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THN_LC

Section: User Commands (1)
Updated: 16 Mar 1998
Index

NAME

thn_lc - Lee and Chen's thinning method.

SYNTAX

thn_lc <inimage> <outimage>

DESCRIPTION

Thin a binary image with Lee and Chen's method. Black (0) isforeground, and white (255) is background.

This method is simply an extension of Zhang and Suen'smethod. First, Zhang and Suen's methhod is used. The skeletonthus obtained is not truly 8-connected, since somenon-junction pixels have more than two neighbors, making theskeleton useless for algorithms that require this constraint.Therefore, some pixels have to be removed. The skeleton isinspected, and each pixel is tested using a lookup table. Theresult is a true 8-connected skeleton where only junctionpixels have more than two 8-neighbors.

RESTRICTIONS

inimagemust have bands with pixel type unsigned byte.The input is assumed to be binary valued with foreground = 0,background = 255.

REFERENCE

H.-J. Lee and B. Chen,

"Recognition of handwritten chinese characters via shortline segments,"Pattern Recognition,vol. 25, no. 5, pp. 543-552, 1992.

FILES

xite/src/thin/thn_lc.c

AUTHOR

Řivind Due Trier, late one night at Michigan State University.

ID

$Id: thn_lc.c,v 1.13 1997/01/16 16:11:49 svein Exp $

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