    Science.gov (United States)

    Cai, Y.

    2014-12-01

    Exploring spatiotemporal patterns of moving objects are essential to Earth Observation missions, such as tracking, modeling and predicting movement of clouds, dust, plumes and harmful algal blooms. Those missions involve high-volume, multi-source, and multi-modal imagery data analysis. Analytical models intend to reveal inner structure, dynamics, and relationship of things. However, they are not necessarily intuitive to humans. Conventional scientific visualization methods are intuitive but limited by manual operations, such as area marking, measurement and alignment of multi-source data, which are expensive and time-consuming. A new development of video analytics platform has been in progress, which integrates the video game engine with satellite and in-situ data streams. The system converts Earth Observation data into articulated objects that are mapped from a high-dimensional space to a 3D space. The object tracking and augmented reality algorithms highlight the objects' features in colors, shapes and trajectories, creating visual cues for observing dynamic patterns. The head and gesture tracker enable users to navigate the data space interactively. To validate our design, we have used NASA SeaWiFS satellite images of oceanographic remote sensing data and NOAA's in-situ cell count data. Our study demonstrates that the video game system can reduce the size and cost of traditional CAVE systems in two to three orders of magnitude. This system can also be used for satellite mission planning and public outreaching.

  16. Empirical evaluation of H.265/HEVC-based dynamic adaptive video streaming over HTTP (HEVC-DASH)

    Science.gov (United States)

    Irondi, Iheanyi; Wang, Qi; Grecos, Christos

    2014-05-01

    Real-time HTTP streaming has gained global popularity for delivering video content over Internet. In particular, the recent MPEG-DASH (Dynamic Adaptive Streaming over HTTP) standard enables on-demand, live, and adaptive Internet streaming in response to network bandwidth fluctuations. Meanwhile, emerging is the new-generation video coding standard, H.265/HEVC (High Efficiency Video Coding) promises to reduce the bandwidth requirement by 50% at the same video quality when compared with the current H.264/AVC standard. However, little existing work has addressed the integration of the DASH and HEVC standards, let alone empirical performance evaluation of such systems. This paper presents an experimental HEVC-DASH system, which is a pull-based adaptive streaming solution that delivers HEVC-coded video content through conventional HTTP servers where the client switches to its desired quality, resolution or bitrate based on the available network bandwidth. Previous studies in DASH have focused on H.264/AVC, whereas we present an empirical evaluation of the HEVC-DASH system by implementing a real-world test bed, which consists of an Apache HTTP Server with GPAC, an MP4Client (GPAC) with open HEVC-based DASH client and a NETEM box in the middle emulating different network conditions. We investigate and analyze the performance of HEVC-DASH by exploring the impact of various network conditions such as packet loss, bandwidth and delay on video quality. Furthermore, we compare the Intra and Random Access profiles of HEVC coding with the Intra profile of H.264/AVC when the correspondingly encoded video is streamed with DASH. Finally, we explore the correlation among the quality metrics and network conditions, and empirically establish under which conditions the different codecs can provide satisfactory performance.

  17. Combined Wavelet Video Coding and Error Control for Internet Streaming and Multicast

    Directory of Open Access Journals (Sweden)

    Tianli Chu

    2003-01-01

    Full Text Available This paper proposes an integrated approach to Internet video streaming and multicast (e.g., receiver-driven layered multicast (RLM by McCanne based on combined wavelet video coding and error control. We design a packetized wavelet video (PWV coder to facilitate its integration with error control. The PWV coder produces packetized layered bitstreams that are independent among layers while being embedded within each layer. Thus, a lost packet only renders the following packets in the same layer useless. Based on the PWV coder, we search for a multilayered error-control strategy that optimally trades off source and channel coding for each layer under a given transmission rate to mitigate the effects of packet loss. While both the PWV coder and the error-control strategy are new—the former incorporates embedded wavelet video coding and packetization and the latter extends the single-layered approach for RLM by Chou et al.—the main distinction of this paper lies in the seamless integration of the two parts. Theoretical analysis shows a gain of up to 1 dB on a channel with 20% packet loss using our combined approach over separate designs of the source coder and the error-control mechanism. This is also substantiated by our simulations with a gain of up to 0.6 dB. In addition, our simulations show a gain of up to 2.2 dB over previous results reported by Chou et al.

  18. Next Generation High Quality Videoconferencing Service for the LHC

    CERN Multimedia

    CERN. Geneva

    2012-01-01

    In recent times, we have witnessed an explosion of video initiatives in the industry worldwide. Several advancements in video technology are currently improving the way we interact and collaborate. These advancements are forcing tendencies and overall experiences: any device in any network can be used to collaborate, in most cases with an overall high quality. To cope with this technology progresses, CERN IT Department has taken the leading role to establish strategies and directions to improve the user experience in remote dispersed meetings and remote collaboration at large in the worldwide LHC communities. Due to the high rate of dispersion in the LHC user communities, these are critically dependent of videoconferencing technology, with a need of robustness and high quality for the best possible user experience. We will present an analysis of the factors that influenced the technical and strategic choices to improve the reliability, efficiency and overall quality of the LHC remote sessions. In particular, ...

  19. Scalable Video Streaming for Single-Hop Wireless Networks Using a Contention-Based Access MAC Protocol

    Directory of Open Access Journals (Sweden)

    Monchai Lertsutthiwong

    2008-07-01

    Full Text Available Limited bandwidth and high packet loss rate pose a serious challenge for video streaming applications over wireless networks. Even when packet loss is not present, the bandwidth fluctuation, as a result of an arbitrary number of active flows in an IEEE 802.11 network, can significantly degrade the video quality. This paper aims to enhance the quality of video streaming applications in wireless home networks via a joint optimization of video layer-allocation technique, admission control algorithm, and medium access control (MAC protocol. Using an Aloha-like MAC protocol, we propose a novel admission control framework, which can be viewed as an optimization problem that maximizes the average quality of admitted videos, given a specified minimum video quality for each flow. We present some hardness results for the optimization problem under various conditions and propose some heuristic algorithms for finding a good solution. In particular, we show that a simple greedy layer-allocation algorithm can perform reasonably well, although it is typically not optimal. Consequently, we present a more expensive heuristic algorithm that guarantees to approximate the optimal solution within a constant factor. Simulation results demonstrate that our proposed framework can improve the video quality up to 26% as compared to those of the existing approaches.

  20. Streaming video-based 3D reconstruction method compatible with existing monoscopic and stereoscopic endoscopy systems

    Science.gov (United States)

    Bouma, Henri; van der Mark, Wannes; Eendebak, Pieter T.; Landsmeer, Sander H.; van Eekeren, Adam W. M.; ter Haar, Frank B.; Wieringa, F. Pieter; van Basten, Jean-Paul

    2012-06-01

    Compared to open surgery, minimal invasive surgery offers reduced trauma and faster recovery. However, lack of direct view limits space perception. Stereo-endoscopy improves depth perception, but is still restricted to the direct endoscopic field-of-view. We describe a novel technology that reconstructs 3D-panoramas from endoscopic video streams providing a much wider cumulative overview. The method is compatible with any endoscope. We demonstrate that it is possible to generate photorealistic 3D-environments from mono- and stereoscopic endoscopy. The resulting 3D-reconstructions can be directly applied in simulators and e-learning. Extended to real-time processing, the method looks promising for telesurgery or other remote vision-guided tasks.

  1. Inexpensive, realtime tele-ultrasound using a commercial, web-based video streaming device.

    Science.gov (United States)

    Paulus, Yannis M; Thompson, Noel P

    2012-06-01

    We have devised an inexpensive, web-based tele-ultrasound system using commercially-available video streaming equipment. We examined the spatial and grey scale resolution, and the delay time of the system. The receiving PC was tested at various distances from the transmitting site, from 3.2 km to 4828 km. Standard resolution targets and echocardiography movie strips recorded on DVDs were used to assess the image quality. A qualitative assessment was made by an expert sonographer. As the distance between the transmitter and the receiver increased, the scan smoothness decreased and the delay increased. At a distance of 3.2 km the delay was 2-3 s, and at 4828 km it was 10-15 s. The delay was short enough to allow realtime guidance of the scanning technician by telephone. The system allows inexpensive, readily available, realtime tele-ultrasonography.

  2. Performance Analysis of Multicast Video Streaming in IEEE 802.11 b/g/n Testbed Environment

    Science.gov (United States)

    Kostuch, Aleksander; Gierłowski, Krzysztof; Wozniak, Jozef

    The aim of the work is to analyse capabilities and limitations of different IEEE 802.11 technologies (IEEE 802.11 b/g/n), utilized for both multicast and unicast video streaming transmissions directed to mobile devices. Our preliminary research showed that results obtained with currently popular simulation tools can be drastically different than these possible in real-world environment, so, in order to correctly evaluate performance of video streaming, a simple wireless test-bed infrastructure has been created. The results show a strong dependence of the quality of video streaming on the chosen transmission technology. At the same time there are significant differences in perception quality between multicast (1:n) and unicast (1:1) streams, and also between devices offered by different manufacturers. The overall results seem to demonstrate, that, while multicast support quality in different products is still varied and often requires additional configuration, it is possible to select a WiFi access point model and determine the best system parameters to ensure a good video transfer conditions in terms of acceptable QoP/E (Quality of Perception/Exellence).

  3. The Real Time Remote Motion Control of Two Wheeled Mobile Balance Robot by Using Video Streaming

    Directory of Open Access Journals (Sweden)

    Ali Unluturk

    2016-01-01

    Full Text Available This study presents the motion control of a real time two wheeled balance robot capable of moving back and forward, turning right and left and video streaming via IP (Internet Protocol camera on it. A C++ based visual user interface is created on PC (Personal Computer in order to control of the designed Two Wheeled Mobile Balance Robot (TWMBR. By means of the interface, all controller parameters of the robot can be changed via wireless communication module on it. Moreover, the robot’s tilt angle with respect to time, linear displacement and controller output can be observed simultaneously. Within the robot control interface, the videos from IP camera is transferred into the operator screen via TCP/IP (Transmission Control Protocol/Internet Protocol communication protocol. So, the robot can be controlled via arrow keys and visual interface on PC remotely by an operator. Acceleration and gyro sensors are fused by means of a real-time Kalman Filter so that robot can keep its balance in both moving and stable state in the designed system. Thus, an accurate tilt angle control is realized. Classic PID (Proportional-Integral-Derivative algorithm is used as robot controller. In conclusion, via IP camera on the robot, the real-time motion control is performed and data diagrams about motion control are obtained.

  4. FaceTime validation study: Low-cost streaming video for cytology adequacy assessment.

    Science.gov (United States)

    Agarwal, Shweta; Zhao, Lichao; Zhang, Roy; Hassell, Lewis

    2016-03-01

    Adequacy assessment for fine-needle aspiration procedures is a standard of care in large medical centers. Although the benefits of this approach include higher adequacy rates with fewer passes, it costs cytopathologist time and affects other clinical responsibilities. The objective of the current study was to evaluate the use of mobile video streaming (FaceTime) technology with the help of smartphone adapters attached to microscopes for remote adequacy assessment of cytologic samples. The study consisted of 2 phases: Phase 1 was a retrospective assessment of 25 samples by a primary pathologist with simultaneous streaming to a second pathologist using a smartphone (iPhone/iPad) FaceTime connection. Data on the adequacy of each sample and preliminary diagnoses were recorded. In phase 2, live cases were assessed prospectively by an onsite primary pathologist and by a remote pathologist using an iPhone/iPad-FaceTime connection. The testing phase involved prospective assessment of additional samples with a resident or cytotechnologist as the slide driver. In phase 1, retrospective evaluation of 25 samples yielded considerable agreement (22 of 25 samples; 88%) between onsite and remote adequacy assessments. Three samples (12%) yielded results that did not agree, including 2 samples that were read as adequate in the onsite evaluation that were assessed as indeterminate using FaceTime. In phase 2 and in the testing phase, 14 samples exhibited considerable agreement on both adequacy and preliminary diagnosis (6 samples in phase 2 and 8 samples in the testing phase) and are currently available for reporting. Problems encountered include software version standardization, camera alignment, and (rarely) comprehension of the audio stream. The current data indicate that iPhone/iPad FaceTime technology can be used to perform remote adequacy assessments of fine-needle aspirations and can help save valuable time for pathologists. © 2015 American Cancer Society.

  5. A QoE Aware Fairness Bi-level Resource Allocation Algorithm for Multiple Video Streaming in WLAN

    Directory of Open Access Journals (Sweden)

    Hu Zhou

    2015-11-01

    Full Text Available With the increasing of smart devices such as mobile phones and tablets, the scenario of multiple video users watching video streaming simultaneously in one wireless local area network (WLAN becomes more and more popular. However, the quality of experience (QoE and the fairness among multiple users are seriously impacted by the limited bandwidth and shared resources of WLAN. In this paper, we propose a novel bi-level resource allocation algorithm. To maximize the total throughput of the network, the WLAN is firstly tuned to the optimal operation point. Then the wireless resource is carefully allocated at the first level, i.e., between AP and uplink background traffic users, and the second level, i.e., among downlink video users. The simulation results show that the proposed algorithm can guarantee the QoE and the fairness for all the video users, and there is little impact on the average throughput of the background traffic users.

  6. Treating childhood depression over videoconferencing.

    Science.gov (United States)

    Nelson, Eve-Lynn; Barnard, Martha; Cain, Sharon

    2003-01-01

    Effective cognitive-behavioral treatments for childhood depression have developed over the last decade, but many families face barriers to such care. Telemedicine increases access to psychological interventions by linking the child and the clinician using videoconferencing (VC). The current study evaluated an 8-week, cognitive-behavioral therapy (CBT) intervention for childhood depression either face-to-face (F2F) or over VC. The telemedicine setup included two PC-based PictureTel systems at 128 kilibits per second (kbps). Success was defined by (1) decreasing depressive symptoms at similar rates in both the VC group and the F2F group and (2) demonstrating the feasibility of a randomized controlled trial in telemental health. Children were assessed for childhood depression using the mood section of the Schedule for Affective Disorders and Schizophrenia for School Age Children-Present Episode (K-SADS-P). Twenty-eight children were randomized to either F2F or VC treatment. The participants completed the K-SADS-P and the Children's Depression Inventory (CDI) at pre- and post-treatment. The CBT treatment across the two conditions was effective. The overall response rate based on post-evaluation with the K-SADS-P was 82%. For the CDI total score, both the Time and the Group by Time effects were significant (p interaction effect reflected a faster rate of decline in the CDI total score for the VC group. The study serves as a model for building on past research to implement a randomized controlled trial. This information provides persuasive research data concerning treatment effectiveness for clinicians, families, and funders.

  7. An Analysis of Quality of Service (QoS In Live Video Streaming Using Evolved HSPA Network Media

    Directory of Open Access Journals (Sweden)

    Achmad Zakaria Azhar

    2016-10-01

    Full Text Available Evolved High Speed Packet Access (HSPA+ is a mobile telecommunication system technology and the evolution of HSPA technology. This technology has a packet data based service with downlink speeds up to 21.1 Mbps and uplink speed up to 11.5 Mbps on the bandwidth 5MHz. This technology is expected to fulfill and support the needs for information that involves all aspects of multimedia such as video and audio, especially live video streaming. By utilizing this technology it will facilitate communicating the information, for example to monitoring the situation of the house, the news coverage at some certain area, and other events in real time. This thesis aims to identify and test the Quality of Service (QoS performance on the network that is used for live video streaming with the parameters of throughput, delay, jitter and packet loss. The software used for monitoring the data traffic of the live video streaming network is wireshark network analyzer. From the test results it is obtained that the average throughput of provider B is 5,295 Kbps bigger than the provider A, the average delay of provider B is 0.618 ms smaller than the provider A, the average jitter of provider B is 0.420 ms smaller than the provider A and the average packet loss of provider B is 0.451% smaller than the provider A.

  8. Real-time Video-Streaming to Surgical Loupe Mounted Head-Up Display for Navigated Meningioma Resection.

    Science.gov (United States)

    Diaz, Roberto; Yoon, Jang; Chen, Robert; Quinones-Hinojosa, Alfredo; Wharen, Robert; Komotar, Ricardo

    2017-04-30

    Wearable technology interfaces with normal human movement and function, thereby enabling more efficient and adaptable use.We developed a wearable display system for use with intra-operative neuronavigation for brain tumor surgery. The Google glass head-up display system was adapted to surgical loupes with a video-streaming integrated hardware and software device for display of the Stealth S7 navigation screen. Phantom trials of surface ventriculostomy were performed. The device was utilized as an alternative display screen during cranial surgery. Image-guided brain tumor resection was accomplished using Google Glass head-up display of Stealth S7 navigation images. Visual display consists of navigation video-streaming over a wireless network. The integrated system developed for video-streaming permits video data display to the operating surgeon without requiring movement of the head away from the operative field. Google Glass head-up display can be used for intra-operative neuronavigation in the setting of intracranial tumor resection.

  9. Detailed Performance and Waiting-Time Predictability Analysis of Scheduling Options in On-Demand Video Streaming

    Directory of Open Access Journals (Sweden)

    Alsmirat MohammadA

    2010-01-01

    Full Text Available The number of on-demand video streams that can be supported concurrently is highly constrained by the stringent requirements of real-time playback and high transfer rates. To address this problem, stream merging techniques utilize the multicast facility to increase resource sharing. The achieved resource sharing depends greatly on how the waiting requests are scheduled for service. We investigate the effectiveness of the recently proposed cost-based scheduling in detail and analyze opportunities for further tunings and enhancements. In particular, we analyze alternative ways to compute the delivery cost. In addition, we propose a new scheduling policy, called Predictive Cost-Based Scheduling (PCS, which applies a prediction algorithm to predict future scheduling decisions and then uses the prediction results to potentially alter its current scheduling decisions. Moreover, we propose an enhancement technique, called Adaptive Regular Stream Triggering (ART, which significantly enhances stream merging behavior by selectively delaying the initiation of full-length video streams. We analyze the effectiveness of the proposed strategies in terms of their performance effectiveness and impacts on waiting-time predictability through extensive simulation. The results show that significant performance benefits as well as better waiting-time predictability can be attained.

  10. Uncompressed high-definition videoconferencing tools for telemedicine and distance learning.

    Science.gov (United States)

    Zhang, Kai; Liu, Wei-Li; Locatis, Craig; Ackerman, Michael

    2013-08-01

    Uncompressed high-definition (HD) video image quality is superior to compressed HD video provided in most commercially available videoconferencing products. Uncompressed HD videoconferencing tools provide a more immersive experience because there is no reduction of image information and, in most cases, lower latency. Four open source uncompressed video applications are reviewed that have been tested at the National Library of Medicine: three transmitting uncompressed HD video and one transmitting loosely compressed standard-definition video. The technical requirements for implementing each are described, and test results in terms of image quality, latency, and application reliability are presented. Because the hardware and bandwidth requirements for uncompressed HD video are relatively high and most applications are still under development, they are generally not ready for mass deployment. Some are, however, ready for pilot testing and experimentation in clinical settings by either those who have or anticipate having bandwidth sufficient to support them or those interested in researching the effects higher-quality video may have on diagnostic and other clinical outcomes.

  11. Cross-layer ultrasound video streaming over mobile WiMAX and HSUPA networks.

    Science.gov (United States)

    Alinejad, Ali; Philip, Nada Y; Istepanian, Robert S H

    2012-01-01

    It is well known that the evolution of 4G-based mobile multimedia network systems will contribute significantly to future mobile healthcare (m-health) applications that require high bandwidth and fast data rates. Central to the success of such emerging applications is the compatibility of broadband networks, such as mobile Worldwide Interoperability For Microwave Access (WiMAX) and High-Speed Uplink Packet Access (HSUPA), and especially their rate adaption issues combined with the acceptable real-time medical quality of service requirements. In this paper, we address the relevant challenges of cross-layer design requirements for real-time rate adaptation of ultrasound video streaming in mobile WiMAX and HSUPA networks. A comparative performance analysis of such approach is validated in two experimental m-health test bed systems for both mobile WiMAX and HSUPA networks. The experimental results have shown an improved performance of mobile WiMAX compared to the HSUPA using the same cross-layer optimization approach.

  12. Tunneling Horizontal IEC 61850 Traffic through Audio Video Bridging Streams for Flexible Microgrid Control and Protection

    Directory of Open Access Journals (Sweden)

    Michael Short

    2016-03-01

    Full Text Available In this paper, it is argued that some low-level aspects of the usual IEC 61850 mapping to Ethernet are not well suited to microgrids due to their dynamic nature and geographical distribution as compared to substations. It is proposed that the integration of IEEE time-sensitive networking (TSN concepts (which are currently implemented as audio video bridging (AVB technologies within an IEC 61850 / Manufacturing Message Specification framework provides a flexible and reconfigurable platform capable of overcoming such issues. A prototype test platform and bump-in-the-wire device for tunneling horizontal traffic through AVB are described. Experimental results are presented for sending IEC 61850 GOOSE (generic object oriented substation events and SV (sampled values messages through AVB tunnels. The obtained results verify that IEC 61850 event and sampled data may be reliably transported within the proposed framework with very low latency, even over a congested network. It is argued that since AVB streams can be flexibly configured from one or more central locations, and bandwidth reserved for their data ensuring predictability of delivery, this gives a solution which seems significantly more reliable than a pure MMS-based solution.

  13. Fragility issues of medical video streaming over 802.11e-WLAN m-health environments.

    Science.gov (United States)

    Tan, Yow-Yiong Edwin; Philip, Nada; Istepanian, Robert H

    2006-01-01

    This paper presents some of the fragility issues of a medical video streaming over 802.11e-WLAN in m-health applications. In particular, we present a medical channel-adaptive fair allocation (MCAFA) scheme for enhanced QoS support for IEEE 802.11 (WLAN), as a modification for the standard 802.11e enhanced distributed coordination function (EDCF) is proposed for enhanced medical data performance. The medical channel-adaptive fair allocation (MCAFA) proposed extends the EDCF, by halving the contention window (CW) after zeta consecutive successful transmissions to reduce the collision probability when channel is busy. Simulation results show that MCAFA outperforms EDCF in-terms of overall performance relevant to the requirements of high throughput of medical data and video streaming traffic in 3G/WLAN wireless environments.

  14. Unequal Protection of Video Streaming through Adaptive Modulation with a Trizone Buffer over Bluetooth Enhanced Data Rate

    Directory of Open Access Journals (Sweden)

    Rouzbeh Razavi

    2007-12-01

    Full Text Available Bluetooth enhanced data rate wireless channel can support higher-quality video streams compared to previous versions of Bluetooth. Packet loss when transmitting compressed data has an effect on the delivered video quality that endures over multiple frames. To reduce the impact of radio frequency noise and interference, this paper proposes adaptive modulation based on content type at the video frame level and content importance at the macroblock level. Because the bit rate of protected data is reduced, the paper proposes buffer management to reduce the risk of buffer overflow. A trizone buffer is introduced, with a varying unequal protection policy in each zone. Application of this policy together with adaptive modulation results in up to 4 dB improvement in objective video quality compared to fixed rate scheme for an additive white Gaussian noise channel and around 10 dB for a Gilbert-Elliott channel. The paper also reports a consistent improvement in video quality over a scheme that adapts to channel conditions by varying the data rate without accounting for the video frame packet type or buffer congestion.

  15. Unequal Protection of Video Streaming through Adaptive Modulation with a Trizone Buffer over Bluetooth Enhanced Data Rate

    Directory of Open Access Journals (Sweden)

    Razavi Rouzbeh

    2008-01-01

    Full Text Available Abstract Bluetooth enhanced data rate wireless channel can support higher-quality video streams compared to previous versions of Bluetooth. Packet loss when transmitting compressed data has an effect on the delivered video quality that endures over multiple frames. To reduce the impact of radio frequency noise and interference, this paper proposes adaptive modulation based on content type at the video frame level and content importance at the macroblock level. Because the bit rate of protected data is reduced, the paper proposes buffer management to reduce the risk of buffer overflow. A trizone buffer is introduced, with a varying unequal protection policy in each zone. Application of this policy together with adaptive modulation results in up to 4 dB improvement in objective video quality compared to fixed rate scheme for an additive white Gaussian noise channel and around 10 dB for a Gilbert-Elliott channel. The paper also reports a consistent improvement in video quality over a scheme that adapts to channel conditions by varying the data rate without accounting for the video frame packet type or buffer congestion.

  16. GOP-based channel rate allocation using genetic algorithm for scalable video streaming over error-prone networks.

    Science.gov (United States)

    Fang, Tao; Chau, Lap-Pui

    2006-06-01

    In this paper, we address the problem of unequal error protection (UEP) for scalable video transmission over wireless packet-erasure channel. Unequal amounts of protection are allocated to the different frames (I- or P-frame) of a group-of-pictures (GOP), and in each frame, unequal amounts of protection are allocated to the progressive bit-stream of scalable video to provide a graceful degradation of video quality as packet loss rate varies. We use a genetic algorithm (GA) to quickly get the allocation pattern, which is hard to get with other conventional methods, like hill-climbing method. Theoretical analysis and experimental results both demonstrate the advantage of the proposed algorithm.

  17. Real-time skin feature identification in a time-sequential video stream

    Science.gov (United States)

    Kramberger, Iztok

    2005-04-01

    Skin color can be an important feature when tracking skin-colored objects. Particularly this is the case for computer-vision-based human-computer interfaces (HCI). Humans have a highly developed feeling of space and, therefore, it is reasonable to support this within intelligent HCI, where the importance of augmented reality can be foreseen. Joining human-like interaction techniques within multimodal HCI could, or will, gain a feature for modern mobile telecommunication devices. On the other hand, real-time processing plays an important role in achieving more natural and physically intuitive ways of human-machine interaction. The main scope of this work is the development of a stereoscopic computer-vision hardware-accelerated framework for real-time skin feature identification in the sense of a single-pass image segmentation process. The hardware-accelerated preprocessing stage is presented with the purpose of color and spatial filtering, where the skin color model within the hue-saturation-value (HSV) color space is given with a polyhedron of threshold values representing the basis of the filter model. An adaptive filter management unit is suggested to achieve better segmentation results. This enables the adoption of filter parameters to the current scene conditions in an adaptive way. Implementation of the suggested hardware structure is given at the level of filed programmable system level integrated circuit (FPSLIC) devices using an embedded microcontroller as their main feature. A stereoscopic clue is achieved using a time-sequential video stream, but this shows no difference for real-time processing requirements in terms of hardware complexity. The experimental results for the hardware-accelerated preprocessing stage are given by efficiency estimation of the presented hardware structure using a simple motion-detection algorithm based on a binary function.

  18. MATIN: a random network coding based framework for high quality peer-to-peer live video streaming.

    Science.gov (United States)

    Barekatain, Behrang; Khezrimotlagh, Dariush; Aizaini Maarof, Mohd; Ghaeini, Hamid Reza; Salleh, Shaharuddin; Quintana, Alfonso Ariza; Akbari, Behzad; Cabrera, Alicia Triviño

    2013-01-01

    In recent years, Random Network Coding (RNC) has emerged as a promising solution for efficient Peer-to-Peer (P2P) video multicasting over the Internet. This probably refers to this fact that RNC noticeably increases the error resiliency and throughput of the network. However, high transmission overhead arising from sending large coefficients vector as header has been the most important challenge of the RNC. Moreover, due to employing the Gauss-Jordan elimination method, considerable computational complexity can be imposed on peers in decoding the encoded blocks and checking linear dependency among the coefficients vectors. In order to address these challenges, this study introduces MATIN which is a random network coding based framework for efficient P2P video streaming. The MATIN includes a novel coefficients matrix generation method so that there is no linear dependency in the generated coefficients matrix. Using the proposed framework, each peer encapsulates one instead of n coefficients entries into the generated encoded packet which results in very low transmission overhead. It is also possible to obtain the inverted coefficients matrix using a bit number of simple arithmetic operations. In this regard, peers sustain very low computational complexities. As a result, the MATIN permits random network coding to be more efficient in P2P video streaming systems. The results obtained from simulation using OMNET++ show that it substantially outperforms the RNC which uses the Gauss-Jordan elimination method by providing better video quality on peers in terms of the four important performance metrics including video distortion, dependency distortion, End-to-End delay and Initial Startup delay.

