Image processing apparatus, image forming apparatus, image processing method, program, and recording medium

摘要

A quantization error calculation portion calculates the difference between the pixel value of a pixel of an input image added with an accumulative error by the adder and the quantization value obtained by quantizing the pixel value in the quantization processing portion as a quantization error. The quantization error is stored in the error storage portion. The multiplier multiplies, a quantization error to be distributed to a subsequently-quantized pixel, among the quantization errors stored in the error storage portion, by the diffusion coefficient numerator value corresponding to the quantization error. The adder adds the multiplication result produced by the multiplier. The divider divides the addition result produced by the adder by the diffusion coefficient denominator value. The division result is outputted to the adder as an accumulative error for a subsequently-quantized pixel.