1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
\r
2 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
\r
3 <html version="-//W3C//DTD XHTML 1.1//EN"
\r
4 xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
\r
5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
\r
6 xsi:schemaLocation="http://www.w3.org/1999/xhtml
\r
7 http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd">
\r
9 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
\r
10 <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U="/>
\r
11 <title>ImageMagick: MagickCore, C API for ImageMagick: Image Features</title>
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"/>
15 <meta name="Application-name" content="ImageMagick"/>
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."/>
17 <meta name="Application-url" content="http://www.imagemagick.org"/>
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"/>
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"/>
26 <meta name="Copyright" content="Copyright (c) 1999-2011 ImageMagick Studio LLC"/>
27 <meta name="Distribution" content="Global"/>
28 <link rel="icon" href="../../images/wand.png"/>
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"/>
\r
31 <link rel="stylesheet" href="http://www.google.com/cse/style/look/default.css" type="text/css" />
\r
32 <style type="text/css" media="all">
\r
33 @import url("../../www/magick.css");
\r
35 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
\r
36 <script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
\r
37 <link rel="stylesheet" type="text/css" href="../fancybox/jquery.fancybox-1.3.4.css" media="screen" />
\r
38 <script type="text/javascript">
\r
39 $(document).ready(function() {
\r
40 $("a[href$=.jpg],a[href$=.png],a[href$=.gif]").fancybox({
\r
41 'transitionIn' : 'elastic',
\r
42 'transitionOut' : 'elastic',
\r
43 'overlayShow' : false,
\r
50 <body id="www-imagemagick-org">
\r
51 <div class="titlebar">
\r
52 <div style="margin: 17px auto; float: left;">
\r
53 <script type="text/javascript">
\r
55 google_ad_client = "pub-3129977114552745";
\r
56 google_ad_slot = "5439289906";
\r
57 google_ad_width = 728;
\r
58 google_ad_height = 90;
\r
61 <script type="text/javascript"
\r
62 src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
\r
65 <a href="http://www.imagemagick.org/discourse-server/">
\r
66 <img src="../../images/logo.jpg"
\r
67 alt="ImageMagick Logo"
\r
68 style="width: 123px; height: 118px; border: 0px; float: right;" /></a>
\r
69 <a href="../../index.html">
\r
70 <img src="../../images/sprite.jpg"
\r
71 alt="ImageMagick Sprite"
\r
72 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
\r
75 <div class="westbar">
\r
78 <a title="About ImageMagick" href="../../index.html">About ImageMagick</a>
80 <div class="sep"></div>
\r
82 <a title="Binary Releases" href="../../www/binary-releases.html">Binary Releases</a>
85 <a title="Binary Release: Unix" href="../../www/binary-releases.html#unix">Unix</a>
88 <a title="Binary Release: MacOS X" href="../../www/binary-releases.html#macosx">Mac OS X</a>
91 <a title="Binary Release: iPhone" href="../../www/binary-releases.html#iPhone">iPhone</a>
94 <a title="Binary Release: Windows" href="../../www/binary-releases.html#windows">Windows</a>
96 <div class="sep"></div>
\r
98 <a title="Command-line Tools" href="../../www/command-line-tools.html">Command-line Tools</a>
101 <a title="Command-line Tools: Processing" href="../../www/command-line-processing.html">Processing</a>
104 <a title="Command-line Tools: Options" href="../../www/command-line-options.html">Options</a>
107 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
110 <a title="Program Interfaces" href="../../www/api.html">Program Interfaces</a>
113 <a title="Program Interface: MagickWand" href="../../www/magick-wand.html">MagickWand</a>
116 <a title="Program Interface: MagickCore" href="../../www/magick-core.html">MagickCore</a>
119 <a title="Program Interface: PerlMagick" href="../../www/perl-magick.html">PerlMagick</a>
