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cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]167<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
168
169<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
170_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
171<div class="doc-section">
172
173<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>
174
175<pre class="text">
176 channel_features=GetImageChannelFeatures(image,1,excepton);
177 contrast=channel_features[RedChannel].contrast[0];
178</pre>
179
180<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
181
182<p>The format of the GetImageChannelFeatures method is:</p>
183
184<pre class="code">
185 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]186 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]187</pre>
188
189<p>A description of each parameter follows:</p></ol>
190
191<h5>image</h5>
192<ol><p>the image.</p></ol>
193
194<h5>distance</h5>
195<ol><p>the distance.</p></ol>
196
197<h5>exception</h5>
198<ol><p>return any errors or warnings in this structure.</p></ol>
199
200 </div>
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