  19. MATIN: a random network coding based framework for high quality peer-to-peer live video streaming.

    Directory of Open Access Journals (Sweden)

    Behrang Barekatain

    Full Text Available In recent years, Random Network Coding (RNC has emerged as a promising solution for efficient Peer-to-Peer (P2P video multicasting over the Internet. This probably refers to this fact that RNC noticeably increases the error resiliency and throughput of the network. However, high transmission overhead arising from sending large coefficients vector as header has been the most important challenge of the RNC. Moreover, due to employing the Gauss-Jordan elimination method, considerable computational complexity can be imposed on peers in decoding the encoded blocks and checking linear dependency among the coefficients vectors. In order to address these challenges, this study introduces MATIN which is a random network coding based framework for efficient P2P video streaming. The MATIN includes a novel coefficients matrix generation method so that there is no linear dependency in the generated coefficients matrix. Using the proposed framework, each peer encapsulates one instead of n coefficients entries into the generated encoded packet which results in very low transmission overhead. It is also possible to obtain the inverted coefficients matrix using a bit number of simple arithmetic operations. In this regard, peers sustain very low computational complexities. As a result, the MATIN permits random network coding to be more efficient in P2P video streaming systems. The results obtained from simulation using OMNET++ show that it substantially outperforms the RNC which uses the Gauss-Jordan elimination method by providing better video quality on peers in terms of the four important performance metrics including video distortion, dependency distortion, End-to-End delay and Initial Startup delay.

  20. Remote presence proctoring by using a wireless remote-control videoconferencing system.

    Science.gov (United States)

    Smith, C Daniel; Skandalakis, John E

    2005-06-01

    Remote presence in an operating room to allow an experienced surgeon to proctor a surgeon has been promised through robotics and telesurgery solutions. Although several such systems have been developed and commercialized, little progress has been made using telesurgery for anything more than live demonstrations of surgery. This pilot project explored the use of a new videoconferencing capability to determine if it offers advantages over existing systems. The video conferencing system used is a PC-based system with a flat screen monitor and an attached camera that is then mounted on a remotely controlled platform. This device is controlled from a remotely placed PC-based videoconferencing system computer outfitted with a joystick. Using the public Internet and a wireless router at the client site, a surgeon at the control station can manipulate the videoconferencing system. Controls include navigating the unit around the room and moving the flat screen/camera portion like a head looking up/down and right/left. This system (InTouch Medical, Santa Barbara, CA) was used to proctor medical students during an anatomy class cadaver dissection. The ability of the remote surgeon to effectively monitor the students' dissections and direct their activities was assessed subjectively by students and surgeon. This device was very effective at providing a controllable and interactive presence in the anatomy lab. Students felt they were interacting with a person rather than a video screen and quickly forgot that the surgeon was not in the room. The ability to move the device within the environment rather than just observe the environment from multiple fixed camera angles gave the surgeon a similar feel of true presence. A remote-controlled videoconferencing system provides a more real experience for both student and proctor. Future development of such a device could greatly facilitate progress in implementation of remote presence proctoring.

  1. Evaluating the use of streaming video to support student learning in a first-year life sciences course for student nurses.

    Science.gov (United States)

    Green, Sue M; Voegeli, David; Harrison, Maureen; Phillips, Jackie; Knowles, Jess; Weaver, Mike; Shephard, Kerry

    2003-05-01

    Streaming video was used to support the learning of first year student nurses on a Life Sciences module, as one of many innovations designed to increase the range of resources and support available to students. This paper describes the background to this innovation, the procedures adopted and the results of extensive evaluation. The use of streaming video was evaluated in three applications in the module. A total of 656 students used online directed-learning sessions that incorporated streamed video. Just over half of these students actually viewed the video streams. Their feedback showed that 32% found access easy, 59% enjoyed using the resources, and 25% were very confident that they learned from them. Different types of video were used, and embedded in diverse ways, but the results were consistent across the three applications. They suggest that streamed video can contribute to useful resources to support learning by student nurses but, for a variety of reasons, it may not appeal or be adequately accessible to all students at present.

  2. Global Interoperability of High Definition Video Streams Via ACTS and Intelsat

    Science.gov (United States)

    Hsu, Eddie; Wang, Charles; Bergman, Larry; Pearman, James; Bhasin, Kul; Clark, Gilbert; Shopbell, Patrick; Gill, Mike; Tatsumi, Haruyuki; Kadowaki, Naoto

    2000-01-01

    In 1993, a proposal at the Japan.-U.S. Cooperation in Space Program Workshop lead to a subsequent series of satellite communications experiments and demonstrations, under the title of Trans-Pacific High Data Rate Satellite Communications Experiments. The first of which is a joint collaboration between government and industry teams in the United States and Japan that successfully demonstrated distributed high definition video (HDV) post-production on a global scale using a combination of high data rate satellites and terrestrial fiber optic asynchronous transfer mode (ATM) networks. The HDV experiment is the first GIBN experiment to establish a dual-hop broadband satellite link for the transmission of digital HDV over ATM. This paper describes the team's effort in using the NASA Advanced Communications Technology Satellite (ACTS) at rates up to OC-3 (155 Mbps) between Los Angeles and Honolulu, and using Intelsat at rates up to DS-3 (45 Mbps) between Kapolei and Tokyo, with which HDV source material was transmitted between Sony Pictures High Definition Center (SPHDC) in Los Angeles and Sony Visual Communication Center (VCC) in Shinagawa, Tokyo. The global-scale connection also used terrestrial networks in Japan, the States of Hawaii and California. The 1.2 Gbps digital HDV stream was compressed down to 22.5 Mbps using a proprietary Mitsubishi MPEG-2 codec that was ATM AAL-5 compatible. The codec: employed four-way parallel processing. Improved versions of the codec are now commercially available. The successful post-production activity performed in Tokyo with a HDV clip transmitted from Los Angeles was predicated on the seamless interoperation of all the equipment between the sites, and was an exciting example in deploying a global-scale information infrastructure involving a combination of broadband satellites and terrestrial fiber optic networks. Correlation of atmospheric effects with cell loss, codec drop-out, and picture quality were made. Current efforts in the

  3. Video in Distance Education: ITFS vs. Web-Streaming--Evaluation of Student Attitudes

    Science.gov (United States)

    Reisslein, Jana; Seeling, Patrick; Reisslein, Martin

    2005-01-01

    The use of video in distance education courses has a long tradition, with many colleges and universities having been delivering distance education courses with video since the 80's using the Instructional Television Fixed Service (ITFS) and cable television. With the emergence of the Internet and the increased access bandwidths from private homes…

  4. Optimal JPWL Forward Error Correction Rate Allocation for Robust JPEG 2000 Images and Video Streaming over Mobile Ad Hoc Networks

    Directory of Open Access Journals (Sweden)

    Benoit Macq

    2008-07-01

    Full Text Available Based on the analysis of real mobile ad hoc network (MANET traces, we derive in this paper an optimal wireless JPEG 2000 compliant forward error correction (FEC rate allocation scheme for a robust streaming of images and videos over MANET. The packet-based proposed scheme has a low complexity and is compliant to JPWL, the 11th part of the JPEG 2000 standard. The effectiveness of the proposed method is evaluated using a wireless Motion JPEG 2000 client/server application; and the ability of the optimal scheme to guarantee quality of service (QoS to wireless clients is demonstrated.

  5. Publicación de materiales audiovisuales a través de un servidor de video-streaming Publication of audio-visual materials through a streaming video server

    Directory of Open Access Journals (Sweden)

    Acevedo Clavijo Edwin Jovanny

    2010-07-01

    Full Text Available Esta propuesta tiene como objetivo estudiar varias alternativas de servidores Streaming para determinar la mejor herramienta para el desarrollo de la publicación de material audiovisual educativo. Se evaluaron las plataformas más utilizadas teniendo en cuenta sus características y beneficios que tiene cada servidor entre las los cuales están: Hélix Universal Server, Windows Media Server de Microsoft, Peer Cast y Darwin Server. implementando un servidor con mayores capacidades y beneficios para la publicación de videos con fines académicos a través de la intranet de la Universidad Cooperativa de Colombia seccional Barrancabermeja This proposal has as an principal objective to study different alternatives for streaming servers to determine the best tool in the project’s development. Platforms most used were evaluated features and benefits in each served such as: Helix Universal Server, Microsoft Windows Media Server, Peer Cast and Darwin Server. Implementing a server with more capabilities and benefits for the publication of videos for academic purposes through the intranet of the Cooperative University of Colombia Barrancabermeja’s sectional

  6. Digital Video taken during the 3-person submersible Clelia dive 613 of the NOAA Office of Ocean Exploration's Islands in the Stream 2001 cruise, September 01, 2001 (NCEI Accession 0037126)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The video data in this accession was captured during the Islands in the Stream mission of 2001. Islands in the Stream was a three-month scientific expedition to...

  7. Digital video taken during the 3-person submersible Clelia dive 606 of the NOAA Office of Ocean Exploration's Islands in the Stream 2001 cruise, August 29, 2001 (NCEI Accession 0039739)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The video data in this accession was captured during the Islands in the Stream mission of 2001. Islands in the Stream was a three-month scientific expedition to...

  8. Digital Video taken during the 3-person submersible Clelia dive 609 of the NOAA Office of Ocean Exploration's Islands in the Stream 2001 cruise, August 30, 2001 (NCEI Accession 0037122)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The video data in this accession was captured during the Islands in the Stream mission of 2001. Islands in the Stream was a three-month scientific expedition to...

  9. Subjective Quality Assessment of H.264/AVC Video Streaming with Packet Losses

    Directory of Open Access Journals (Sweden)

    Naccari Matteo

    2011-01-01

    Full Text Available Research in the field of video quality assessment relies on the availability of subjective scores, collected by means of experiments in which groups of people are asked to rate the quality of video sequences. The availability of subjective scores is fundamental to enable validation and comparative benchmarking of the objective algorithms that try to predict human perception of video quality by automatically analyzing the video sequences, in a way to support reproducible and reliable research results. In this paper, a publicly available database of subjective quality scores and corrupted video sequences is described. The scores refer to 156 sequences at CIF and 4CIF spatial resolutions, encoded with H.264/AVC and corrupted by simulating the transmission over an error-prone network. The subjective evaluation has been performed by 40 subjects at the premises of two academic institutions, in standard-compliant controlled environments. In order to support reproducible research in the field of full-reference, reduced-reference, and no-reference video quality assessment algorithms, both the uncompressed files and the H.264/AVC bitstreams, as well as the packet loss patterns, have been made available to the research community.

  10. Telehomecare telecommunication framework - from remote patient monitoring to video visits and robot telepresence.

    Science.gov (United States)

    Lepage, Pierre; Letourneau, Dominic; Hamel, Mathieu; Briere, Simon; Corriveau, Helene; Tousignant, Michel; Michaud, Francois

    2016-08-01

    Over the last few years, the number of remote patient monitoring (RPM) products and of videoconferencing systems has exploded. There is also a significant number of research initiatives addressing the use of service robots for assistance in daily living activities. From a technological standpoint, providing telehomecare services is certainly feasible. However, one technological barrier is to have access to a telecommunication platform that can be adapted to address the broad range of specifications and requirements of clinical and telehealth applications. Handling the full spectrum of possibilities requires a telecommunication framework that can transmit vital sign data from patients to clinicians, bidirectional audio-video from a standard computing device, and also multiple video streams and bidirectional transmission of control data. This paper presents a framework that integrates such capabilities. It also illustrates the versatility of the framework by presenting custom-designed devices allowing integration of capabilities ranging from RPM to video visits and robot telepresence.

  11. Interactive Videoconferencing in Educational Settings: A Case in Primary Education

    Science.gov (United States)

    Sáez-López, José-Manuel; Feliz-Murias, Tiberio; Holgueras-González, Ana-Isabel

    2018-01-01

    This research analyzes the use of Interactive Videoconferencing in classroom, analyzing practice and attitudes of 37 teachers and professors from several countries in the first dimension. The second dimension analyzes innovative approaches and Collaborative Learning through Interactive Videoconferencing using "Skype" in a particular…

  12. Streaming weekly soap opera video episodes to smartphones in a randomized controlled trial to reduce HIV risk in young urban African American/black women.

    Science.gov (United States)

    Jones, Rachel; Lacroix, Lorraine J

    2012-07-01

    Love, Sex, and Choices is a 12-episode soap opera video series created as an intervention to reduce HIV sex risk. The effect on women's HIV risk behavior was evaluated in a randomized controlled trial in 238 high risk, predominately African American young adult women in the urban Northeast. To facilitate on-demand access and privacy, the episodes were streamed to study-provided smartphones. Here, we discuss the development of a mobile platform to deliver the 12-weekly video episodes or weekly HIV risk reduction written messages to smartphones, including; the technical requirements, development, and evaluation. Popularity of the smartphone and use of the Internet for multimedia offer a new channel to address health disparities in traditionally underserved populations. This is the first study to report on streaming a serialized video-based intervention to a smartphone. The approach described here may provide useful insights in assessing advantages and disadvantages of smartphones to implement a video-based intervention.

  13. Power-Constrained Fuzzy Logic Control of Video Streaming over a Wireless Interconnect

    Directory of Open Access Journals (Sweden)

    Mohammed Ghanbari

    2008-06-01

    Full Text Available Wireless communication of video, with Bluetooth as an example, represents a compromise between channel conditions, display and decode deadlines, and energy constraints. This paper proposes fuzzy logic control (FLC of automatic repeat request (ARQ as a way of reconciling these factors, with a 40% saving in power in the worst channel conditions from economizing on transmissions when channel errors occur. Whatever the channel conditions are, FLC is shown to outperform the default Bluetooth scheme and an alternative Bluetooth-adaptive ARQ scheme in terms of reduced packet loss and delay, as well as improved video quality.

  14. Meteoroid orbits from video meteors. The case of the Geminid stream

    Czech Academy of Sciences Publication Activity Database

    Hajduková jr., M.; Koten, Pavel; Kornoš, L.; Toth, J.

    2017-01-01

    Roč. 143, SI (2017), s. 89-98 ISSN 0032-0633. [Meteoroids 2016. Nordwijk, 06.06.2016-10.06.2016] R&D Projects: GA ČR GA14-25251S Institutional support: RVO:67985815 Keywords : meteors * meteoroid orbits * meteoroid streams Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 1.892, year: 2016

  15. Demystifying porn 2.0:a look into a major adult video streaming website

    OpenAIRE

    Tyson, Gareth; Elkhatib, Yehia; Sastry, Nishanth; Uhlig, Steve

    2013-01-01

    The Internet has recently evolved into a huge video delivery infrastructure, with websites such as YouTube and Netflix appearing at the top of most traffic measurement studies. However, most traffic studies have largely kept silent about an area of the Internet that (even today) is poorly understood: adult media distribution. Whereas ten years ago, such services were provided primarily via peer-to-peer file sharing and bespoke websites, recently these have converged towards what is known as "...

  16. Synchronised Encoding of GPS NMEA Messages onto Hig h Definition Video Streams

    OpenAIRE

    Lewis, Paul; Winstanley, Adam C.; McCarthy, Tim

    2007-01-01

    Consumer awareness and retail penetration of high definition (HD) technologies has increased dramatically over the last few years. This has led not only to increased interest and expectation of these technologies but also affordability of equipment. Global Positioning Systems (GPS) have also seen a very dramatic increase in consumer exposure and affordability with in car navigation systems, as an example, becoming more common place. The integration of HD Video (HDV) and GPS offers new researc...

  17. 360° video cloud streaming & HTMLVideoElement extensions: Presentation held at W3C Workshop on Web & Virtual Reality, October 19-20, 2016, San Jose, Calif., USA

    OpenAIRE

    Bassbouss, Louay

    2016-01-01

    Presented in the "360° video on the Web" Session: 360° video on the Web session identified needs for evolutions in streaming infrastructure (both on server and client side) to adapt to the heavy needs of 360° content streaming, and build understanding on what changes are needed to HTML media interfaces to make them suitable for 360° media content. In this presentation, a proof-of-concept 360° video cloud streaming solution that enables high quality 360° video experience on low capability devi...

  18. Cursos por videoconferencia Continuous Medical Education: videoconferencing courses

    Directory of Open Access Journals (Sweden)

    Jorge Picorel

    2010-04-01

    specialist exam. Until the year 2009, students traditionally attended classes in Bahía Blanca. Thereafter, the video teleconferencing method was implemented. The programs were those commonly used for videoconferencing and included the Skype or Oovoo, and systems to electronically send data, such as Rapidshare. This system only consists of two electronic notebooks, a multimedia projection system, an additional monitor and remote connection through the Internet. The lecturer usually sends his/her presentation in Power Point or Flash. This is further downloaded in the notebook that will be used for multimedia projection. The other notebook, fitted with a camera, is placed in such a way that the lecturer will be able to watch the projection. The lecture may be also transmitted using the "shared screen" option. However, if the wide band is not adequate, projection will be slow. During his/her presentation, the lecturer is seen on the screen of a larger monitor, and is asked questions at the end of the lecture. Multiple videoconferencing was carried out between Bahía Blanca, Tucumán and Spain, with overall interaction. By next year, videoconferencing is expected to include those residencies around the country interested in shared learning without geographic boundaries. The Argentine Society of Radiology Courses are also part of this project. The preliminary experience was fruitful, since local and foreign highly qualified educators could be listened to, thus saving time and money.

  19. Learner Outcomes and Satisfaction: A Comparison of Live Video-Streamed Instruction, Satellite Broadcast Instruction, and Face-to-Face Instruction

    Science.gov (United States)

    Abdous, M'hammed; Yoshimura, Miki

    2010-01-01

    This study examined the final grade and satisfaction level differences among students taking specific courses using three different methods: face-to-face in class, via satellite broadcasting at remote sites, and via live video-streaming at home or at work. In each case, the same course was taught by the same instructor in all three delivery…

  20. Evaluating the Use of Streaming Video To Support Student Learning in a First-Year Life Sciences Course for Student Nurses.

    Science.gov (United States)

    Green, Sue M.; Voegeli, David; Harrison, Maureen; Phillips, Jackie; Knowles, Jess; Weaver, Mike; Shepard, Kerry

    2003-01-01

    Nursing students (n=656) used streaming videos on immune, endocrine, and neurological systems using Blackboard software. Of students who viewed all three, 32% found access easy, 59% enjoyed them, and 25% felt very confident in their learning. Results were consistent across three different types and embedding methods. Technical and access problems…

  1. Cross-Layer Measurement on an IEEE 802.11g Wireless Network Supporting MPEG-2 Video Streaming Applications in the Presence of Interference

    Directory of Open Access Journals (Sweden)

    Alessandro Sona

    2010-01-01

    Full Text Available The performance of wireless local area networks supporting video streaming applications, based on MPEG-2 video codec, in the presence of interference is here dealt with. IEEE 802.11g standard wireless networks, that do not support QoS in according with IEEE 802.11e standard, are, in particular, accounted for and Bluetooth signals, additive white Gaussian noise, and competitive data traffic are considered as sources of interference. The goal is twofold: from one side, experimentally assessing and correlating the values that some performance metrics assume at the same time at different layers of an IEEE 802.11g WLAN delivering video streaming in the presence of in-channel interference; from the other side, deducing helpful and practical hints for designers and technicians, in order to efficiently assess and enhance the performance of an IEEE 802.11g WLAN supporting video streaming in some suitable setup conditions and in the presence of interference. To this purpose, an experimental analysis is planned following a cross-layer measurement approach, and a proper testbed within a semianechoic chamber is used. Valuable results are obtained in terms of signal-to-interference ratio, packet loss ratio, jitter, video quality, and interference data rate; helpful hints for designers and technicians are finally gained.

  2. Live-streaming: Time-lapse video evidence of novel streamer formation mechanism and varying viscosity.

    Science.gov (United States)

    Parvinzadeh Gashti, Mazeyar; Bellavance, Julien; Kroukamp, Otini; Wolfaardt, Gideon; Taghavi, Seyed Mohammad; Greener, Jesse

    2015-07-01

    Time-lapse videos of growing biofilms were analyzed using a background subtraction method, which removed camouflaging effects from the heterogeneous field of view to reveal evidence of streamer formation from optically dense biofilm segments. In addition, quantitative measurements of biofilm velocity and optical density, combined with mathematical modeling, demonstrated that streamer formation occurred from mature, high-viscosity biofilms. We propose a streamer formation mechanism by sudden partial detachment, as opposed to continuous elongation as observed in other microfluidic studies. Additionally, streamer formation occurred in straight microchannels, as opposed to serpentine or pseudo-porous channels, as previously reported.

  3. Video demystified

    CERN Document Server

    Jack, Keith

    2004-01-01

    This international bestseller and essential reference is the "bible" for digital video engineers and programmers worldwide. This is by far the most informative analog and digital video reference available, includes the hottest new trends and cutting-edge developments in the field. Video Demystified, Fourth Edition is a "one stop" reference guide for the various digital video technologies. The fourth edition is completely updated with all new chapters on MPEG-4, H.264, SDTV/HDTV, ATSC/DVB, and Streaming Video (Video over DSL, Ethernet, etc.), as well as discussions of the latest standards throughout. The accompanying CD-ROM is updated to include a unique set of video test files in the newest formats. *This essential reference is the "bible" for digital video engineers and programmers worldwide *Contains all new chapters on MPEG-4, H.264, SDTV/HDTV, ATSC/DVB, and Streaming Video *Completely revised with all the latest and most up-to-date industry standards.

  4. Risk-aware scheduling for multi-user video streaming over wireless multi-hop networks

    Science.gov (United States)

    Shiang, Hsien-Po; van der Schaar, Mihaela

    2008-01-01

    To cope with the time-varying network conditions, various error-protection and channel adaptation strategies have been proposed at different layers of the protocol stack. However, these cross-layer strategies can be efficiently optimized only if they act on accurate information about the network conditions and hence, are able to timely adapt to network changes. We analyze the impact of such information feedback on the video quality performances of the collaborative multimedia users sharing the same multi-hop wireless infrastructure. Based on the information feedback, we can estimate the risk that packets from different priority and deadline classes will not arrive at their destination before their decoding deadline. Subsequently, cross-layer optimization strategies such as packet scheduling, retransmission (due to transmission error) limit are adapted to jointly consider the estimated risk as well as the impact in terms of distortion of not receiving different priority packets. Our results quantify the risk estimation and its benefit in different network conditions and for various video applications with different delay constraints.

  5. An Innovative Streaming Video System With a Point-of-View Head Camera Transmission of Surgeries to Smartphones and Tablets: An Educational Utility.

    Science.gov (United States)

    Chaves, Rafael Oliveira; de Oliveira, Pedro Armando Valente; Rocha, Luciano Chaves; David, Joacy Pedro Franco; Ferreira, Sanmari Costa; Santos, Alex de Assis Santos Dos; Melo, Rômulo Müller Dos Santos; Yasojima, Edson Yuzur; Brito, Marcus Vinicius Henriques

    2017-10-01

    In order to engage medical students and residents from public health centers to utilize the telemedicine features of surgery on their own smartphones and tablets as an educational tool, an innovative streaming system was developed with the purpose of streaming live footage from open surgeries to smartphones and tablets, allowing the visualization of the surgical field from the surgeon's perspective. The current study aims to describe the results of an evaluation on level 1 of Kirkpatrick's Model for Evaluation of the streaming system usage during gynecological surgeries, based on the perception of medical students and gynecology residents. Consisted of a live video streaming (from the surgeon's point of view) of gynecological surgeries for smartphones and tablets, one for each volunteer. The volunteers were able to connect to the local wireless network, created by the streaming system, through an access password and watch the video transmission on a web browser on their smartphones. Then, they answered a Likert-type questionnaire containing 14 items about the educational applicability of the streaming system, as well as comparing it to watching an in loco procedure. This study is formally approved by the local ethics commission (Certificate No. 53175915.7.0000.5171/2016). Twenty-one volunteers participated, totalizing 294 items answered, in which 94.2% were in agreement with the items affirmative, 4.1% were neutral, and only 1.7% answers corresponded to negative impressions. Cronbach's α was .82, which represents a good reliability level. Spearman's coefficients were highly significant in 4 comparisons and moderately significant in the other 20 comparisons. This study presents a local streaming video system of live surgeries to smartphones and tablets and shows its educational utility, low cost, and simple usage, which offers convenience and satisfactory image resolution, thus being potentially applicable in surgical teaching.

  6. Telemedicine and Alzheimer's Disease from Studio-Based Videoconferencing to Mobile Handheld Cell Phones

    Directory of Open Access Journals (Sweden)

    Pk (Poh-Kooi Loh

    2009-01-01

    Full Text Available The use of Telemedicine in the assessment of cognitive impairment and Alzheimer's Disease is evolving with advances in Information and Communication Technology. This article outlines the course of evolution in Western Australia, a large state with a sparse population outside of the capital city. The starting point of the evolution, video-conferencing in Telehealth studios, is reviewed as well as the next stage, use of desktop technology, which enables the physician to consult from the office or clinic. A pilot study currently being undertaken to assess the validity of the latest stage in evolution of Telehealth—the use of handheld mobile cell phone video calling that allows the physician and patient to interact at locations convenient to both parties. The pitfalls and implications of the use of this stage, should it prove to be a valid approach, are discussed.

  7. [Assessment of learning activities using streaming video for laboratory practice education: aiming for development of E-learning system that promotes self-learning].

    Science.gov (United States)

    Takeda, Naohito; Takeuchi, Isao; Haruna, Mitsumasa

    2007-12-01

    In order to develop an e-learning system that promotes self-learning, lectures and basic operations in laboratory practice of chemistry were recorded and edited on DVD media, consisting of 8 streaming videos as learning materials. Twenty-six students wanted to watch the DVD, and answered the following questions after they had watched it: "Do you think the video would serve to encourage you to study independently in the laboratory practice?" Almost all students (95%) approved of its usefulness, and more than 60% of them watched the videos repeatedly in order to acquire deeper knowledge and skill of the experimental operations. More than 60% answered that the demonstration-experiment should be continued in the laboratory practice, in spite of distribution of the DVD media.

  8. Graduate Nursing Students' Experience with Synchronous, Interactive Videoconferencing within Online Courses

    Science.gov (United States)

    Foronda, Cynthia; Lippincott, Christine

    2014-01-01

    The purpose of this study was to explore the experience of nurse education certificate students who used interactive, synchronous videoconferencing via Collaborate within online courses. Videoconferencing has grown to include various solutions. Current research regarding use of videoconferencing in master's level nurse education is limited. A…

  9. Reaching Rural Communities: Videoconferencing in K-12 Dance Education

    Science.gov (United States)

    Parrish, Mila

    2009-01-01

    This article reports the findings of a study exploring the effects of using videoconferencing (VC) to deliver dance instruction to rural communities. The context of the study is a university community partnership run through blended live and VC instruction with elementary and middle school students in Eloy, Arizona. This research is part of a…

  10. The Multimodality of Lexical Explanation Sequences during Videoconferenced Pedagogical Interaction

    Science.gov (United States)

    Holt, Benjamin

    2016-01-01

    This study aims to identify and analyze the ways in which semiotic resources are orchestrated by teacher-trainees during videoconferenced French foreign language teaching. Our corpus is made up of six weeks of interaction between seven teacher trainees enrolled in a master's program at Université Lumière Lyon 2 in France and 12 undergraduate…

  11. Telecollaborative Desktop-Videoconferencing Exchange: The Case of Mark

    Science.gov (United States)

    Martin, Véronique

    2014-01-01

    This presentation is a case study of the Intercultural Communicative Competence (ICC) development of Mark, one of ten American students engaged in a desktop-videoconferencing telecollaborative exchange with a class of French students. Due in part to its inherent complexity, this context has not been widely researched. To observe ICC development, I…

  12. Using Videoconferencing to Create Authentic Online Learning for Volunteers

    Science.gov (United States)

    Lobley, Jennifer; Ouellette, Kristy L.

