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cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]147</div>
148</div>
149
150
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152
153<div class="main">
154
155<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
156
157<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
158_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
159<div class="doc-section">
160
161<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>
162
163<pre class="text">
164 channel_features=GetImageChannelFeatures(image,1,excepton);
165 contrast=channel_features[RedChannel].contrast[0];
166</pre>
167
168<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
169
170<p>The format of the GetImageChannelFeatures method is:</p>
171
172<pre class="code">
173 ChannelFeatures *GetImageChannelFeatures(const Image *image,
174 const unsigned long distance,ExceptionInfo *exception)
175</pre>
176
177<p>A description of each parameter follows:</p></ol>
178
179<h5>image</h5>
180<ol><p>the image.</p></ol>
181
182<h5>distance</h5>
183<ol><p>the distance.</p></ol>
184
185<h5>exception</h5>
186<ol><p>return any errors or warnings in this structure.</p></ol>
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