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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]178<h1>Module feature
179 Methods</h1>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]180<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
181
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]182<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/feature
183_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]184<div class="doc-section">
185
186<p>GetImageChannelFeatures() returns features for each channel in the image in each of four directions (horizontal, vertical, left and right diagonals) for the specified distance. The features include the angular second moment, contrast, correlation, sum of squares: variance, inverse difference moment, sum average, sum varience, sum entropy, entropy, difference variance, difference entropy, information measures of correlation 1, information measures of correlation 2, and maximum correlation coefficient. You can access the red channel contrast, for example, like this:</p>
187
188<pre class="text">
189 channel_features=GetImageChannelFeatures(image,1,excepton);
190 contrast=channel_features[RedChannel].contrast[0];
191</pre>
192
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]193<p>Use MagickRelinquishMemory() to free the features buffer.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]194
195<p>The format of the GetImageChannelFeatures method is:</p>
196
197<pre class="code">
198 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]199 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]200</pre>
201
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]202<p>A description of each parameter follows:</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]203
204<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]205<p>the image.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]206
207<h5>distance</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]208<p>the distance.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]209
210<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]211<p>return any errors or warnings in this structure.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]212
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