Example rank order filters
An example of rank order filters, is for example the standard MED3x3 filter.
When 9 pixel values encountered in the input map are:
9 |
12 |
9 |
|
11 |
5 |
7 |
|
8 |
8 |
13 |
The MED3x3 filter orders these 9 values from small to large as:
5,7,8,8,9,9,11,12,13
and the value at rank order 5 is assigned to the pixel in the output map: 9.
You can also create your own user-defined rank order filters (defining filter size, rank order number that determines the output value, and optionally a threshold value).