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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD><TITLE>Pgmtexture User Manual</TITLE></HEAD>
<BODY>
<H1>pgmtexture</H1>
Updated: 22 Aug 1991
<BR>
<A HREF="#index">Table Of Contents</A>
<A NAME="lbAB"> </A>
<H2>NAME</H2>
pgmtexture - calculate textural features on a PGM image
<A NAME="lbAC"> </A>
<H2>SYNOPSIS</H2>
<B>pgmtexture</B>
[<B>-d</B> <I>d</I>]
[<I>pgmfile</I>]
<A NAME="lbAD"> </A>
<H2>DESCRIPTION</H2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pgmtexture</b> 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 <I>d</I> (default = 1).
<p>Textural features include:
<UL>
<LI>Angular Second Moment
<LI>Contrast
<LI>Correlation
<LI>Variance
<LI>Inverse Difference Moment
<LI>Sum Average
<LI>Sum Variance
<LI>Sum Entropy
<LI>Entropy
<LI>Difference Variance
<LI>Difference Entropy
<LI>Information Measures of Correlation
<LI>Maximal Correlation Coefficient
</UL>
<P>Algorithm taken from: <CITE>Haralick, R.M., K. Shanmugam, and
I. Dinstein. 1973. Textural features for image classification.
<I>IEEE Transactions on Systems, Man, and Cybertinetics,</I>
SMC-3(6):610-621.</cite>
<A NAME="lbAE"> </A>
<H2>LIMITATIONS</H2>
<p>The program can run incredibly slow for large images (larger than
64 x 64) and command line options are limited. The method for finding
the Maximal Correlation Coefficient, which requires finding the second
largest eigenvalue of a matrix Q, does not always converge.
<H2>SEE ALSO</H2>
<A HREF="pgm.html">pgm</A>,
<A HREF="pamsharpness.html">pamsharpness</A>,
<A HREF="pamsharpmap.html">pamsharpmap</A>,
<A HREF="pgmedge.html">pgmedge</A>,
<A HREF="pgmminkowski.html">pgmminkowski</A>
<A NAME="lbAH"> </A>
<H2>AUTHOR</H2>
Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for
hire of James Darrell McCauley.
<HR>
<A NAME="index"> </A>
<H2>Table Of Contents</H2>
<UL>
<LI><A HREF="#lbAB">NAME</A>
<LI><A HREF="#lbAC">SYNOPSIS</A>
<LI><A HREF="#lbAD">DESCRIPTION</A>
<LI><A HREF="#lbAE">BUGS</A>
<LI><A HREF="#lbAG">SEE ALSO</A>
<LI><A HREF="#lbAH">AUTHOR</A>
</UL>
</BODY>
</HTML>
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