Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / 350dea44cca73cc46ce2183e1851c5b254c7921e / . / www / api / feature.html
blob: b53f77cb01d63497aa95d238283d542872cdc401 [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">
cristy2bd2a982011-02-15 00:52:58 +0000[diff] [blame]3<html version="-//W3C//DTD XHTML 1.1//EN"
4 xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
6 xsi:schemaLocation="http://www.w3.org/1999/xhtml
7 http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]8<head>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]9 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
10 <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U="/>
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]11 <title>ImageMagick: MagickCore, C API for ImageMagick: Image Features</title>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]12 <meta http-equiv="Content-Language" content="en-US"/>
13 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
14 <meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]15 <meta name="Application-name" content="ImageMagick"/>
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]16 <meta name="Description" content="Use ImageMagick to convert, edit, or compose bitmap images in a variety of formats. In addition resize, rotate, shear, distort and transform images."/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]17 <meta name="Application-url" content="http://www.imagemagick.org"/>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]18 <meta name="Generator" content="PHP"/>
19 <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]20 <meta name="Rating" content="GENERAL"/>
21 <meta name="Robots" content="INDEX, FOLLOW"/>
22 <meta name="Generator" content="ImageMagick Studio LLC"/>
23 <meta name="Author" content="ImageMagick Studio LLC"/>
24 <meta name="Revisit-after" content="2 DAYS"/>
25 <meta name="Resource-type" content="document"/>
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]26 <meta name="Copyright" content="Copyright (c) 1999-2011 ImageMagick Studio LLC"/>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]27 <meta name="Distribution" content="Global"/>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]28 <link rel="icon" href="../../images/wand.png"/>
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]29 <link rel="shortcut icon" href="../../images/wand.ico" type="images/x-icon"/>
30 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]31 <link rel="stylesheet" href="http://www.google.com/cse/style/look/default.css" type="text/css" />
cristy3c98a4f2010-08-13 20:09:41 +0000[diff] [blame]32 <style type="text/css" media="all">
33 @import url("../../www/magick.css");
34 </style>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]35 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
cristy361f4662010-12-31 23:02:52 +0000[diff] [blame]36 <script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
37 <link rel="stylesheet" type="text/css" href="../fancybox/jquery.fancybox-1.3.4.css" media="screen" />
38 <script type="text/javascript">
39 $(document).ready(function() {
40 $("a[href$=.jpg],a[href$=.png],a[href$=.gif]").fancybox({
41 'transitionIn' : 'elastic',
42 'transitionOut' : 'elastic',
43 'overlayShow' : false,
44 'opacity' : true
45 });
46 });
47 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]48</head>
49
50<body id="www-imagemagick-org">
51<div class="titlebar">
52<a href="../../index.html">
53 <img src="../../images/script.png" alt="[ImageMagick]"
54 style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
55<a href="http://www.networkredux.com">
56 <img src="../../images/networkredux.png" alt="[sponsor]"
cristy52923442011-01-15 22:54:31 +0000[diff] [blame]57 style="margin-top: 42px; border: 0px; float: left;" /></a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]58<a href="http://www.imagemagick.org/discourse-server/">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]59 <img src="../../images/logo.jpg"
60 alt="ImageMagick Logo"
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]61 style="width: 123px; height: 118px; border: 0px; float: right;" /></a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]62<a href="../../index.html">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]63 <img src="../../images/sprite.jpg"
64 alt="ImageMagick Sprite"
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]65 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
66</div>
67
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]68<div class="westbar">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]69
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]70<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]71 <a title="About ImageMagick" href="../../index.html">About ImageMagick</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]72</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]73<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]74<div class="menu">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]75 <a title="Binary Releases" href="../../www/binary-releases.html">Binary Releases</a>
76</div>
77<div class="sub">
78 <a title="Binary Release: Unix" href="../../www/binary-releases.html#unix">Unix</a>
79</div>
80<div class="sub">
81 <a title="Binary Release: MacOS X" href="../../www/binary-releases.html#macosx">Mac OS X</a>
82</div>
83<div class="sub">
84 <a title="Binary Release: Windows" href="../../www/binary-releases.html#windows">Windows</a>
85</div>
86<div class="sep"></div>
87<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]88 <a title="Command-line Tools" href="../../www/command-line-tools.html">Command-line Tools</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]89</div>
90<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]91 <a title="Command-line Tools: Processing" href="../../www/command-line-processing.html">Processing</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]92</div>
93<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]94 <a title="Command-line Tools: Options" href="../../www/command-line-options.html">Options</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]95</div>
96<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]97 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]98</div>
99<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]100 <a title="Program Interfaces" href="../../www/api.html">Program Interfaces</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]101</div>
102<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]103 <a title="Program Interface: MagickWand" href="../../www/magick-wand.html">MagickWand</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]104</div>
105<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]106 <a title="Program Interface: MagickCore" href="../../www/magick-core.html">MagickCore</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]107</div>
108<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]109 <a title="Program Interface: PerlMagick" href="../../www/perl-magick.html">PerlMagick</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]110</div>
