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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame^]170<h1>Module feature
171 Methods</h1>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]172<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
173
174<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
175_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
176<div class="doc-section">
177
178<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>
179
180<pre class="text">
181 channel_features=GetImageChannelFeatures(image,1,excepton);
182 contrast=channel_features[RedChannel].contrast[0];
183</pre>
184
185<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
186
187<p>The format of the GetImageChannelFeatures method is:</p>
188
189<pre class="code">
190 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]191 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]192</pre>
193
194<p>A description of each parameter follows:</p></ol>
195
196<h5>image</h5>
197<ol><p>the image.</p></ol>
198
199<h5>distance</h5>
200<ol><p>the distance.</p></ol>
201
202<h5>exception</h5>
203<ol><p>return any errors or warnings in this structure.</p></ol>
204
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