Target to Background Contrast Enhancement Measurement Based on Standard Deviation

A key objective of a contrast enhancement is to maximize the difference between background and target mean gray level and ensure that the homogeneity of the mass is increased aiding the visualization of its boundaries and location. Using the ratio of the standard deviation of the gray-scales within the target before and after the enhancement, the improvement using the target to background contrast enhancement using standard deviation (TBCs) is given as

where the mean and standard deviation of the gray scales comprise the target and background before and after the enhancement. Assuming that the target has a smaller mean before and after enhancement compared to the background, it is expected that as a result of enhancement, this measure should give a value greater than zero.

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