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Comparison of the gray scale mean images histograms: A) rgb2gray (luminance) Chi-squared distances between the histograms of the four test backgrounds; B) rgb2lightness (lightness) Chi-squared distances between the histograms of the four test backgrounds; C) rgb2gray (luminance) Euclidean distances between the histograms of the four test backgrounds; D) rgb2lightness (lightness) Euclidean distances between the histograms of the four test backgrounds.

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