Example standard deviation filters

A standard deviation filter may have any user-defined size. The filter calculates the standard deviation of the pixels considered, and assigns the answer to the center pixel in the output map.

Example 1:

When the filter is defined as a 3x3 filter and when 9 pixel values in an input map are:

17

22

18

21

15

18

17

20

23

The filter calculates:

Thus, value 2.65 is assigned to the central pixel in the output map.

Example 2:

When the filter is defined as a 1 by 5 filter, and 5 values in an input map are:

17

22

18

18

15

The filter calculates:

Thus, value 5.1 is assigned to the central pixel in the output map.