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In Image Averaging enhancement method assumptions are made for a noisy image g(x, y). What is/are those?

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In Image Averaging enhancement method assumptions are made for a noisy image g(x, y). What is/are those?

(a) The noise is correlated at every pair of coordinate (x, y)

(b) The noise has average value 1 at every pair of coordinate (x, y)

(c) All of the mentioned

(d) None of the mentioned

The question was asked in an international level competition.

Question is from Enhancement using Arithmetic Operations topic in portion Image Enhancement of Digital Image Processing

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The correct answer is (d) None of the mentioned

Easy explanation: In Image Averaging enhancement method assumptions are made for a noisy image g(x, y) that at every coordinate (x, y) the noise has 0 average value and must be uncorrelated.

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