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192
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]193<h1>Module feature
194 Methods</h1>
195<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]196
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]197<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
198_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
199<div class="doc-section">
200
201<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>
202
203<pre class="text">
204 channel_features=GetImageChannelFeatures(image,1,exception);
205 contrast=channel_features[RedChannel].contrast[0];
206</pre>
207
208<p>Use MagickRelinquishMemory() to free the features buffer.</p>
209
210<p>The format of the GetImageChannelFeatures method is:</p>
211
212<pre class="code">
213 ChannelFeatures *GetImageChannelFeatures(const Image *image,
214 const size_t distance,ExceptionInfo *exception)
215</pre>
216
217<p>A description of each parameter follows:</p>
218
219<h5>image</h5>
220<p>the image.</p>
221
222<h5>distance</h5>
223<p>the distance.</p>
224
225<h5>exception</h5>
226<p>return any errors or warnings in this structure.</p>
227
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