    2017-01-01

    Face-to-face training for Extension volunteers is no longer the only viable delivery mode. In times of rapid technological advances, we are faced with a plethora of options for offering volunteers the training and support they need. Zoom, an online videoconferencing platform, can easily be used to engage volunteers in professional development.…

  13. Cross-Border Student Collaborations: Opportunities for Videoconferencing

    Science.gov (United States)

    Scovotti, Carol; Spiller, Lisa D.

    2011-01-01

    Globalization has prompted businesses to adopt burgeoning technologies that support the efforts of distributed teams. This project unites students from geographically dispersed master's-level programs on two continents. Using videoconferencing, virtual workspace, telephone, and e-mail, MBA students at a U.S. university teamed with students from…

  14. Technical Evaluation Report 13: Online Video Conferencing Products

    Directory of Open Access Journals (Sweden)

    Pam Craven

    2002-10-01

    Full Text Available This is the first in Athabasca University’s series of evaluation reports to feature online Webcam and videoconferencing products. While Webcam software generates a simple visual presentation from a live online camera, videoconferencing products contain a wider range of interactive features serving multi-point interactions between participants. In many online situations, the addition of video images to a live presentation can add substantially to its educational effectiveness. Ten products/ online services are reviewed, supporting a wide range of video-based activities.

  15. Videoconferencing could reduce the number of mental health patients transferred from outlying facilities to a regional mental health unit.

    Science.gov (United States)

    Buckley, David; Weisser, Susan

    2012-10-01

    To determine if the addition of a video link to the existing phone connection, enabling patients admitted for mental and behavioural disorders to be seen by a centrally located psychiatrist or mental health clinician, would change the probability of these patients being transferred to the central mental health unit. Data analysed were patients admitted (n=1,943) to a health services regional hospital with a primary diagnosis of mental and behavioural disorders (ICD10-AM code F00-F99) between January 2002 and December 2010. The probability of being transferred was modelled using multilevel random intercept logistic regression. The introduction of videoconferencing in January 2008 was examined by testing if the inclusion of a binary intervention variable was significant when added to the best fitting risk adjustment model. After the introduction of videoconferencing the percentage of patients transferred fell from 66.8% (95%CI 64.0 to 69.5) to 59.6% (95%CI 56.1 to 63.1) (χ(2) =10.42, p=0.001). After adjusting for age, sex, clustering in hospitals and repeat visits the odds of transfer were 0.69 (95%CI 0.49 to 0.97) of previous. Aboriginality, being non-Australian, long-term linear trend, admitted on the weekends or after hours were not significant predictors of the probability of transfer. The ability for the psychiatrist or senior mental health clinician to see mental health patients via videoconferencing was associated with a reduced probability of the patient being transferred. This satisfies the preference of patients to remain in their community and access mental health services. © 2012 The Authors. ANZJPH © 2012 Public Health Association of Australia.

  16. Development of a cell phone-based video streaming system for persons with early stage Alzheimer's disease.

    Science.gov (United States)

    Donnelly, Mark P; Nugent, Chris D; Craig, David; Passmore, Peter; Mulvenna, Maurice

    2008-01-01

    The current paper presents details regarding the early developments of a memory prompt solution for persons with early dementia. Using everyday technology, in the form of a cell-phone, video reminders are delivered to assist with daily activities. The proposed CPVS system will permit carers to record and schedule video reminders remotely using a standard personal computer and web cam. It is the aim of the three year project that through the frequent delivery of helpful video reminders that a 'virtual carer' will be present with the person with dementia at all times. The first prototype of the system has been fully implemented with the first field trial scheduled to take place in May 2008. Initially, only three patient carer dyads will be involved, however, the second field trial aims to involve 30 dyads in the study. Details of the first prototype and the methods of evaluation are presented herein.

  17. Immersive video

    Science.gov (United States)

    Moezzi, Saied; Katkere, Arun L.; Jain, Ramesh C.

    1996-03-01

    Interactive video and television viewers should have the power to control their viewing position. To make this a reality, we introduce the concept of Immersive Video, which employs computer vision and computer graphics technologies to provide remote users a sense of complete immersion when viewing an event. Immersive Video uses multiple videos of an event, captured from different perspectives, to generate a full 3D digital video of that event. That is accomplished by assimilating important information from each video stream into a comprehensive, dynamic, 3D model of the environment. Using this 3D digital video, interactive viewers can then move around the remote environment and observe the events taking place from any desired perspective. Our Immersive Video System currently provides interactive viewing and `walkthrus' of staged karate demonstrations, basketball games, dance performances, and typical campus scenes. In its full realization, Immersive Video will be a paradigm shift in visual communication which will revolutionize television and video media, and become an integral part of future telepresence and virtual reality systems.

  18. Video Medical Interpretation over 3G Cellular Networks: A Feasibility Study

    Science.gov (United States)

    Williamson, Deborah; Sterrett, James; Detzler, Isabel; Ackerman, Michael

    2011-01-01

    Abstract Objective: To test the feasibility of using cell phone technology to provide video medical interpretation services at a distance. Materials and Methods: Alternative cell phone services were researched and videoconferencing technologies were tried out to identify video products and telecommunication services needed to meet video medical interpretation requirements. The video and telecommunication technologies were tried out in a pharmacy setting and compared with use of the telephone. Results: Outcomes were similar to findings in previous research involving video medical interpretation with higher bandwidth and video quality. Patients appreciated the interpretation service no matter how it is provided, while health providers and interpreters preferred video. Conclusion: It is possible to provide video medical interpretation services via cellular communication using lower bandwidth videoconferencing technology that provides sufficient quality, at least in pharmacy settings. However, a number of issues need to be addressed to ensure quality of service. PMID:22011055

  19. Videoconferencing for Practice-Based Small-Group Continuing Medical Education: Feasibility, Acceptability, Effectiveness, and Cost.

    Science.gov (United States)

    Allen, Michael; Sargeant, Joan; Mann, Karen; Fleming, Michael; Premi, John

    2003-01-01

    Physicians in three communities (n=31) participated in four problem-based learning modules via videoconferencing. Posttest scores were 20% higher and learners reported an average of nine practice changes. Facilitators and observers reported a number of technical difficulties. Facilitators found videoconferencing slightly more difficult than…

  20. Participatory Continuing Design: "Living with" Videoconferencing in Rehabilitation.

    Science.gov (United States)

    Aanestad, Margunn; Driveklepp, Anne Merete; Sørli, Hilde; Hertzum, Morten

    2017-01-01

    While much research emphasizes design-before-use, we here study design-in-use. The notion of participatory continuing design is introduced to draw attention to the ongoing work of incorporating information and communication technology into work processes in healthcare institutions. Through an empirical case study of how telemedicine, in the form of videoconferencing, was taken up in a rehabilitation hospital in Norway, the nature of such ongoing experimentation, learning, and redesign is described. When contrasted with traditional design-before-use practices, participatory continuing design differs in terms of its timing, object, process, outcome, and participants. We offer recommendations for how such processes can be supported in healthcare organizations.

  1. Las posibilidades didácticas y manejo de Video Streaming en las clases de lengua y literatura.

    Directory of Open Access Journals (Sweden)

    José Soto Vázquez

    2009-01-01

    Full Text Available Resumen: La incorporación de las nuevas tecnologías en las aulas ha supuesto una nueva concepción del modelo educativo en el que el docente juega un papel determinante. No obstante, la diversidad de herramientas didácticas es tan amplia que necesita de trabajos parciales que enfoquen la utilidad de cada una de ellas. En este sentido, la enseñanza de las lenguas tiene en V Streaming una pieza fundamental que permite estudiar la lengua oral actual, a la vez que alienta el uso de las nuevas tecnologías.Summary: The incorporation of new technologies into the classroom has meant a new conception of the educational model where the teacher plays an important role. Nevertheless, the diversity of didactic tools is so wide that partial works are required to focus the utility of each of them. In this respect, the teaching of languages have in V Streaming a fundamental piece that allows studying current oral language, as well as encouraging the use of new technologies.

  2. An improved mixture-of-Gaussians background model with frame difference and blob tracking in video stream.

    Science.gov (United States)

    Yao, Li; Ling, Miaogen

    2014-01-01

    Modeling background and segmenting moving objects are significant techniques for computer vision applications. Mixture-of-Gaussians (MoG) background model is commonly used in foreground extraction in video steam. However considering the case that the objects enter the scenery and stay for a while, the foreground extraction would fail as the objects stay still and gradually merge into the background. In this paper, we adopt a blob tracking method to cope with this situation. To construct the MoG model more quickly, we add frame difference method to the foreground extracted from MoG for very crowded situations. What is more, a new shadow removal method based on RGB color space is proposed.

  3. An Improved Mixture-of-Gaussians Background Model with Frame Difference and Blob Tracking in Video Stream

    Directory of Open Access Journals (Sweden)

    Li Yao

    2014-01-01

    Full Text Available Modeling background and segmenting moving objects are significant techniques for computer vision applications. Mixture-of-Gaussians (MoG background model is commonly used in foreground extraction in video steam. However considering the case that the objects enter the scenery and stay for a while, the foreground extraction would fail as the objects stay still and gradually merge into the background. In this paper, we adopt a blob tracking method to cope with this situation. To construct the MoG model more quickly, we add frame difference method to the foreground extracted from MoG for very crowded situations. What is more, a new shadow removal method based on RGB color space is proposed.

  4. The use of videoconferencing with patients with psychosis: a review of the literature

    Directory of Open Access Journals (Sweden)

    Kobak Kenneth A

    2011-04-01

    Full Text Available Abstract Videoconferencing has become an increasingly viable tool in psychiatry, with a growing body of literature on its use with a range of patient populations. A number of factors make it particularly well suited for patients with psychosis. For example, patients living in remote or underserved areas can be seen by a specialist without need for travel. However, the hallmark symptoms of psychotic disorders might lead one to question the feasibility of videoconferencing with these patients. For example, does videoconferencing exacerbate delusions, such as paranoia or delusions of reference? Are acutely psychotic patients willing to be interviewed remotely by videoconferencing? To address these and other issues, we conducted an extensive review of Medline, PsychINFO, and the Telemedicine Information Exchange databases for literature on videoconferencing and psychosis. Findings generally indicated that assessment and treatment via videoconferencing is equivalent to in person and is tolerated and well accepted. There is little evidence that patients with psychosis have difficulty with videoconferencing or experience any exacerbation of symptoms; in fact, there is some evidence to suggest that the distance afforded can be a positive factor. The results of two large clinical trials support the reliability and effectiveness of centralized remote assessment of patients with schizophrenia.

  5. The contribution of teleconsultation and videoconferencing to diabetes care : A systematic literature review

    NARCIS (Netherlands)

    Verhoeven, Fenne; Van Gemert-Pijnen, Lisette; Dijkstra, Karin; Nijland, Nicol; Seydel, Erwin; Steehouder, Michaël

    2007-01-01

    Background: A systematic literature review was carried out to study the benefits of teleconsultation and videoconferencing on the multifaceted process of diabetes care. Previous reviews focused primarily on usability of technology and considered mainly one-sided interventions. Objective: The

  6. The contribution of teleconsultation and videoconferencing to diabetes care: a systematic literature review

    NARCIS (Netherlands)

    Verhoeven, F.; van Gemert-Pijnen, Julia E.W.C.; Dijkstra, K.; Nijland, N.; Seydel, E.R.; Steehouder, M.F.

    2007-01-01

    Background: A systematic literature review was carried out to study the benefits of teleconsultation and videoconferencing on the multifaceted process of diabetes care. Previous reviews focused primarily on usability of technology and considered mainly one-sided interventions. Objective: The

  7. Evaluation of a virtual pet visit system with live video streaming of patient images over the Internet in a companion animal intensive care unit in the Netherlands.

    Science.gov (United States)

    Robben, Joris H; Melsen, Diede N; Almalik, Osama; Roomer, Wendy; Endenburg, Nienke

    2016-05-01

    To evaluate the impact of a virtual pet visit system ("TelePet" System, TPS) on owners and staff of a companion animal ICU. Longitudinal interventional study (2010-2013). Companion animal ICU at a university veterinary medical teaching hospital. Pet owners, ICU technicians. The introduction of the TPS, with live video streaming of patient images over the Internet, in a companion animal ICU. Pet owners experienced TPS as a valuable extra service. Most TPS users (72.4%) experienced less anxiety and felt less need (40.4% of TPS users) to visit their hospitalized pet in person. Most users (83.5%) shared TPS access with their family. The introduction of the TPS did not improve overall owner satisfaction, except for the score on "quality of medical treatment." Seven of 26 indicators of owner satisfaction were awarded higher scores by TPS users than by TPS nonusers in the survey after the introduction of the system. However, the lack of randomization of owners might have influenced findings. The enthusiasm of the ICU technicians for the system was tempered by the negative feedback from a small number of owners. Nevertheless they recognized the value of the system for owners. The system was user friendly and ICU staff and TPS users experienced few technical problems. As veterinary healthcare is moving toward a more client-centered approach, a virtual pet visit system, such as TPS, is a relatively simple application that may improve the well-being of most owners during the hospitalization of their pet. © Veterinary Emergency and Critical Care Society 2016.

  8. Effectiveness of Artistic Interaction through Video Conferencing

    Directory of Open Access Journals (Sweden)

    Suzan Duygu Erişti

    2011-10-01

    Full Text Available This study investigated Turkish and Canadian primary school students’ ways of expressing their perception of interactive art education through video conferencing and that of cultural interaction through pictorial representations. The qualitative research data were collected in the form of pictures and interviews on interactive art education along with cultural components depicted in pictures. The results obtained were analyzed and interpreted based on the quantitative content analysis method. The research results revealed that the majority of the students explained their viewpoints through the effectiveness of the process. The students highlighted the importance of learning a different culture, learning about a different art technique and recognizing new friends in the process. The synchronization regarding interactive art education through videoconferencing was another important experience reflected by the students. Most of the students indicated that interactive art education through videoconferencing encouraged them to learn and understand about different cultures, helped them develop cultural awareness, attracted their attention and increased their motivation.

  9. Effectiveness of Artistic Interaction through Video Conferencing

    Directory of Open Access Journals (Sweden)

    Suzan Duygu Erişti

    2011-04-01

    Full Text Available This study investigated Turkish and Canadian primary school students’ ways of expressing their perception of interactive art education through video conferencing and that of cultural interaction through pictorial representations. The qualitative research data were collected in the form of pictures and interviews on interactive art education along with cultural components depicted in pictures. The results obtained were analyzed and interpreted based on the quantitative content analysis method. The research results revealed that the majority of the students explained their viewpoints through the effectiveness of the process. The students highlighted the importance of learning a different culture, learning about a different art technique and recognizing new friends in the process. The synchronization regarding interactive art education through videoconferencing was another important experience reflected by the students. Most of the students indicated that interactive art education through videoconferencing encouraged them to learn and understand about different cultures, helped them develop cultural awareness, attracted their attention and increased their motivation

  10. Intelligent video surveillance systems

    CERN Document Server

    Dufour, Jean-Yves

    2012-01-01

    Belonging to the wider academic field of computer vision, video analytics has aroused a phenomenal surge of interest since the current millennium. Video analytics is intended to solve the problem of the incapability of exploiting video streams in real time for the purpose of detection or anticipation. It involves analyzing the videos using algorithms that detect and track objects of interest over time and that indicate the presence of events or suspect behavior involving these objects.The aims of this book are to highlight the operational attempts of video analytics, to identify possi

  11. Videoconferencing for the pre-operative interaction between patient and surgeon.

    Science.gov (United States)

    Del Signore, Anthony G; Dang, Rajan; Yerasi, Arjun; Iloreta, Alfred M; Malkin, Benjamin D

    2014-07-01

    We studied the use of videoconferencing for the pre-operative patient-surgeon interaction. Subjects were recruited from otolaryngology patients undergoing surgery at a tertiary hospital. They were randomised to a conventional face-to-face interaction with their surgeon or a videoconference call via tablet computer. Afterwards, subjects and surgeons completed questionnaires about the experience. Various time points in patient flow were also recorded. Thirty-one patients were enrolled and 25 completed the study; five surgeons participated. The mean overall patient satisfaction scores were similar in the face-to-face and videoconferencing groups (9.88 and 9.89, respectively), as were mean interaction times (119 and 82 s, respectively); neither difference was significant. The mean waiting times in the pre-operative holding area were not significantly different between the groups. Surgeons were satisfied with the videoconferencing and 60% indicated they were somewhat likely to incorporate the technology into their daily practice. Overall patient satisfaction with a pre-operative patient-surgeon interaction via videoconferencing did not differ significantly from that for a conventional face-to-face discussion. It is feasible to incorporate videoconferencing into a busy surgical practice and there is the potential for improved efficiency. © The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

  12. MPEG-4 video compression optimization research

    Science.gov (United States)

    Wei, Xianmin

    2011-10-01

    In order to make a large amount of video data compression and effectively with limited network bandwidth to transfer smoothly, this article using the MPEG-4 compression technology to compress video stream. In the network transmission, according to the characteristics of video stream, for transmission technology to carry out full analysis and optimization, and combining current network bandwidth status and protocol, to establish one network model with transferring and playback video streaming effectively. Through a combination of these two areas, significantly improved compression and storage of video files and network transmission efficiency, increased video processing power.

  13. An overview of new video techniques

    CERN Document Server

    Parker, R

    1999-01-01

    Current video transmission and distribution systems at CERN use a variety of analogue techniques which are several decades old. It will soon be necessary to replace this obsolete equipment, and the opportunity therefore exists to rationalize the diverse systems now in place. New standards for digital transmission and distribution are now emerging. This paper gives an overview of these new standards and of the underlying technology common to many of them. The paper reviews Digital Video Broadcasting (DVB), the Motion Picture Experts Group specifications (MPEG1, MPEG2, MPEG4, and MPEG7), videoconferencing standards (H.261 etc.), and packet video systems, together with predictions of the penetration of these standards into the consumer market. The digital transport mechanisms now available (IP, SDH, ATM) are also reviewed, and the implication of widespread adoption of these systems on video transmission and distribution is analysed.

  14. Interactive video algorithms and technologies

    CERN Document Server

    Hammoud, Riad

    2006-01-01

    This book covers both algorithms and technologies of interactive videos, so that businesses in IT and data managements, scientists and software engineers in video processing and computer vision, coaches and instructors that use video technology in teaching, and finally end-users will greatly benefit from it. This book contains excellent scientific contributions made by a number of pioneering scientists and experts from around the globe. It consists of five parts. The first part introduces the reader to interactive video and video summarization and presents effective methodologies for automatic abstraction of a single video sequence, a set of video sequences, and a combined audio-video sequence. In the second part, a list of advanced algorithms and methodologies for automatic and semi-automatic analysis and editing of audio-video documents are presented. The third part tackles a more challenging level of automatic video re-structuring, filtering of video stream by extracting of highlights, events, and meaningf...

  15. The use of videoconferencing to enhance interprofessional clinical education for allied health students.

    Science.gov (United States)

    Britt, Kerry Lee; Hewish, Sara; Rodda, Jill; Eldridge, Bev

    2012-07-01

    The Health-e-Learning project investigated the use of videoconferencing to deliver interprofessional clinical education to allied health students. Via a broadband link, students observed DVD footage of a clinical session then participated in discussion with the clinicians at the Royal Children's Hospital (RCH), Melbourne. The videoconference sessions were evaluated with respect to session content, the effectiveness of videoconferencing in providing interprofessional education (IPE) and the satisfaction with this as a supplement to facility-based placements. During the two semesters of the project, 28 videoconference sessions were conducted and 724 participants were surveyed. Student responses were positive with 84% indicating that these videoconferences increased their understanding of interprofessional practice (IPP) and 95% agreeing that the sessions were an effective learning tool. The results of this study support the use of videoconferencing to provide interprofessional clinical education.

  16. A Pedestrian Navigation System Using Cellular Phone Video-Conferencing Functions

    Directory of Open Access Journals (Sweden)

    Akihiko Sugiura

    2012-01-01

    Full Text Available A user’s position-specific field has been developed using the Global Positioning System (GPS technology. To determine the position using cellular phones, a device was developed, in which a pedestrian navigation unit carries the GPS. However, GPS cannot specify a position in a subterranean environment or indoors, which is beyond the reach of transmitted signals. In addition, the position-specification precision of GPS, that is, its resolution, is on the order of several meters, which is deemed insufficient for pedestrians. In this study, we proposed and evaluated a technique for locating a user’s 3D position by setting up a marker in the navigation space detected in the image of a cellular phone. By experiment, we verified the effectiveness and accuracy of the proposed method. Additionally, we improved the positional precision because we measured the position distance using numerous markers.

  17. Exploring Cultural Horizons: Connecting Australian Students with Asian Students via Video-Conferencing

    Science.gov (United States)

    Reading, Chris; Auh, Myung-Sook; Pegg, John; Cybula, Peter

    2013-01-01

    The need for Australian school students to develop a strong understanding of Asian culture has been recognised in the cross-curriculum priority, "Asia and Australia's Engagement with Asia," of the Australian Curriculum. School students in rural and remote Australia have limited opportunities to engage with Asians and learn about their…

  18. Using MPEG DASH SRD for zoomable and navigable video

    NARCIS (Netherlands)

    D'Acunto, L.; Berg, J. van den; Thomas, E.; Niamut, O.A.

    2016-01-01

    This paper presents a video streaming client implementation that makes use of the Spatial Relationship Description (SRD) feature of the MPEG-DASH standard, to provide a zoomable and navigable video to an end user. SRD allows a video streaming client to request spatial subparts of a particular video

  19. Developing a Video Steganography Toolkit

    OpenAIRE

    Ridgway, James; Stannett, Mike

    2014-01-01

    Although techniques for separate image and audio steganography are widely known, relatively little has been described concerning the hiding of information within video streams ("video steganography"). In this paper we review the current state of the art in this field, and describe the key issues we have encountered in developing a practical video steganography system. A supporting video is also available online at http://www.youtube.com/watch?v=YhnlHmZolRM

  20. Video Chat vs. Face-to-Face Recasts, Learners' Interpretations and L2 Development: A Case of Persian EFL Learners

    Science.gov (United States)

    Rassaei, Ehsan

    2017-01-01

    This study investigated the effects of two modes of corrective feedback, namely, face-to-face recasts and computer-mediated recasts during video-conferencing on Iranian English as a foreign language (EFL) learners' second language (L2) development. Moreover, the accuracy of the learners' interpretations of recasts in the two modalities was…

  1. Skype Videoconferencing for Less Commonly Taught Languages: Examining the Effects on Students' Foreign Language Anxiety

    Science.gov (United States)

    Terantino, Joe

    2014-01-01

    This study compared students' foreign language anxiety levels while completing oral assessments administered face-to-face (F2F) and via Skype videoconferencing for university courses delivered under the self-instructional language program (SILP) model (Dunkel, Brill, & Kohl, 2002). Data were gathered by administering a modified Foreign…

  2. Videoconferencing of a national program for residents on evidence-based practice: early performance evaluation.

    LENUS (Irish Health Repository)

    O'Regan, Kevin

    2010-01-01

    The aim of this study was to evaluate the effectiveness of the medium of videoconferencing for the delivery of a course for radiology residents in practice-based learning (PBL), including evidence-based practice, at centers geographically separated from the principal teaching site.

  3. Effects of Task-Based Videoconferencing on Speaking Performance and Overall Proficiency

    Science.gov (United States)

    Iino, Atsushi; Yabuta, Yukiko; Nakamura, Yoichi

    2016-01-01

    The purpose of this study is to find the effects of using Videoconferencing (VC) as a tool for foreign language instructions in a semester long research study. The research questions focus on the effects of VC (1) on speaking skills, and (2) on general proficiency scores. English as a Foreign Language (EFL) learners in a university in Japan were…

  4. Bringing the World to the Classroom through Videoconferencing and Project-Based Learning

    Science.gov (United States)

    Hopper, Susan B.

    2014-01-01

    The focus of this paper is a case study of a Texas-based school that implemented global projects to connect their students with many states and countries as a platform for integrating collaboration and communication skills, technology tools, and cultural diversity into an existing curriculum. The school introduced videoconferencing at every grade…

  5. Influences on the educational use of the WWW e-mail and videoconferencing.

    NARCIS (Netherlands)

    Collis, Betty; Peters, O.; Pals, Nico

    2000-01-01

    As email, the World Wide Web (WWW) and videoconferencing become more and more familiar in daily life, does this mean that their use will also be commonplace in the way teaching and learning activities occur in educational and training organizations? Here we report on the results of a survey of 550

  6. The Effects of Videoconferenced Distance-Learning Instruction in a Taiwanese Company

    Science.gov (United States)

    Lin, Chin-Hung; Yang, Shu-Ching

    2011-01-01

    Distance learning, where instruction is given to students despite wide separations of students and teachers, is increasingly popular. Videoconferencing, which is examined in this study, is a distance learning mode of featuring real-time interaction of students and teachers and provides sequence, real-time, vision, and actual interaction. This…

  7. Treatment via videoconferencing: a pilot study of delivery by clinical psychology trainees.

    Science.gov (United States)

    Dunstan, Debra A; Tooth, Susan M

    2012-04-01

    This pilot study explored the outcomes of clinical psychology trainees delivering treatments via videoconferencing. A noncurrent, multiple baseline across subjects and settings. University outpatient psychology clinic. Six clients (two men and four women) with an anxiety or depressive disorder were randomly assigned to received six sessions of individual therapy (either via videoconferencing or face to face) from a male or female clinical psychology trainee. Participants provided daily ratings (0-10) of subjective distress/well-being via text messaging, and at pre-, post-, and 1 month follow-up of treatment, completed the Depression Anxiety Stress Scales and the Outcome Questionnaire-45. Along with the trainees, participants also provided feedback on the therapy experience. The subjective well-being of all participants improved, and all videoconferencing participants showed a statistically and clinically significant reduction in symptomology and gains in general life functioning. Feedback comments were positive. This study suggests that there is value in clinical psychology trainees gaining experience in the delivery of treatments via videoconferencing. Further study is needed to demonstrate the potential for university clinics to deliver mental health services, via this modality, to rural and remote areas. © 2012 The Authors. Australian Journal of Rural Health © 2012 National Rural Health Alliance Inc.

  8. Using Desktop Videoconferencing to Deliver Interventions to a Preschool Student with Autism

    Science.gov (United States)

    Gibson, Jason L.; Pennington, Robert C.; Stenhoff, Donald M.; Hopper, Jessica S.

    2010-01-01

    The purpose of this study is to evaluate the impact of functional communication training on elopement when consultation support is delivered via desktop videoconferencing. An ABAB design was used to evaluate the effectiveness of functional communication training to reduce the elopement of a preschool student with autism. Intervention development,…

  9. Using Internet Videoconferencing to Connect Fashion Students with Apparel Industry Professionals

    Science.gov (United States)

    Ashley, Vera Bruce

    2010-01-01

    The purpose of this study was to explore the efficacy, benefits and student perceptions of using Internet videoconferencing and a web camera to connect college and university fashion students with apparel industry professionals. A total of 70 college and university fashion students, three instructors, and three apparel industry professionals…

  10. ATLAS Live: Collaborative Information Streams

    Science.gov (United States)

    Goldfarb, Steven; ATLAS Collaboration

    2011-12-01

    I report on a pilot project launched in 2010 focusing on facilitating communication and information exchange within the ATLAS Collaboration, through the combination of digital signage software and webcasting. The project, called ATLAS Live, implements video streams of information, ranging from detailed detector and data status to educational and outreach material. The content, including text, images, video and audio, is collected, visualised and scheduled using digital signage software. The system is robust and flexible, utilizing scripts to input data from remote sources, such as the CERN Document Server, Indico, or any available URL, and to integrate these sources into professional-quality streams, including text scrolling, transition effects, inter and intra-screen divisibility. Information is published via the encoding and webcasting of standard video streams, viewable on all common platforms, using a web browser or other common video tool. Authorisation is enforced at the level of the streaming and at the web portals, using the CERN SSO system.

