COLOR IMAGE COMPRESSION BY MOMENT-PRESERVING AND BLOCK TRUNCATION CODING TECHNIQUES

A new color image compression technique based on moment-preserving and block truncation coding is proposed, An input image is divided into n onoverlapping blocks and each block pixel is assigned one of two repre sentative colors, which are computed with analytic formulas derived fr om preserving certain moments in the block. A bit map is then generate d for each block to represent the pixels' colors, Different uniformity conditions in the representative colors are also identified and utili zed to save code bits, Good average compression ratios up to about 13 can be achieved, as shown by experimental results.