| 摘要 |
An adaptive contrast enhancement method and device provide video signal contrast enhancement with reduced noise amplification. The video signal has a plurality of temporally ordered digital pictures, each one of the digital pictures represented by a set of samples, wherein each one of the samples has a gradation level. A contrast enhancement transform is constructed for enhancing the contrast of the video signal, and transform ratios are computed based on the contrast enhancement transform. Then the smoothed transform ratios are then applied to a set of samples representing a digital picture to enhance contrast of the digital picture with reduced noise amplification.
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