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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]181<h1>Module feature
182 Methods</h1>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]183<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
184
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]185<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/feature
186_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]187<div class="doc-section">
188
189<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>
190
191<pre class="text">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame^]192 channel_features=GetImageChannelFeatures(image,1,exception);
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]193 contrast=channel_features[RedChannel].contrast[0];
194</pre>
195
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]196<p>Use MagickRelinquishMemory() to free the features buffer.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]197
198<p>The format of the GetImageChannelFeatures method is:</p>
199
200<pre class="code">
201 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]202 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]203</pre>
204
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]205<p>A description of each parameter follows:</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]206
207<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]208<p>the image.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]209
210<h5>distance</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]211<p>the distance.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]212
213<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]214<p>return any errors or warnings in this structure.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]215
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