1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>segmentation: GStreamer Bad Plugins 1.0 Plugins Reference Manual</title> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="index.html" title="GStreamer Bad Plugins 1.0 Plugins Reference Manual"> 8<link rel="up" href="ch01.html" title="gst-plugins-bad Elements"> 9<link rel="prev" href="gst-plugins-bad-plugins-sdpsrc.html" title="sdpsrc"> 10<link rel="next" href="gst-plugins-bad-plugins-sfdec.html" title="sfdec"> 11<meta name="generator" content="GTK-Doc V1.28 (XML mode)"> 12<link rel="stylesheet" href="style.css" type="text/css"> 13</head> 14<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 15<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> 16<td width="100%" align="left" class="shortcuts"> 17<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 18 <a href="#gst-plugins-bad-plugins-segmentation.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 19 <a href="#gst-plugins-bad-plugins-segmentation.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties"> <span class="dim">|</span> 20 <a href="#gst-plugins-bad-plugins-segmentation.properties" class="shortcut">Properties</a></span> 21</td> 22<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> 23<td><a accesskey="u" href="ch01.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> 24<td><a accesskey="p" href="gst-plugins-bad-plugins-sdpsrc.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> 25<td><a accesskey="n" href="gst-plugins-bad-plugins-sfdec.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> 26</tr></table> 27<div class="refentry"> 28<a name="gst-plugins-bad-plugins-segmentation"></a><div class="titlepage"></div> 29<div class="refnamediv"><table width="100%"><tr> 30<td valign="top"> 31<h2><span class="refentrytitle"><a name="gst-plugins-bad-plugins-segmentation.top_of_page"></a>segmentation</span></h2> 32<p>segmentation</p> 33</td> 34<td class="gallery_image" valign="top" align="right"></td> 35</tr></table></div> 36<div class="refsect1"> 37<a name="gst-plugins-bad-plugins-segmentation.properties"></a><h2>Properties</h2> 38<div class="informaltable"><table class="informaltable" border="0"> 39<colgroup> 40<col width="150px" class="properties_type"> 41<col width="300px" class="properties_name"> 42<col width="200px" class="properties_flags"> 43</colgroup> 44<tbody> 45<tr> 46<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></td> 47<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-segmentation.html#GstSegmentation--learning-rate" title="The “learning-rate” property">learning-rate</a></td> 48<td class="property_flags">Read / Write</td> 49</tr> 50<tr> 51<td class="property_type"><span class="type">GstSegmentationMethod</span></td> 52<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-segmentation.html#GstSegmentation--method" title="The “method” property">method</a></td> 53<td class="property_flags">Read / Write</td> 54</tr> 55<tr> 56<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td> 57<td class="property_name"><a class="link" href="gst-plugins-bad-plugins-segmentation.html#GstSegmentation--test-mode" title="The “test-mode” property">test-mode</a></td> 58<td class="property_flags">Read / Write</td> 59</tr> 60</tbody> 61</table></div> 62</div> 63<a name="GstSegmentation"></a><div class="refsect1"> 64<a name="gst-plugins-bad-plugins-segmentation.other"></a><h2>Types and Values</h2> 65<div class="informaltable"><table class="informaltable" width="100%" border="0"> 66<colgroup> 67<col width="150px" class="name"> 68<col class="description"> 69</colgroup> 70<tbody><tr> 71<td class="datatype_keyword">struct</td> 72<td class="function_name"><a class="link" href="gst-plugins-bad-plugins-segmentation.html#GstSegmentation-struct" title="struct GstSegmentation">GstSegmentation</a></td> 