111<div class="sub">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]112 <a title="Program Interface: Magick++" href="../../www/magick++.html">Magick++</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]113</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]114<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]115<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]116 <a title="Install from Source" href="../../www/install-source.html">Install from Source</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]117</div>
118<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]119 <a title="Install from Source: Unix" href="../../www/install-source.html#unix">Unix</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]120</div>
121<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]122 <a title="Install from Source: Windows" href="../../www/install-source.html#windows">Windows</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]123 </div>
124<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]125 <a title="Resources" href="../../www/resources.html">Resources</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]126</div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]127<div class="menu">
128 <a title="Architecture" href="../../www/architecture.html">Architecture</a>
129</div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]130<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]131 <a title="Download" href="../../www/download.html">Download</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]132</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]133<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]134<div class="menu">
cristy52923442011-01-15 22:54:31 +0000[diff] [blame]135 <a title="Search" href="../../www/search.html">Search</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">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]139 <a title="Site Map" href="../../www/sitemap.html">Site Map</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]140</div>
141<div class="sub">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]142 <a title="Site Map: Links" href="../../www/links.html">Links</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]143</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]144<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]145<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]146 <a title="Sponsors" href="../../www/sponsors.html">Sponsors:</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]147
148<div class="sponsbox">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]149<div class="sponsor">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]150 <a title="Sponsor: Best Web Hosting" href="http://webhostinggeeks.com">Best Web Hosting</a><!-- 201110010720 -->
151</div>
152<div class="sponsor">
153 <a title="Sponsor: Web Hosting Ratings" href="http://webhostingrating.com">Web Hosting Ratings</a><!-- 201110010720 -->
154</div>
155<div class="sponsor">
cristy2bd2a982011-02-15 00:52:58 +0000[diff] [blame]156 <a title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201107010240 r.leo -->
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]157</div>
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]158<div class="sponsor">
cristy52923442011-01-15 22:54:31 +0000[diff] [blame]159 <a title="Sponsor: Web Hosting" href="http://www.bodhost.com/hosting.shtml">Web Hosting</a><!-- 201104010090 -->
cristy73fd1cd2010-09-12 19:14:25 +0000[diff] [blame]160</div>
161<div class="sponsor">
cristyc5baf4f2010-08-31 15:05:33 +0000[diff] [blame]162 <a title="Sponsor: Image Converter" href="http://www.batchphoto.com">Image Converter</a><!-- 201103010900 Bits Coffee-->
163</div>
164<div class="sponsor">
cristy851dbce2010-08-06 21:40:00 +0000[diff] [blame]165 <a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
166</div>
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]167<div class="sponsor">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]168 <a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
169</div>
170<div class="sponsor">
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]171 <a title="Sponsor: Fernsehdienst Berlin" href="http://www.atlas-multimedia.de">Fernsehdienst Berlin</a><!-- 2011050100025 atlas.multimedia-->
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]172</div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]173</div>
174</div>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]175</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]176
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]177<div class="eastbar">
178 <script type="text/javascript">
179 <!--
180 google_ad_client = "pub-3129977114552745";
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]181 google_ad_slot = "0574824969";
182 google_ad_width = 160;
183 google_ad_height = 600;
184 //-->
185 </script>
186 <script type="text/javascript"
187 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
188 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]189</div>
190
191<div class="main">
192
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]193<h1>Module feature Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]194<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]196<h2><a href="http://www.imagemagick.org/api/MagickCore/feature_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<div class="doc-section">
198
199<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>
200
201<pre class="text">
202 channel_features=GetImageChannelFeatures(image,1,exception);
203 contrast=channel_features[RedChannel].contrast[0];
204</pre>
205
206<p>Use MagickRelinquishMemory() to free the features buffer.</p>
207
208<p>The format of the GetImageChannelFeatures method is:</p>
209
210<pre class="code">
211 ChannelFeatures *GetImageChannelFeatures(const Image *image,
212 const size_t distance,ExceptionInfo *exception)
213</pre>
214
215<p>A description of each parameter follows:</p>
216
217<h5>image</h5>
218<p>the image.</p>
219
220<h5>distance</h5>
221<p>the distance.</p>
222
223<h5>exception</h5>
224<p>return any errors or warnings in this structure.</p>
225
226 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]227
228</div>
229
230<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]231 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]232 <span id="linkbar-center">
233 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]234 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]235 </span>
236 <span id="linkbar-east">&nbsp;</span>
237 </div>
238 <div class="footer">
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]239 <span id="footer-west">&copy; 1999-2011 ImageMagick Studio LLC</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]240 <span id="footer-east"> <a href="../http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
241 </div>
242 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]243 <script type="text/javascript">
244 var _gaq = _gaq || [];
245 _gaq.push(['_setAccount', 'UA-17690367-1']);
246 _gaq.push(['_trackPageview']);
247
248 (function() {
249 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
250 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
251 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
252 })();
253 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]254</body>
255</html>