| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To effectively keep a pre-filtered DC value of a block even after filtering. <P>SOLUTION: A filtering part 42 applies, to each of regions to be filtered, filtering using information on regions around. A subtraction unit 44 calculates a difference valueαbetween a pre-filtered average pixel value DC0 and a post-filtered average pixel value DC'0 for a block being a set of a plurality of regions adjacent to one another. A block correction part 45 corrects the post-filtered block by distributing the difference valueαto each of the regions in the block so that the post-filtered average pixel value comes close to the DC0. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
