Comparison of fixed-rate video codecs for wireless videophony

摘要

Gain-cost quantised, fixed but arbitrarily programmable rate discrete cosine transformed (DCT) video codecs, vector-quantised (VQ) and quad-tree (QT) coding algorithms are proposed and their video quality, complexity, compression ratio and errorresilience trade-offs are comparatively analysed under identical conditions. Our candidate codecs are compared to the standard H261 and MPEG2 benchmark codecs. The proposed codecs facilitate wireless videophony for quarter common intermediate format(QCIF) video sequences scanned at 10 frames/s at rates around 10 kbps in second-generation mobile systems.