  11. ATLAS Live: Collaborative Information Streams

    CERN Document Server

    Goldfarb, S; The ATLAS collaboration

    2011-01-01

    I report on a pilot project launched in 2010 focusing on facilitating communication and information exchange within the ATLAS Collaboration, through the combination of digital signage software and webcasting. The project, called ATLAS Live, implements video streams of information, ranging from detailed detector and data status to educational and outreach material. The content, including text, images, video and audio, is collected, visualised and scheduled using digital signage software. The system is robust and flexible, utilizing scripts to input data from remote sources, such as the CERN Document Server, Indico, or any available URL, and to integrate these sources into professional-quality streams, including text scrolling, transition effects, inter and intra-screen divisibility. Information is published via the encoding and webcasting of standard video streams, viewable on all common platforms, using a web browser or other common video tool. Authorisation is enforced at the level of the streaming and at th...

  12. ATLAS Live: Collaborative Information Streams

    CERN Document Server

    Goldfarb, S; The ATLAS collaboration

    2010-01-01

    I report on a pilot project launched in 2010 focusing on facilitating communication and information exchange within the ATLAS Collaboration, through the combination of digital signage software and webcasting. The project, called ATLAS Live, implements video streams of information, ranging from detailed detector and data status to educational and outreach material. The content, including text, images, video and audio, is collected, visualised and scheduled using the SCALA digital signage software system. The system is robust and flexible, allowing for the usage of scripts to input data from remote sources, such as the CERN Document Server, Indico, or any available URL, and to integrate these sources into professional-quality streams, including text scrolling, transition effects, inter and intrascreen divisibility. The video is made available to the collaboration or public through the encoding and webcasting of standard video streams, viewable on all common platforms, using a web browser or other common video t...

  13. Telemetry and Communication IP Video Player

    Science.gov (United States)

    OFarrell, Zachary L.

    2011-01-01

    Aegis Video Player is the name of the video over IP system for the Telemetry and Communications group of the Launch Services Program. Aegis' purpose is to display video streamed over a network connection to be viewed during launches. To accomplish this task, a VLC ActiveX plug-in was used in C# to provide the basic capabilities of video streaming. The program was then customized to be used during launches. The VLC plug-in can be configured programmatically to display a single stream, but for this project multiple streams needed to be accessed. To accomplish this, an easy to use, informative menu system was added to the program to enable users to quickly switch between videos. Other features were added to make the player more useful, such as watching multiple videos and watching a video in full screen.

  14. Videoconferencing for Health Care Provision for Older Adults in Care Homes: A Review of the Research Evidence

    Directory of Open Access Journals (Sweden)

    Louise Newbould

    2017-01-01

    Full Text Available A scoping review was conducted to map the research evidence on the use of videoconferencing for remote health care provision for older adults in care homes. The review aimed to identify the nature and extent of the existing evidence base. Databases used were Embase, Medline, Web of Science, and Cochrane Library Reviews. The review identified 26 articles for inclusion, of which 14 were case studies, making the most used study design. Papers described videoconferencing as being used for assessment, management of health care, clinical support, and diagnosis, with eight of the papers reporting the use of videoconferencing for more than one clinical purpose. A further eight papers reported the use of videoconferencing for assessment alone. The literature reported the collection of various types of data, with 12 papers describing the use of both qualitative and quantitative data. The outcomes mainly addressed staff satisfaction (n=9 and resident satisfaction (n=8. Current evidence supports the feasibility of videoconferencing in care homes. However, research needs to be undertaken to establish the contexts and mechanisms that underpin the successful implementation of videoconferencing in care homes and to define useful measures for success.

  15. Improving Peer-to-Peer Video Systems

    NARCIS (Netherlands)

    Petrocco, R.P.

    2016-01-01

    Video Streaming is nowadays the Internet’s biggest source of consumer traffic. Traditional content providers rely on centralised client-server model for distributing their video streaming content. The current generation is moving from being passive viewers, or content consumers, to active content

  16. Comparison of Teaching and Learning Outcomes between Video-Linked, Web-Based, and Classroom Tutorials: An Innovative International Study of Profession Education in Physical Therapy

    Science.gov (United States)

    Jones, Alice Y. M.; Dean, Elizabeth; Hui-Chan, Christina

    2010-01-01

    The influence of interactive videoconferencing (IVC) on health professional educational outcomes between Canada and Hong Kong students was examined. Three formats were compared with respect to the instruction of two circumscribed intensive care topics. The formats included international video-linked (VL) tutorials in combination with web-based…

  17. Using videoconferencing in a school-scientist partnership: students’ perceptions and scientists’ challenges

    Directory of Open Access Journals (Sweden)

    Garry Falloon

    2012-08-01

    Full Text Available This research studied a series of videoconference teaching workshops and virtual labs, which formed a component of a school-scientist partnership involving a New Zealand science research institute and year 13 students at a Wellington high school. It explored students’ perceptions of the effectiveness of the videoconferences as an interactive medium for developing content knowledge, identified factors influencing their level of interaction during the conferences, and exposed issues when using videoconferences for highly specialised activities. The research followed an interpretive methodology using a case study approach, and employed mixed method qualitative/quantitative data gathering procedures. Results suggest that while videoconferencing was effective it was also expensive and time-consuming, and that scientists’ efforts to engage students more interactively through movement towards more constructive practice, were largely ineffective. This article provides direction for teachers considering exploring the potential of interactive videoconferencing with students.

  18. Using International Videoconferencing to Extend the Global Reach of Community Health Nursing Education.

    Science.gov (United States)

    Ziemba, Rosemary; Sarkar, Norma J; Pickus, Becca; Dallwig, Amber; Wan, Jiayi Angela; Alcindor, Hilda

    2016-07-01

    Travel abroad provides college students with a unique learning experience. When plans to take undergraduate community health nursing students from the United States to Haiti were cancelled due to health and safety concerns, faculty piloted international videoconferencing with a nursing program in Haiti as an alternative. During this semester-long course, students in both countries assessed a local community using the Community as Partner framework and compared findings during videoconferences with their international peers. Despite communication challenges such as language barriers and limited internet access in Haiti, evaluative data suggests that all students valued learning with their nursing student peers in another country. For future international videoconferencing endeavors, especially with under-resourced communities, we provide recommendations in the following categories: 1) Building relationships with a partner school, 2) Technology, 3) Pedagogy, and 4) Facilitating interactions between students. © 2016 Wiley Periodicals, Inc.

  19. Effective web videoconferencing for proctoring online oral exams: a case study at scale in Brazil

    OpenAIRE

    Okada, A; Scott, Peter; Mendonca, Murilo

    2015-01-01

    The challenging of assessing formal and informal online learning at scale includes various issues. Many universities who are now promoting “Massive Online Open Courses” (MOOC), for instance, focus on relatively informal assessment of participant competence, which is not highly ‘quality assured’. This paper reports best practices on the use of a web videoconferencing application to quality control student assignments through online oral examination at scale. In this case study, we examine the ...

  20. The evolution and evaluation of videoconferencing technology for graduate nursing education.

    Science.gov (United States)

    Sackett, Kay Marie; Campbell-Heider, Nancy; Blyth, John B

    2004-01-01

    The Integrated Services Digital Network H.323 (ISDN), which has been in use for the past 20 years often requires a dedicated telephone line and other equipment to implement. Consequently, expansion of ISDN-based videoconferencing requires infrastructure not always accessible in those areas that are most in need of technological connections. New H.323 technology using Internet Protocol H.320 (IP) connectivity can accommodate the use in a variety of videoconferencing software and fill this void as demonstrated by an experiment conducted live at the Syllabus Web '99 conference. When a faculty group were unable to secure ISDN connections to demonstrate their clinical evaluation of Family Nurse Practitioner (FNP) students using videoconferencing technology, an ad hoc group of computer experts, educators, instructional design specialists, and corporate sponsors collaborated to design a multipoint PC-based connection using IP connectivity. This article describes the first application of this technology, the evolution of ISDN and IP systems in nursing education and practice, and suggests appropriate future trends for their utility in nursing.

  1. Evaluating surgeons' informed decision making skills: pilot test using a videoconferenced standardised patient.

    Science.gov (United States)

    Clever, Sarah L; Novack, Dennis H; Cohen, Diane G; Levinson, Wendy

    2003-12-01

    Standardised patients (SPs) are effective in evaluating communication skills, but not every training site may have the resources to develop and maintain SP programmes. To test whether videoconferencing technology (VT) could enable an interaction between an SP and an orthopaedic surgeon that would allow the SP to accurately evaluate the surgeon's informed decision making (IDM) skills. We also assessed whether this sort of interaction was acceptable to orthopaedic surgeons as a means of learning IDM skills. We trained an SP to represent a 75-year-old woman considering hip replacement surgery. Orthopaedic surgeons in Chicago individually consulted with the SP in Philadelphia; each participant could see and hear the other on large television screens. The SP evaluated the surgeons' advice using a 23-item checklist of IDM elements, and gave each surgeon verbal and written feedback on his IDM skills. The surgeons then gave their evaluations of the exercise. Twenty-two surgeons completed the project. The SP was > or = 80% accurate in classifying 20 of the 23 IDM skills when compared to a clinician rater. Although 12 (55%) of the orthopaedic surgeons felt that some aspects of the technology were distracting, most were pleased with it, and 19 of 22 (86%) would recommend the videoconferenced SP interaction to their colleagues as a means of learning IDM skills. These results suggest that VT allows accurate evaluation of IDM skills in a format that is acceptable to orthopaedic surgeons. Videoconferencing technology may be useful in long-distance SP communication assessment for a variety of learners.

  2. A Robust Streaming Media System

    Science.gov (United States)

    Youwei, Zhang

    Presently, application layer multicast protocols (ALM) are proposed as substitute for IP multicast and have made extraordinary achievements. Integrated with Multi-data-stream mode such as Multiple Description Coding (MDC), ALM becomes more scalable and robust in high-dynamic Internet environment compared with single data stream. Although MDC can provide a flexible data transmission style, the synchronization of different descriptions encoded from one video source is proved to be difficult due to different delay on diverse transmission paths. In this paper, an ALM system called HMDC is proposed to improve accepted video quality of streaming media, hosts can join the separate overlay trees in different layers simultaneously, then the maximum synchronized descriptions of the same layer are worked out to acquire the best video quality. Simulations implemented on Internet-like topology indicate that HMDC achieves better video quality, lower link stress, higher robustness and comparable latency compared with traditional ALM protocols.

  3. Telecommunication Support System Using Keywords and Their Relevant Information in Videoconferencing — Presentation Method for Keeping Audience's Concentration at Distance Lectures

    Science.gov (United States)

    Asai, Kikuo; Kondo, Kimio; Kobayashi, Hideaki; Saito, Fumihiko

    We developed a prototype system to support telecommunication by using keywords selected by the speaker in a videoconference. In the traditional presentation style, a speaker talks and uses audiovisual materials, and the audience at remote sites looks at these materials. Unfortunately, the audience often loses concentration and attention during the talk. To overcome this problem, we investigate a keyword presentation style, in which the speaker holds keyword cards that enable the audience to see additional information. Although keyword captions were originally intended for use in video materials for learning foreign languages, they can also be used to improve the quality of distance lectures in videoconferences. Our prototype system recognizes printed keywords in a video image at a server, and transfers the data to clients as multimedia functions such as language translation, three-dimensional (3D) model visualization, and audio reproduction. The additional information is collocated to the keyword cards in the display window, thus forming a spatial relationship between them. We conducted an experiment to investigate the properties of the keyword presentation style for an audience. The results suggest the potential of the keyword presentation style for improving the audience's concentration and attention in distance lectures by providing an environment that facilitates eye contact during videoconferencing.

  4. Videoconferencing of a national program for residents on evidence-based practice: early performance evaluation.

    Science.gov (United States)

    O'Regan, Kevin; Marsden, Paul; Sayers, Gerardine; Morrissey, Mary; Hegarty, Heather; Allen, Michael; O'Connor, Owen J; Malone, Dermot; Maher, Michael M

    2010-01-01

    The aim of this study was to evaluate the effectiveness of the medium of videoconferencing for the delivery of a course for radiology residents in practice-based learning (PBL), including evidence-based practice, at centers geographically separated from the principal teaching site. Twenty-one participants (second-year radiology residents) at 8 centers in a radiology training program were included. The course in PBL was delivered over 16 weekly 1-hour sessions. There were 8 local education site coordinators (staff radiologists), who had completed an intensive 1-day course at the principal teaching site. The host site was linked to the participant sites using videoconferencing technology. Course evaluation included 1) a 5-point Likert-type scale and an open-ended evaluation questionnaire midway through the course (week 8) and a summation questionnaire after its completion (week 16) and 2) a consultation forum held during the penultimate session. The data responses to the questionnaires were entered in a spreadsheet, and the data were analyzed. Qualitative data were manually coded and analyzed for common themes. Descriptive statistical analyses were performed. Eighty-five percent of evaluation questionnaires and 53% of summation questionnaires were returned. The overall satisfaction of the participants with course content was high, with median rating of 4 on the 5-point scale. All participants agreed that videoconferencing as a medium did not hinder adequate discussion among centers and worked well as an interactive teaching method (median, 4). Local coordinators were satisfied with local technical support and training (median, 4), and overall, the module was rated highly, with ratings of 4 from both residents and local coordinators. Seventy-one percent of residents and 86% of local coordinators reported that they would have been unable to participate in the course without videoconferencing. All participants completed the course requirements satisfactorily. The

  5. Collaborative e-learning using streaming video and asynchronous discussion boards to teach the cognitive foundation of medical interviewing: a case study.

    Science.gov (United States)

    Wiecha, John M; Gramling, Robert; Joachim, Phyllis; Vanderschmidt, Hannelore

    2003-01-01

    Advances in electronic technology have created opportunities for new instructional designs of medical curricula. We created and evaluated a 4-week online elective course for medical students to teach the cognitive basis for interviewing skills. Ten students, from 2 medical schools, studied online modules on interviewing concepts and viewed videos illustrating the concepts. They then participated in asynchronous discussion groups designed to reinforce course concepts, stimulate reflective learning, and promote peer learning. In qualitative evaluations, learners reported improvements in self-awareness; increased understanding of interviewing concepts; and benefits of online learning vs face to face learning. Participants reported high levels of satisfaction with online learning and with achievement of course objectives. Self-reported knowledge scores increased significantly from pre-course completion to post-course completion. Online education has significant potential to augment curriculum on the medical interview, particularly among students trained in community settings geographically distant from their academic medical center.

  6. Optimisation du protocole TCP pour le streaming adaptatif sur HTTP

    OpenAIRE

    Ben Ameur, Chiheb

    2015-01-01

    HTTP adaptive streaming (HAS) is a streaming video technique widely used over the Internetfor Video on Demand (VoD) and Live streaming services. It employs Transmission Control Protocol(TCP) as transport protocol and it splits the original video inside the server into segments ofsame duration, called "chunks", that are transcoded into multiple quality levels. The HAS player,on the client side, requests for one chunk each chunk duration and it commonly selects the qualitylevel based on the est...

  7. Representing videos in tangible products

    Science.gov (United States)

    Fageth, Reiner; Weiting, Ralf

    2014-03-01

    Videos can be taken with nearly every camera, digital point and shoot cameras, DSLRs as well as smartphones and more and more with so-called action cameras mounted on sports devices. The implementation of videos while generating QR codes and relevant pictures out of the video stream via a software implementation was contents in last years' paper. This year we present first data about what contents is displayed and how the users represent their videos in printed products, e.g. CEWE PHOTOBOOKS and greeting cards. We report the share of the different video formats used, the number of images extracted out of the video in order to represent the video, the positions in the book and different design strategies compared to regular books.

  8. Streams with Strahler Stream Order

    Data.gov (United States)

    Minnesota Department of Natural Resources — Stream segments with Strahler stream order values assigned. As of 01/08/08 the linework is from the DNR24K stream coverages and will not match the updated...

  9. CovertCast: Using Live Streaming to Evade Internet Censorship

    National Research Council Canada - National Science Library

    Richard McPherson; Amir Houmansadr; Vitaly Shmatikov

    2016-01-01

    We design, implement, and evaluate CovertCast, a censorship circumvention system that broadcasts the content of popular websites in real-time, encrypted video streams on common live-streaming services such as YouTube...

  10. Medical oncology clinics through videoconferencing: an acceptable telehealth model for rural patients and health workers.

    Science.gov (United States)

    Sabesan, S; Simcox, K; Marr, I

    2012-07-01

    Since 2007, Townsville Cancer Centre (Queensland, Australia) has provided routine and urgent medical oncology services to rural and remote communities through videoconferencing. At remote sites, patients were accompanied by doctors and other health workers. The aim of this study was to describe satisfaction of patients and rural health workers with this model of teleoncology. Between May 2007 and June 2010, 55 videoconferencing patients were invited to participate in a questionnaire-based telephone survey after informed consent. The survey included responses to 16 satisfaction statements using a 5-point Likert scale. Perspectives of health workers involved were recorded using open-ended questions on six themes related to telehealth. Among the 50 participating cancer patients, median age was 56 years (range 28-83). Seventy-six per cent of patients thought specialist physical examination was important despite local doctors performing it. Seventy-six per cent of patients felt the presence of accompanying local health workers was not important. Seventy-eight per cent of patients preferred to be seen in Mt Isa for the first consultation through videoconferencing than travelling to Townsville. More than 80% of patients were in agreement with the rest of the satisfaction statements. Ninety-six per cent of patients were in agreement with the question relating to overall satisfaction. Eighteen health workers participated and their responses and attitudes were favourable towards telehealth. Satisfaction with this model of care was proven to be high among both patients and health workers. Benefits perceived included effective communication between patients and specialists, reduced travel time and money expenditure, and superior specialist support for rural health workers. © 2011 The Authors. Internal Medicine Journal © 2011 Royal Australasian College of Physicians.

  11. Usefulness of telepsychiatry: A critical evaluation of videoconferencing-based approaches.

    Science.gov (United States)

    Chakrabarti, Subho

    2015-09-22

    Telepsychiatry, i.e., the use of information and communication technologies to provide psychiatric services from a distance, has been around for more than half a century now. Research over this period has shown that videoconferencing-based telepsychiatry is an enabling and empowering form of service delivery, which promotes equality of access, and high levels of satisfaction among patients. The range of services offered by videoconferencing-based telepsychiatry, potential users and points of delivery of such services are theoretically limitless. Telepsychiatry has both clinical utility and non-clinical uses such as administrative, learning and research applications. A large body of accumulated evidence indicates that videoconferencing-based telepsychiatric assessments are reliable, and clinical outcomes of telepsychiatric interventions are comparable to conventional treatment among diverse patient populations, ages and diagnostic groups, and on a wide range of measures. However, on many aspects of effectiveness, the evidence base is still relatively limited and often compromised by methodological problems. The lack of cost-effectiveness data in particular, is a major hindrance, raising doubts about the continued viability of telepsychiatric services. Added to this are the vagaries of technology, negative views among clinicians, poor uptake by providers, and several legal, ethical and administrative barriers. These hamper the widespread implementation of telepsychiatry and its integration with routine care. Though further advances in technology and research are expected to solve many of these problems, the way forward would be to promote telepsychiatry as an adjunct to conventional care, and to develop hybrid models, which incorporate both traditional and telepsychiatric forms of mental health-care.

  12. IMPLEMENTATION OF HTTP LIVE STREAMING PROTOCOL IN JAVA

    OpenAIRE

    Rehar, Anže

    2012-01-01

    In this thesis we discuss protocols for streaming to mobile devices. Tremendous growth of smartphone and tablet sales numbers over the past few years push content providers to seek new ways to offer video content. However, these devices have some limitations that make the implementation of video streaming a complex project. Most depends on the streaming protocol selection. There is a set of HTTP based technologies but there are no standards for adaptive streaming to mobile devices. In thesis ...

  13. Video quality assessment for web content mirroring

    Science.gov (United States)

    He, Ye; Fei, Kevin; Fernandez, Gustavo A.; Delp, Edward J.

    2014-03-01

    Due to the increasing user expectation on watching experience, moving web high quality video streaming content from the small screen in mobile devices to the larger TV screen has become popular. It is crucial to develop video quality metrics to measure the quality change for various devices or network conditions. In this paper, we propose an automated scoring system to quantify user satisfaction. We compare the quality of local videos with the videos transmitted to a TV. Four video quality metrics, namely Image Quality, Rendering Quality, Freeze Time Ratio and Rate of Freeze Events are used to measure video quality change during web content mirroring. To measure image quality and rendering quality, we compare the matched frames between the source video and the destination video using barcode tools. Freeze time ratio and rate of freeze events are measured after extracting video timestamps. Several user studies are conducted to evaluate the impact of each objective video quality metric on the subjective user watching experience.

  14. Content-based TV sports video retrieval using multimodal analysis

    Science.gov (United States)

    Yu, Yiqing; Liu, Huayong; Wang, Hongbin; Zhou, Dongru

    2003-09-01

    In this paper, we propose content-based video retrieval, which is a kind of retrieval by its semantical contents. Because video data is composed of multimodal information streams such as video, auditory and textual streams, we describe a strategy of using multimodal analysis for automatic parsing sports video. The paper first defines the basic structure of sports video database system, and then introduces a new approach that integrates visual stream analysis, speech recognition, speech signal processing and text extraction to realize video retrieval. The experimental results for TV sports video of football games indicate that the multimodal analysis is effective for video retrieval by quickly browsing tree-like video clips or inputting keywords within predefined domain.

  15. Collaboration between Professionals: The Use of Videoconferencing for Delivering E-Health

    Directory of Open Access Journals (Sweden)

    Line Lundvoll Nilsen

    2012-04-01

    Full Text Available This article explores the ways in which collaboration between professionals using videoconferencing affects the e-health delivered to patients. In Norway, general practitioners (GPs and specialists routinely hold videoconferences. Observations of 42 VC meetings, each lasting from 5 to 40 min, were analysed in terms of the interactions. In addition, five semi-structured, face-to-face interviews were conducted, each lasting from 20 to 70 minutes. Statements were selected to illustrate the content of the interactions and how collaborative work affects the delivery of healthcare. Successful collaborative work provides practitioners with a new way of thinking: exchanging information and knowledge between levels of care in order to provide the best treatment for patients locally. The regularity makes the collaborative work a two-way achievement. GPs receive decision support and second opinions, and specialists receive information and opportunities to follow up. How the professionals manage their work (i.e., collaborating may benefit their patients. The regular use of videoconferencing will furnish professionals with enhanced resources for the meeting of patients’ demands in the future. Regularly informing one another and exchanging knowledge, benefits the professionals by providing increased certainty with regard to their medical decisions, and it benefits the patients because they will feel satisfied with the competence of the specialists where they live.

  16. Feasibility and reliability of remote assessment of PALS psychomotor skills via interactive videoconferencing.

    Science.gov (United States)

    Weeks, Douglas L; Molsberry, Dianne M

    2009-03-01

    This study determined inter-rater agreement between skill assessments provided by on-site PALS evaluators with ratings from evaluators at a remote site viewing the same skill performance over a videoconferencing network. Judgments about feasibility of remote evaluation were also obtained from the evaluators and PALS course participants. Two remote and two on-site instructors independently rated performance of 27 course participants who performed cardiac and shock/respiratory emergency core cases. Inter-rater reliability was assessed with the intraclass correlation coefficient (ICC). Feasibility was assessed with surveys of evaluators and course participants. Core cases were under the direction of the remote evaluators. The ICC for overall agreement on pass/fail decisions was 0.997 for the cardiac cases and 0.998 for the shock/respiratory cases. Perfect agreement was reached on 52 of 54 pass/fail decisions. Across all evaluators, all core cases, and all participants, 2584 ratings of individual skill criteria were provided, of which 21 (0.8%) were ratings in which a single evaluator disagreed with the other three evaluators. No trends emerged for location of the disagreeing evaluator. Survey responses indicated that remote evaluation was acceptable and feasible to course participants and to the evaluators. Videoconferencing technology was shown to provide adequate spatial and temporal resolution for PALS evaluators at-a-distance from course participants to agree with ratings of on-site evaluators.

  17. The Use of Videoconferencing as a Medium for the Qualitative Interview

    Directory of Open Access Journals (Sweden)

    Monique Sedgwick RN, PhD

    2009-03-01

    Full Text Available Qualitative data collection, especially conducting in-person interviews, presents challenges for researchers whose participants are geographically dispersed. Often alternative means of interviewing using communication technology are necessary. This was true for this focused ethnographic research exploring the experiences of participants who were connected to a particular cultural group by virtue of their similar experience but who were not located in the same geographical area. The purpose of this paper is to present the experience of using videoconferencing technology to collect experiential data from undergraduate nursing students and preceptors who were dispersed over a 640,000 square kilometer area in western and northern Canada during a rural hospital-based preceptorship. Recommendations for using videoconferencing as a medium for conducting in-depth qualitative interviews include using a high-bandwidth connection such as SuperNet or Web conferencing, and evaluating whether the type of information sought is likely to be shared in other than in-person face-to-face situations.

  18. Video microblogging

    DEFF Research Database (Denmark)

    Bornoe, Nis; Barkhuus, Louise

    2010-01-01

    Microblogging is a recently popular phenomenon and with the increasing trend for video cameras to be built into mobile phones, a new type of microblogging has entered the arena of electronic communication: video microblogging. In this study we examine video microblogging, which is the broadcasting...... of short videos. A series of semi-structured interviews offers an understanding of why and how video microblogging is used and what the users post and broadcast....

  19. Teaching Ocean Sciences in the 21st Century Classroom: Lab to Classroom Videoconferencing

    Science.gov (United States)

    Peach, C. L.; Gerwick, W.; Gerwick, L.; Senise, M.; Jones, C. S.; Malloy, K.; Jones, A.; Trentacoste, E.; Nunnery, J.; Mendibles, T.; Tayco, D.; Justice, L.; Deutscher, R.

    2010-12-01

    Teaching Ocean Science in the 21st Century Classroom (TOST) is a Center for Ocean Sciences Education Excellence (COSEE CA) initiative aimed at developing and disseminating technology-based instructional strategies, tools and ocean science resources for both formal and informal science education. San Diego Unified School District (SDUSD), Scripps Institution of Oceanography (SIO) and the Lawrence Hall of Science (LHS) have established a proving ground for TOST activities and for development of effective, sustainable solutions for researchers seeking to fulfill NSF and other funding agency broader impact requirements. Lab to Classroom Videoconferencing: Advances in Information and Communications Technology (ICT) are making it easier to connect students and researchers using simple online tools that allow them to interact in novel ways. COSEE CA is experimenting with these tools and approaches to identify effective practices for providing students with insight into the research process and close connections to researchers and their laboratory activities. At the same time researchers, including graduate students, are learning effective communication skills and how to align their presentations to specific classroom needs - all from the comfort of their own lab. The lab to classroom videoconferencing described here is an ongoing partnership between the Gerwick marine biomedical research lab and a group of three life science teachers (7th grade) at Pershing Middle School (SDUSD) that started in 2007. Over the last 5 years, the Pershing science teachers have created an intensive, semester-long unit focused on drug discovery. Capitalizing on the teacher team’s well-developed unit of study and the overlap with leading-edge research at SIO, COSEE CA created the videoconferencing program as a broader impact solution for the lab. The team has refined the program over 3 iterations, experimenting with structuring the activities to most effectively reach the students. In the

  20. How to set up a low cost tele-ultrasound capable videoconferencing system with wide applicability.

    Science.gov (United States)

    Crawford, Innes; McBeth, Paul B; Mitchelson, Mark; Ferguson, James; Tiruta, Corina; Kirkpatrick, Andrew W

    2012-05-29

    Worldwide ultrasound equipment accessibility is at an all-time high, as technology improves and costs decrease. Ensuring that patients benefit from more accurate resuscitation and diagnoses from a user-dependent technology, such as ultrasound, requires accurate examination, typically entailing significant training. Remote tele-mentored ultrasound (RTUS) examination is, however, a technique pioneered in space medicine that has increased applicability on earth. We, thus, sought to create and demonstrate a cost-minimal approach and system with potentially global applicability. The cost-minimal RTUS system was constructed by utilizing a standard off-the-shelf laptop computer that connected to the internet through an internal wireless receiver and/or was tethered through a smartphone. A number of portable hand-held ultrasound devices were digitally streamed into the laptop utilizing a video converter. Both the ultrasound video and the output of a head-mounted video camera were transmitted over freely available Voice Over Internet Protocol (VOIP) software to remote experts who could receive and communicate using any mobile device (computer, tablet, or smartphone) that could access secure VOIP transmissions from the internet. The RTUS system allowed real-time mentored tele-ultrasound to be conducted from a variety of settings that were inside buildings, outside on mountainsides, and even within aircraft in flight all unified by the simple capability of receiving and transmitting VOIP transmissions. . Numerous types of ultrasound examinations were conducted such as abdominal and thoracic examinations with a variety of users mentored who had previous skills ranging from none to expert. Internet connectivity was rarely a limiting factor, with competing logistical and scheduling demands of the participants predominating. RTUS examinations can educate and guide point of care clinical providers to enhance their use of ultrasound. The scope of the examinations conducted is

  1. A video event trigger for high frame rate, high resolution video technology

    Science.gov (United States)

    Williams, Glenn L.

