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Today, by spreading a digital camera and a cellular phone with a camera, it has been easy to capture color images. But as the capturing condition is not always enough, the contrast of an image may not be good. This paper proposes a method to improve the contrast of a color image based on the distribution of edge strength of brightness included in an objective image. Output brightness of every pixel is determined according to a Look-up-table generated by using a histogram to represent a distribution of edge strength. Saturation of color is also converted according to the HIS color relation space. The experimental results show that the output color image by the proposed method had good and natural visual contrast compared with the conventional methods.

Contrast Improvement for Color Image Based on Edge Strength Distribution