JOINT OPTIMIZATION OF REPRESENTATION MODEL AND FRAME SEGMENTATION FORGENERIC VIDEO COMPRESSION

This paper describes a new image sequence compression system capable o f efficiently representing any type of visual data at very low bit-rat e. The coder presents a flexible structure open to evolution. Thanks t o a perfect rate and frame quality control, buffer regulation issue is solved. The technique relies on the joint optimization of two degrees of freedom, namely adaptive representation model and adaptive frame s upport partition. Optimization is performed in a rate-distortion sense and is based on the theory of optimal resources allocation. System pe rformances are evaluated in a particular environment, namely at very l ow bit-rate in the framework of video-telephony applications. Simulati on results demonstrate the efficiency of the system over bit-rates ran ging from 4.6 to 32 kbit/s.