MAN page from RedHat Other XITE-3.3-3.i386.rpm
SEGMSPANNWILSON
Section: User Commands (1)
Updated: 16 Mar 1998
Index
NAME
segmSpannWilson - segmentation by the Spann and Wilson method
SYNTAX
segmSpannWilson [-m <m>] [-mean] [-median] [-eq] [-s <s>]
<inimage> <outimage>
DESCRIPTION
Performs segmentation of every band in the
inimageimage(separately) into the
outimageimage. The algorithm hasthree steps:
- Quad-tree smoothing
A quad-tree is created, and pixels are averaged 4 by 4up in the quad-tree. nquad-tree levels are created,including the bottom level, which is inband.
- Local centriod clustering
The topmost quad-tree level is clustered by moving histogrammass to the centroid (mean or median) of a local window movedover the histogram. Applied iteratively, until stable. SeethresMlCentroid.
- Boundary estimation
The classification result is copied down the quad-tree, but atevery level, all pixels close to a differently classified pixelare reclassified to determine the border more precisely.
OPTIONS
- -n n
- Quad-tree levels. Default = 4.
- -m m
- Use histogram window of size (2*m)+1.Default = 0, implying search for stable value.
- -mean
- Move histogram mass to local mean (default).
- -median
- Move histogram mass to local median.
Use either -meanor -median(or none), not both.If no -moption is given, a loop over the m-values5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 is performed,exiting if two consecutive runs give the same thresholdingresult.
SEE ALSO
segmSpannWilson(3),
thresMlCentroid(1),
segmRandom(1)
DIAGNOSTICS
Warning: Bad pixel type in band ..
Warning: Clustering never stable
Error : Bad m value: ..
Error : Bad number of arguments
RESTRICTIONS
inimagemust have bands with pixel type unsigned byte.Bands are handled one at a time, not multi-dimensionally.
REFERENCE
- M. Spann and R. Wilson,
- "A Quad-three Approach to Image Segmentation whichCombines Statistical and Spatial Information"Pattern Recognition, Vol 18, Nos 3/4, pp 257-269, 1985
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO
EXAMPLES
segmSpannWilson -median mona.img monaseg.img
segmSpannWilson -mean -n 3 mona.img monaseg.img
segmSpannWilson -m 25 -verbose mona.img monaseg.img
ID
$Id: segmSpannWilson.c,v 1.25 1997/01/16 16:08:53 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- OPTIONS
- SEE ALSO
- DIAGNOSTICS
- RESTRICTIONS
- REFERENCE
- AUTHOR
- EXAMPLES
- ID
This document was created byman2html,using the manual pages.
