Image Contrast Enhancement Layer

In order to construct a scheme for the optimal selection of image enhancement, some quantitative indices are needed that measure the amount of enhancement. Not enough research has been conducted to tackle this difficult issue. In our previous work [19, 20] we introduced three new quantitative measures of image enhancement based on the change in contrast between the target (mass) and the backgound (a border 20 pixels wide around the target). We cover these measures for the sake of completeness here in section 11.3.1. In addition, we also discuss an independent measure of contrast called "difference in average separation" that has been popularly used in other work.

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