| 摘要 |
<P>PROBLEM TO BE SOLVED: To effectively reduce block noise produced in an image with many moving image components without making prominent blur in an image with few moving image components. Ž<P>SOLUTION: A gradation control apparatus according to one embodiment includes: a coring circuit 11 for changing the coring amount of a video signal according to the movement amount of the video signal; a smoothing circuit 12 for performing a gradation smoothing process on the video signal; and parameter control circuits 13-16 for acquiring a frame difference histogram as the movement amount of the video signal and changing an effect parameter for the gradation smoothing process according to the result of weighting the histogram. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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