When is the contrast stretching transformation a thresholding function, for r and s as gray-value of image before and after processing respectively?

r1 = r2, s1 = 0 and s2 = L – 1, L is the max gray value allowed

When is the contrast stretching transformation a thresholding functio

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 mentioned
Answer» C. r1 = 1 and r2 = 0

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When is the contrast stretching transformation a thresholding function, for r and s as gray-value of image before and after processing respectively?

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