In contrast stretching, if r1=s1 and r2=s2 then which of the following is true?(a) The transformation is not a linear function that produces no changes in gray levels(b) The transformation is a linear function that produces no changes in gray levels(c) The transformation is a linear function that produces changes in gray levels(d) The transformation is not a linear function that produces changes in gray levelsThis question was posed to me by my college professor while I was bunking the class.The doubt is from Basic Intensity Transformation Functions topic in portion Intensity Transformations and Spatial Filtering of Digital Image Processing

In contrast stretching, if r1=s1 and r2=s2 then which of the following

1.	In contrast stretching, if r1=s1 and r2=s2 then which of the following is true?(a) The transformation is not a linear function that produces no changes in gray levels(b) The transformation is a linear function that produces no changes in gray levels(c) The transformation is a linear function that produces changes in gray levels(d) The transformation is not a linear function that produces changes in gray levelsThis question was posed to me by my college professor while I was bunking the class.The doubt is from Basic Intensity Transformation Functions topic in portion Intensity Transformations and Spatial Filtering of Digital Image Processing
Answer» Right answer is (b) The transformation is a linear function that PRODUCES no changes in GRAY levels To elaborate: The LOCATIONS of points (r1,s1) and (r2,s2) control the shape of the transformation function. If r1=s1 and r2=s2 then the transformation is a linear function that produces no changes in gray levels.

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