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THRESMLCENTROID
Section: User Commands (1)
Updated: 16 Mar 1998
Index
NAME
thresMlCentroid - multi level thresholding by local centroidmethod
SYNTAX
thresMlCentroid [-m <m>] [-mean] [-median] [-eq] [-s <s>]
<inimage> [<output>]
DESCRIPTION
For every band, the histogram is calculated. Then thehistogram is modified by moving histogram mass to thelocal centroid of a histogram window of size (2*
m)+1.The mapping from old to new histogram is analyzed,corresponding thresholds are calculated, and if anoutput image is specified, the input image is thresholded.If no output image is specified, the obtained thresholdsare written to standard output.
OPTIONS
- -m m
- Use histogram window of size (2*m)+1.
- -mean
- Move histogram mass to local mean (default).
- -median
- Move histogram mass to local median.
- -eq
- If outimageis given, distriibute output pixel values.
- -s s
- If outimageis given, scale pixel values with s.
Use either -meanor -median(or none), not both.If no margument 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
thresMl(1),
thresMlAppScale(3),
thresMlAppMean(3),
thresMlAppMedian(3),
thresMlApply(3),
histoCentroid(3),
thresMlCentroid(3),
mkComCur(3),
thresMlComCur(3),
thresMlComCur(1),
thresMlReddi(3),
thresMlReddi(1),
thresMlWaHa(3),
thresMlWaHa(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
- [1]
- R. Wilson. H Knutsson and G.H. Granlund"The operational definition of the position of lineand edge" Proc. ICPR-82, Munich 1982.
- [2]
- R. Wilson"A Class of local centroid algorithms forclassification and quantization in spaces of arbitrarydimension"Linkoping Univ, Internal Report LiTH-ISY-I-0610(1983).
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO
EXAMPLES
thresMlCentroid -median mona.img
thresMlCentroid -mean -eq mona.img res.img
thresMlCentroid -s 2 -m 25 mona.img res.img
thresMlCentroid -verbose mona.img
ID
$Id: thresMlCentroid.c,v 1.25 1997/01/14 13:06:21 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- OPTIONS
- SEE ALSO
- DIAGNOSTICS
- RESTRICTIONS
- REFERENCE
- AUTHOR
- EXAMPLES
- ID
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