    1991-01-01

    When video replaces film the digitized video data accumulates very rapidly, leading to a difficult and costly data storage problem. One solution exists for cases when the video images represent continuously repetitive 'static scenes' containing negligible activity, occasionally interrupted by short events of interest. Minutes or hours of redundant video frames can be ignored, and not stored, until activity begins. A new, highly parallel digital state machine generates a digital trigger signal at the onset of a video event. High capacity random access memory storage coupled with newly available fuzzy logic devices permits the monitoring of a video image stream for long term or short term changes caused by spatial translation, dilation, appearance, disappearance, or color change in a video object. Pretrigger and post-trigger storage techniques are then adaptable for archiving the digital stream from only the significant video images.

  2. Incorporating Cross-Cultural Videoconferencing to Enhance Content and Language Integrated Learning (CLIL) at the Tertiary Level

    Science.gov (United States)

    Loranc-Paszylk, Barbara

    2016-01-01

    This paper attempts to provide evidence of cross-cultural videoconferencing affordances with reference to a Content and Language Integrated Learning (CLIL) context at the tertiary level. At the core of CLIL lie student-centered paradigms of teaching methodologies that invite task and project work and authentic and meaningful communication, while…

  3. Stream Crossings

    Data.gov (United States)

    Vermont Center for Geographic Information — Physical measurements and attributes of stream crossing structures and adjacent stream reaches which are used to provide a relative rating of aquatic organism...

  4. Online video examination

    DEFF Research Database (Denmark)

    Qvist, Palle

    courses are accredited to the master programme. The programme is online, worldwide and on demand. It recruits students from all over the world. The programme is organized exemplary in accordance the principles in the problem-based and project-based learning method used at Aalborg University where students......The Master programme in Problem-Based Learning in Engineering and Science, MPBL (www.mpbl.aau.dk), at Aalborg University, is an international programme offering formalized staff development. The programme is also offered in smaller parts as single subject courses (SSC). Passed single subject...... have large influence on their own teaching, learning and curriculum. The programme offers streamed videos in combination with other learning resources. It is a concept which offers video as pure presentation - video lectures - but also as an instructional tool which gives the students the possibility...

  5. Video as a Means for the Academic Improvement of a Profession

    DEFF Research Database (Denmark)

    Buhl, Mie

    2013-01-01

    Video as a means for learning is a growing field in Danish university education. Different settings that include videos, such as video conferences or video streaming, have been tried out in order to overcome distances between teachers and learners. But video is also used as a means for facilitating...

  6. 4K Video Traffic Prediction using Seasonal Autoregressive Modeling

    Directory of Open Access Journals (Sweden)

    D. R. Marković

    2017-06-01

    Full Text Available From the perspective of average viewer, high definition video streams such as HD (High Definition and UHD (Ultra HD are increasing their internet presence year over year. This is not surprising, having in mind expansion of HD streaming services, such as YouTube, Netflix etc. Therefore, high definition video streams are starting to challenge network resource allocation with their bandwidth requirements and statistical characteristics. Need for analysis and modeling of this demanding video traffic has essential importance for better quality of service and experience support. In this paper we use an easy-to-apply statistical model for prediction of 4K video traffic. Namely, seasonal autoregressive modeling is applied in prediction of 4K video traffic, encoded with HEVC (High Efficiency Video Coding. Analysis and modeling were performed within R programming environment using over 17.000 high definition video frames. It is shown that the proposed methodology provides good accuracy in high definition video traffic modeling.

  7. Video Conferencing for Opening Classroom Doors in Initial Teacher Education: Sociocultural Processes of Mimicking and Improvisation

    Directory of Open Access Journals (Sweden)

    Rolf Wiesemes

    2010-11-01

    Full Text Available In this article, we present an alternative framework for conceptualising video-conferencing uses in initial teacher education and in Higher Education (HE more generally. This alternative framework takes into account the existing models in the field, but – based on a set of interviews conducted with teacher trainees and wider analysis of the related literature – we suggest that there is a need to add to existing models the notions of ‘mimicking’ (copying practice and improvisation (unplanned and spontaneous personal learning moments. These two notions are considered to be vital, as they remain valid throughout teachers’ careers and constitute key affordances of video-conferencing uses in HE. In particular, we argue that improvisational processes can be considered as key for developing professional practice and lifelong learning and that video-conferencing uses in initial teacher education can contribute to an understanding of training and learning processes. Current conceptualisations of video conferencing as suggested by Coyle (2004 and Marsh et al. (2009 remain valid, but also are limited in their scope with respect to focusing predominantly on pragmatic and instrumental teacher-training issues. Our article suggests that the theoretical conceptualisations of video conferencing should be expanded to include elements of mimicking and ultimately improvisation. This allows us to consider not just etic aspects of practice, but equally emic practices and related personal professional development. We locate these arguments more widely in a sociocultural-theory framework, as it enables us to describe interactions in dialectical rather than dichotomous terms (Lantolf & Poehner, 2008.

  8. Video Conferencing for Opening Classroom Doors in Initial Teacher Education: Sociocultural Processes of Mimicking and Improvisation

    Directory of Open Access Journals (Sweden)

    Wiesemes, Rolf

    2010-01-01

    Full Text Available In this article, we present an alternative framework for conceptualising video-conferencing uses in initial teacher education and in Higher Education (HE more generally. This alternative framework takes into account the existing models in the field, but – based on a set of interviews conducted with teacher trainees and wider analysis of the related literature – we suggest that there is a need to add to existing models the notions of ‘mimicking’ (copying practice and improvisation (unplanned and spontaneous personal learning moments. These two notions are considered to be vital, as they remain valid throughout teachers’ careers and constitute key affordances of video-conferencing uses in HE. In particular, we argue that improvisational processes can be considered as key for developing professional practice and lifelong learning and that video-conferencing uses in initial teacher education can contribute to an understanding of training and learning processes. Current conceptualisations of video conferencing as suggested by Coyle (2004 and Marsh et al. (2009 remain valid, but also are limited in their scope with respect to focusing predominantly on pragmatic and instrumental teacher-training issues. Our article suggests that the theoretical conceptualisations of video conferencing should be expanded to include elements of mimicking and ultimately improvisation. This allows us to consider not just etic aspects of practice, but equally emic practices and related personal professional development. We locate these arguments more widely in a sociocultural-theory framework, as it enables us to describe interactions in dialectical rather than dichotomous terms (Lantolf & Poehner, 2008.

  9. Automated analysis and annotation of basketball video

    Science.gov (United States)

    Saur, Drew D.; Tan, Yap-Peng; Kulkarni, Sanjeev R.; Ramadge, Peter J.

    1997-01-01

    Automated analysis and annotation of video sequences are important for digital video libraries, content-based video browsing and data mining projects. A successful video annotation system should provide users with useful video content summary in a reasonable processing time. Given the wide variety of video genres available today, automatically extracting meaningful video content for annotation still remains hard by using current available techniques. However, a wide range video has inherent structure such that some prior knowledge about the video content can be exploited to improve our understanding of the high-level video semantic content. In this paper, we develop tools and techniques for analyzing structured video by using the low-level information available directly from MPEG compressed video. Being able to work directly in the video compressed domain can greatly reduce the processing time and enhance storage efficiency. As a testbed, we have developed a basketball annotation system which combines the low-level information extracted from MPEG stream with the prior knowledge of basketball video structure to provide high level content analysis, annotation and browsing for events such as wide- angle and close-up views, fast breaks, steals, potential shots, number of possessions and possession times. We expect our approach can also be extended to structured video in other domains.

  10. Classification-based Multi-client Video Transmission over Heterogeneous Networks

    OpenAIRE

    Bo Li; Peng Wang; Yongfei Zhang

    2013-01-01

    These Real-time video streaming over networks operates under stringent network resource constraints, with multiple video clients competing for limited network resources. In this paper, we study the problem of bandwidth allocation for video transmission over heterogeneous networks, with multiple video clients connecting to the video server simultaneously and demanding for the video services, and aim to provide the best possible Quality of Service (QoS) under limited bandwidth of both the video...

  11. Use of videoconferencing in Wales to reduce carbon dioxide emissions, travel costs and time.

    Science.gov (United States)

    Lewis, Delyth; Tranter, Glynis; Axford, Alan T

    2009-01-01

    In September 2005 a telemedicine service was started to assist multidisciplinary teams in Wales to improve cancer services. In October 2006 and October 2007 users of videoconferencing equipment at one site completed questionnaires. During October 2006 a total of 18,000 km of car travel were avoided, equivalent to 1696 kg of CO(2) emission. During October 2007 a total of 20,800 km of car travel were avoided, equivalent to 2590 kg of CO(2) emission. We estimate that 48 trees would take a year to absorb that quantity of CO(2). The results of the surveys show that exploiting telemedicine makes better use of staff time, reduces the time spent travelling and assists in reducing climate change by limiting the emissions of CO(2).

  12. Watermarking textures in video games

    Science.gov (United States)

    Liu, Huajian; Berchtold, Waldemar; Schäfer, Marcel; Lieb, Patrick; Steinebach, Martin

    2014-02-01

    Digital watermarking is a promising solution to video game piracy. In this paper, based on the analysis of special challenges and requirements in terms of watermarking textures in video games, a novel watermarking scheme for DDS textures in video games is proposed. To meet the performance requirements in video game applications, the proposed algorithm embeds the watermark message directly in the compressed stream in DDS files and can be straightforwardly applied in watermark container technique for real-time embedding. Furthermore, the embedding approach achieves high watermark payload to handle collusion secure fingerprinting codes with extreme length. Hence, the scheme is resistant to collusion attacks, which is indispensable in video game applications. The proposed scheme is evaluated in aspects of transparency, robustness, security and performance. Especially, in addition to classical objective evaluation, the visual quality and playing experience of watermarked games is assessed subjectively in game playing.

  13. ARBITER: Adaptive rate-based intelligent HTTP streaming algorithm

    OpenAIRE

    Zahran, Ahmed H.; Sreenan, Cormac J.

    2016-01-01

    Dynamic Adaptive streaming over HTTP (DASH) is widely used by content providers for video delivery and dominates traffic on cellular networks. The inherent variability in both video bitrate and network bandwidth negatively impacts the user Quality of Experience (QoE), motivating the design of better DASH-compliant adaptation algorithms. In this paper we present ARBITER, a novel streaming adaptation algorithm that explicitly integrates the variations in both video and network dynamics in its a...

  14. Digital video.

    Science.gov (United States)

    Johnson, Don; Johnson, Mike

    2004-04-01

    The process of digital capture, editing, and archiving video has become an important aspect of documenting arthroscopic surgery. Recording the arthroscopic findings before and after surgery is an essential part of the patient's medical record. The hardware and software has become more reasonable to purchase, but the learning curve to master the software is steep. Digital video is captured at the time of arthroscopy to a hard disk, and written to a CD at the end of the operative procedure. The process of obtaining video of open procedures is more complex. Outside video of the procedure is recorded on digital tape with a digital video camera. The camera must be plugged into a computer to capture the video on the hard disk. Adobe Premiere software is used to edit the video and render the finished video to the hard drive. This finished video is burned onto a CD. We outline the choice of computer hardware and software for the manipulation of digital video. The techniques of backup and archiving the completed projects and files also are outlined. The uses of digital video for education and the formats that can be used in PowerPoint presentations are discussed.

  15. Geoblocking and global video culture.

    NARCIS (Netherlands)

    Lobato, Ramon; Meese, James; Rasch, Mirjam

    How do global audiences use streaming platforms like YouTube, Netflix and iPlayer? How does the experience of digital video change according to location? What strategies do people use to access out-of-region content? What are the commercial and governmental motivations behind geoblocking?

  16. Digital Video: Get with It!

    Science.gov (United States)

    Van Horn, Royal

    2001-01-01

    Several years after the first audiovisual Macintosh computer appeared, most educators are still oblivious of this technology. Almost every other economic sector (including the porn industry) makes abundant use of digital and streaming video. Desktop movie production is so easy that primary grade students can do it. Tips are provided. (MLH)

  17. Technology Support for Relation Work in Video Meetings

    DEFF Research Database (Denmark)

    Esbensen, Morten; Bardram, Jakob

    Distributed collaboration has a number of problems associated with it. One of these problems is the fact that distributed actors have to engage in explicit work to achieve the connections between them needed in a collaboration. The work of creating these connections have been named relation work....... Relation work is performed throughout a collaboration, however it is especially interesting to investigate in the context of the video meeting. This report asks the question “How can we design support for relation work in distributed video meetings?”. The two main contributions of this report are; (i......) the design, implementation and evaluation of SideBar - a videoconferencing system supporting relation work, and (ii) the proposal of three guidelines relevant for the design of relation work support....

  18. MULTI-CULTURAL INTERACTION THROUGH VIDEO CONFERENCING IN PRIMARY SCHOOLS

    Directory of Open Access Journals (Sweden)

    Suzan DUYGU ERIŞTI

    2012-07-01

    Full Text Available This study investigated Turkish and Canadian primary school students’ ways of expressing their perception of cultural understanding through video conferencing and that of cultural interaction through video conferencing. The qualitative research data were collected in the form of interviews. The results obtained were analyzed and interpreted based on the quantitative content analysis method. The research results revealed that the majority of the students explained their viewpoints through the effectiveness of the process. The students highlighted the importance of learning a different culture, using technology effective and recognizing new friends in the process. Most of the students indicated that videoconferencing encouraged them to learn and understand about different cultures, helped them develop cultural awareness, attracted their attention and increased their motivation.

  19. Mobile video with mobile IPv6

    CERN Document Server

    Minoli, Daniel

    2012-01-01

    Increased reliance on mobile devices and streaming of video content are two of the most recent changes that have led those in the video distribution industry to be concerned about the shifting or erosion of traditional advertising revenues. Infrastructure providers also need to position themselves to take advantage of these trends. Mobile Video with Mobile IPv6provides an overview of the current mobile landscape, then delves specifically into the capabilities and operational details of IPv6. The book also addresses 3G and 4G services, the application of Mobile IPv6 to streaming and other mobil

  20. Video time encoding machines.

    Science.gov (United States)

    Lazar, Aurel A; Pnevmatikakis, Eftychios A

    2011-03-01

    We investigate architectures for time encoding and time decoding of visual stimuli such as natural and synthetic video streams (movies, animation). The architecture for time encoding is akin to models of the early visual system. It consists of a bank of filters in cascade with single-input multi-output neural circuits. Neuron firing is based on either a threshold-and-fire or an integrate-and-fire spiking mechanism with feedback. We show that analog information is represented by the neural circuits as projections on a set of band-limited functions determined by the spike sequence. Under Nyquist-type and frame conditions, the encoded signal can be recovered from these projections with arbitrary precision. For the video time encoding machine architecture, we demonstrate that band-limited video streams of finite energy can be faithfully recovered from the spike trains and provide a stable algorithm for perfect recovery. The key condition for recovery calls for the number of neurons in the population to be above a threshold value.

  1. Stream systems.

    Science.gov (United States)

    Jack E. Williams; Gordon H. Reeves

    2006-01-01

    Restored, high-quality streams provide innumerable benefits to society. In the Pacific Northwest, high-quality stream habitat often is associated with an abundance of salmonid fishes such as chinook salmon (Oncorhynchus tshawytscha), coho salmon (O. kisutch), and steelhead (O. mykiss). Many other native...

  2. Performance Analysis of Video Transmission Using Sequential Distortion Minimization Method for Digital Video Broadcasting Terrestrial

    Directory of Open Access Journals (Sweden)

    Novita Astin

    2016-12-01

    Full Text Available This paper presents about the transmission of Digital Video Broadcasting system with streaming video resolution 640x480 on different IQ rate and modulation. In the video transmission, distortion often occurs, so the received video has bad quality. Key frames selection algorithm is flexibel on a change of video, but on these methods, the temporal information of a video sequence is omitted. To minimize distortion between the original video and received video, we aimed at adding methodology using sequential distortion minimization algorithm. Its aim was to create a new video, better than original video without significant loss of content between the original video and received video, fixed sequentially. The reliability of video transmission was observed based on a constellation diagram, with the best result on IQ rate 2 Mhz and modulation 8 QAM. The best video transmission was also investigated using SEDIM (Sequential Distortion Minimization Method and without SEDIM. The experimental result showed that the PSNR (Peak Signal to Noise Ratio average of video transmission using SEDIM was an increase from 19,855 dB to 48,386 dB and SSIM (Structural Similarity average increase 10,49%. The experimental results and comparison of proposed method obtained a good performance. USRP board was used as RF front-end on 2,2 GHz.

  3. Distance learning and academic performance in accounting: a comparative study of the effect of the use of videoconferencing

    Directory of Open Access Journals (Sweden)

    José Antonio Donoso Anes

    2012-12-01

    Full Text Available Background. The specific needs of some universities (attending several campuses, as well as the demands of adapting to the EHEA ( in order to achieve better coordination among universities in joint programmes and projects could be efficiently solved by using Information and Communication Technologies and distance learning tools. In this context, the efficiency of such solutions is a relevant question.Aims. The evaluation of the relative efficacy, in terms of academic performance, of videoconferencing in the teaching of accounting at university level.Method. A large dataset, including current academic performance, previous academic performance and other relevant factors, for students in groups using videoconferencing and traditional methods was built. Multivariate analyses were performed in order to test whether students at videoconferencing groups presented significant differences in performance.Results. The results indicated that videoconferencing does not negatively affect students’ performances.RESUMENLas necesidades de determinadas universidades (atendiendo docencia en varios campus así como las demandas resultantes de la adaptación al EEES (coordinación inter-universitaria, promoción de programas y proyectos conjuntos, etc. pueden resolverse de forma eficiente utilizando herramientas de educación a distancia y tecnologías de comunicación. En este contexto, la eficiencia de estas soluciones es un factor relevante.El principal objetivo de este trabajo es evaluar la eficiencia de la videoconferencia, en términos de rendimiento académico, en su uso en educación superior en contabilidad.Como método, se comparan los resultados obtenidos por grupos siguiendo un esquema tradicional con otros grupos que han utilizado videoconferencia.Los resultados indican que el uso de videoconferencia no afecta al rendimiento de los alumnos que han utilizado este método.

  4. Transatlantic medical consultation and second opinion in pediatric cardiology has benefit past patient care: A case study in videoconferencing.

    Science.gov (United States)

    Kovacikova, Lubica; Zahorec, Martin; Skrak, Peter; Hanna, Brian D; Lee Vogel, R

    2017-07-01

    Telemedicine is a rapidly evolving form of modern information and communication technology used to deliver clinical services and educational activities. The aim of this article is to report and analyze our experience with transatlantic consultation via videoconferencing in pediatric cardiology. In February, 2013, videoconferencing project was launched between a medium-volume pediatric cardiac center in Bratislava, Slovakia and subspecialty experts from a high-volume pediatric cardiac program at The Children's Hospital of Philadelphia (CHOP), USA. During 1.5-2 hours videoconferences, 2-3 patients with similar complex clinical scenarios were presented to CHOP experts. The main goal of the project was consultation on individual patients to validate, alter or radically change clinical management plans. From February, 2013 to January, 2017, 25 videoconferences occurred and 73 cases were discussed. The median patient age was 52 months (range; 1 day-30 years). Forty-six discussed cases were outpatients, 21 patients were in the intensive care unit and 6 patients were discussed post mortem. Thirty-one CHOP experts from different subspecialties participated actively in patient consultations. The most frequent recommendations were related to single ventricle, pulmonary hypertension or heart failure patients and intervention in complex and/or rare cardiac diseases. Specialists from CHOP agreed completely with the original care plan in 16% of cases. In 52% cases, adjustments to original plan were suggested. Radical changes were recommended in 30% of cases. Receiving institution adopted recommendations to the patient care fully in 79% and partially in 13% of patients. Based on our 4-year experience we consider videoconferencing between medium-size pediatric cardiac center and subspecialty experts from a high-volume pediatric cardiac program a suitable form of medical consultations. Videoconferencing assists in clinical decision making for complex patient cases and serves as an

  5. Video games

    OpenAIRE

    Kolář, Vojtěch

    2012-01-01

    This thesis is based on a detailed analysis of various topics related to the question of whether video games can be art. In the first place it analyzes the current academic discussion on this subject and confronts different opinions of both supporters and objectors of the idea, that video games can be a full-fledged art form. The second point of this paper is to analyze the properties, that are inherent to video games, in order to find the reason, why cultural elite considers video games as i...

  6. A study on the effectiveness of videoconferencing on teaching parent training skills to parents of children with ADHD.

    Science.gov (United States)

    Xie, Yuhuan; Dixon, J Faye; Yee, Ong Min; Zhang, Junshun; Chen, Y Ann; Deangelo, Sascha; Yellowlees, Peter; Hendren, Robert; Schweitzer, Julie B

    2013-03-01

    Many geographic locations are without services and staff available to provide treatment for children with attention deficit hyperactivity disorder (ADHD). This is a randomized controlled trial to evaluate the effectiveness of group parent training on ADHD treatment delivered via videoconferencing. Twenty-two subjects were enrolled in the study, with 9 subjects in the videoconference session (treatment group) and 13 in the face-to-face session (control group). The parent child relationship questionnaire for child and adolescents (PCQ-CA), Vanderbilt assessment scales (parent and teacher versions), children global assessment scale, clinical global impression-severity score, clinical global impression-improvement score, and social skills rating system assessed the effectiveness of the treatment. A Likert scale evaluated parents' acceptance of the training modality. Our results showed that the parent training program significantly improved parents' disciplinary practices based on the PRQ-CA, parent ratings of ADHD, oppositional defiant disorder, and conduct disorder symptoms, and the children's global functioning. The treatment effects did not differ between the videoconference and face-to-face groups; however, the videoconference group evidenced statistically greater improvement on the hyperactive symptoms of Vanderbilt assessment scales. Our findings suggest that parent training through a videoconferencing modality may be as effective as face-to-face training and is well accepted by parents. Parent training via videoconferencing may be an important tool for addressing ADHD in geographic locations that do not have access to appropriate treatment providers.

  7. Quality of Experience Assessment of Video Quality in Social Clouds

    Directory of Open Access Journals (Sweden)

    Asif Ali Laghari

    2017-01-01

    Full Text Available Video sharing on social clouds is popular among the users around the world. High-Definition (HD videos have big file size so the storing in cloud storage and streaming of videos with high quality from cloud to the client are a big problem for service providers. Social clouds compress the videos to save storage and stream over slow networks to provide quality of service (QoS. Compression of video decreases the quality compared to original video and parameters are changed during the online play as well as after download. Degradation of video quality due to compression decreases the quality of experience (QoE level of end users. To assess the QoE of video compression, we conducted subjective (QoE experiments by uploading, sharing, and playing videos from social clouds. Three popular social clouds, Facebook, Tumblr, and Twitter, were selected to upload and play videos online for users. The QoE was recorded by using questionnaire given to users to provide their experience about the video quality they perceive. Results show that Facebook and Twitter compressed HD videos more as compared to other clouds. However, Facebook gives a better quality of compressed videos compared to Twitter. Therefore, users assigned low ratings for Twitter for online video quality compared to Tumblr that provided high-quality online play of videos with less compression.

  8. Implementation and Analysis of Real-Time Streaming Protocols.

    Science.gov (United States)

    Santos-González, Iván; Rivero-García, Alexandra; Molina-Gil, Jezabel; Caballero-Gil, Pino

    2017-04-12

    Communication media have become the primary way of interaction thanks to the discovery and innovation of many new technologies. One of the most widely used communication systems today is video streaming, which is constantly evolving. Such communications are a good alternative to face-to-face meetings, and are therefore very useful for coping with many problems caused by distance. However, they suffer from different issues such as bandwidth limitation, network congestion, energy efficiency, cost, reliability and connectivity. Hence, the quality of service and the quality of experience are considered the two most important issues for this type of communication. This work presents a complete comparative study of two of the most used protocols of video streaming, Real Time Streaming Protocol (RTSP) and the Web Real-Time Communication (WebRTC). In addition, this paper proposes two new mobile applications that implement those protocols in Android whose objective is to know how they are influenced by the aspects that most affect the streaming quality of service, which are the connection establishment time and the stream reception time. The new video streaming applications are also compared with the most popular video streaming applications for Android, and the experimental results of the analysis show that the developed WebRTC implementation improves the performance of the most popular video streaming applications with respect to the stream packet delay.

  9. Stream Evaluation

    Data.gov (United States)

    Kansas Data Access and Support Center — Digital representation of the map accompanying the "Kansas stream and river fishery resource evaluation" (R.E. Moss and K. Brunson, 1981.U.S. Fish and Wildlife...

  10. Evaluating and Implementing JPEG XR Optimized for Video Surveillance

    OpenAIRE

    Yu, Lang

    2010-01-01

    This report describes both evaluation and implementation of the new coming image compression standard JPEG XR. The intention is to determine if JPEG XR is an appropriate standard for IP based video surveillance purposes. Video surveillance, especially IP based video surveillance, currently has an increasing role in the security market. To be a good standard for surveillance, the video stream generated by the camera is required to be low bit-rate, low latency on the network and at the same tim...

  11. Inhaler Training Delivered by Internet-Based Home Videoconferencing Improves Technique and Quality of Life.

    Science.gov (United States)

    Thomas, Rachel M; Locke, Emily R; Woo, Deborah M; Nguyen, Ethan H K; Press, Valerie G; Layouni, Troy A; Trittschuh, Emily H; Reiber, Gayle E; Fan, Vincent S

    2017-11-01

    COPD is common, and inhaled medications can reduce the risk of exacerbations. Incorrect inhaler use is also common and may lead to worse symptoms and increased exacerbations. We examined whether inhaler training could be delivered using Internet-based home videoconferencing and its effect on inhaler technique, self-efficacy, quality of life, and adherence. In this pre-post pilot study, participants with COPD had 3 monthly Internet-based home videoconference visits with a pharmacist who provided inhaler training using teach-to-goal methodology. Participants completed mailed questionnaires to ascertain COPD severity, self-efficacy, health literacy, quality of life, adherence, and satisfaction with the intervention. A total of 41 participants completed at least one, and 38 completed all 3 home videoconference visits. During each visit, technique improved for all inhalers, with significant improvements for the albuterol metered-dose inhaler, budesonide/formoterol metered-dose inhaler, and tiotropium dry powder inhaler. Improved technique was sustained for nearly all inhalers at 1 and 2 months. Quality of life measured with the Chronic Respiratory Questionnaire improved following the training: dyspnea (+0.3 points, P = .01), fatigue (+0.6 points, P training using teach-to-goal methodology delivered by home videoconference is a promising means to provide training to patients with COPD that can improve technique, quality of life, self-efficacy, and adherence. Copyright © 2017 by Daedalus Enterprises.

