发明名称 |
Adaptive contrast enhancement method using time-varying nonlinear transforms on a video signal |
摘要 |
The contrast of a time varying video signal is enhanced. Each digital picture is represented by samples having gradation levels in a range from a lower limit C to an upper limit U. The mean value of the gradation levels of the samples representing a first digital picture is determined. A first transform function is constructed in dependence on a distribution of samples with gradation levels less than or equal to the mean value. A second transform function is constructed in dependence on a distribution of the samples with gradation levels equal to or greater than the mean. The first transform function and the second transform function are used to form a contrast enhancement transform, which is preferably constructed in the form of a look-up table. The contrast enhancement transform is applied to a set of samples representing the first digital picture or representing the temporally subsequent picture.
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申请公布号 |
US7042522(B2) |
申请公布日期 |
2006.05.09 |
申请号 |
US20020210237 |
申请日期 |
2002.08.01 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
KIM YEONG-TAEG |
分类号 |
H04N5/52;H04N5/20 |
主分类号 |
H04N5/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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