Subband based CCITT compatible coding for HDTV conferencing

A motion-compensated interframe subband coding algorithm suitable for a wide range of video coding applications is described. In this approach, the spectrum of each frame of video signals is first decomposed into smaller frequency bands in which each can be coded accordingly. For the best performance a combination of hybrid pulse-code modulation discrete cosine transform/differential pulse-code modulation (DCT/DPCM), interframe DPCM, and interframe pulse-code modulation (PCM) was considered. The subband coder is designed to encode the video in two separate layers for a dual-quality video representation. Simulations were performed using HDTV sequences as input. For two-layer structure coding, results are given at an average rate of 1.5 Mb/s for the basic layer and 5.62 Mb/s for the full HDTV resolution. Statistical multiplexing using two-level scheduling/priority is also considered and the effect of cell dropping on the quality of the reconstructed video signal is investigated