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What is the output of a smoothing, linear spatial filter?

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What is the output of a smoothing, linear spatial filter?

(a) Median of pixels

(b) Maximum of pixels

(c) Minimum of pixels

(d) Average of pixels

I got this question during an online interview.

This interesting question is from Smoothing Spatial Filters in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

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Correct choice is (d) Average of pixels

For explanation I would say: The output or response of a smoothing, linear spatial filter is simply the average of the pixels contained in the neighbourhood of the filter mask.

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