Improved Huffmann code tables for still and video image encoders

Deals with the Huffman encoding phase of two well-known compression encoders, one that of the baseline algorithm proposed by JPEG for the compression of still images, and the other that of the H.261 based video encoder. We identify two types of minor redundancies in the input to the encoding phase, and present alternative Huffman code tables. Simulation results on still picture compressions indicate that the proposed redundancy reduction leads to an improvement of the order of 3.35% in the size of the image compressed at 75% quality level, and 5.3% when compressed at the 50% quality level, on the average.<>