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For a local enhancement using mean and variance, there is one condition: σs(x, y) ≤ k2DG, where, MDG is global standard deviation, k2 a positive constant and σs(x, y) a measure of contrast at point (x, y). Then, which fact is true for k2 if its values is greater than 1.0?

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For a local enhancement using mean and variance, there is one condition:  σs(x, y) ≤ k2DG,  where, MDG is global standard deviation, k2 a positive constant and σs(x, y) a measure of contrast at point (x, y). Then, which fact is true for k2 if its values is greater than 1.0?

(a) Enhancement is being done on light areas

(b) Enhancement is being done on dark areas

(c) Enhancement is being done independent of value of k0

(d) None of the mentioned

The question was posed to me during an interview.

Query is from Histogram Specification and Use of Histogram Statistics for Image Enhancement in section Image Enhancement of Digital Image Processing

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Right choice is (a) Enhancement is being done on light areas

The best explanation: In the condition σs(x, y) ≤ k2DG, k0 is a positive constants that helps in enhancing light areas if value is greater than 1.0 and dark areas if value is less than 1.0.

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