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If the histogram equalization on the basis of Retinex theory is used to an image, an excessive enhancement or darkening of brightness may arise. Aimed at these problems, this paper presents a parabolic adjustment of image clearness algorithm, which is mainly based on Retinex theory, equalizing histogram with the aid of parabolic transfer function, while stretching the contrast of image. Experimental...
According to the Retinex theory, the color of an object is jointly decided by its reflecting ability to three independent wave-length lights-lights of short, medium, and long wave. The reflecting ability of the object in a certain wave band is an immanence nature which does not rely on lamp-house itself. In the Retinex model, the brightness values of each pixel have been replaced by an ratio of the...
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