Question

Diff between contrast stretching and histogram equalization

Answer 1

Contrast stretching is all about increasing the difference between the maximum intensity value in an image and the minimum one. All the rest of the intensity values are spread out between this range. There exists a one-to-one relationship of the intensity values between the source image and the target image i.e., the original image can be restored from the contrast-stretched image.

Histogram equalization is about modifying the intensity values of all the pixels in the image such that the histogram is "flattened" (in reality, the histogram can't be exactly flattened, there would be some peaks and some valleys, but that's a practical problem). Once histogram equalization is performed, there is no way of getting back the original image.

Answer 2

Difference between contrast stretching and histogram equalization is given below

Explanation:

• Contrast stretching means that the variance between the actual intensity value in an image is increased where as the equalization of the histogram requires changing of the brightness values of most of the pixels in the diagram to "flatten" the histogram.

• There is one to one relationship  is present in the contrast stretching in source to the destination value where as we will never getting the original image once we have performed the histogram .

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