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Mode Filter

The Mode filter is used to remove noise from an image by replacing pixels with the most frequently occurring 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 based on frequency:

1 - 0
1 - 22
1 - 48
3 - 77
1 - 150
1 - 158
1 - 219

Thus the center pixel would be left at 77 since 77 is the most frequently occuring value in the list of pixels.

The mode filter (like 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 mode filter

Example

SourceMode

See Also


Mean Filter
Median Filter


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