73</tr></tbody> 74</table></div> 75</div> 76<div class="refsect1"> 77<a name="gst-plugins-bad-plugins-segmentation.object-hierarchy"></a><h2>Object Hierarchy</h2> 78<pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a> 79 <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a> 80 <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a> 81 <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a> 82 <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseTransform.html#GstBaseTransform-struct">GstBaseTransform</a> 83 <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gst-plugins-base-libs-1.0/GstVideoFilter.html#GstVideoFilter-struct">GstVideoFilter</a> 84 <span class="lineart">╰──</span> GstOpencvVideoFilter 85 <span class="lineart">╰──</span> GstSegmentation 86</pre> 87</div> 88<div class="refsect1"> 89<a name="gst-plugins-bad-plugins-segmentation.description"></a><h2>Description</h2> 90<p>This element creates and updates a fg/bg model using one of several approaches. 91The one called "codebook" refers to the codebook approach following the opencv 92O'Reilly book [1] implementation of the algorithm described in K. Kim, 93T. H. Chalidabhongse, D. Harwood and L. Davis [2]. BackgroundSubtractorMOG [3], 94or MOG for shorts, refers to a Gaussian Mixture-based Background/Foreground 95Segmentation Algorithm. OpenCV MOG implements the algorithm described in [4]. 96BackgroundSubtractorMOG2 [5], refers to another Gaussian Mixture-based 97Background/Foreground segmentation algorithm. OpenCV MOG2 implements the 98algorithm described in [6] and [7].</p> 99<p>[1] Learning OpenCV: Computer Vision with the OpenCV Library by Gary Bradski 100and Adrian Kaehler, Published by O'Reilly Media, October 3, 2008 101[2] "Real-time Foreground-Background Segmentation using Codebook Model", 102Real-time Imaging, Volume 11, Issue 3, Pages 167-256, June 2005. 103[3] http://opencv.itseez.com/modules/video/doc/motion_analysis_and_object_tracking.html<span class="type">backgroundsubtractormog</span> 104[4] P. KadewTraKuPong and R. Bowden, "An improved adaptive background 105mixture model for real-time tracking with shadow detection", Proc. 2nd 106European Workshop on Advanced Video-Based Surveillance Systems, 2001 107[5] http://opencv.itseez.com/modules/video/doc/motion_analysis_and_object_tracking.html<span class="type">backgroundsubtractormog2</span> 108[6] Z.Zivkovic, "Improved adaptive Gausian mixture model for background 109subtraction", International Conference Pattern Recognition, UK, August, 2004. 110[7] Z.Zivkovic, F. van der Heijden, "Efficient Adaptive Density Estimation 111per Image Pixel for the Task of Background Subtraction", Pattern Recognition 112Letters, vol. 27, no. 7, pages 773-780, 2006.</p> 113<div class="refsect2"> 114<a name="id-1.2.194.7.4"></a><h3>Example launch line</h3> 115<div class="informalexample"> 116 <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> 117 <tbody> 118 <tr> 119 <td class="listing_lines" align="right"><pre>1</pre></td> 120 <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> v4l2src device<span class="gtkdoc opt">=/</span>dev<span class="gtkdoc opt">/</span>video0 <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> segmentation test<span class="gtkdoc opt">-</span>mode<span class="gtkdoc opt">=</span><span class="keyword">true</span> method<span class="gtkdoc opt">=</span><span class="number">2</span> <span class="gtkdoc opt">!</span> videoconvert <span class="gtkdoc opt">!