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Median filter belongs to which category of filters?

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Median filter belongs to which category of filters?

(a) Linear spatial filter

(b) Frequency domain filter

(c) Order static filter

(d) Sharpening filter

The question was asked in examination.

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

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The correct choice is (c) Order static filter

For explanation: The median filter belongs to order static filters, which, as the name implies, replaces the value of the pixel by the median of the gray levels that are present in the neighbourhood of the pixels.

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