ABOUT LINGUISTIC RULE SYSTEM AND APPLICATION IN COLOUR IMAGE CONTRAST ENHANCEMENT

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Abstract

Image contrast enhancement has two main methods: (1) indirect method and (2) direct method. The indirect method is only to modify the histogram, which is not efficient and effective since it only stretches the global distribution of the intensity, the direct method is to define a measurement of the contrast and stretches on each pixel of the image. In the direct method, we have built the Hint operator based on a 5 rules linguistic system with only a hedge "Very" and solved by the Hedge Algebra. In this paper, we demonstrate that such a system of 5 rules has the same results as the system of 7 rules using two hedges "Very" and "Little".