granicus.if.org Git - imagemagick/blob - www/api/feature.html

   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
   8 <head>\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
  34   </style>\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
  44         'opacity'       : true\r
  45       });\r
  46     });\r
  47   </script>\r
  48 </head>\r
  49 \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
  54   <!--\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
  59   //-->\r
  60   </script>\r
  61   <script type="text/javascript"\r
  62     src="http://pagead2.googlesyndication.com/pagead/show_ads.js">\r
  63   </script>\r
  64 </div>\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
  73 </div>\r
  74 \r
  75 <div class="westbar">\r
  76 \r
  77 <div class="menu">
  78   <a title="About ImageMagick" href="../../index.html">About ImageMagick</a>
  79 </div>
  80 <div class="sep"></div>\r
  81 <div class="menu">
  82   <a title="Binary Releases" href="../../www/binary-releases.html">Binary Releases</a>
  83 </div>
  84 <div class="sub">
  85     <a title="Binary Release: Unix" href="../../www/binary-releases.html#unix">Unix</a>
  86 </div>
  87 <div class="sub">
  88     <a title="Binary Release: MacOS X" href="../../www/binary-releases.html#macosx">Mac OS X</a>
  89 </div>
  90 <div class="sub">
  91     <a title="Binary Release: iPhone" href="../../www/binary-releases.html#iPhone">iPhone</a>
  92 </div>
  93 <div class="sub">
  94     <a title="Binary Release: Windows" href="../../www/binary-releases.html#windows">Windows</a>
  95 </div>
  96 <div class="sep"></div>\r
  97 <div class="menu">
  98   <a title="Command-line Tools" href="../../www/command-line-tools.html">Command-line Tools</a>
  99 </div>
 100 <div class="sub">
 101     <a title="Command-line Tools: Processing" href="../../www/command-line-processing.html">Processing</a>
 102 </div>
 103 <div class="sub">
 104     <a title="Command-line Tools: Options" href="../../www/command-line-options.html">Options</a>
 105 </div>
 106 <div class="sub">
 107     <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
 108 </div>
 109 <div class="menu">
 110   <a title="Program Interfaces" href="../../www/api.html">Program Interfaces</a>
 111 </div>
 112 <div class="sub">
 113     <a title="Program Interface: MagickWand" href="../../www/magick-wand.html">MagickWand</a>
 114 </div>
 115 <div class="sub">
 116     <a title="Program Interface: MagickCore" href="../../www/magick-core.html">MagickCore</a>
 117 </div>
 118 <div class="sub">
 119     <a title="Program Interface: PerlMagick" href="../../www/perl-magick.html">PerlMagick</a>
 120 </div>
 121 <div class="sub">
 122     <a title="Program Interface: Magick++" href="../../www/magick++.html">Magick++</a>
 123 </div>
 124 <div class="sep"></div>\r
 125 <div  class="menu">
 126    <a title="Install from Source" href="../../www/install-source.html">Install from Source</a>
 127 </div>
 128 <div class="sub">
 129     <a title="Install from Source: Unix" href="../../www/install-source.html#unix">Unix</a>
 130 </div>
 131 <div class="sub">
 132     <a title="Install from Source: Windows" href="../../www/install-source.html#windows">Windows</a>
 133  </div>
 134 <div class="menu">
 135   <a title="Resources" href="../../www/resources.html">Resources</a>
 136 </div>
 137 <div class="menu">
 138   <a title="Architecture" href="../../www/architecture.html">Architecture</a>
 139 </div>
 140 <div class="menu">
 141   <a title="Download" href="../../www/download.html">Download</a>
 142 </div>
 143 <div class="sep"></div>\r
 144 <div class="menu">
 145   <a title="Search" href="../../www/search.html">Search</a>
 146 </div>
