| Multipoint videoconferencing with scalable video coding |
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| 作者姓名： | ELEFTHERIADIS Alexandros CIVANLAR M.Reha SHAPIRO Ofer |
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| 作者单位： | Layered Media Inc.NJ 07662 USA，Layered Media Inc.NJ 07662 USA，Layered Media Inc.NJ 07662 USA |
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| 摘 要： | INTRODUCTION Modern videoconferencing systems allow two o more participants to communicate with each other in real-time using both audio and video. Conventionally when more than two participants are present, a sta configuration is generally employed, wherein a Mul tipoint Conferencing Unit (MCU), or bridge, is util ized to connect to all participants and coordinat communications between them. The general archi tecture is shown in Fig.1. Fig.1 Multipoint videoconferencing system Network…
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| 收稿时间： | 5 December 2005 |
| 修稿时间： | 1 March 2006 |
Multipoint videoconferencing with scalable video coding |
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| ELEFTHERIADIS Alexandros,CIVANLAR M.Reha,SHAPIRO Ofer.Multipoint videoconferencing with scalable video coding[J].Journal of Zhejiang University Science,2006,7(5):696-705. |
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| Authors: | Alexandros Eleftheriadis M Reha Civanlar Ofer Shapiro |
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| Institution: | Layered Media Inc., NJ07662, USA Layered Media Inc., NJ07662, USA Layered Media Inc., NJ07662, USA |
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| Abstract: | We describe a system for multipoint videoconferencing that offers extremely low end-to-end delay, low cost and complexity, and high scalability, alongside standard features associated with high-end solutions such as rate matching and personal video layout. The system accommodates heterogeneous receivers and networks based on the Internet Protocol and relies on scalable video coding to provide a coded representation of a source video signal at multiple temporal and spatial resolutions as well as quality levels. These are represented by distinct bitstream components which are created at each end-user encoder. Depending on the specific conferencing environment, some or all of these components are transmitted to a Scalable Video Conferencing Server (SVCS). The SVCS redirects these components to one or more recipients depending on, e.g., the available network conditions and user preferences. The scalable aspect of the video coding technique allows the system to adapt to different network conditions, and also accommodates different end-user requirements (e.g., a user may elect to view another user at a high or low spatial resolution). Performance results concerning flexibility, video quality and delay of the system are presented using the Joint Scalable Video Model (JSVM) of the forthcoming SVC (H.264 Annex G) standard, demonstrating that scalable coding outperforms existing state-of-the-art systems and offers the right platform for building next-generation multipoint videoconferencing systems. |
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| Keywords: | Multipoint videoconferencing Scalable video coding Multipoint control |
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