Gray Scale Features Extracted from a Suspicious ROI

This approach to feature extraction extracts a set of F features from pixels comprising a suspicious ROI target, T, thus FROI ={fi, f2,---, fF}. A surrounding region labelled background, B, of the same area is constructed encircling the ROI, but comprising normal pixels. From pixels that comprise the target (T) and background (B) region, the following gray-level statistics are extracted: mean, standard deviation, entropy, skewness, and kurtosis. These are transformed into feature values by determining the ratio of the target value to background value (T/B) for each gray-scale statistic. The features reflect the mathematical composition of the quantitative measure of contrast enhancement previously proposed.

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