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cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]164<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
165
166<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
167_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
168<div class="doc-section">
169
170<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>
171
172<pre class="text">
173 channel_features=GetImageChannelFeatures(image,1,excepton);
174 contrast=channel_features[RedChannel].contrast[0];
175</pre>
176
177<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
178
179<p>The format of the GetImageChannelFeatures method is:</p>
180
181<pre class="code">
182 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]183 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]184</pre>
185
186<p>A description of each parameter follows:</p></ol>
187
188<h5>image</h5>
189<ol><p>the image.</p></ol>
190
191<h5>distance</h5>
192<ol><p>the distance.</p></ol>
193
194<h5>exception</h5>
195<ol><p>return any errors or warnings in this structure.</p></ol>
196
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