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176
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]177<h1>Module feature
178 Methods</h1>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]179<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
180
181<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
182_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
183<div class="doc-section">
184
185<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>
186
187<pre class="text">
188 channel_features=GetImageChannelFeatures(image,1,excepton);
189 contrast=channel_features[RedChannel].contrast[0];
190</pre>
191
192<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
193
194<p>The format of the GetImageChannelFeatures method is:</p>
195
196<pre class="code">
197 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]198 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]199</pre>
200
201<p>A description of each parameter follows:</p></ol>
202
203<h5>image</h5>
204<ol><p>the image.</p></ol>
205
206<h5>distance</h5>
207<ol><p>the distance.</p></ol>
208
209<h5>exception</h5>
210<ol><p>return any errors or warnings in this structure.</p></ol>
211
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