Patent ID: 6404917
Filing Date: 2002-06-11
Classification: G06T

Abstract:
An image compressor comprising:a color space converting unit for separating an input image data into a luminance data and a chrominance data; an image block-dividing unit for block-dividing each of the luminance and chrominance data separated by said color space converting unit into a plurality of blocks each of which includes adjacent pixels; a luminance threshold value determining unit for determining a threshold value with which a binarization of the luminance data block-divided in said image block-dividing unit is performed; a luminance binarizing unit for binarizing the block-divided luminance data using the threshold value determined by said luminance threshold value determining unit; a typical value forming unit for forming two typical values for each of the block-divided luminance and chrominance data in accordance with the luminance data binarized by said luminance binarizing unit; and a binarized luminance compressing unit for encoding the binarized luminance data using dictionaries whose number is smaller than the number of all combinations of the luminance data binarized by said luminance binarizing unit.