Patent ID: 8098406
Filing Date: 2012-01-17
Classification: H04N

Abstract:
1. An image forming apparatus for performing dither processing on image data to form an image subjected to pseudo-halftone processing, the image forming apparatus comprising: a dither processing unit configured to perform dither processing on image data; and a dither pattern generation unit configured to generate a dither matrix for use in said dither processing, in accordance with an output gradation level, wherein said dither matrix has a size of M×N pixels, and has a plurality of halftone dots arranged in a predetermined pattern in accordance with said output gradation level in order to represent a gradation of each color, said plurality of halftone dots are arranged in said dither matrix such that the halftone dots corresponding to at least two colors are substantially identical in color area ratio to each other in said dither matrix irrespective of a relative position with respect to the colors; and said dither matrix includes basic patterns, and said basic patterns coming into contact with each other in a vertical direction are displaced mutually in a lateral direction.