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Median Filter

The Median filter is used to remove noise from an image by replacing pixels with the middle pixel value selected from a certain window size.

For example, given the grayscale 3x3 pixel window;

22 77 48
150 77 158
0 77 219

Pixels sorted based on intensity: 0, 22, 48, 77, [77], 77, 150, 158, 219

The center pixel would be left at 77 since 77 is the middle value of the sorted list of pixels.

The median filter is very effective at removing noise while not destroying sharp edges in an image.

Interface

Instructions

1. Select the window size of the median filter

Example

SourceMedian

See Also


Mean Filter
Mode Filter


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