122 <a title="Program Interface: Magick++" href="../../www/magick++.html">Magick++</a>
124 <div class="sep"></div>
\r
126 <a title="Install from Source" href="../../www/install-source.html">Install from Source</a>
129 <a title="Install from Source: Unix" href="../../www/install-source.html#unix">Unix</a>
132 <a title="Install from Source: Windows" href="../../www/install-source.html#windows">Windows</a>
135 <a title="Resources" href="../../www/resources.html">Resources</a>
138 <a title="Architecture" href="../../www/architecture.html">Architecture</a>
141 <a title="Download" href="../../www/download.html">Download</a>
143 <div class="sep"></div>
\r
145 <a title="Search" href="../../www/search.html">Search</a>
147 <div class="sep"></div>
\r
149 <a title="Site Map" href="../../www/sitemap.html">Site Map</a>
152 <a title="Site Map: Links" href="../../www/links.html">Links</a>
154 <div class="sep"></div>
\r
156 <a title="Sponsors" href="../../www/sponsors.html">Sponsors:</a>
158 <a href="http://www.networkredux.com">
159 <img src="../../images/networkredux.png" alt="[sponsor]"
160 style="margin-top: 4px; margin-left: 4px; border: 0px; float: left;" /></a>
161 <div class="sponsbox">
162 <div class="sponsor">
163 <a title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201303011500 r.leo -->
165 <div class="sponsor">
166 <a title="Sponsor: Hotel München" href="http://www.messehotel-erb-muenchen.de">Hotel München</a><!-- 201111010450 cerb -->
168 <div class="sponsor">
169 <a title="Sponsor: Website Hosting" href="http://www.hostreviewgeeks.com">Website Hosting</a><!-- 201106010090 alexanian media -->
171 <div class="sponsor">
172 <a title="Sponsor: Best Web Hosting" href="http://webhostinggeeks.com">Best Web Hosting</a><!-- 201110010720 -->
174 <div class="sponsor">
175 <a title="Sponsor: Web Hosting Ratings" href="http://webhostingrating.com">Web Hosting Ratings</a><!-- 201110010720 -->
177 <div class="sponsor">
178 <a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
180 <div class="sponsor">
181 <a title="Sponsor: Web Hosting" href="http://www.bodhost.com/hosting.shtml">Web Hosting</a><!-- 201104010090 -->
183 <div class="sponsor">
184 <a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
186 <div class="sponsor">
187 <a title="Sponsor: Webdesign" href="http://www.renehornig.com/">Webdesign</a><!-- 20111001000240 -->
193 <div class="eastbar">
\r
199 <h1>Module feature Methods</h1>
200 <p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
202 <h2><a href="http://www.imagemagick.org/api/MagickCore/feature_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
203 <div class="doc-section">
205 <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>
208 channel_features=GetImageChannelFeatures(image,1,exception);
209 contrast=channel_features[RedChannel].contrast[0];
212 <p>Use MagickRelinquishMemory() to free the features buffer.</p>
214 <p>The format of the GetImageChannelFeatures method is:</p>
217 ChannelFeatures *GetImageChannelFeatures(const Image *image,
218 const size_t distance,ExceptionInfo *exception)
221 <p>A description of each parameter follows:</p>
230 <p>return any errors or warnings in this structure.</p>
237 <span id="linkbar-west"> </span>
\r
238 <span id="linkbar-center">
\r
239 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> •
\r
240 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
\r
242 <span id="linkbar-east"> </span>
\r
244 <div class="footer">
\r
245 <span id="footer-west">© 1999-2011 ImageMagick Studio LLC</span>
\r
246 <span id="footer-east"> <a href="../http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
\r
248 <div style="clear: both; margin: 0; width: 100%; "></div>
\r
249 <script type="text/javascript">
\r
250 var _gaq = _gaq || [];
\r
251 _gaq.push(['_setAccount', 'UA-17690367-1']);
\r
252 _gaq.push(['_trackPageview']);
\r
255 var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
\r
256 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
\r
257 var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
\r