Video Compression Algorithms for Transmission and Video.

During the past year, we have continued our efforts in image and video compression. We developed a real time software only scalable video compression codec. We have also optimized the scalable coder for transmission over wireless links by jointly optimizing the channel and source coders. We also have developed a video retrieval algorithm using motion, size, and color. We constrained the algorithm to be able to retrieve video in real time and only using information available in compressed bit-streams. In the are of video compression, we continued improving video coding using matching pursuits. We improved the coding efficiency performance by more than 1 dB for many of MPEG-4 test sequences. We have worked on reducing the complexity of the encoder and developed a real time software only low bit rate encoder. We also addressed the error resilience issue and developed a more error resilient matching pursuit video codec that performs as well as original coder, if not better.