Low bit rate teleconferencing video signal data compression

A new high compression algorithm of teleconferencing image sequence data is proposed. It is based on vector quantization (VQ) operating in the spatial domain and it is structured as a combination of an intraframe finite state (FS) algorithm with state label entropy encoding, followed by an interframe one, operating on a bundle of frames. The intraframe algorithm encodes the head frame of the bundle; the interframe algorithm follows, operating on the remaining frames. Then, the encoding process restarts with a new bundle of frames. Simulation experiments have been carried out for a videoconference image sequence, consisting of 20 frames of 112x96 pixels, with 25% average block motion. The representation vectors were of 2 x 2 x 4 resolution. The results obtained have shown that for PSNR = 32 db the required bit rate is 0.08 to 0.10 bits/pixel.