SRCとDPCMを用いた最適な合成画像の圧縮

概要

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SRC(structure runlength coding)[1] is an efficient coding for simple synthetic images. In the coding, only one of four (or five) symbols is substituted for each pixel. At the same time, additional 24bits stand for the color of a pixel which has no relation to its neighbors. With the increase of colors, however, those pixels with no relation to their neighbors increase fast. It decreases dramatically the efficiency of SRC. In this paper, we suggest to separate the symbol data and color data. The symbol data can be compressed by dictionary coding, and color data are processed by adaptive DPCM(differential pulse code modulation). The proposed method can reach the higher efficiency than the SRC, especially for images with many colors, at the cost of an additional buffer needed to store all compressed symbol data in a decoder.
社団法人電子情報通信学会の論文
1996-03-11