BINARY EXPRESSION PROCESSING METHOD FOR DITHER IMAGE, METHOD FOR UNCOMPRESSING DITHER IMAGE EXPRESSED IN COMPRESSION BINARY REPRESENTATION AND COMPRESSION AND UNCOMPRESSION SYSTEM FOR DITHER IMAGE

摘要

PROBLEM TO BE SOLVED: To compress dither image data effectively. SOLUTION: In a coding step 206, a compressed data stream is produced. The compressed data stream consists of a sequence of a copy element (to find out each equivalent class from a corresponding position of a precedingly decoded scanning line by instructing an uncompression system) and of a literal element (to obtain each equivalent class, directly from a compression data stream by instructing an uncompression system). Each copy element and each literal element denote a tile number extracted from image data.