lambdaskel.c File Reference

grayscale filtered topological skeleton More...

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Detailed Description

grayscale filtered topological skeleton

Usage: lambdaskel in.pgm {imcond.pgm|null} connex lambda out.pgm

Description: Filtered topological skeleton for 2D grayscale images. The parameter connex gives the connectivity used for the minima; possible choices are 4 and 8. The parameter lambda is a contrast parameter (positive integer). Let F be the function corresponding to the input image in.pgm. The parameter imcond.pgm is a constraint function G. The algorithm is the following:

Repeat until stability:
    Select a point p which is lambda-destructible for F or a peak
        such that F(p) > G(p) and such that F(p) is minimal
    F(p) = alpha-(p,F)
Result: F

Reference:
M. Couprie, F.N. Bezerra, Gilles Bertrand: "Topological operators for grayscale image processing", Journal of Electronic Imaging, Vol. 10, No. 4, pp. 1003-1015, 2001.

Types supported: byte 2d

Category: topogray

Author:

Michel Couprie