Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / dcca3fa3bc535a40a90c681bf07f2379fc2f3f76 / . / www / api / feature.html
blob: 7d69b6c5e0db57d2ed402f97ff406fa799f90fa3 [file] [log] [blame]
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame^]1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
2 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" dir="ltr">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]4<head>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
6 <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U="/>
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]7 <title>ImageMagick: MagickCore, C API for ImageMagick: Image Features</title>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]8 <meta http-equiv="Content-Language" content="en-US"/>
9 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
10 <meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]11 <meta name="Application-name" content="ImageMagick"/>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame^]12 <meta name="Description" content="ImageMagick is a software suite to create, edit, compose, or convert bitmap images in a variety of formats. Use ImageMagick to scale, rotate, shear, distort and transform images."/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]13 <meta name="Application-url" content="http://www.imagemagick.org"/>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]14 <meta name="Generator" content="PHP"/>
15 <meta name="Keywords" content="magickcore, c, api, for, imagemagick:, image, features, ImageMagick, ImageMagic, MagickCore, MagickWand, PerlMagick, Magick++, RMagick, PythonMagick, JMagick, TclMagick, Image, Magick, Magic, Wand, ImageMagickObject, Swiss, Army, Knife, Image, Processing"/>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]16 <meta name="Rating" content="GENERAL"/>
17 <meta name="Robots" content="INDEX, FOLLOW"/>
18 <meta name="Generator" content="ImageMagick Studio LLC"/>
19 <meta name="Author" content="ImageMagick Studio LLC"/>
20 <meta name="Revisit-after" content="2 DAYS"/>
21 <meta name="Resource-type" content="document"/>
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]22 <meta name="Copyright" content="Copyright (c) 1999-2011 ImageMagick Studio LLC"/>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]23 <meta name="Distribution" content="Global"/>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame^]24 <link rel="icon" href="../../images/wand.png"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]25 <link rel="shortcut icon" href="../../images/wand.ico" type="images/x-icon"/>
26 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
27 <style type="text/css" media="all">
28 @import url("../../www/magick.css");
29 </style>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame^]30 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
31 <script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
32 <link rel="stylesheet" type="text/css" href="../fancybox/jquery.fancybox-1.3.4.css" media="screen" />
33 <script type="text/javascript">
34 $(document).ready(function() {
35 $("a[href$=.jpg],a[href$=.png],a[href$=.gif]").fancybox({
36 'transitionIn' : 'elastic',
37 'transitionOut' : 'elastic',
38 'overlayShow' : false,
39 'opacity' : true
40 });
41 });
42 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]43</head>
44
45<body id="www-imagemagick-org">
46<div class="titlebar">
47<a href="../../index.html">
48 <img src="../../images/script.png" alt="[ImageMagick]"
49 style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
50<a href="http://www.networkredux.com">
51 <img src="../../images/networkredux.png" alt="[sponsor]"
52 style="margin: 45px auto; border: 0px; float: left;" /></a>
53<a href="http://www.imagemagick.org/discourse-server/">
54 <img src="../../images/logo.jpg" alt=""
55 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
56<a href="../../index.html">
57 <img src="../../images/sprite.jpg" alt=""
58 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
59</div>
60
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]61<div class="westbar">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]62
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]63<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]64 <a title="About ImageMagick" href="../../index.html">About ImageMagick</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]65</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]66<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]67<div class="menu">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]68 <a title="Binary Releases" href="../../www/binary-releases.html">Binary Releases</a>
69</div>
70<div class="sub">
71 <a title="Binary Release: Unix" href="../../www/binary-releases.html#unix">Unix</a>
72</div>
73<div class="sub">
74 <a title="Binary Release: MacOS X" href="../../www/binary-releases.html#macosx">Mac OS X</a>
75</div>
76<div class="sub">
77 <a title="Binary Release: Windows" href="../../www/binary-releases.html#windows">Windows</a>
78</div>
79<div class="sep"></div>
80<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]81 <a title="Command-line Tools" href="../../www/command-line-tools.html">Command-line Tools</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]82</div>
83<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]84 <a title="Command-line Tools: Processing" href="../../www/command-line-processing.html">Processing</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]85</div>
86<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]87 <a title="Command-line Tools: Options" href="../../www/command-line-options.html">Options</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]88</div>
89<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]90 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]91</div>
92<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]93 <a title="Program Interfaces" href="../../www/api.html">Program Interfaces</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]94</div>
95<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]96 <a title="Program Interface: MagickWand" href="../../www/magick-wand.html">MagickWand</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]97</div>
98<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]99 <a title="Program Interface: MagickCore" href="../../www/magick-core.html">MagickCore</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]100</div>
101<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]102 <a title="Program Interface: PerlMagick" href="../../www/perl-magick.html">PerlMagick</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]103</div>
