thn_lc
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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) is
foreground, and white (255) is background.
This method is simply an extension of Zhang and Suen's
method. First, Zhang and Suen's methhod is used. The skeleton
thus obtained is not truly 8-connected, since some
non-junction pixels have more than two neighbors, making the
skeleton useless for algorithms that require this constraint.
Therefore, some pixels have to be removed. The skeleton is
inspected, and each pixel is tested using a lookup table. The
result is a true 8-connected skeleton where only junction
pixels have more than two 8-neighbors.
Restrictions
inimage must have bands with pixel type unsigned byte.
The input is assumed to be binary valued with foreground = 0,
background = 255.
See also
thn_lc(3), thn_har(1), thn_zs(1)
Reference
-
H.-J. Lee and B. Chen,
- "Recognition of handwritten chinese characters via short
line 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 $