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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Pgmtexture User Manual</title></head>
<body>
<h1>pgmtexture</h1>
Updated: 22 August 1991
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
pgmtexture - calculate textural features on a PGM image
<h2 id="synopsis">SYNOPSIS</h2>
<b>pgmtexture</b>
[<b>-d</b> <i>d</i>]
[<i>pgmfile</i>]
<h2 id="description">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>
<h2 id="options">OPTIONS</h2>
<p>In addition to the options common to all programs based on libnetpbm
(most notably <b>-quiet</b>, see <a href="index.html#commonoptions">
Common Options</a>), <b>pgmtexture</b> recognizes the following
command line option:
<dl compact>
<dt>-d <i>distance</i>
<dd>The distance. Default is 1.
</dl>
<h2 id="limitations">LIMITATIONS</h2>
<p>The method for finding the Maximal Correlation Coefficient, which requires
finding the second largest eigenvalue of a matrix Q, does not always converge.
<h2 id="seealso">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>
<h2 id="author">AUTHOR</h2>
Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for
hire of James Darrell McCauley.
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#limitations">LIMITATIONS</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#author">AUTHOR</a>
</ul>
</body>
</html>
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