A feedback system for graphics video coding and networking

This paper presents feedback design of a desktop visual communications system. The system consists of video coding using a 3-D graphics model and video transmission over the Internet. To reduce the overall video quality degradation in visual communications caused by coding and networking errors, we jointly researched the compression and transmission of video signals. In building the 3-D graphics model-based coding structure, instead of using feedforward based on pixel intensity, we develop a three-level signal representation and an analysis-by-synthesis feedback framework. In prototyping the video over IP in desktop conferencing, we adapt the video encoders coding rates based on feedback of the network states and receivers. We therefore contribute to the analysis, modeling, and transmission of multimedia signals for desktop visual communications