JPS5748154A - Picture processing system - Google Patents

Abstract

PURPOSE:To make the mean density of an input picture and an output picture approach, and to correct the disappearance of a fine line, and the extent of thickness, by outputting a black and white deciding result of a remarkable picture element when deciding black or white, and correcting the density of a picture element whose black or white is decided from that time, in accordance with a density pattern of its peripheral picture element. CONSTITUTION:A buffer circuit 50 stores a multiplying picture element information temporarily, compares a density level of a specific picture element information in the circuit 50, with a threshold level by a black and white deciding circuit 62, and decides whether it is black or white. Subsequently, a remarkable picture element information that is the specific picture element information in the circuit 50 is converted to an output picture element information having one density level of a black level or a white level, and is outputted. In accordance with a density level of this output picture element information, a correcting circuit 64 outputs a different correcting value. Subsequently, the correcting value of the circuit 64 is added to a picture element information whose black or white has not been decided by the circuit 62, by a weight coefficient which is decided by a density pattern of a picture element information in the circuit 50.