JPS6418369A - Picture signal processor - Google Patents

Abstract

PURPOSE:To control the production of a texture in the error diffusion method and to apply density correction by selecting the distribution ratio of a binarization error with respect to peripheral picture elements together with picture element processing from plural arrangement coefficient sets at random and utilizing it. CONSTITUTION:An error operating means 110 obtains a correction error Hxy from a binarization error Exy from a differential arithmetic means 109 and a coefficient K1 taking a threshold level TH from a threshold level input terminal 106 as a function. An arrangement coefficient generating means 112 prepares in advance two arrangement coefficient sets with respect to an unprocessed picture element around the objective picture element, selects distribution coefficients KA-KD of a correction error Hxy to picture element positions A-D in the surrounding picture element region 102 at random and gives an output to an error distributing/updating means 111. The means 111 stores the coefficients KA-KD and the correction error Hxy to the objective picture element from the means 110 to a storage device corresponding to picture element positions A, C, D in the peripheral picture element area 102 of an error storage means 101 to obtain a new integrated circuit error, thereby applying the updating of the storage value in the means 101.