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Which of the following is/are used as basic function in nonlinear filter for noise reduction?

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Which of the following is/are used as basic function in nonlinear filter for noise reduction?

(a) Computation of variance

(b) Computation of median

(c) All of the mentioned

(d) None of the mentioned

The question was asked in my homework.

This is a very interesting question from Spatial Filtering topic in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

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The correct choice is (b) Computation of median

To explain I would say: Computation of median gray-level value in the neighborhood is the basic function of nonlinear filter for noise reduction.

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