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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from CV_Canny.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="CV_Canny" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:scilab="http://www.scilab.org"
xmlns:db="http://docbook.org/ns/docbook">
<refnamediv>
<refname>CV_Canny</refname>
<refpurpose>Finds edges in image using Canny algorithm</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
edges = CV_Canny(srcimg,threhold1,threshold2,aperture_size,L2gradient)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>srcimg :</term>
<listitem><para> single-channel 8-bit input image.</para></listitem></varlistentry>
<varlistentry><term>threshold1 :</term>
<listitem><para> first threshold for the hysteresis procedure.</para></listitem></varlistentry>
<varlistentry><term>threshold2 :</term>
<listitem><para> second threshold for the hysteresis procedure.</para></listitem></varlistentry>
<varlistentry><term>aperture_size :</term>
<listitem><para> aperture size for the Sobel() operator.</para></listitem></varlistentry>
<varlistentry><term>L2gradient :</term>
<listitem><para> a flag, indicating whether a more accurate</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This function can be used for finding edes in single channel 8 bit
image. 'aperture_size' and 'L2gradient' are optionals. By default,
aperture_size is 3 and L2gradient is false.
</para>
<para>
For L2gradient: L_2 norm =sqrt{(dI/dx)^2 + (dI/dy)^2} should be used to calculate the image gradient magnitude (L2gradient=1 ), or whether the default L_1 norm =|dI/dx|+|dI/dy| is enough (L2gradient=0).
</para>
<para>
This is curretly dummy function. It provides no functionality but is required
for providing support for generating C code for OpenCV
</para>
<para>
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
img = CV_LoadImage('~/test.jpg',0)
dst = CV_CvtColor(img,"CV_RGB2GRAY");
edge = CV_Canny(dst,50,100,3,0);
]]></programlisting>
</refsection>
<refsection>
<title>See also</title>
<simplelist type="inline">
<member><link linkend="CV_LoadImage">CV_CvtColor</link></member>
</simplelist>
</refsection>
<refsection>
<title>Authors</title>
<simplelist type="vert">
<member>Siddhesh Wani</member>
</simplelist>
</refsection>
</refentry>
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