  12. Multicomponent cognitive-behavioral therapy for intermittent explosive disorder by videoconferencing: a case study

    Directory of Open Access Journals (Sweden)

    Jorge Osma

    Full Text Available Cognitive-behavioral Therapy (CBT for the treatment of Intermittent Explosive Disorder (IED has proved to be effective, with moderate to large effect sizes both in individual and group interventions. Videoconferencing has been used effectively to treat different mental disorders but its use for IED patients is as yet unknown. The aim of this study is to provide preliminary evidence of the possibility of treating IED by videoconference. We present a case-study experiment of a Spanish male, aged 33 years, living and working in China. After the intervention, the patient's aggressive episodes decreased dramatically, as well as his negative affect. In contrast, he showed an important increment in positive emotions and self-esteem. There were also positive changes in some personality dimensions and facets measured by NEO-PI-R, specifically in neuroticism, extraversion, and agreeableness. The benefits were maintained at 3-, 8- and 18-month follow-ups. These preliminary results reveal that CBT by videoconference oriented to increasing emotion regulation skills was effective when implemented in a case study of a person suffering from IED.

  13. Interpreter perspectives of in-person, telephonic, and videoconferencing medical interpretation in clinical encounters

    Science.gov (United States)

    Price, Erika Leemann; Pérez-Stable, Eliseo J.; Nickleach, Dana; López, Monica; Karliner, Leah S.

    2014-01-01

    Objective To examine professional medical interpreters’ perspectives of in-person and remote interpreting modalities. Methods Survey of interpreters at three medical centers assessing satisfaction with aspects of communication using each modality, and adequacy of videoconferencing medical interpretation (VMI) and telephonic interpretation for 21 common clinical scenarios in the hospital and ambulatory care settings. Results 52 interpreters completed the survey (73% response). All modalities were equally satisfactory for conveying information. Respondents favored in-person to telephonic interpretation for establishing rapport (95% versus 71%, p = .002) and for facilitating clinician understanding of patients’ social and cultural backgrounds (92% versus 69%, p = .002). Scenarios with substantial educational or psychosocial dimensions had no more than 70% of respondents rating telephonic interpretation as adequate (25–70%); for all of these scenarios, VMI represented an improvement (52–87%). Conclusion From the interpreter perspective, telephonic interpretation is satisfactory for information exchange, but less so for interpersonal aspects of communication. In scenarios where telephonic interpretation does not suffice, particularly those with substantial educational or psychosocial components, VMI offers improved communication. Practice implications Differences in interpreters’ perspectives of modalities based on communication needs and clinical scenario suggest mixed use of multiple modalities may be the best language access strategy. PMID:21930360

  14. VIDEOCONFERENCING ON EDUCATION: A CASE STUDY WITH TEACHERS OF BASIC EDUCATION

    Directory of Open Access Journals (Sweden)

    Paulo Sérgio Garcia

    2013-12-01

    Full Text Available This study investigated teachers’ objectives for using videoconferencing (VC, their forms of use, and advantages and difficulties faced in the context of public schools. It was also analyzed VC contribution to teacher education and the skills that teachers require to use it. It was used interviews with 17 teachers who participated in projects. The data analyzed qualitatively revealed that teachers had objectives related to the expansion of the content, the study of other cultures, the creation of new teaching methods and techniques, the encouragement of the students in decision-making, and the motivation of the students. Forms of use were associated with lectures and talks delivered by experts. Among the main difficulties were the lack of support and time for teacher planning his activities, and lack of technical support. The VC can contribute with teacher education in updating teacher knowledge, and in the process of learning how to use new technologies. Among the competencies required are: master the use of technologies, control physical space, and master the strategies of dynamics of the use. The results promote further discussions on teaching practices and classroom management, both in pre-service and in-service education.

  15. Effective web videoconferencing for proctoring online oral exams: a case study at scale in Brazil

    Directory of Open Access Journals (Sweden)

    Alexandra Okada

    2015-07-01

    Full Text Available The challenging of assessing formal and informal online learning at scale includes various issues. Many universities who are now promoting “Massive Online Open Courses” (MOOC, for instance, focus on relatively informal assessment of participant competence, which is not highly ‘quality assured’. This paper reports best practices on the use of a web videoconferencing application to quality control student assignments through online oral examination at scale. In this case study, we examine the use of a simple online conferencing technology FlashMeeting (FM by a Brazilian University to provide ‘quality assurance’ in the assessment of twelve online postgraduate courses in Law for 20,000 students. Our research questions investigate the benefits and recommendations of using FM in online oral exams at scale. Our qualitative and quantitative data analysis centres on 3,462 short format interviews through FM conducted for this purpose by a group of around fifty assessors from September 2008 to September 2012. The effective use of FM provided evidence with respect to high quality assurance recognised by the Institution with respect to: students’ identity, their knowledge and ownership of written work. The key benefits identified from the perspective of assessors and students were: reliable examination, credible technology, authentic assessment, interactive e-Viva, low cost, scalable process and practical testing in terms of time, effort and money.

  16. THE RELATIONSHIP BETWEEN TEACHER IMMEDIACY BEHAVIOURS AND DISTANT LEARNERS’ SOCIAL PRESENCE PERCEPTIONS IN VIDEOCONFERENCING APPLICATIONS

    Directory of Open Access Journals (Sweden)

    Mujgan BOZKAYA

    2008-01-01

    Full Text Available ABSTRACTVideoconferencing systems combine face-to-face and mediated interactions in distance education. We extend the use of a Social Presence measure to on-site (face-to-face learners and distant learners. Comparison between physically present and distant located learners did not indicate significant differences in social presence. Also results indicate that the predicted social presence score for distance instruction is slightly lower than for the on-site instruction for high nonverbal behavior while the reverse is true of low non verbal behaviors. Predicted social presence for face to face instruction is quite higher than for the distance instruction for the high verbal behaviors while the reverse is true of low verbal behaviors. It means that students’ social presence is predicted to be higher in the face to face setting comparing to the videoconferencing course in both models. Additionally, when both nonverbal and verbal behaviors increase, the predicted social presence is facilitated, controlling for the grouping variable. In other words, instructors’ nonverbal and verbal communication skills enhance learners’ social presence in either environment.

  17. Hardware architectures for real time processing of High Definition video sequences

    OpenAIRE

    Genovese, Mariangela

    2014-01-01

    Actually, application fields, such as medicine, space exploration, surveillance, authentication, HDTV, and automated industry inspection, require capturing, storing and processing continuous streams of video data. Consequently, different process techniques (video enhancement, segmentation, object detection, or video compression, as examples) are involved in these applications. Such techniques often require a significant number of operations depending on the algorithm complexity and the video ...

  18. Video as a technology for interpersonal communications: a new perspective

    Science.gov (United States)

    Whittaker, Steve

    1995-03-01

    Some of the most challenging multimedia applications have involved real- time conferencing, using audio and video to support interpersonal communication. Here we re-examine assumptions about the role, importance and implementation of video information in such systems. Rather than focussing on novel technologies, we present evaluation data relevant to both the classes of real-time multimedia applications we should develop and their design and implementation. Evaluations of videoconferencing systems show that previous work has overestimated the importance of video at the expense of audio. This has strong implications for the implementation of bandwidth allocation and synchronization. Furthermore our recent studies of workplace interaction show that prior work has neglected another potentially vital function of visual information: in assessing the communication availability of others. In this new class of application, rather than providing a supplement to audio information, visual information is used to promote the opportunistic communications that are prevalent in face-to-face settings. We discuss early experiments with such connection applications and identify outstanding design and implementation issues. Finally we examine a different class of application 'video-as-data', where the video image is used to transmit information about the work objects themselves, rather than information about interactants.

  19. Fragile watermarking scheme for H.264 video authentication

    Science.gov (United States)

    Wang, Chuen-Ching; Hsu, Yu-Chang

    2010-02-01

    A novel H.264 advanced video coding fragile watermarking method is proposed that enables the authenticity and integrity of the video streams to be verified. The effectiveness of the proposed scheme is demonstrated by way of experimental simulations. The results show that by embedding the watermark information in the last nonzero-quantized coefficient in each discrete cosine transform block, the proposed scheme induces no more than a minor distortion of the video content. In addition, we show that the proposed scheme is able to detect unauthorized changes in the watermarked video content without the original video. The experimental results demonstrate the feasibility of the proposed video authentication system.

  20. NASA Research Being Shared Through Live, Interactive Video Tours

    Science.gov (United States)

    Petersen, Ruth A.; Zona, Kathleen A.

    2001-01-01

    On June 2, 2000, the NASA Glenn Research Center Learning Technologies Project (LTP) coordinated the first live remote videoconferencing broadcast from a Glenn facility. The historic event from Glenn's Icing Research Tunnel featured wind tunnel technicians and researchers performing an icing experiment, obtaining results, and discussing the relevance to everyday flight operations and safety. After a brief overview of its history, students were able to "walk through" the tunnel, stand in the control room, and observe a live icing experiment that demonstrated how ice would grow on an airplane wing in flight through an icing cloud. The tour was interactive, with a spirited exchange of questions and explanations between the students and presenters. The virtual tour of the oldest and largest refrigerated icing research tunnel in the world was the second of a series of videoconferencing connections with the AP Physics students at Bay Village High School, Bay Village, Ohio. The first connection, called Aircraft Safety and Icing Research, introduced the Tailplane Icing Program. In an effort to improve aircraft safety by reducing the number of in-flight icing events, Glenn's Icing Branch uses its icing research aircraft to conduct flight tests. The presenter engaged the students in discussions of basic aircraft flight mechanics and the function of the horizontal tailplane, as well as the effect of ice on airfoil (wing or tail) surfaces. A brief video of actual flight footage provided a view of the pilot's actions and reactions and of the horizon during tailplane icing conditions.

  1. Video Podcasts

    DEFF Research Database (Denmark)

    Nortvig, Anne Mette; Sørensen, Birgitte Holm

    2016-01-01

    This project’s aim was to support and facilitate master’s students’ preparation and collaboration by making video podcasts of short lectures available on YouTube prior to students’ first face-to-face seminar. The empirical material stems from group interviews, from statistical data created through...... YouTube analytics and from surveys answered by students after the seminar. The project sought to explore how video podcasts support learning and reflection online and how students use and reflect on the integration of online activities in the videos. Findings showed that students engaged actively...

  2. Digital Video taken during the 3-person submersible Clelia dive 608 of the NOAA Office of Ocean Exploration's Islands in the Stream 2001 cruise, August 30, 2001 (NCEI Accession 0039353)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Islands in the Stream is a three-month scientific expedition to marine protected areas and other habitats being considered for protection from offshore of Belize in...

  3. Digital Video taken during the 3-person submersible Clelia dive 617 of the NOAA Office of Ocean Exploration's Islands in the Stream 2001 cruise, September 03, 2001 (NCEI Accession 0041593)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Islands in the Stream is a three-month scientific expedition to marine protected areas and other habitats being considered for protection from offshore of Belize in...

  4. Digital Video taken during the 3-person submersible Clelia dive 615 of the NOAA Office of Ocean Exploration's Islands in the Stream 2001 cruise, September 02, 2001 (NCEI Accession 0041370)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Islands in the Stream is a three-month scientific expedition to marine protected areas and other habitats being considered for protection from offshore of Belize in...

  5. Digital Video taken during the 3-person submersible Clelia dive 607 of the NOAA Office of Ocean Exploration's Islands in the Stream 2001 cruise, August 29, 2001 (NCEI Accession 0039467)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Islands in the Stream is a three-month scientific expedition to marine protected areas and other habitats being considered for protection from offshore of Belize in...

  6. Video killed the radio stars: Cybersecurity as prerequisite and enabler for Industry 4.0

    CSIR Research Space (South Africa)

    Swanepoel, Aubrey

    2017-01-01

    Full Text Available stream_source_info Swanepoel_CSIR2017.pdf.txt stream_content_type text/plain stream_size 1302 Content-Encoding ISO-8859-1 stream_name Swanepoel_CSIR2017.pdf.txt Content-Type text/plain; charset=ISO-8859-1 Video killed...

  7. Web-based remote video monitoring system implemented using Java technology

    Science.gov (United States)

    Li, Xiaoming

    2012-04-01

    A HTTP based video transmission system has been built upon the p2p(peer to peer) network structure utilizing the Java technologies. This makes the video monitoring available to any host which has been connected to the World Wide Web in any method, including those hosts behind firewalls or in isolated sub-networking. In order to achieve this, a video source peer has been developed, together with the client video playback peer. The video source peer can respond to the video stream request in HTTP protocol. HTTP based pipe communication model is developed to speeding the transmission of video stream data, which has been encoded into fragments using the JPEG codec. To make the system feasible in conveying video streams between arbitrary peers on the web, a HTTP protocol based relay peer is implemented as well. This video monitoring system has been applied in a tele-robotic system as a visual feedback to the operator.

  8. Video surveillance system based on MPEG-4

    Science.gov (United States)

    Ge, Jing; Zhang, Guoping; Yang, Zongkai

    2008-03-01

    Multimedia technology and networks protocol are the basic technology of the video surveillance system. A network remote video surveillance system based on MPEG-4 video coding standards is designed and implemented in this paper. The advantages of the MPEG-4 are analyzed in detail in the surveillance field, and then the real-time protocol and real-time control protocol (RTP/RTCP) are chosen as the networks transmission protocol. The whole system includes video coding control module, playing back module, network transmission module and network receiver module The scheme of management, control and storage about video data are discussed. The DirectShow technology is used to playback video data. The transmission scheme of digital video processing in networks, RTP packaging of MPEG-4 video stream is discussed. The receiver scheme of video date and mechanism of buffer are discussed. The most of the functions are archived by software, except that the video coding control module is achieved by hardware. The experiment results show that it provides good video quality and has the real-time performance. This system can be applied into wide fields.

  9. Video-Multicast in Peer-to-Peer-Netzen

    OpenAIRE

    López Fuentes, Francisco de Asís

    2009-01-01

    Peer-to-peer (P2P) video streaming is a promising solution to enable efficient video distribution over the Internet. The nodes or peers in this type of system can take the role of both a server and of a client at the same time. During video distribution each peer acts as a relay node contributing it upload capacity. This thesis focuses on a specific topic known as P2P Video Multicast within the P2P streaming area. The contribution of this thesis is to present network-adaptive t...

  10. Statistical Analysis of Video Frame Size Distribution Originating from Scalable Video Codec (SVC

    Directory of Open Access Journals (Sweden)

    Sima Ahmadpour

    2017-01-01

    Full Text Available Designing an effective and high performance network requires an accurate characterization and modeling of network traffic. The modeling of video frame sizes is normally applied in simulation studies and mathematical analysis and generating streams for testing and compliance purposes. Besides, video traffic assumed as a major source of multimedia traffic in future heterogeneous network. Therefore, the statistical distribution of video data can be used as the inputs for performance modeling of networks. The finding of this paper comprises the theoretical definition of distribution which seems to be relevant to the video trace in terms of its statistical properties and finds the best distribution using both the graphical method and the hypothesis test. The data set used in this article consists of layered video traces generating from Scalable Video Codec (SVC video compression technique of three different movies.

  11. Brugeroplevelse af streaming-tjenesten Netflix

    OpenAIRE

    Leifer, Anders; Frydendahl, Erik Pouret; Nedergaard, Mads Kresten

    2014-01-01

    This paper aims to describe and understand the use of the video streaming service Netflix among younger single females, with the further aim to understand the success of streaming in general and Netflix’s offer as an experience economy based offering in particular. After introducing Netflix through a review of its history and its competitive environment, and establishing the epistemological and methodological framework, the paper presents its empiric part, a qualitative semi-structured int...

  12. Data Partitioning Technique for Improved Video Prioritization

    Directory of Open Access Journals (Sweden)

    Ismail Amin Ali

    2017-07-01

    Full Text Available A compressed video bitstream can be partitioned according to the coding priority of the data, allowing prioritized wireless communication or selective dropping in a congested channel. Known as data partitioning in the H.264/Advanced Video Coding (AVC codec, this paper introduces a further sub-partition of one of the H.264/AVC codec’s three data-partitions. Results show a 5 dB improvement in Peak Signal-to-Noise Ratio (PSNR through this innovation. In particular, the data partition containing intra-coded residuals is sub-divided into data from: those macroblocks (MBs naturally intra-coded, and those MBs forcibly inserted for non-periodic intra-refresh. Interactive user-to-user video streaming can benefit, as then HTTP adaptive streaming is inappropriate and the High Efficiency Video Coding (HEVC codec is too energy demanding.

  13. ALD: adaptive layer distribution for scalable video

    OpenAIRE

    Quinlan, Jason J.; Zahran, Ahmed H.; Sreenan, Cormac J.

    2013-01-01

    Bandwidth constriction and datagram loss are prominent issues that affect the perceived quality of streaming video over lossy networks, such as wireless. The use of layered video coding seems attractive as a means to alleviate these issues, but its adoption has been held back in large part by the inherent priority assigned to the critical lower layers and the consequences for quality that result from their loss. The proposed use of forward error correction (FEC) as a solution only further bur...

  14. Ensuring security of H.264 videos by using watermarking

    Science.gov (United States)

    Chaumont, Marc

    2011-06-01

    Watermarking is known to be a very difficult task. Robustness, Distortion, Payload, Security, Complexity are many constraints to deal with. When applied to a video stream, the difficulty seems to be growing in comparison to image watermarking. Many classical non malicious manipulations of a compressed stream may suppress the embedded information. For example, a simple re-compression of a DVD movie (MPEG2 compression) to a DivX movie will defeat most of the current state-of-the-art watermarking systems. In this talk, we will expose the different techniques in order to watermark a video compressed stream. Before, we will present the H.264/AVC standard which is one of the most powerful video-compression algorithms. The discussion about video watermarking will be illustrated with H.264 streams. The specific example of traitor tracing will be presented. Deadlocks will be discussed, and then the possible extensions and the future applications will conclude the presentation.

  15. Video enhancement effectiveness for target detection

    Science.gov (United States)

    Simon, Michael; Fischer, Amber; Petrov, Plamen

    2011-05-01

    Unmanned aerial vehicles (UAVs) capture real-time video data of military targets while keeping the warfighter at a safe distance. This keeps soldiers out of harm's way while they perform intelligence, surveillance and reconnaissance (ISR) and close-air support troops in contact (CAS-TIC) situations. The military also wants to use UAV video to achieve force multiplication. One method of achieving effective force multiplication involves fielding numerous UAVs with cameras and having multiple videos processed simultaneously by a single operator. However, monitoring multiple video streams is difficult for operators when the videos are of low quality. To address this challenge, we researched several promising video enhancement algorithms that focus on improving video quality. In this paper, we discuss our video enhancement suite and provide examples of video enhancement capabilities, focusing on stabilization, dehazing, and denoising. We provide results that show the effects of our enhancement algorithms on target detection and tracking algorithms. These results indicate that there is potential to assist the operator in identifying and tracking relevant targets with aided target recognition even on difficult video, increasing the force multiplier effect of UAVs. This work also forms the basis for human factors research into the effects of enhancement algorithms on ISR missions.

  16. Akademisk video

    DEFF Research Database (Denmark)

    Frølunde, Lisbeth

    2017-01-01

    Dette kapitel har fokus på metodiske problemstillinger, der opstår i forhold til at bruge (digital) video i forbindelse med forskningskommunikation, ikke mindst online. Video har længe været benyttet i forskningen til dataindsamling og forskningskommunikation. Med digitaliseringen og internettet er...... der dog opstået nye muligheder og udfordringer i forhold til at formidle og distribuere forskningsresultater til forskellige målgrupper via video. Samtidig er klassiske metodologiske problematikker som forskerens positionering i forhold til det undersøgte stadig aktuelle. Både klassiske og nye...... problemstillinger diskuteres i kapitlet, som rammesætter diskussionen ud fra forskellige positioneringsmuligheder: formidler, historiefortæller, eller dialogist. Disse positioner relaterer sig til genrer inden for ’akademisk video’. Afslutningsvis præsenteres en metodisk værktøjskasse med redskaber til planlægning...

  17. Video Analytics

    DEFF Research Database (Denmark)

    This book collects the papers presented at two workshops during the 23rd International Conference on Pattern Recognition (ICPR): the Third Workshop on Video Analytics for Audience Measurement (VAAM) and the Second International Workshop on Face and Facial Expression Recognition (FFER) from Real...... World Videos. The workshops were run on December 4, 2016, in Cancun in Mexico. The two workshops together received 13 papers. Each paper was then reviewed by at least two expert reviewers in the field. In all, 11 papers were accepted to be presented at the workshops. The topics covered in the papers...

  18. Energy-Reduction Offloading Technique for Streaming Media Servers

    Directory of Open Access Journals (Sweden)

    Yeongpil Cho

    2016-01-01

    Full Text Available Recent growth in popularity of mobile video services raises a demand for one of the most popular and convenient methods of delivering multimedia data, video streaming. However, heterogeneity of currently existing mobile devices involves an issue of separate video transcoding for each type of mobile devices such as smartphones, tablet PCs, and smart TVs. As a result additional burden comes to media servers, which pretranscode multimedia data for number of clients. Regarding even higher increase of video data in the Internet in the future, the problem of media servers overload is impending. To struggle against the problem an offloading method is introduced in this paper. By the use of SorTube offloading framework video transcoding process is shifted from the centralized media server to the local offloading server. Thus, clients can receive personally customized video stream; meanwhile the overload of centralized servers is reduced.

  19. A system for endobronchial video analysis

    Science.gov (United States)

    Byrnes, Patrick D.; Higgins, William E.

    2017-03-01

    Image-guided bronchoscopy is a critical component in the treatment of lung cancer and other pulmonary disorders. During bronchoscopy, a high-resolution endobronchial video stream facilitates guidance through the lungs and allows for visual inspection of a patient's airway mucosal surfaces. Despite the detailed information it contains, little effort has been made to incorporate recorded video into the clinical workflow. Follow-up procedures often required in cancer assessment or asthma treatment could significantly benefit from effectively parsed and summarized video. Tracking diagnostic regions of interest (ROIs) could potentially better equip physicians to detect early airway-wall cancer or improve asthma treatments, such as bronchial thermoplasty. To address this need, we have developed a system for the postoperative analysis of recorded endobronchial video. The system first parses an input video stream into endoscopic shots, derives motion information, and selects salient representative key frames. Next, a semi-automatic method for CT-video registration creates data linkages between a CT-derived airway-tree model and the input video. These data linkages then enable the construction of a CT-video chest model comprised of a bronchoscopy path history (BPH) - defining all airway locations visited during a procedure - and texture-mapping information for rendering registered video frames onto the airwaytree model. A suite of analysis tools is included to visualize and manipulate the extracted data. Video browsing and retrieval is facilitated through a video table of contents (TOC) and a search query interface. The system provides a variety of operational modes and additional functionality, including the ability to define regions of interest. We demonstrate the potential of our system using two human case study examples.

  20. Adult Students' Perceptions in Distance Education Learning Environments Based on a Videoconferencing Platform – QoE Analysis

    Directory of Open Access Journals (Sweden)

    Toni Malinovski

    2015-01-01

    Full Text Available Distance education learning environments provide tremendous convenience and flexibility, allowing busy, mobile adult learners to engage in education while coping with their limited resources in terms of time, energy and finances. Following a student-centered approach this study investigates adult students’ subjective perceptions while using distance education systems based on a videoconferencing platform as Quality of Experience (QoE. Based on a literature review, sociological behavior and expectations, we have constructed a structural equation model (SEM illustrating relations among different variables that can predict positive levels of adult students’ QoE, thus providing guidelines for proper development. We have tested the model using a survey of 198 primary education school teachers involved in a videoconferencing-based learning program for teacher enhancement. Results show a good fit to the model developed. The analysis showed that adult students’ QoE is directly influenced by appropriateness of teacher-student interaction and ease of participation, as well predicted by students’ motivation to attend similar trainings. Additionally, we found that variances in technical quality did not directly influence their QoE from the learning sessions.

  1. Towards User Experience-Driven Adaptive Uplink Video Transmission for Automotive Applications

    OpenAIRE

    Lottermann, Christian

    2016-01-01

    The focus of this thesis is to enable user experience-driven uplink video streaming from mobile video sources with limited computational capacity and to apply these to resource-constraint automotive environments. The first part investigates perceptual quality-aware encoding of videos, the second part proposes camera context-based estimators of temporal and spatial activities for videos captured by a front-facing camera of a vehicle, and the last part studies the upstreaming of videos from a m...

  2. Intelligent Analysis for Georeferenced Video Using Context-Based Random Graphs

    OpenAIRE

    Jiangfan Feng; Hu Song

    2013-01-01

    Video sensor networks are formed by the joining of heterogeneous sensor nodes, which is frequently reported as video of communication functionally bound to geographical locations. Decomposition of georeferenced video stream presents the expression of video from spatial feature set. Although it has been studied extensively, spatial relations underlying the scenario are not well understood, which are important to understand the semantics of georeferenced video and behavior of elements. Here we ...

  3. CovertCast: Using Live Streaming to Evade Internet Censorship

    Directory of Open Access Journals (Sweden)

    McPherson Richard

    2016-07-01

    Full Text Available We design, implement, and evaluate CovertCast, a censorship circumvention system that broadcasts the content of popular websites in real-time, encrypted video streams on common live-streaming services such as YouTube. CovertCast does not require any modifications to the streaming service and employs the same protocols, servers, and streaming software as any other user of the service. Therefore, CovertCast cannot be distinguished from other live streams by IP address filtering or protocol fingerprinting, raising the bar for censors.

  4. SDC: Scalable description coding for adaptive streaming media

    OpenAIRE

    Quinlan, Jason J.; Zahran, Ahmed H.; Sreenan, Cormac J.

    2012-01-01

    Video compression techniques enable adaptive media streaming over heterogeneous links to end-devices. Scalable Video Coding (SVC) and Multiple Description Coding (MDC) represent well-known techniques for video compression with distinct characteristics in terms of bandwidth efficiency and resiliency to packet loss. In this paper, we present Scalable Description Coding (SDC), a technique to compromise the tradeoff between bandwidth efficiency and error resiliency without sacrificing user-percei...

  5. Research of multimedia streaming transmission in multiservice networks

    OpenAIRE

    Romanchuk, Vasyl; Chervenets, Vladymyr; Polishuk, Artur

    2012-01-01

    In order to forecast the quality of media streaming in multiservice networks under conditions of high load of network resources the research of the influence of network circulating traffic on streaming video and the efficiency analysis of existing protocols for transmission of multimedia data is held.

  6. Video Analytics

    DEFF Research Database (Denmark)

    This book collects the papers presented at two workshops during the 23rd International Conference on Pattern Recognition (ICPR): the Third Workshop on Video Analytics for Audience Measurement (VAAM) and the Second International Workshop on Face and Facial Expression Recognition (FFER) from Real W...

  7. Fast Watermarking of MPEG-1/2 Streams Using Compressed-Domain Perceptual Embedding and a Generalized Correlator Detector

    Directory of Open Access Journals (Sweden)

    Briassouli Alexia

    2004-01-01

    Full Text Available A novel technique is proposed for watermarking of MPEG-1 and MPEG-2 compressed video streams. The proposed scheme is applied directly in the domain of MPEG-1 system streams and MPEG-2 program streams (multiplexed streams. Perceptual models are used during the embedding process in order to avoid degradation of the video quality. The watermark is detected without the use of the original video sequence. A modified correlation-based detector is introduced that applies nonlinear preprocessing before correlation. Experimental evaluation demonstrates that the proposed scheme is able to withstand several common attacks. The resulting watermarking system is very fast and therefore suitable for copyright protection of compressed video.

  8. Fast Watermarking of MPEG-1/2 Streams Using Compressed-Domain Perceptual Embedding and a Generalized Correlator Detector

    Science.gov (United States)

    Simitopoulos, Dimitrios; Tsaftaris, Sotirios A.; Boulgouris, Nikolaos V.; Briassouli, Alexia; Strintzis, Michael G.

