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cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]162<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
163
164<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
165_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
166<div class="doc-section">
167
168<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>
169
170<pre class="text">
171 channel_features=GetImageChannelFeatures(image,1,excepton);
172 contrast=channel_features[RedChannel].contrast[0];
173</pre>
174
175<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
176
177<p>The format of the GetImageChannelFeatures method is:</p>
178
179<pre class="code">
180 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]181 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]182</pre>
183
184<p>A description of each parameter follows:</p></ol>
185
186<h5>image</h5>
187<ol><p>the image.</p></ol>
188
189<h5>distance</h5>
190<ol><p>the distance.</p></ol>
191
192<h5>exception</h5>
193<ol><p>return any errors or warnings in this structure.</p></ol>
194
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