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Mean Filter

The Mean or Average filter is used to soften an image by averaging surrounding pixel values.

For example, given the grayscale 3x3 pixel window;

22 77 48
150 77 158
0 77 219

Center pixel = (22+77+48+150+77+158+0+77+219)/9

The center pixel would be changed from 77 to 92 as that is the mean value of all surrounding pixels.

This filter is often used to smooth images prior to processing. It can be used to reduce pixel flicker due to overhead fluorescent lights.

Interface

Instructions

1. Select the window size of the mean filter

Example

SourceMean

See Also


Median


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