| 摘要 |
PROBLEM TO BE SOLVED: To efficiently compress pseudo medium tone image data generated by error spread processing in soft ware processing by a microprocessor. SOLUTION: Any of states S0-S3 is selected as a state value S on the basis of a consecutive 0-bit number X, a consecutive 1-bit number Y, a value A just before the X, and a value B just before the Y, a value just before the S is selected as a T, and on the incidence of a dissident event, a state code Q denoting the state value S is generated. On the incidence of a coincident event in the case of X≠A, a numeral code P denoting the value X is generated, and in the case of Y≠B, a numeral code P denoting the value Y is generated, and on the incidence of a regression event, a numeral code P denoting a value of a reparative number N is generated prior to the production of the state code.
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