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【单选题】
Contrast stretching is a process that expands the range of intensity levels in an image so that it spans the full intensity range of the recording medium or display device 。Fig.1 shows a typical transformation used for contrast stretching.stretching.The locations of points (r1, s1) and (r2, s2) control the shape of the transformation function. with ( ), the contrast stretched image Fig.3 was obtained from the original image Fig.2. Fig.1 Fig.2 Fig.3A.
(r1, s1) = (rmin, 0) and (r2, s2) = (rmax, L - 1)
B.
(r1, s1) = (m, 0) and (r2, s2) = (m, L - 1), where m is the mean intensity level in the image
C.
r1 = r2, s1 = 0 , s2 = L - 1
D.
None of the above
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