104<div class="sub">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame^]105 <a title="Program Interface: Magick++" href="../../www/magick++.html">Magick++</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]106</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]107<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]108<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]109 <a title="Install from Source" href="../../www/install-source.html">Install from Source</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]110</div>
111<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]112 <a title="Install from Source: Unix" href="../../www/install-source.html#unix">Unix</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]113</div>
114<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]115 <a title="Install from Source: Windows" href="../../www/install-source.html#windows">Windows</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]116 </div>
117<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]118 <a title="Resources" href="../../www/resources.html">Resources</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]119</div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]120<div class="menu">
121 <a title="Architecture" href="../../www/architecture.html">Architecture</a>
122</div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]123<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]124 <a title="Download" href="../../www/download.html">Download</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]125</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]126<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]127<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]128 <a title="Search" href="../http://www.imagemagick.org/script/search.php">Search</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]129</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]130<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]131<div class="menu">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]132 <a title="Site Map" href="../../www/sitemap.html">Site Map</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]133</div>
134<div class="sub">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]135 <a title="Site Map: Links" href="../../www/links.html">Links</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]136</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]137<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]138<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]139 <a title="Sponsors" href="../../www/sponsors.html">Sponsors:</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]140
141<div class="sponsbox">
142<div class="sponsor">
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]143 <a title="Sponsor: alaTest.com" href="http://alatest.com">alaTest.com</a><!-- 20110801000300 -->
cristy73fd1cd2010-09-12 19:14:25 +0000[diff] [blame]144</div>
145<div class="sponsor">
cristy7d52cd62010-10-01 17:26:59 +0000[diff] [blame]146 <a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
147</div>
148<div class="sponsor">
cristyc5baf4f2010-08-31 15:05:33 +0000[diff] [blame]149 <a title="Sponsor: Image Converter" href="http://www.batchphoto.com">Image Converter</a><!-- 201103010900 Bits Coffee-->
150</div>
151<div class="sponsor">
cristy851dbce2010-08-06 21:40:00 +0000[diff] [blame]152 <a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
153</div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]154</div>
155</div>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]156</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]157
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]158<div class="eastbar">
159 <script type="text/javascript">
160 <!--
161 google_ad_client = "pub-3129977114552745";
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]162 google_ad_slot = "0574824969";
163 google_ad_width = 160;
164 google_ad_height = 600;
165 //-->
166 </script>
167 <script type="text/javascript"
168 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
169 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]170</div>
171
172<div class="main">
173
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]174<h1>Module feature
175 Methods</h1>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]176<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
177
178<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
179_8c.html" target="source" name="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
180<div class="doc-section">
181
182<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>
183
184<pre class="text">
185 channel_features=GetImageChannelFeatures(image,1,excepton);
186 contrast=channel_features[RedChannel].contrast[0];
187</pre>
188
189<p>Use MagickRelinquishMemory() to free the features buffer.</p></ol>
190
191<p>The format of the GetImageChannelFeatures method is:</p>
192
193<pre class="code">
194 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]195 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]196</pre>
197
198<p>A description of each parameter follows:</p></ol>
199
200<h5>image</h5>
201<ol><p>the image.</p></ol>
202
203<h5>distance</h5>
204<ol><p>the distance.</p></ol>
205
206<h5>exception</h5>
207<ol><p>return any errors or warnings in this structure.</p></ol>
208
209 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]210
211</div>
212
213<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]214 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]215 <span id="linkbar-center">
216 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]217 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]218 </span>
219 <span id="linkbar-east">&nbsp;</span>
220 </div>
221 <div class="footer">
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]222 <span id="footer-west">&copy; 1999-2011 ImageMagick Studio LLC</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]223 <span id="footer-east"> <a href="../http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
224 </div>
225 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]226 <script type="text/javascript">
227 var _gaq = _gaq || [];
228 _gaq.push(['_setAccount', 'UA-17690367-1']);
229 _gaq.push(['_trackPageview']);
230
231 (function() {
232 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
233 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
234 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
235 })();
236 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]237</body>
238</html>