What condition prevents the intensity artifacts to be created while processing with contrast stretching, if r and s are gray-values 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) r1 ≤ r2 and s1 ≤ s2I have been asked this question by my college professor while I was bunking the class.My doubt stems from Piecewise-Linear Transformation Functions in section Intensity Transformations and Spatial Filtering of Digital Image Processing

What condition prevents the intensity artifacts to be created while pr

1.	What condition prevents the intensity artifacts to be created while processing with contrast stretching, if r and s are gray-values 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) r1 ≤ r2 and s1 ≤ s2I have been asked this question by my college professor while I was bunking the class.My doubt stems from Piecewise-Linear Transformation Functions in section Intensity Transformations and Spatial Filtering of Digital Image Processing
Answer» The correct choice is (d) R1 ≤ r2 and s1 ≤ s2 To elaborate: While PROCESSING through contrast STRETCHING, if r1 ≤ r2 and s1 ≤ s2 is MAINTAINED, the function remains single valued and so monotonically increasing. This helps in the prevention of CREATION of intensity artifacts.

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