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Which of the following histogram processing techniques is global?

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Which of the following histogram processing techniques is global?

(a) Histogram Linearization

(b) Histogram Specification

(c) Histogram Matching

(d) All of the mentioned

I have been asked this question during an online exam.

My doubt stems from Histogram Specification and Use of Histogram Statistics for Image Enhancement in portion Image Enhancement of Digital Image Processing

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The correct option is (d) All of the mentioned

To explain I would say: All of the mentioned methods modifies the pixel value by transformations that are based on the gray-level of the whole image.

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