Patent ID: 7570820
Filing Date: 2009-08-04
Classification: H04N

Abstract:
1. An image processing apparatus that converts input image data to output image data having two or more types of quantization data and outputs the output image data, comprising: a pixel group reference point determination unit that divides the input image data into predetermined pixel groups and determines a position of a reference point from grayscale values of respective pixels contained in the pixel groups; a pixel group expansion processor that takes the grayscale values of the part that is less than a threshold value from unprocessed pixels in periphery of the pixel group into the pixel group, if total of the grayscale values of the respective pixels contained in the pixel group is less than the threshold value based on each of values of the quantization data; and a quantization data supply unit that supplies the quantization data to a pixel on the basis of the position of the reference point determined by the pixel group reference point determination unit.