Compositing motion-compensated video within the network

As video applications become popular, the production of video sources can be spread geographicall y and chronically. Video sources produced at different locations or at different time can be composited into a singl e scene. Example applications include multi-point video conferencing, video editing/publishing and advance d workstation displays [1] . In this paper, we study the pros and cons of compositing video objects in the networ k nodes rather than in the final receiver sites . Tradeoffs exist between communication cost and other performanc e factors such as video quality and computational complexity . Especially, we focus on the video objects compressed with the Motion Compensation (MC) algorithm [3] since it causes extra overhead. We analyze sources o f the drawbacks, and quantify them with simulations of the real video sequence. We propose some methods to mitigate the drawbacks and retain the attractiveness of performing video compositing within the network .