DCT color image sequence coding

A new fully adaptive discrete cosine transform (DCT) based image sequence coding system is presented. A hierarchical search variable size block matching motion compensation scheme is first designed. It differs from the conventional block matching motion compensation for its fast search time and its ability to vary the block size to make a better trade-off between the required bit rate and picture quality. Connected to the compensation scheme is the DCT with block size varied adaptively to the block size derived from the motion compensator. Different gating functions are defined on the DCT to select the most efficient DCT coefficients in order to get the best performance. An adaptive quantizer and Huffman entropy coder are finally utilized to get the optimal coding result