</span> ximagesink</pre></td> 121 </tr> 122 </tbody> 123 </table> 124</div> 125 126</div> 127<div class="refsynopsisdiv"> 128<h2>Synopsis</h2> 129<div class="refsect2"> 130<a name="id-1.2.194.7.5.1"></a><h3>Element Information</h3> 131<div class="variablelist"><table border="0" class="variablelist"> 132<colgroup> 133<col align="left" valign="top"> 134<col> 135</colgroup> 136<tbody> 137<tr> 138<td><p><span class="term">plugin</span></p></td> 139<td> 140 <a class="link" href="gst-plugins-bad-plugins-plugin-opencv.html#plugin-opencv">opencv</a> 141 </td> 142</tr> 143<tr> 144<td><p><span class="term">author</span></p></td> 145<td>Miguel Casas-Sanchez <miguelecasassanchez@gmail.com></td> 146</tr> 147<tr> 148<td><p><span class="term">class</span></p></td> 149<td>Filter/Effect/Video</td> 150</tr> 151</tbody> 152</table></div> 153</div> 154<hr> 155<div class="refsect2"> 156<a name="id-1.2.194.7.5.2"></a><h3>Element Pads</h3> 157<div class="variablelist"><table border="0" class="variablelist"> 158<colgroup> 159<col align="left" valign="top"> 160<col> 161</colgroup> 162<tbody> 163<tr> 164<td><p><span class="term">name</span></p></td> 165<td>sink</td> 166</tr> 167<tr> 168<td><p><span class="term">direction</span></p></td> 169<td>sink</td> 170</tr> 171<tr> 172<td><p><span class="term">presence</span></p></td> 173<td>always</td> 174</tr> 175<tr> 176<td><p><span class="term">details</span></p></td> 177<td>video/x-raw, format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> 178</tr> 179</tbody> 180</table></div> 181<div class="variablelist"><table border="0" class="variablelist"> 182<colgroup> 183<col align="left" valign="top"> 184<col> 185</colgroup> 186<tbody> 187<tr> 188<td><p><span class="term">name</span></p></td> 189<td>src</td> 190</tr> 191<tr> 192<td><p><span class="term">direction</span></p></td> 193<td>source</td> 194</tr> 195<tr> 196<td><p><span class="term">presence</span></p></td> 197<td>always</td> 198</tr> 199<tr> 200<td><p><span class="term">details</span></p></td> 201<td>video/x-raw, format=(string)RGBA, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> 202</tr> 203</tbody> 204</table></div> 205</div> 206</div> 207</div> 208<div class="refsect1"> 209<a name="gst-plugins-bad-plugins-segmentation.functions_details"></a><h2>Functions</h2> 210<p></p> 211</div> 212<div class="refsect1"> 213<a name="gst-plugins-bad-plugins-segmentation.other_details"></a><h2>Types and Values</h2> 214<div class="refsect2"> 215<a name="GstSegmentation-struct"></a><h3>struct GstSegmentation</h3> 216<pre class="programlisting">struct GstSegmentation;</pre> 217</div> 218</div> 219<div class="refsect1"> 220<a name="gst-plugins-bad-plugins-segmentation.property-details"></a><h2>Property Details</h2> 221<div class="refsect2"> 222<a name="GstSegmentation--learning-rate"></a><h3>The <code class="literal">“learning-rate”</code> property</h3> 223<pre class="programlisting"> “learning-rate” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a></pre> 224<p>Speed with which a motionless foreground pixel would become background (inverse of number of frames).</p> 225<p>Flags: Read / Write</p> 226<p>Allowed values: [0,1]</p> 227<p>Default value: 0.01</p> 228</div> 229<hr> 230<div class="refsect2"> 231<a name="GstSegmentation--method"></a><h3>The <code class="literal">“method”</code> property</h3> 232<pre class="programlisting"> “method” <span class="type">GstSegmentationMethod</span></pre> 233<p>Segmentation method to use.</p> 234<p>Flags: Read / Write</p> 235<p>Default value: Mixture-of-Gaussians segmentation (Zivkovic2004)</p> 236</div> 237<hr> 238<div class="refsect2"> 239<a name="GstSegmentation--test-mode"></a><h3>The <code class="literal">“test-mode”</code> property</h3> 240<pre class="programlisting"> “test-mode” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre> 241<p>If true, the output RGB is overwritten with the calculated foreground (white color).</p> 242<p>Flags: Read / Write</p> 243<p>Default value: FALSE</p> 244</div> 245</div> 246</div> 247<div class="footer"> 248<hr>Generated by GTK-Doc V1.28</div> 249</body> 250</html>
