| 摘要 |
PROBLEM TO BE SOLVED: To process an inputted picture at a high speed. SOLUTION: An error correction means 2 which corrects an error distributed to a processing object picture element with respect to an inputted input picture, a threshold processing means which uses a threshold Th to binarize the corrected picture element, and an error calculation means 10 which calculates an error from the corrected picture element and possible output levels in accordance with the result of the threshold processing are provided, and they are so constituted that the calculated error may be distributed to peripheral picture elements, and a part of the processing is taken outside a feedback loop so that the path to calculate the error to the just adjacent picture element may be shortest, thereby the processing at a high speed is performed.
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