Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / 7363fdec3d60ce2a051a6d363a95d0634002e6e7 / . / www / api / feature.html
blob: ed72a52bbf0f4044e9a21e0395218fba1993e05f [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"/>
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]12 <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]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"/>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]27 <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]28 <style type="text/css" media="all">
29 @import url("../../www/magick.css");
30 </style>
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]31 <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]32 <script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
33 <link rel="stylesheet" type="text/css" href="../fancybox/jquery.fancybox-1.3.4.css" media="screen" />
34 <script type="text/javascript">
35 $(document).ready(function() {
36 $("a[href$=.jpg],a[href$=.png],a[href$=.gif]").fancybox({
37 'transitionIn' : 'elastic',
38 'transitionOut' : 'elastic',
39 'overlayShow' : false,
40 'opacity' : true
41 });
42 });
43 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]44</head>
45
46<body id="www-imagemagick-org">
47<div class="titlebar">
48<a href="../../index.html">
49 <img src="../../images/script.png" alt="[ImageMagick]"
50 style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
51<a href="http://www.networkredux.com">
52 <img src="../../images/networkredux.png" alt="[sponsor]"
cristy52923442011-01-15 22:54:31 +0000[diff] [blame]53 style="margin-top: 42px; border: 0px; float: left;" /></a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]54<a href="http://www.imagemagick.org/discourse-server/">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]55 <img src="../../images/logo.jpg"
56 alt="ImageMagick Logo"
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]57 style="width: 123px; height: 118px; border: 0px; float: right;" /></a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]58<a href="../../index.html">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]59 <img src="../../images/sprite.jpg"
60 alt="ImageMagick Sprite"
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]61 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
62</div>
63
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]64<div class="westbar">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]65
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]66<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]67 <a title="About ImageMagick" href="../../index.html">About ImageMagick</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]68</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]69<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]70<div class="menu">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]71 <a title="Binary Releases" href="../../www/binary-releases.html">Binary Releases</a>
72</div>
73<div class="sub">
74 <a title="Binary Release: Unix" href="../../www/binary-releases.html#unix">Unix</a>
75</div>
76<div class="sub">
77 <a title="Binary Release: MacOS X" href="../../www/binary-releases.html#macosx">Mac OS X</a>
78</div>
79<div class="sub">
80 <a title="Binary Release: Windows" href="../../www/binary-releases.html#windows">Windows</a>
81</div>
82<div class="sep"></div>
83<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]84 <a title="Command-line Tools" href="../../www/command-line-tools.html">Command-line Tools</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: Processing" href="../../www/command-line-processing.html">Processing</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: Options" href="../../www/command-line-options.html">Options</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]91</div>
92<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]93 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]94</div>
95<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]96 <a title="Program Interfaces" href="../../www/api.html">Program Interfaces</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: MagickWand" href="../../www/magick-wand.html">MagickWand</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: MagickCore" href="../../www/magick-core.html">MagickCore</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]103</div>
104<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]105 <a title="Program Interface: PerlMagick" href="../../www/perl-magick.html">PerlMagick</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]106</div>
107<div class="sub">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]108 <a title="Program Interface: Magick++" href="../../www/magick++.html">Magick++</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]109</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]110<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]111<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]112 <a title="Install from Source" href="../../www/install-source.html">Install from Source</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: Unix" href="../../www/install-source.html#unix">Unix</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]116</div>
117<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]118 <a title="Install from Source: Windows" href="../../www/install-source.html#windows">Windows</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]119 </div>
120<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]121 <a title="Resources" href="../../www/resources.html">Resources</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]122</div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]123<div class="menu">
124 <a title="Architecture" href="../../www/architecture.html">Architecture</a>
125</div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]126<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]127 <a title="Download" href="../../www/download.html">Download</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]128</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]129<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]130<div class="menu">