    2004-12-01

    A novel technique is proposed for watermarking of MPEG-1 and MPEG-2 compressed video streams. The proposed scheme is applied directly in the domain of MPEG-1 system streams and MPEG-2 program streams (multiplexed streams). Perceptual models are used during the embedding process in order to avoid degradation of the video quality. The watermark is detected without the use of the original video sequence. A modified correlation-based detector is introduced that applies nonlinear preprocessing before correlation. Experimental evaluation demonstrates that the proposed scheme is able to withstand several common attacks. The resulting watermarking system is very fast and therefore suitable for copyright protection of compressed video.

  9. Perceptual compressive sensing scalability in mobile video

    Science.gov (United States)

    Bivolarski, Lazar

    2011-09-01

    Scalability features embedded within the video sequences allows for streaming over heterogeneous networks to a variety of end devices. Compressive sensing techniques that will allow for lowering the complexity increase the robustness of the video scalability are reviewed. Human visual system models are often used in establishing perceptual metrics that would evaluate quality of video. Combining of perceptual and compressive sensing approach outlined from recent investigations. The performance and the complexity of different scalability techniques are evaluated. Application of perceptual models to evaluation of the quality of compressive sensing scalability is considered in the near perceptually lossless case and to the appropriate coding schemes is reviewed.

  10. Experience from the 1st Year running a Massive High Quality Videoconferencing Service for the LHC

    Science.gov (United States)

    Fernandes, Joao; Baron, Thomas; Bompastor, Bruno

    2014-06-01

    In the last few years, we have witnessed an explosion of visual collaboration initiatives in the industry. Several advances in video services and also in their underlying infrastructure are currently improving the way people collaborate globally. These advances are creating new usage paradigms: any device in any network can be used to collaborate, in most cases with an overall high quality. To keep apace with this technology progression, the CERN IT Department launched a service based on the Vidyo product. This new service architecture introduces Adaptive Video Layering, which dynamically optimizes the video for each endpoint by leveraging the H.264 Scalable Video Coding (SVC)-based compression technology. It combines intelligent AV routing techniques with the flexibility of H.264 SVC video compression, in order to achieve resilient video collaboration over the Internet, 3G and WiFi. We present an overview of the results that have been achieved after this major change. In particular, the first year of operation of the CERN Vidyo service will be described in terms of performance and scale: The service became part of the daily activity of the LHC collaborations, reaching a monthly usage of more than 3200 meetings with a peak of 750 simultaneous connections. We also present some key features such as the integration with CERN Indico. LHC users can now join a Vidyo meeting either from their personal computer or a CERN videoconference room simply from an Indico event page, with the ease of a single click. The roadmap for future improvements, service extensions and core infrastructure tendencies such as cloud based services and virtualization of system components will also be discussed. Vidyo's strengths allowed us to build a universal service (it is accessible from PCs, but also videoconference rooms, traditional phones, tablets and smartphones), developed with 3 key ideas in mind: ease of use, full integration and high quality.

  11. Scalable video on demand adaptive Internet-based distribution

    CERN Document Server

    Zink, Michael

    2013-01-01

    In recent years, the proliferation of available video content and the popularity of the Internet have encouraged service providers to develop new ways of distributing content to clients. Increasing video scaling ratios and advanced digital signal processing techniques have led to Internet Video-on-Demand applications, but these currently lack efficiency and quality. Scalable Video on Demand: Adaptive Internet-based Distribution examines how current video compression and streaming can be used to deliver high-quality applications over the Internet. In addition to analysing the problems

  12. Quality versus intelligibility: studying human preferences for American Sign Language video

    Science.gov (United States)

    Ciaramello, Frank M.; Hemami, Sheila S.

    2011-03-01

    Real-time videoconferencing using cellular devices provides natural communication to the Deaf community. For this application, compressed American Sign Language (ASL) video must be evaluated in terms of the intelligibility of the conversation and not in terms of the overall aesthetic quality of the video. This work presents a paired comparison experiment to determine the subjective preferences of ASL users in terms of the trade-off between intelligibility and quality when varying the proportion of the bitrate allocated explicitly to the regions of the video containing the signer. A rate-distortion optimization technique, which jointly optimizes a quality criteria and an intelligibility criteria according to a user-specified parameter, generates test video pairs for the subjective experiment. Experimental results suggest that at sufficiently high bitrates, all users prefer videos in which the non-signer regions in the video are encoded with some nominal rate. As the total encoding bitrate decreases, users generally prefer video in which a greater proportion of the rate is allocated to the signer. The specific operating points preferred in the quality-intelligibility trade-off vary with the demographics of the users.

  13. Fair rate allocation of scalable multiple description video for many clients

    NARCIS (Netherlands)

    Taal, R.J.; Lagendijk, R.L.

    2005-01-01

    Peer-to-peer networks (P2P) form a distributed communication infrastructure that is particularly well matched to video streaming using multiple description coding. We form M descriptions using MDC-FEC building on a scalable version of the “Dirac” video coder. The M descriptions are streamed via M

  14. Presence in Video-Mediated Interactions: Case Studies at CSIRO

    Science.gov (United States)

    Alem, Leila

    Although telepresence and a sense of connectedness with others are frequently mentioned in media space studies, as far as we know, none of these studies report attempts at assessing this critical aspect of user experience. While some attempts have been made to measure presence in virtual reality or augmented reality, (a comprehensive review of existing measures is available in Baren and Ijsselsteijn [2004]), very little work has been reported in measuring presence in video-mediated collaboration systems. Traditional studies of video-mediated collaboration have mostly focused their evaluation on measures of task performance and user satisfaction. Videoconferencing systems can be seen as a type of media space; they rely on technologies of audio, video, and computing put together to create an environment extending the embodied mind. This chapter reports on a set of video-mediated collaboration studies conducted at CSIRO in which different aspects of presence are being investigated. The first study reports the sense of physical presence a specialist doctor experiences when engaged in a remote consultation of a patient using the virtual critical care unit (Alem et al., 2006). The Viccu system is an “always-on” system connecting two hospitals (Li et al., 2006). The presence measure focuses on the extent to which users of videoconferencing systems feel physically present in the remote location. The second study reports the sense of social presence users experience when playing a game of charades with remote partners using a video conference link (Kougianous et al., 2006). In this study the presence measure focuses on the extent to which users feel connected with their remote partners. The third study reports the sense of copresence users experience when building collaboratively a piece of Lego toy (Melo and Alem, 2007). The sense of copresence is the extent to which users feel present with their remote partner. In this final study the sense of copresence is

  15. An Algorithm of Extracting I-Frame in Compressed Video

    Directory of Open Access Journals (Sweden)

    Zhu Yaling

    2015-01-01

    Full Text Available The MPEG video data includes three types of frames, that is: I-frame, P-frame and B-frame. However, the I-frame records the main information of video data, the P-frame and the B-frame are just regarded as motion compensations of the I-frame. This paper presents the approach which analyzes the MPEG video stream in the compressed domain, and find out the key frame of MPEG video stream by extracting the I-frame. Experiments indicated that this method can be automatically realized in the compressed MPEG video and it will lay the foundation for the video processing in the future.

  16. Using Videoconferencing to Provide Mentorship in Inquiry-Based Urban and Rural Secondary Classrooms

    Directory of Open Access Journals (Sweden)

    Qing Li

    2010-07-01

    Full Text Available The main purpose of this design-based research study is to examine the effects of an inquiry-based learning environment, with the support of videoconferencing, on both rural and urban secondary students’ mathematics and science learning. An important aspect of this learning environment is the use of videoconferencing to connect classes with mathematicians/ scientists (as e-mentors. Specifically, the following two research questions guide this study: (1 In what ways, if any, does the inquiry-based learning environment impact student beliefs and learning outcomes? (2 What challenges emerge in the development of an inquiry-based learning environment with secondary students in both rural and urban schools? Using a mixed methods approach, this study focuses on two grade 9 classes in an urban school and three Grade 8 classes in a rural school. The results suggest positive effects of this learning environment on student learning of math and science. In particular, both urban and rural students showed significant gains in their achievement. In addition, students showed an increased interest and heightened confidence in math and science. As well, the results point to issues arising from the process, suggesting useful guidelines for the development of such environments. Résumé : L’objectif principal de cette étude de recherche axée sur la conception est d’examiner les effets d’un environnement d’apprentissage basé sur le processus d’enquête et utilisant le soutien de la vidéoconférence sur l’apprentissage des mathématiques et des sciences auprès d’élèves du secondaire en milieux ruraux et urbains. L’utilisation de la vidéoconférence pour mettre les classes en lien avec des mathématiciens et des scientifiques (en tant que cybermentors constitue un aspect important de cet environnement d’apprentissage. Plus précisément, les deux questions suivantes orientent la présente étude : (1 De quelle manière, le cas

  17. Security Issues in Streaming Server for Mobile Devices Development

    OpenAIRE

    Dan Barbu

    2011-01-01

    The paper presents a solution for streaming audio and video content in IP networks using RTP and SIP protocols. Second Section presents multimedia format and compression for the audio content that is streamed by SS4MD. Streaming protocols are shown in third section. In the forth section there is an example of an application which does uses all above. Conclusions are contoured in the final chapter.

  18. Comparison of a Targeted Intervention Program Delivered Face-to-Face and by Personal Videoconferencing for Primary and Middle School Students with Mathematical Learning Difficulties

    Science.gov (United States)

    Kestel, Eugénie

    2014-01-01

    This paper describes part of a mixed-methods study comparing the effectiveness of an individual, conceptual instruction based, tuition program delivered face-to-face and by personal videoconferencing (PVC) for 30 upper primary and middle school students with mathematical learning difficulties (MLDs). The experimental intervention targeted number…

  19. Mediational Effects of Desktop-Videoconferencing Telecollaborative Exchanges on the Intercultural Communicative Competence of Students of French as a Foreign Language

    Science.gov (United States)

    Martin, Veronique

    2013-01-01

    Since the early 2000s, foreign language practitioners and researchers have shown an increasing interest in exploring the affordances of multimodal telecollaborative environments for the linguistic and intercultural development of their students. Due in part to their inherent complexity, one-on-one desktop-videoconferencing contexts have not been…

  20. Satisfaction and Experience with a Supervised Home-Based Real-Time Videoconferencing Telerehabilitation Exercise Program in People with Chronic Obstructive Pulmonary Disease (COPD

    Directory of Open Access Journals (Sweden)

    Ling Ling Y Tsai

    2016-12-01

    Full Text Available Telerehabilitation, consisting of supervised home-based exercise training via real-time videoconferencing, is an alternative method to deliver pulmonary rehabilitation with potential to improve access. The aims were to determine the level of satisfaction and experience of an eight-week supervised home-based telerehabilitation exercise program using real-time videoconferencing in people with COPD. Quantitative measures were the Client Satisfaction Questionnaire-8 (CSQ-8 and a purpose-designed satisfaction survey. A qualitative component was conducted using semi-structured interviews. Nineteen participants (mean (SD age 73 (8 years, forced expiratory volume in 1 second (FEV1 60 (23 % predicted showed a high level of satisfaction in the CSQ-8 score and 100% of participants reported a high level of satisfaction with the quality of exercise sessions delivered using real-time videoconferencing in participant satisfaction survey. Eleven participants undertook semi-structured interviews. Key themes in four areas relating to the telerehabilitation service emerged: positive virtual interaction through technology; health benefits; and satisfaction with the convenience and use of equipment. Participants were highly satisfied with the telerehabilitation exercise program delivered via videoconferencing.

  1. Arrest of cytoplasmic streaming induces algal proliferation in green paramecia.

    Directory of Open Access Journals (Sweden)

    Toshiyuki Takahashi

    Full Text Available A green ciliate Paramecium bursaria, bearing several hundreds of endosymbiotic algae, demonstrates rotational microtubule-based cytoplasmic streaming, in which cytoplasmic granules and endosymbiotic algae flow in a constant direction. However, its physiological significance is still unknown. We investigated physiological roles of cytoplasmic streaming in P. bursaria through host cell cycle using video-microscopy. Here, we found that cytoplasmic streaming was arrested in dividing green paramecia and the endosymbiotic algae proliferated only during the arrest of cytoplasmic streaming. Interestingly, arrest of cytoplasmic streaming with pressure or a microtubule drug also induced proliferation of endosymbiotic algae independently of host cell cycle. Thus, cytoplasmic streaming may control the algal proliferation in P. bursaria. Furthermore, confocal microscopic observation revealed that a division septum was formed in the constricted area of a dividing paramecium, producing arrest of cytoplasmic streaming. This is a first report to suggest that cytoplasmic streaming controls proliferation of eukaryotic cells.

  2. Privacy-protecting video surveillance

    Science.gov (United States)

    Wickramasuriya, Jehan; Alhazzazi, Mohanned; Datt, Mahesh; Mehrotra, Sharad; Venkatasubramanian, Nalini

    2005-02-01

    Forms of surveillance are very quickly becoming an integral part of crime control policy, crisis management, social control theory and community consciousness. In turn, it has been used as a simple and effective solution to many of these problems. However, privacy-related concerns have been expressed over the development and deployment of this technology. Used properly, video cameras help expose wrongdoing but typically come at the cost of privacy to those not involved in any maleficent activity. This work describes the design and implementation of a real-time, privacy-protecting video surveillance infrastructure that fuses additional sensor information (e.g. Radio-frequency Identification) with video streams and an access control framework in order to make decisions about how and when to display the individuals under surveillance. This video surveillance system is a particular instance of a more general paradigm of privacy-protecting data collection. In this paper we describe in detail the video processing techniques used in order to achieve real-time tracking of users in pervasive spaces while utilizing the additional sensor data provided by various instrumented sensors. In particular, we discuss background modeling techniques, object tracking and implementation techniques that pertain to the overall development of this system.

  3. Issues in Satellite Packet Video Communication.

    Science.gov (United States)

    1983-07-01

    i.o . .. . . _ _: .. ,: -t - .. . ..:’, • ... . . . ... . . . j.. - . ". 4 ISSUES IN SATELLITE PACKET VIDEO COMMUNICATIO \\ For the transmitter: 1. Get...No. 4469. Ma. 1981. 4. Forgie. James W., ST- A Proposed Internet Stream Protocol, M.I.T. Lincoln Laboratory, IEN 119, September 1979. 5. Jam. A. K

  4. Automatic topics segmentation for TV news video

    Science.gov (United States)

    Hmayda, Mounira; Ejbali, Ridha; Zaied, Mourad

    2017-03-01

    Automatic identification of television programs in the TV stream is an important task for operating archives. This article proposes a new spatio-temporal approach to identify the programs in TV stream into two main steps: First, a reference catalogue for video features visual jingles built. We operate the features that characterize the instances of the same program type to identify the different types of programs in the flow of television. The role of video features is to represent the visual invariants for each visual jingle using appropriate automatic descriptors for each television program. On the other hand, programs in television streams are identified by examining the similarity of the video signal for visual grammars in the catalogue. The main idea of the identification process is to compare the visual similarity of the video signal features in the flow of television to the catalogue. After presenting the proposed approach, the paper overviews encouraging experimental results on several streams extracted from different channels and compounds of several programs.

  5. Video Broadcasting Using Queue Proportional Scheduling

    Directory of Open Access Journals (Sweden)

    Dimitris Toumpakaris

    2007-01-01

    using a Markov Chain approach leading to a method for approximating the packet delay distribution. Based on the resulting distribution, it is discussed how the video encoding rate can be chosen in order to reduce the expected distortion of streams transmitted through Broadcast Channels.

  6. Video Analytics

    DEFF Research Database (Denmark)

    This book collects the papers presented at two workshops during the 23rd International Conference on Pattern Recognition (ICPR): the Third Workshop on Video Analytics for Audience Measurement (VAAM) and the Second International Workshop on Face and Facial Expression Recognition (FFER) from Real...... include: re-identification, consumer behavior analysis, utilizing pupillary response for task difficulty measurement, logo detection, saliency prediction, classification of facial expressions, face recognition, face verification, age estimation, super-resolution, pose estimation, and pain recognition...

  7. Video Analytics

    DEFF Research Database (Denmark)

    include: re-identification, consumer behavior analysis, utilizing pupillary response for task difficulty measurement, logo detection, saliency prediction, classification of facial expressions, face recognition, face verification, age estimation, super-resolution, pose estimation, and pain recognition......This book collects the papers presented at two workshops during the 23rd International Conference on Pattern Recognition (ICPR): the Third Workshop on Video Analytics for Audience Measurement (VAAM) and the Second International Workshop on Face and Facial Expression Recognition (FFER) from Real...

  8. Bandwidth allocation for video under quality of service constraints

    CERN Document Server

    Anjum, Bushra

    2014-01-01

    We present queueing-based algorithms to calculate the bandwidth required for a video stream so that the three main Quality of Service constraints, i.e., end-to-end delay, jitter and packet loss, are ensured. Conversational and streaming video-based applications are becoming a major part of the everyday Internet usage. The quality of these applications (QoS), as experienced by the user, depends on three main metrics of the underlying network, namely, end-to-end delay, jitter and packet loss. These metrics are, in turn, directly related to the capacity of the links that the video traffic trave

  9. Temporal scalability comparison of the H.264/SVC and distributed video codec

    DEFF Research Database (Denmark)

    Huang, Xin; Ukhanova, Ann; Belyaev, Evgeny

    2009-01-01

    The problem of the multimedia scalable video streaming is a current topic of interest. There exist many methods for scalable video coding. This paper is focused on the scalable extension of H.264/AVC (H.264/SVC) and distributed video coding (DVC). The paper presents an efficiency comparison of SVC...

  10. Video Analysis in Multi-Intelligence

    Energy Technology Data Exchange (ETDEWEB)

    Key, Everett Kiusan [Univ. of Washington, Seattle, WA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Van Buren, Kendra Lu [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Warren, Will [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Hemez, Francois M. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-07-27

    This is a project which was performed by a graduated high school student at Los Alamos National Laboratory (LANL). The goal of the Multi-intelligence (MINT) project is to determine the state of a facility from multiple data streams. The data streams are indirect observations. The researcher is using DARHT (Dual-Axis Radiographic Hydrodynamic Test Facility) as a proof of concept. In summary, videos from the DARHT facility contain a rich amount of information. Distribution of car activity can inform us about the state of the facility. Counting large vehicles shows promise as another feature for identifying the state of operations. Signal processing techniques are limited by the low resolution and compression of the videos. We are working on integrating these features with features obtained from other data streams to contribute to the MINT project. Future work can pursue other observations, such as when the gate is functioning or non-functioning.

  11. An improvement analysis on video compression using file segmentation

    Science.gov (United States)

    Sharma, Shubhankar; Singh, K. John; Priya, M.

    2017-11-01

    From the past two decades the extreme evolution of the Internet has lead a massive rise in video technology and significantly video consumption over the Internet which inhabits the bulk of data traffic in general. Clearly, video consumes that so much data size on the World Wide Web, to reduce the burden on the Internet and deduction of bandwidth consume by video so that the user can easily access the video data.For this, many video codecs are developed such as HEVC/H.265 and V9. Although after seeing codec like this one gets a dilemma of which would be improved technology in the manner of rate distortion and the coding standard.This paper gives a solution about the difficulty for getting low delay in video compression and video application e.g. ad-hoc video conferencing/streaming or observation by surveillance. Also this paper describes the benchmark of HEVC and V9 technique of video compression on subjective oral estimations of High Definition video content, playback on web browsers. Moreover, this gives the experimental ideology of dividing the video file into several segments for compression and putting back together to improve the efficiency of video compression on the web as well as on the offline mode.

  12. A multipath video delivery scheme over diffserv wireless LANs

    Science.gov (United States)

    Man, Hong; Li, Yang

    2004-01-01

    This paper presents a joint source coding and networking scheme for video delivery over ad hoc wireless local area networks. The objective is to improve the end-to-end video quality with the constraint of the physical network. The proposed video transport scheme effectively integrates several networking components including load-aware multipath routing, class based queuing (CBQ), and scalable (or layered) video source coding techniques. A typical progressive video coder, 3D-SPIHT, is used to generate multi-layer source data streams. The coded bitstreams are then segmented into multiple sub-streams, each with a different level of importance towards the final video reconstruction. The underlay wireless ad hoc network is designed to support service differentiation. A contention sensitive load aware routing (CSLAR) protocol is proposed. The approach is to discover multiple routes between the source and the destination, and label each route with a load value which indicates its quality of service (QoS) characteristics. The video sub-streams will be distributed among these paths according to their QoS priority. CBQ is also applied to all intermediate nodes, which gives preference to important sub-streams. Through this approach, the scalable source coding techniques are incorporated with differentiated service (DiffServ) networking techniques so that the overall system performance is effectively improved. Simulations have been conducted on the network simulator (ns-2). Both network layer performance and application layer performance are evaluated. Significant improvements over traditional ad hoc wireless network transport schemes have been observed.

  13. MPEG2 video parameter and no reference PSNR estimation

    DEFF Research Database (Denmark)

    Li, Huiying; Forchhammer, Søren

    2009-01-01

    MPEG coded video may be processed for quality assessment or postprocessed to reduce coding artifacts or transcoded. Utilizing information about the MPEG stream may be useful for these tasks. This paper deals with estimating MPEG parameter information from the decoded video stream without access...... to the MPEG stream. This may be used in systems and applications where the coded stream is not accessible. Detection of MPEG I-frames and DCT (discrete cosine transform) block size is presented. For the I-frames, the quantization parameters are estimated. Combining these with statistics of the reconstructed...... DCT coefficients, the PSNR is estimated from the decoded video without reference images. Tests on decoded fixed rate MPEG2 sequences demonstrate perfect detection rates and good performance of the PSNR estimation....

  14. Delivering stable high-quality video: an SDN architecture with DASH assisting network elements

    NARCIS (Netherlands)

    J.W.M. Kleinrouweler (Jan Willem); S. Cabrero Barros (Sergio); P.S. Cesar Garcia (Pablo Santiago)

    2016-01-01

    textabstractDynamic adaptive streaming over HTTP (DASH) is a simple, but effective, technology for video streaming over the Internet. It provides adaptive streaming while being highly scalable at the side of the content providers. However, the mismatch between TCP and the adaptive bursty nature of

  15. La distance en formation aux langues par visioconférence : dimensions, mesures, conséquences Distance in Language Training via Videoconferencing: Dimensions, Evaluation, and Consequences

    Directory of Open Access Journals (Sweden)

    Elke Nissen

    2003-12-01

    Full Text Available Nous comparons deux situations de formation en anglais, l'une présentielle et l'autre par visioconférence, à l'aide d'une série d'indicateurs tirés de la littérature mais rarement réunis dans une seule et même étude. Sur un corpus de 18 enregistrements vidéoscopiques de séquences de formation individuelles (9 en situation présentielle vs 9 en visioconférence, nous avons analysé la nature des échanges verbaux, mais aussi relevé et dénombré de nombreux indices gestuels, tantôt caractéristiques de l'implication du sujet dans la relation pédagogique, tantôt révélateurs de son habileté à manipuler le dispositif technique, le tout doublé d'un questionnaire adressé à l'apprenant. Si certaines différences significatives sont conformes à d'autres travaux du même type, il apparaît que des variables pourtant connues comme discriminatrices de ces deux situations ne le sont pas ou révèlent des tendances inverses à celles attendues. Plus largement, la nature des contrastes que nous avons observés renvoie à la manière d'appréhender la mesure de la distance et à la connaissance que nous avons de son influence sur l'apprentissage d'une langue vivante étrangère. Nous proposons alors de considérer la distance davantage comme un paramètre contextuel plutôt que comme une caractéristique déterminée par la situation.This study compares two types of English lessons, one face-to-face and the other via videoconferencing. The different indicators used come from the literature in the field, but have rarely been gathered in one single study. Based on these indicators, 18 video recordings of individual training sessions (9 face to face vs. 9 via video conferencing were analysed. The onus was put on the analysis of verbal interaction as well as the number of gestures, some of them revealing the implication of the learner in the pedagogical relationship, others revealing the learner's technical awareness. In addition, the

  16. Hybrid Peer-to-peer Streaming System for Mobile Peers with Transcoding

    Directory of Open Access Journals (Sweden)

    Shuai Zeng

    2015-08-01

    Full Text Available In this paper, we study in hybrid peer-to-peer (P2P streaming system, which includes fixed peers and mobile peers in the same network, and propose a flow rate allocation algorithm to optimize the streaming system. In the proposed algorithm, based on transcoding technique, we describe how to exchange original and transcoded data among video source server, fixed and mobile peers. The purpose of our algorithm is to reduce the bandwidth demand of video source server, while ensuring the flow rate of video data sending to any peer no less than its video coding rate. We compare the performance of P2P streaming system using our algorithm with traditional design in various situations in the simulation experiment, and test how much benefit the system can get from the new algorithm. The results show that, if the flow rate of video data is allocated appropriately, better performance of streaming system can be achieved.

  17. Combined Scalable Video Coding Method for Wireless Transmission

    Directory of Open Access Journals (Sweden)

    Achmad Affandi

    2011-08-01

    Full Text Available Mobile video streaming is one of multimedia services that has developed very rapidly. Recently, bandwidth utilization for wireless transmission is the main problem in the field of multimedia communications. In this research, we offer a combination of scalable methods as the most attractive solution to this problem. Scalable method for wireless communication should adapt to input video sequence. Standard ITU (International Telecommunication Union - Joint Scalable Video Model (JSVM is employed to produce combined scalable video coding (CSVC method that match the required quality of video streaming services for wireless transmission. The investigation in this paper shows that combined scalable technique outperforms the non-scalable one, in using bit rate capacity at certain layer.

  18. Sending Safety Video over WiMAX in Vehicle Communications

    Directory of Open Access Journals (Sweden)

    Jun Steed Huang

    2013-10-01

    Full Text Available This paper reports on the design of an OPNET simulation platform to test the performance of sending real-time safety video over VANET (Vehicular Adhoc NETwork using the WiMAX technology. To provide a more realistic environment for streaming real-time video, a video model was created based on the study of video traffic traces captured from a realistic vehicular camera, and different design considerations were taken into account. A practical controller over real-time streaming protocol is implemented to control data traffic congestion for future road safety development. Our driving video model was then integrated with the WiMAX OPNET model along with a mobility model based on real road maps. Using this simulation platform, different mobility cases have been studied and the performance evaluated in terms of end-to-end delay, jitter and visual experience.

  19. Error resilience technique for video coding using concealment

    Science.gov (United States)

    Li, Rong; Yu, Sheng-sheng; Zhu, Li

    2009-10-01

    The traditional error resilience technique has been widely used in video coding. Many literatures have shown that with the technique's help, the video coding bit stream can been protected and the reconstructed image will get high improvement. In this paper, we review the error resilience for video coding and give the experiment of this new technology. These techniques are based on coding simultaneously for synchronization and error protection or detection. We apply the techniques to improve the performance of the multiplexing protocol and also to improve the robustness of the coded video. The techniques proposed for the video also have the advantage of simple trans-coding with bit streams complying in H.263.

  20. Video surveillance using JPEG 2000

    Science.gov (United States)

    Dufaux, Frederic; Ebrahimi, Touradj

    2004-11-01

    This paper describes a video surveillance system which is composed of three key components, smart cameras, a server, and clients, connected through IP-networks in wired or wireless configurations. The system has been designed so as to protect the privacy of people under surveillance. Smart cameras are based on JPEG 2000 compression where an analysis module allows for events detection and regions of interest identification. The resulting regions of interest can then be encoded with better quality and scrambled. Compressed video streams are scrambled and signed for the purpose of privacy and data integrity verification using JPSEC compliant methods. The same bitstream may also be protected for robustness to transmission errors based on JPWL compliant methods. The server receives, stores, manages and transmits the video sequences on wired and wireless channels to a variety of clients and users with different device capabilities, channel characteristics and preferences. Use of seamless scalable coding of video sequences prevents any need for transcoding operations at any point in the system.

