| 摘要 |
An image contrast enhancement apparatus and method thereof are provided. The image contrast enhancement apparatus includes an image analysis module, a histogram separation unit, and a histogram adjustment unit. The image analysis module statistically analyzes pixels of an original image to produce a plurality of histogram bins and combines the histogram bins into a sub-histogram. The histogram separation unit separates each sub-histogram in every separation level into two sub-histograms in the next separation level, increases or decreases a base width of each sub-histogram such that the respective group density of two sub-histograms corresponding to the same separation point are substantially identical. The histogram adjustment unit re-distributes histogram bins of each sub-histogram or merges a portion of histogram bins of each sub-histogram in every separation level.
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