 147 <div class="sep"></div>\r
 148 <div class="menu">
 149   <a title="Site Map" href="../../www/sitemap.html">Site Map</a>
 150 </div>
 151 <div  class="sub">
 152   <a title="Site Map: Links" href="../../www/links.html">Links</a>
 153 </div>
 154 <div class="sep"></div>\r
 155 <div  class="menu">
 156   <a title="Sponsors" href="../../www/sponsors.html">Sponsors:</a>
 157
 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: Web Hosting Reviews" href="http://www.webhostingmasters.com">Web Hosting Reviews</a><!-- 201107011500 affliatelabel -->
 164 </div>
 165 <div  class="sponsor">
 166   <a title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201303011500 r.leo -->
 167 </div>
 168 <div  class="sponsor">
 169   <a title="Sponsor: Hotel München" href="http://www.messehotel-erb-muenchen.de">Hotel München</a><!-- 201111010450 cerb -->
 170 </div>
 171 <div  class="sponsor">
 172   <a title="Sponsor: Website Hosting" href="http://www.hostreviewgeeks.com">Website Hosting</a><!-- 201107010090 alexanian media -->
 173 </div>
 174 <div  class="sponsor">
 175   <a title="Sponsor: Best Web Hosting" href="http://webhostinggeeks.com">Best Web Hosting</a><!-- 201110010720 -->
 176 </div>
 177 <div  class="sponsor">
 178   <a title="Sponsor: Web Hosting Ratings" href="http://webhostingrating.com">Web Hosting Ratings</a><!-- 201110010720 -->
 179 </div>
 180 <div  class="sponsor">
 181   <a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
 182 </div>
 183 <div  class="sponsor">
 184   <a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
 185 </div>
 186 <div  class="sponsor">
 187    <a title="Sponsor: Fernsehdienst Berlin" href="http://www.atlas-multimedia.de">Fernsehdienst Berlin</a><!-- 2011080100025 atlas.multimedia-->
 188 </div>
 189 </div>
 190 </div>
 191 </div>\r
 192 \r
 193 <div class="eastbar">\r
 194 \r
 195 </div>\r
 196 \r
 197 <div class="main">\r
 198 \r
 199 <h1>Module feature Methods</h1>
 200 <p class="navigation-index">[<a href="#GetImageChannelFeatures">GetImageChannelFeatures</a>]</p>
 201
 202 <h2><a href="http://www.imagemagick.org/api/MagickCore/feature_8c.html" id="GetImageChannelFeatures">GetImageChannelFeatures</a></h2>
 203 <div class="doc-section">
 204
 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>
 206
 207 <pre class="text">
 208   channel_features=GetImageChannelFeatures(image,1,exception);
 209   contrast=channel_features[RedChannel].contrast[0];
 210 </pre>
 211
 212 <p>Use MagickRelinquishMemory() to free the features buffer.</p>
 213
 214 <p>The format of the GetImageChannelFeatures method is:</p>
 215
 216 <pre class="code">
 217   ChannelFeatures *GetImageChannelFeatures(const Image *image,
 218     const size_t distance,ExceptionInfo *exception)
 219 </pre>
 220
 221 <p>A description of each parameter follows:</p>
 222
 223 <h5>image</h5>
 224 <p>the image.</p>
 225
 226 <h5>distance</h5>
 227 <p>the distance.</p>
 228
 229 <h5>exception</h5>
 230 <p>return any errors or warnings in this structure.</p>
 231
 232  </div>
 233 \r
 234 </div>\r
 235 \r
 236 <div id="linkbar">\r
 237     <span id="linkbar-west">&nbsp;</span>\r
 238     <span id="linkbar-center">\r
 239       <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;\r
 240       <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>\r
 241     </span>\r
 242     <span id="linkbar-east">&nbsp;</span>\r
 243   </div>\r
 244   <div class="footer">\r
 245     <span id="footer-west">&copy; 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
 247   </div>\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
 253 \r
 254     (function() {\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
 258     })();\r
 259   </script>\r
 260 </body>\r
 261 </html>\r