rankfilter.c File Reference

rank filter More...

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Detailed Description

rank filter

Usage: rankfilter in.pgm el.pgm r out.pgm

Description: Let F be the input image, G be the output image, and E the structuring element. Let n be the number of elements of E, and R be the product n.r, then for each pixel p, G[p] is the Rth element of the sorted list (by increasing order) of the pixel values in the set { F[q], q in E[p] }.

Particular cases are the median filter (r = 0.5), the erosion (r = 0), and the dilation (r = 1).

Types supported: byte 2d, byte 3d

Category: morpho

Author:

Michel Couprie