1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from CV_CornerHarris.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="CV_CornerHarris" 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_CornerHarris</refname>
<refpurpose>Finds edges in image using Harris algorithm</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
edges = CV_CornerHarris(srcimg,blocksize,ksize,k,border_type)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>srcimg:</term>
<listitem><para> Input single-channel 8-bit or floating-point image.</para></listitem></varlistentry>
<varlistentry><term>blockSize:</term>
<listitem><para> Neighborhood size</para></listitem></varlistentry>
<varlistentry><term>ksize:</term>
<listitem><para> Aperture parameter for the Sobel() operator.</para></listitem></varlistentry>
<varlistentry><term>k:</term>
<listitem><para> Harris detector free parameter.</para></listitem></varlistentry>
<varlistentry><term>border_type:</term>
<listitem><para> border mode used to extrapolate pixels outside of the image.</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
The function runs the Harris edge detector on the image. For each pixel (x, y) it calculates a 2 * 2 gradient covariance matrix M(x,y) over a blockSize * blockSize neighborhood. Then, it computes the following characteristic: dst(x,y) = det(M(x,y)) - k .tr(M(x,y))^2. Corners in the image can be found as the local maxima of this response map.
</para>
<para>
border_type can be :
<itemizedlist>
<listitem>BORDER_REPLICATE: aaaaaa|abcdefgh|hhhhhhh</listitem>
<listitem>BORDER_REFLECT: fedcba|abcdefgh|hgfedcb</listitem>
<listitem>BORDER_REFLECT_101: gfedcb|abcdefgh|gfedcba</listitem>
<listitem>BORDER_WRAP: cdefgh|abcdefgh|abcdefg</listitem>
<listitem>BORDER_CONSTANT: iiiiii|abcdefgh|iiiiiii</listitem>
</itemizedlist>
</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_CornerHarris(dst,5,3,1,"BORDER_REPLICATE");
]]></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>
|