cristy52923442011-01-15 22:54:31 +0000[diff] [blame]131 <a title="Search" href="../../www/search.html">Search</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">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]135 <a title="Site Map" href="../../www/sitemap.html">Site Map</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]136</div>
137<div class="sub">
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]138 <a title="Site Map: Links" href="../../www/links.html">Links</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]139</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]140<div class="sep"></div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]141<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]142 <a title="Sponsors" href="../../www/sponsors.html">Sponsors:</a>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]143
144<div class="sponsbox">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]145<div class="sponsor">
cristyaf8d6652011-02-04 21:57:45 +0000[diff] [blame]146 <a title="Sponsor: Best Web Hosting" href="http://webhostinggeeks.com">Best Web Hosting</a><!-- 201110010720 -->
147</div>
148<div class="sponsor">
149 <a title="Sponsor: Web Hosting Ratings" href="http://webhostingrating.com">Web Hosting Ratings</a><!-- 201110010720 -->
150</div>
151<div class="sponsor">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]152 <a title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201106010240 -->
153</div>
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]154<div class="sponsor">
cristy52923442011-01-15 22:54:31 +0000[diff] [blame]155 <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]156</div>
157<div class="sponsor">
cristyc5baf4f2010-08-31 15:05:33 +0000[diff] [blame]158 <a title="Sponsor: Image Converter" href="http://www.batchphoto.com">Image Converter</a><!-- 201103010900 Bits Coffee-->
159</div>
160<div class="sponsor">
cristy851dbce2010-08-06 21:40:00 +0000[diff] [blame]161 <a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
162</div>
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]163<div class="sponsor">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]164 <a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
165</div>
166<div class="sponsor">
cristya3c43262011-02-13 16:50:35 +0000[diff] [blame]167 <a title="Sponsor: alaTest.com" href="http://alatest.com">alaTest.com</a><!-- 20110801000300 -->
cristyec6b4752011-01-08 03:16:23 +0000[diff] [blame]168</div>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]169</div>
170</div>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]171</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]172
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]173<div class="eastbar">
174 <script type="text/javascript">
175 <!--
176 google_ad_client = "pub-3129977114552745";
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]177 google_ad_slot = "0574824969";
178 google_ad_width = 160;
179 google_ad_height = 600;
180 //-->
181 </script>
182 <script type="text/javascript"
183 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
184 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]185</div>
186
187<div class="main">
188
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]189<h1>Module feature
190 Methods</h1>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]191<p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
192
cristy70b59b62011-02-07 19:09:57 +0000[diff] [blame]193<h2><a href="http://www.imagemagick.org/api/MagickCore/feature
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]194_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]195<div class="doc-section">
196
197<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>
198
199<pre class="text">
cristy178edaf2011-01-23 03:42:39 +0000[diff] [blame]200 channel_features=GetImageChannelFeatures(image,1,exception);
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]201 contrast=channel_features[RedChannel].contrast[0];
202</pre>
203
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]204<p>Use MagickRelinquishMemory() to free the features buffer.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]205
206<p>The format of the GetImageChannelFeatures method is:</p>
207
208<pre class="code">
209 ChannelFeatures *GetImageChannelFeatures(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]210 const size_t distance,ExceptionInfo *exception)
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]211</pre>
212
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]213<p>A description of each parameter follows:</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]214
215<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]216<p>the image.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]217
218<h5>distance</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]219<p>the distance.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]220
221<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]222<p>return any errors or warnings in this structure.</p>
cristy3749be42010-02-02 02:46:51 +0000[diff] [blame]223
224 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]225
226</div>
227
228<div id="linkbar">
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]229 <span id="linkbar-west">&nbsp;</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]230 <span id="linkbar-center">
231 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]232 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]233 </span>
234 <span id="linkbar-east">&nbsp;</span>
235 </div>
236 <div class="footer">
cristy4103d562010-12-10 01:38:54 +0000[diff] [blame]237 <span id="footer-west">&copy; 1999-2011 ImageMagick Studio LLC</span>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]238 <span id="footer-east"> <a href="../http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
239 </div>
240 <div style="clear: both; margin: 0; width: 100%; "></div>
cristya8902942010-07-30 00:49:52 +0000[diff] [blame]241 <script type="text/javascript">
242 var _gaq = _gaq || [];
243 _gaq.push(['_setAccount', 'UA-17690367-1']);
244 _gaq.push(['_trackPageview']);
245
246 (function() {
247 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
248 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
249 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
250 })();
251 </script>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]252</body>
253</html>