\
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.TH "Pgmtexture User Manual" 1 "22 August 1991" "netpbm documentation"

.SH NAME

pgmtexture - calculate textural features on a PGM image

.UN synopsis
.SH SYNOPSIS

\fBpgmtexture\fP

[\fB-d\fP \fId\fP]

[\fIpgmfile\fP]

.UN description
.SH DESCRIPTION
.PP
This program is part of
.BR "Netpbm" (1)\c
\&.
.PP
\fBpgmtexture\fP reads a PGM image as input and calculates
textural features based on spatial dependence matrices at 0, 45, 90,
and 135 degrees for a distance \fId\fP (default = 1).
.PP
Textural features include:


.IP \(bu
Angular Second Moment
.IP \(bu
Contrast
.IP \(bu
Correlation
.IP \(bu
Variance
.IP \(bu
Inverse Difference Moment
.IP \(bu
Sum Average
.IP \(bu
Sum Variance
.IP \(bu
Sum Entropy
.IP \(bu
Entropy
.IP \(bu
Difference Variance
.IP \(bu
Difference Entropy
.IP \(bu
Information Measures of Correlation
.IP \(bu
Maximal Correlation Coefficient

     
.PP
Algorithm taken from: \fIHaralick, R.M., K. Shanmugam, and
I. Dinstein. 1973. Textural features for image classification.
\fIIEEE Transactions on Systems, Man, and Cybertinetics,\fP
SMC-3(6):610-621.\fP
     
.UN options
.SH OPTIONS
.PP
In addition to the options common to all programs based on libnetpbm
(most notably \fB-quiet\fP, see 
.UR index.html#commonoptions
 Common Options
.UE
\&), \fBpgmtexture\fP recognizes the following
command line option:



.TP
-d \fIdistance\fP
The distance.  Default is 1.



.UN limitations
.SH LIMITATIONS
.PP
The method for finding the Maximal Correlation Coefficient, which requires
finding the second largest eigenvalue of a matrix Q, does not always converge.

.UN seealso
.SH SEE ALSO
.BR "pgm" (1)\c
\&,
.BR "pamsharpness" (1)\c
\&,
.BR "pamsharpmap" (1)\c
\&,
.BR "pgmedge" (1)\c
\&,
.BR "pgmminkowski" (1)\c
\&

.UN author
.SH AUTHOR

Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for
hire of James Darrell McCauley. 
.SH DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source.  The master documentation is at
.IP
.B http://netpbm.sourceforge.net/doc/pgmtexture.html
.PP