| 摘要 |
PURPOSE:To attain an artificial half-tone display which is free from deterioration of the picture quality due to the deterioration of image resolution of binary pictures, by applying the picture processing repetitively to the entire areas of the 1st and 2nd picture signal memory means while shifting the 1st and 2nd scan windows by an amount equivalent to the prescribed picture elements. CONSTITUTION:A redistribution circuit 29 produces the conversion data from the sum total S obtained from a data addition circuit 25 and writes the conversion data successively to the address of a picture data memory 21 designated by an address control circuit 22 via a gate circuit 20. An error correction arithmetic circuit 26 selects a picture signal level P1ST, i.e., the finally data converted value within a scan window out of the conversion data of the circuit 29 based on the information on the address and the timing given from a sequencing circuit 28. Then the level P1ST is compared with a binary coding level V obtained from a binary coding circuit 23 to obtain the value P2ND of O or C, and the value P1ST-P2ND is given as an error correction amount E of the next scan window. Furthermore the result of comparison between the amount E and the level V is informed to an additional data addition circuit 27. Such a procedure is repeated to process picture signals.
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