IMAGE COMPRESSION APPARATUS, IMAGE EXTENSION APPARATUS, IMAGE DATA, IMAGE PROCESSING METHOD, EDGE DETECTION METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an image compression apparatus for compressing image data while suppressing deterioration in picture quality. SOLUTION: An image processing apparatus 2 generates data set values including the gradation values of a plurality of pixels and a plurality of color components (Y, Cr and Cb components) in each image block of 2×2 size, subsamples (thins) the color components of the Cb and Cr components included in the data set values in accordance with whether a CG edge is included in the image block or not, and then encodes these data set values by a predictive coding method. COPYRIGHT: (C)2007,JPO&INPIT