Image processing apparatus and image processing method for error diffusion halftoning with added green noise, and related computer readable storage medium

摘要

An image processing apparatus including an input unit which inputs a pixel value of a multi-level notice pixel, a first add unit which adds an error value to the input value, a second add unit which adds a green noise value to the input value, a threshold processing unit which outputs an binarized output value, a green noise calculation unit which calculates the green noise value, a subtract unit which calculates an error value due to binarization, an error diffusion unit which diffuses the calculated error value to an untreated pixel which is not yet binarized and a correction processing unit which adds a positive first offset to the error value to perform a correction and outputs the corrected error value to the first add unit.