Difference in Average Separation Measure

This measure is defined as the difference in average separation (AVS) [23] between the original and corresponding enhanced image. The average separation is a measure of intergroup dissimilarity and is defined as the average Euclidean distance d between "confused pixels," that is, pixels with the same gray scales found in both target and background regions. The AVS measure is defined as for all pairs of points such that a single point is drawn from each region, target &>i and background m2 with n1 and n2 pixels in total respectively. A large value of AVSdiff will result if the enhanced image has a greater intergroup dissimilarity for gray scales in the target and background region compared with that of the original. This increased value of AVSenhanced indicates that the enhancement has maximized the Euclidean distance of the confused pixels thereby resulting in an improved contrast enhancement.

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