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cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]173<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
174
175<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
176_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
177<div class="doc-section">
178
179<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>
180
181<pre class="text">
182 channel_features=GetImageChannelFeatures(image,1,excepton);
183 contrast=channel_features[RedChannel].contrast[0];
184</pre>
185
186<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
187
188<p>The format of the GetImageChannelFeatures method is:</p>
189
190<pre class="code">
191 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]192 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]193</pre>
194
195<p>A description of each parameter follows:</p></ol>
196
197<h5>image</h5>
198<ol><p>the image.</p></ol>
199
200<h5>distance</h5>
201<ol><p>the distance.</p></ol>
202
203<h5>exception</h5>
204<ol><p>return any errors or warnings in this structure.</p></ol>
205
206 </div>
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