METHOD AND DEVICE FOR COMPRESSING PICTURE SIGNAL, METHOD AND DEVICE FOR RESTORING PICTURE SIGNAL, METHOD AND DEVICE FOR COMPRESSING AND RESTORING PICTURE SIGNAL AND PRINTER

摘要

PROBLEM TO BE SOLVED: To improve a compressibility and to shorten the time of a restoration processing in the compression technique of picture signals using run length encoding. SOLUTION: At the time of one-dimensionally encoding and compressing the picture signals, a white (or black) run length at present calculated in a run length calculation part 1 is compared with the white (or black) run length stored one cycle earlier in a previous data storage part 2 in a comparison part 3. When they do not match, a code chart 6 prepared beforehand is referred to and conversion to codes is performed in a code conversion part 4. When they match, the conversion to prescribed repetitive codes is performed in a repetitive code conversion part 5 without referring to the code chart 6.