Discussion
Min filter is a............. filter :
Answer: A
The min filter is an Order statistic filter.
Order statistic (rank) filters sort the pixel values in the neighbourhood and pick one by its rank. The median filter picks the middle value, the max filter the largest and the min filter the smallest (the 0th percentile). The min filter is useful for finding the darkest points and for removing salt (white) noise.
Averaging filters compute a mean rather than ranking values, and sharpening filters use derivatives to enhance edges. 'Noise reduction' describes a purpose that several filter families serve, not the class to which the min filter belongs.
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