QUANTIZATION DEVICE, THRESHOLD-MATRIX GENERATION METHOD, AND THRESHOLD MATRIX

摘要

Disclosed is a quantization device (200) that quantizes image data used in image formation by means of an image formation device in which a print head (H), which moves relative to recording media in a y direction, has a plurality of nozzles (N) provided along an x direction orthogonal to the y direction, at least. Said quantization device is provided with: an acquisition unit (201) that acquires image data; a memory unit (202) that stores a threshold matrix; and a quantization processing unit (203) that quantizes the image data on the basis of the image data and the threshold matrix. The threshold matrix is generated on the basis of a plurality of matrix values that indicate the presence or absence of dots in a plurality of dot patterns that have different tone values (g), being generated under layered constraint conditions and corresponding to a prescribed pixel region. In said dot patterns having tone values in the range g 1 = g g 2 , a plurality of pixels that form each dot are contiguous in the X direction or the Y direction.