Patent ID: 8213054
Filing Date: 2012-07-03
Classification: H04N

Abstract:
1. An image processing apparatus comprising: a dividing portion that divides input multivalue image data into a plurality of bands; an error diffusion process portion that carries out an error diffusion process on each divided band; and a controlling portion that controls the dividing portion and the error diffusion process portion, wherein the error diffusion process portion follows control by the controlling portion to operate in a first mode and in a second mode, the error diffusion process portion in the first mode repeating an error diffusion process given times on each pixel included in only a given line of the each band without adding an error value to pixels in other lines of the each band, and the error diffusion process portion in the second mode carrying out an error diffusion process on the each band sequentially from a head line of the each band on the basis of the error value obtained in the first mode, and a number of surrounding pixels used in the first mode is smaller than a number of the surrounding pixels used in the second mode.