  1. Implementation of multistandard video signals integrator

    Science.gov (United States)

    Zabołotny, Wojciech M.; Pastuszak, Grzegorz; Sokół, Grzegorz; Borowik, Grzegorz; GÄ ska, Michał; Kasprowicz, Grzegorz H.; Poźniak, Krzysztof T.; Abramowski, Andrzej; Buchowicz, Andrzej; Trochimiuk, Maciej; Frasunek, Przemysław; Jurkiewicz, Rafał; Nalbach-Moszynska, Małgorzata; Wawrzusiak, Radosław; Bukowiecka, Danuta; Tyburska, Agata; Struniawski, Jarosław; Jastrzebski, Paweł; Jewartowski, BłaŻej; Brawata, Sebastian; Bubak, Iwona; Gloza, Małgorzata

    2017-08-01

    The paper describes the prototype implemetantion of the Video Signals Integrator (VSI). The function of the system is to integrate video signals from many sources. The VSI is a complex hybrid system consisting of hardware, firmware and software components. Its creation requires joint effort of experts from different areas. The VSI capture device is a portable hardware device responsible for capturing of video signals from different different sources and in various formats, and for transmitting them to the server. The NVR server aggregates video and control streams coming from different sources and multiplexes them into logical channels with each channel representing a single source. From there each channel can be distributed further to the end clients (consoles) for live display via a number of RTSP servers. The end client can, at the same time, inject control messages into a given channel to control movement of a CCTV camera.

  2. Restoration of Lowland Streams

    DEFF Research Database (Denmark)

    Osborne, L. L.; Bayley, P. B.; Higler, L. W. G.

    1993-01-01

    Sammenskrivning af resultater fra symposium: Lowland Streams Restoration Workshop, Lund, Sweden, August 1991......Sammenskrivning af resultater fra symposium: Lowland Streams Restoration Workshop, Lund, Sweden, August 1991...

  3. A novel 3D scalable video compression algorithm

    Science.gov (United States)

    Somasundaram, Siva; Subbalakshmi, Koduvayur P.

    2003-05-01

    In this paper we propose a scalable video coding scheme that utilizes the embedded block coding with optimal truncation (EBCOT) compression algorithm. Three dimensional spatio-temporal decomposition of the video sequence succeeded by compression using the EBCOT generates a SNR and resolution scalable bit stream. The proposed video coding algorithm not only performs closer to the MPEG-4 video coding standard in compression efficiency but also provides better SNR and resolution scalability. Experimental results show that the performance of the proposed algorithm does better than the 3-D SPIHT (Set Partitioning in Hierarchial Trees) algorithm by 1.5dB.

  4. Video summarisation: A conceptual framework and survey of the state of the art

    OpenAIRE

    Money, AG; Agius, H.

    2008-01-01

    This is the post-print (final draft post-refereeing) version of the article. Copyright @ 2007 Elsevier Inc. Video summaries provide condensed and succinct representations of the content of a video stream through a combination of still images, video segments, graphical representations and textual descriptors. This paper presents a conceptual framework for video summarisation derived from the research literature and used as a means for surveying the research literature. The framework distin...

  5. Rate-adaptive compressive video acquisition with sliding-window total-variation-minimization reconstruction

    Science.gov (United States)

    Liu, Ying; Pados, Dimitris A.

    2013-05-01

    We consider a compressive video acquisition system where frame blocks are sensed independently. Varying block sparsity is exploited in the form of individual per-block open-loop sampling rate allocation with minimal system overhead. At the decoder, video frames are reconstructed via sliding-window inter-frame total variation minimization. Experimental results demonstrate that such rate-adaptive compressive video acquisition improves noticeably the rate-distortion performance of the video stream over fixed-rate acquisition approaches.

  6. H.264 QoS and Application Performance with Different Streaming Protocols

    OpenAIRE

    Laine, Sanna; Hakala, Ismo

    2015-01-01

    Streaming techniques, including the selected streaming protocol, have an effect on the streaming quality. In this study, the performance of three different streaming protocols in a disturbed communication channel is evaluated with a modified version of the FFPlay player. A H.264 encoded video is used as a test sequence. The number of displayed image frames, the frame rate and playout duration are used as objective metrics for QoS. The metrics brings out differences of str...

  7. NEI You Tube Videos: Amblyopia

    Medline Plus

    Full Text Available ... NEI YouTube Videos > NEI YouTube Videos: Amblyopia NEI YouTube Videos YouTube Videos Home Age-Related Macular Degeneration ... Retinopathy of Prematurity Science Spanish Videos Webinars NEI YouTube Videos: Amblyopia Embedded video for NEI YouTube Videos: ...

  8. NEI You Tube Videos: Amblyopia

    Medline Plus

    Full Text Available ... YouTube Videos > NEI YouTube Videos: Amblyopia NEI YouTube Videos YouTube Videos Home Age-Related Macular Degeneration Amblyopia ... of Prematurity Science Spanish Videos Webinars NEI YouTube Videos: Amblyopia Embedded video for NEI YouTube Videos: Amblyopia ...

  9. NEI You Tube Videos: Amblyopia

    Science.gov (United States)

    ... YouTube Videos > NEI YouTube Videos: Amblyopia NEI YouTube Videos YouTube Videos Home Age-Related Macular Degeneration Amblyopia ... of Prematurity Science Spanish Videos Webinars NEI YouTube Videos: Amblyopia Embedded video for NEI YouTube Videos: Amblyopia ...

  10. SST: Single-Stream Temporal Action Proposals

    KAUST Repository

    Buch, Shyamal

    2017-11-09

    Our paper presents a new approach for temporal detection of human actions in long, untrimmed video sequences. We introduce Single-Stream Temporal Action Proposals (SST), a new effective and efficient deep architecture for the generation of temporal action proposals. Our network can run continuously in a single stream over very long input video sequences, without the need to divide input into short overlapping clips or temporal windows for batch processing. We demonstrate empirically that our model outperforms the state-of-the-art on the task of temporal action proposal generation, while achieving some of the fastest processing speeds in the literature. Finally, we demonstrate that using SST proposals in conjunction with existing action classifiers results in improved state-of-the-art temporal action detection performance.

  11. Video signals integrator (VSI) system architecture

    Science.gov (United States)

    Kasprowicz, Grzegorz; Pastuszak, Grzegorz; Poźniak, Krzysztof; Trochimiuk, Maciej; Abramowski, Andrzej; Gaska, Michal; Bukowiecka, Danuta; Tyburska, Agata; Struniawski, Jarosław; Jastrzebski, Pawel; Jewartowski, Blazej; Frasunek, Przemysław; Nalbach-Moszynska, Małgorzata; Brawata, Sebastian; Bubak, Iwona; Gloza, Małgorzata

    2016-09-01

    The purpose of the project is development of a platform which integrates video signals from many sources. The signals can be sourced by existing analogue CCTV surveillance installations, recent internet-protocol (IP) cameras or single cameras of any type. The system will consist of portable devices that provide conversion, encoding, transmission and archiving. The sharing subsystem will use distributed file system and also user console which provides simultaneous access to any of video streams in real time. The system is fully modular so its extension is possible, both from hardware and software side. Due to standard modular technology used, partial technology modernization is also possible during a long exploitation period.

  12. Seminar 2.0: Learning With Skype and Video Podcasts

    Science.gov (United States)

    Wessel, Paul; Anderson, Tiffany; Austin, Regan; Benediktsdottir, Asdis; Chandler, Michael T.; Conley, Michaela M.; Kim, Seung-Sep; Michaud, Robert L.; Rumpf, M. Elise; Sleeper, Jonathan D.; Weiss, Jonathan R.

    2009-04-01

    Graduate seminars typically involve reviewing key papers, ranging from seminal contributions by pioneers to the latest cutting-edge results published in journals such as Nature, Science, and Geophysical Research Letters. Ideally, guest lecturers are invited to add specific expertise and stimulate discussions. However, the increasing costs for travel make this an expensive proposition. Recent improvements in free videoconferencing over the Internet make it possible to invite distant experts to participate in seminars without involving expensive and time-consuming travel. Tools to record video conferences allow anyone to combine narrations with slide presentations and prepare merged video files for distribution over the Internet (i.e., podcasts). This brief report discusses such an experiment in a graduate seminar on advanced plate tectonics in the Department of Geology and Geophysics at University of Hawai`i at Manoa's (UHM) School of Ocean and Earth Science and Technology (SOEST). The podcasts are freely available from iTunes (UHM; SOEST; Public Course Lectures) and from http://www.soest.hawaii.edu/pwessel/podcasts.

  13. Rheumatoid Arthritis Educational Video Series

    Medline Plus

    Full Text Available ... Rheumatoid Arthritis Educational Video Series Rheumatoid Arthritis Educational Video Series This series of five videos was designed ... Activity Role of Body Weight in Osteoarthritis Educational Videos for Patients Rheumatoid Arthritis Educational Video Series Psoriatic ...

  14. 61214++++','DOAJ-ART-EN'); return false;" href="+++++https://jual.nipissingu.ca/wp-content/uploads/sites/25/2014/06/v61214.m4v">61214++++">Jailed - Video

    Directory of Open Access Journals (Sweden)

    Cameron CULBERT

    2012-07-01

    Full Text Available As the public education system in Northern Ontario continues to take a downward spiral, a plethora of secondary school students are being placed in an alternative educational environment. Juxtaposing the two educational settings reveals very similar methods and characteristics of educating our youth as opposed to using a truly alternative approach to education. This video reviews the relationship between public education and alternative education in a remote Northern Ontario setting. It is my belief that the traditional methods of teaching are not appropriate in educating at risk students in alternative schools. Paper and pencil worksheets do not motivate these students to learn and succeed. Alternative education should emphasize experiential learning, a just in time curriculum based on every unique individual and the students true passion for everyday life. Cameron Culbert was born on February 3rd, 1977 in North Bay, Ontario. His teenage years were split between attending public school and his willed curriculum on the ski hill. Culbert spent 10 years (1996-2002 & 2006-2010 competing for Canada as an alpine ski racer. His passion for teaching and coaching began as an athlete and has now transferred into the classroom and the community. As a graduate of Nipissing University (BA, BEd, MEd. Camerons research interests are alternative education, physical education and technology in the classroom. Currently Cameron is an active educator and coach in Northern Ontario.

  15. Video Design Games

    DEFF Research Database (Denmark)

    Smith, Rachel Charlotte; Christensen, Kasper Skov; Iversen, Ole Sejer

    We introduce Video Design Games to train educators in teaching design. The Video Design Game is a workshop format consisting of three rounds in which participants observe, reflect and generalize based on video snippets from their own practice. The paper reports on a Video Design Game workshop...

  16. MR360: Mixed Reality Rendering for 360° Panoramic Videos.

    Science.gov (United States)

    Rhee, Taehyun; Petikam, Lohit; Allen, Benjamin; Chalmers, Andrew

    2017-04-01

    This paper presents a novel immersive system called MR360 that provides interactive mixed reality (MR) experiences using a conventional low dynamic range (LDR) 360° panoramic video (360-video) shown in head mounted displays (HMDs). MR360 seamlessly composites 3D virtual objects into a live 360-video using the input panoramic video as the lighting source to illuminate the virtual objects. Image based lighting (IBL) is perceptually optimized to provide fast and believable results using the LDR 360-video as the lighting source. Regions of most salient lights in the input panoramic video are detected to optimize the number of lights used to cast perceptible shadows. Then, the areas of the detected lights adjust the penumbra of the shadow to provide realistic soft shadows. Finally, our real-time differential rendering synthesizes illumination of the virtual 3D objects into the 360-video. MR360 provides the illusion of interacting with objects in a video, which are actually 3D virtual objects seamlessly composited into the background of the 360-video. MR360 was implemented in a commercial game engine and tested using various 360-videos. Since our MR360 pipeline does not require any pre-computation, it can synthesize an interactive MR scene using a live 360-video stream while providing realistic high performance rendering suitable for HMDs.

  17. Characterization of social video

    Science.gov (United States)

    Ostrowski, Jeffrey R.; Sarhan, Nabil J.

    2009-01-01

    The popularity of social media has grown dramatically over the World Wide Web. In this paper, we analyze the video popularity distribution of well-known social video websites (YouTube, Google Video, and the AOL Truveo Video Search engine) and characterize their workload. We identify trends in the categories, lengths, and formats of those videos, as well as characterize the evolution of those videos over time. We further provide an extensive analysis and comparison of video content amongst the main regions of the world.

  18. Perceived Quality of Full HD Video - Subjective Quality Assessment

    Directory of Open Access Journals (Sweden)

    Juraj Bienik

    2016-01-01

    Full Text Available In recent years, an interest in multimedia services has become a global trend and this trend is still rising. The video quality is a very significant part from the bundle of multimedia services, which leads to a requirement for quality assessment in the video domain. Video quality of a streamed video across IP networks is generally influenced by two factors “transmission link imperfection and efficiency of compression standards. This paper deals with subjective video quality assessment and the impact of the compression standards H.264, H.265 and VP9 on perceived video quality of these compression standards. The evaluation is done for four full HD sequences, the difference of scenes is in the content“ distinction is based on Spatial (SI and Temporal (TI Index of test sequences. Finally, experimental results follow up to 30% bitrate reducing of H.265 and VP9 compared with the reference H.264.

  19. Video over DSL with LDGM Codes for Interactive Applications

    Directory of Open Access Journals (Sweden)

    Laith Al-Jobouri

    2016-05-01

    Full Text Available Digital Subscriber Line (DSL network access is subject to error bursts, which, for interactive video, can introduce unacceptable latencies if video packets need to be re-sent. If the video packets are protected against errors with Forward Error Correction (FEC, calculation of the application-layer channel codes themselves may also introduce additional latency. This paper proposes Low-Density Generator Matrix (LDGM codes rather than other popular codes because they are more suitable for interactive video streaming, not only for their computational simplicity but also for their licensing advantage. The paper demonstrates that a reduction of up to 4 dB in video distortion is achievable with LDGM Application Layer (AL FEC. In addition, an extension to the LDGM scheme is demonstrated, which works by rearranging the columns of the parity check matrix so as to make it even more resilient to burst errors. Telemedicine and video conferencing are typical target applications.

  20. No-Reference Video Quality Assessment using Codec Analysis

    DEFF Research Database (Denmark)

    Søgaard, Jacob; Forchhammer, Søren; Korhonen, Jari

    2015-01-01

    A no-reference video quality assessment (VQA) method is presented for videos distorted by H.264/AVC and MPEG-2. The assessment is performed without access to the bit-stream. Instead we analyze and estimate coefficients based on decoded pixels. The approach involves distinguishing between the two...... types of videos, estimating the level of quantization used in the I-frames, and exploiting this information to assess the video quality. In order to do this for H.264/AVC, the distribution of the DCT-coefficients after intra-prediction and deblocking are modeled. To obtain VQA features for H.264/AVC, we...... propose a novel estimation method of the quantization in H.264/AVC videos without bitstream access, which can also be used for Peak Signalto-Noise Ratio (PSNR) estimation. The results from the MPEG-2 and H.264/AVC analysis are mapped to a perceptual measure of video quality by Support Vector Regression...

  1. Give-to-Get : Free-riding-resilient Video-on-Demand in P2P Systems

    NARCIS (Netherlands)

    Mol, J.J.D.; Pouwelse, J.A.; Meulpolder, M.; Epema, D.H.J.; Sips, H.J.

    2008-01-01

    Centralised solutions for Video-on-Demand (VoD) services, which stream pre-recorded video content to multiple clients who start watching at the moments of their own choosing, are not scalable because of the high bandwidth requirements of the central video servers. Peer-to-peer (P2P) techniques which

  2. Video visual analytics

    OpenAIRE

    Höferlin, Markus Johannes

    2013-01-01

    The amount of video data recorded world-wide is tremendously growing and has already reached hardly manageable dimensions. It originates from a wide range of application areas, such as surveillance, sports analysis, scientific video analysis, surgery documentation, and entertainment, and its analysis represents one of the challenges in computer science. The vast amount of video data renders manual analysis by watching the video data impractical. However, automatic evaluation of video material...

  3. Information Behavior on Social Live Streaming Services

    Directory of Open Access Journals (Sweden)

    Scheibe, Katrin

    2016-06-01

    Full Text Available In the last few years, a new type of synchronous social networking services (SNSs has emerged—social live streaming services (SLSSs. Studying SLSSs is a new and exciting research field in information science. What information behaviors do users of live streaming platforms exhibit? In our empirical study we analyzed information production behavior (i.e., broadcasting as well as information reception behavior (watching streams and commenting on them. We conducted two quantitative investigations, namely an online survey with YouNow users (N = 123 and observations of live streams on YouNow (N = 434. YouNow is a service with video streams mostly made by adolescents for adolescents. YouNow users like to watch streams, to chat while watching, and to reward performers by using emoticons. While broadcasting, there is no anonymity (as in nearly all other WWW services. Synchronous SNSs remind us of the film The Truman Show, as anyone has the chance to consciously broadcast his or her own life real-time.

  4. A new display stream compression standard under development in VESA

    Science.gov (United States)

    Jacobson, Natan; Thirumalai, Vijayaraghavan; Joshi, Rajan; Goel, James

    2017-09-01

    The Advanced Display Stream Compression (ADSC) codec project is in development in response to a call for technologies from the Video Electronics Standards Association (VESA). This codec targets visually lossless compression of display streams at a high compression rate (typically 6 bits/pixel) for mobile/VR/HDR applications. Functionality of the ADSC codec is described in this paper, and subjective trials results are provided using the ISO 29170-2 testing protocol.

  5. In-network adaptation of SHVC video in software-defined networks

    Science.gov (United States)

    Awobuluyi, Olatunde; Nightingale, James; Wang, Qi; Alcaraz Calero, Jose Maria; Grecos, Christos

    2016-04-01

    Software Defined Networks (SDN), when combined with Network Function Virtualization (NFV) represents a paradigm shift in how future networks will behave and be managed. SDN's are expected to provide the underpinning technologies for future innovations such as 5G mobile networks and the Internet of Everything. The SDN architecture offers features that facilitate an abstracted and centralized global network view in which packet forwarding or dropping decisions are based on application flows. Software Defined Networks facilitate a wide range of network management tasks, including the adaptation of real-time video streams as they traverse the network. SHVC, the scalable extension to the recent H.265 standard is a new video encoding standard that supports ultra-high definition video streams with spatial resolutions of up to 7680×4320 and frame rates of 60fps or more. The massive increase in bandwidth required to deliver these U-HD video streams dwarfs the bandwidth requirements of current high definition (HD) video. Such large bandwidth increases pose very significant challenges for network operators. In this paper we go substantially beyond the limited number of existing implementations and proposals for video streaming in SDN's all of which have primarily focused on traffic engineering solutions such as load balancing. By implementing and empirically evaluating an SDN enabled Media Adaptation Network Entity (MANE) we provide a valuable empirical insight into the benefits and limitations of SDN enabled video adaptation for real time video applications. The SDN-MANE is the video adaptation component of our Video Quality Assurance Manager (VQAM) SDN control plane application, which also includes an SDN monitoring component to acquire network metrics and a decision making engine using algorithms to determine the optimum adaptation strategy for any real time video application flow given the current network conditions. Our proposed VQAM application has been implemented and

  6. Discontinuity minimization for omnidirectional video projections

    Science.gov (United States)

    Alshina, Elena; Zakharchenko, Vladyslav

    2017-09-01

    Advances in display technologies both for head mounted devices and television panels demand resolution increase beyond 4K for source signal in virtual reality video streaming applications. This poses a problem of content delivery trough a bandwidth limited distribution networks. Considering a fact that source signal covers entire surrounding space investigation reviled that compression efficiency may fluctuate 40% in average depending on origin selection at the conversion stage from 3D space to 2D projection. Based on these knowledge the origin selection algorithm for video compression applications has been proposed. Using discontinuity entropy minimization function projection origin rotation may be defined to provide optimal compression results. Outcome of this research may be applied across various video compression solutions for omnidirectional content.

  7. Anthropocentric Video Segmentation for Lecture Webcasts

    Directory of Open Access Journals (Sweden)

    Raul Rojas

    2008-03-01

    Full Text Available Many lecture recording and presentation systems transmit slides or chalkboard content along with a small video of the instructor. As a result, two areas of the screen are competing for the viewer's attention, causing the widely known split-attention effect. Face and body gestures, such as pointing, do not appear in the context of the slides or the board. To eliminate this problem, this article proposes to extract the lecturer from the video stream and paste his or her image onto the board or slide image. As a result, the lecturer acting in front of the board or slides becomes the center of attention. The entire lecture presentation becomes more human-centered. This article presents both an analysis of the underlying psychological problems and an explanation of signal processing techniques that are applied in a concrete system. The presented algorithm is able to extract and overlay the lecturer online and in real time at full video resolution.

  8. Creating a clinical video-conferencing facility in a security-constrained environment using open-source AccessGrid software and consumer hardware.

    Science.gov (United States)

    Terrazas, Enrique; Hamill, Timothy R; Wang, Ye; Channing Rodgers, R P

    2007-10-11

    The Department of Laboratory Medicine at the University of California, San Francisco (UCSF) has been split into widely separated facilities, leading to much time being spent traveling between facilities for meetings. We installed an open-source AccessGrid multi-media-conferencing system using (largely) consumer-grade equipment, connecting 6 sites at 5 separate facilities. The system was accepted rapidly and enthusiastically, and was inexpensive compared to alternative approaches. Security was addressed by aspects of the AG software and by local network administrative practices. The chief obstacles to deployment arose from security restrictions imposed by multiple independent network administration regimes, requiring a drastically reduced list of network ports employed by AG components.

  9. StreamCat

    Data.gov (United States)

    U.S. Environmental Protection Agency — The StreamCat Dataset provides summaries of natural and anthropogenic landscape features for ~2.65 million streams, and their associated catchments, within the...

  10. Prioritized Contact Transport Stream

    Science.gov (United States)

    Hunt, Walter Lee, Jr. (Inventor)

    2015-01-01

    A detection process, contact recognition process, classification process, and identification process are applied to raw sensor data to produce an identified contact record set containing one or more identified contact records. A prioritization process is applied to the identified contact record set to assign a contact priority to each contact record in the identified contact record set. Data are removed from the contact records in the identified contact record set based on the contact priorities assigned to those contact records. A first contact stream is produced from the resulting contact records. The first contact stream is streamed in a contact transport stream. The contact transport stream may include and stream additional contact streams. The contact transport stream may be varied dynamically over time based on parameters such as available bandwidth, contact priority, presence/absence of contacts, system state, and configuration parameters.

  11. SCTP as scalable video coding transport

    Science.gov (United States)

    Ortiz, Jordi; Graciá, Eduardo Martínez; Skarmeta, Antonio F.

    2013-12-01

    This study presents an evaluation of the Stream Transmission Control Protocol (SCTP) for the transport of the scalable video codec (SVC), proposed by MPEG as an extension to H.264/AVC. Both technologies fit together properly. On the one hand, SVC permits to split easily the bitstream into substreams carrying different video layers, each with different importance for the reconstruction of the complete video sequence at the receiver end. On the other hand, SCTP includes features, such as the multi-streaming and multi-homing capabilities, that permit to transport robustly and efficiently the SVC layers. Several transmission strategies supported on baseline SCTP and its concurrent multipath transfer (CMT) extension are compared with the classical solutions based on the Transmission Control Protocol (TCP) and the Realtime Transmission Protocol (RTP). Using ns-2 simulations, it is shown that CMT-SCTP outperforms TCP and RTP in error-prone networking environments. The comparison is established according to several performance measurements, including delay, throughput, packet loss, and peak signal-to-noise ratio of the received video.

  12. Videoconference-based education for psychiatry registrars at the ...

    African Journals Online (AJOL)

    Video-conferencing has the potential to link registrars at satellite hospitals with academic centers. ... synchronous live streaming and asynchronous video teaching and general mental health training to general ..... movement of registrars and only a few registrars sat examinations during the period. This study did not address ...

  13. High-Quality Real-Time Video Inpaintingwith PixMix.

    Science.gov (United States)

    Herling, Jan; Broll, Wolfgang

    2014-06-01

    While image inpainting has recently become widely available in image manipulation tools, existing approaches to video inpainting typically do not even achieve interactive frame rates yet as they are highly computationally expensive. Further, they either apply severe restrictions on the movement of the camera or do not provide a high-quality coherent video stream. In this paper we will present our approach to high-quality real-time capable image and video inpainting. Our PixMix approach even allows for the manipulation of live video streams, providing the basis for real Diminished Reality (DR) applications. We will show how our approach generates coherent video streams dealing with quite heterogeneous background environments and non-trivial camera movements, even applying constraints in real-time.

  14. Automatic Association of Chats and Video Tracks for Activity Learning and Recognition in Aerial Video Surveillance

    Directory of Open Access Journals (Sweden)

    Riad I. Hammoud

    2014-10-01

    Full Text Available We describe two advanced video analysis techniques, including video-indexed by voice annotations (VIVA and multi-media indexing and explorer (MINER. VIVA utilizes analyst call-outs (ACOs in the form of chat messages (voice-to-text to associate labels with video target tracks, to designate spatial-temporal activity boundaries and to augment video tracking in challenging scenarios. Challenging scenarios include low-resolution sensors, moving targets and target trajectories obscured by natural and man-made clutter. MINER includes: (1 a fusion of graphical track and text data using probabilistic methods; (2 an activity pattern learning framework to support querying an index of activities of interest (AOIs and targets of interest (TOIs by movement type and geolocation; and (3 a user interface to support streaming multi-intelligence data processing. We also present an activity pattern learning framework that uses the multi-source associated data as training to index a large archive of full-motion videos (FMV. VIVA and MINER examples are demonstrated for wide aerial/overhead imagery over common data sets affording an improvement in tracking from video data alone, leading to 84% detection with modest misdetection/false alarm results due to the complexity of the scenario. The novel use of ACOs and chat Sensors 2014, 14 19844 messages in video tracking paves the way for user interaction, correction and preparation of situation awareness reports.

  15. Productivity of Stream Definitions

    NARCIS (Netherlands)

    Endrullis, J.; Grabmayer, C.A.; Hendriks, R.D.A.; Ishihara, A.; Klop, J.W.

    2010-01-01

    We give an algorithm for deciding productivity of a large and natural class of recursive stream definitions. A stream definition is called 'productive' if it can be evaluated continually in such a way that a uniquely determined stream in constructor normal form is obtained as the limit. Whereas

  16. Productivity of Stream Definitions

    NARCIS (Netherlands)

    Endrullis, Jörg; Grabmayer, Clemens; Hendriks, Dimitri; Isihara, Ariya; Klop, Jan

    2007-01-01

    We give an algorithm for deciding productivity of a large and natural class of recursive stream definitions. A stream definition is called ‘productive’ if it can be evaluated continuously in such a way that a uniquely determined stream is obtained as the limit. Whereas productivity is undecidable

  17. Productivity of stream definitions

    NARCIS (Netherlands)

    Endrullis, J.; Grabmayer, C.A.; Hendriks, D.; Isihara, A.; Klop, J.W.

    2008-01-01

    We give an algorithm for deciding productivity of a large and natural class of recursive stream definitions. A stream definition is called ‘productive’ if it can be evaluated continually in such a way that a uniquely determined stream in constructor normal form is obtained as the limit. Whereas

  18. Video over cognitive radio networks when quality of service meets spectrum

    CERN Document Server

    Mao, Shiwen

    2014-01-01

    This book focuses on the problem of video streaming over emerging cognitive radio (CR) networks. The book discusses the problems and techniques for scalable video streaming over cellular cognitive radio networks, ad hoc CR networks, cooperative CR networks, and femtocell CR networks. The author formulates these problems and proposes optimal algorithms to solve these problems. Also, the book analyzes the proposed algorithms and validates the algorithms with simulations.

  19. Acoustic Neuroma Educational Video

    Medline Plus

    Full Text Available ... support group for me? Find a Group Upcoming Events Video Library Photo Gallery One-on-One Support ... group for me? Find a group Back Upcoming events Video Library Photo Gallery One-on-One Support ...

  20. Video Games and Citizenship

    National Research Council Canada - National Science Library

    Bourgonjon, Jeroen; Soetaert, Ronald

    2013-01-01

    ... by exploring a particular aspect of digitization that affects young people, namely video games. They explore the new social spaces which emerge in video game culture and how these spaces relate to community building and citizenship...