RankFilter() simple question

[4evam3]

Hi everybody,
I just need to know how does the method "rank" from the class RankFilter work.
What does the <radius> parameter mean? if I put the radius value = 1, does it mean a filtering with a 1x1 kernel? I'm a bit confused.
Sorry for my bad english. Thanks all

[David Webster]

Interpret radius as 1/2(more or less) the diameter. That is thew kernal's
diameter or width is 2*radius+1.

[4evam3]

David Webster wrote

Interpret radius as 1/2(more or less) the diameter. That is thew kernal's
diameter or width is 2*radius+1.

many thanks! :)