When is the contrast stretching transformation a thresholding function, for r and s as gray-value of image before and after processing respectively?(a) r1 = s1 and r2 = s2(b) r1 = r2, s1 = 0 and s2 = L – 1, L is the max gray value allowed(c) r1 = 1 and r2 = 0(d) None of the mentionedI had been asked this question in an interview for internship.My question is based upon Piecewise-Linear Transformation Functions topic in section Intensity Transformations and Spatial Filtering of Digital Image Processing

When is the contrast stretching transformation a thresholding function

1.	When is the contrast stretching transformation a thresholding function, for r and s as gray-value of image before and after processing respectively?(a) r1 = s1 and r2 = s2(b) r1 = r2, s1 = 0 and s2 = L – 1, L is the max gray value allowed(c) r1 = 1 and r2 = 0(d) None of the mentionedI had been asked this question in an interview for internship.My question is based upon Piecewise-Linear Transformation Functions topic in section Intensity Transformations and Spatial Filtering of Digital Image Processing
Answer» The correct ANSWER is (b) R1 = r2, s1 = 0 and s2 = L – 1, L is the max gray value allowed Explanation: If r1 = r2, s1 = 0 and s2 = L – 1, the CONTRAST stretching transformation is a thresholding FUNCTION.

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