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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"><html><head> <title>Description of gfdemo02</title> <meta name="keywords" content="gfdemo02"> <meta name="description" content="GFDEMO02 Demonstrate 2-D Gabor functionality"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="m2html © 2003 Guillaume Flandin"> <meta name="robots" content="index, follow"> <link type="text/css" rel="stylesheet" href="../m2html.css"></head><body><a name="_top"></a><div><a href="../index.html">Home</a> > <a href="index.html">gabortb-v0.4.1</a> > gfdemo02.m</div><!--<table width="100%"><tr><td align="left"><a href="../index.html"><img alt="<" border="0" src="../left.png"> Master index</a></td><td align="right"><a href="index.html">Index for gabortb-v0.4.1 <img alt=">" border="0" src="../right.png"></a></td></tr></table>--><h1>gfdemo02</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>GFDEMO02 Demonstrate 2-D Gabor functionality</strong></div><h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>function [] = gfdemo02; </strong></div><h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre class="comment"> GFDEMO02 Demonstrate 2-D Gabor functionality
References:
[1] Kamarainen, J.-K., Kyrki, V., Kalviainen, H., Gabor
Features for Invariant Object Recognition, Research
report 78, Department of Information Technology,
Lappeenranta University of Technology
Author(s):
Joni Kamarainen <Joni.Kamarainen@lut.fi>
Ville Kyrki <Ville.Kyrki@lut.fi>
Copyright:
The Gabor Features in Signal and Image Processing Toolbox is
Copyright (C) 2000 by Joni Kamarainen and Ville Kyrki.
$Name: $ $Revision: 1.1 $ $Date: 2003-12-23 07:27:55 $</pre></div><!-- crossreference --><h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>This function calls:<ul style="list-style-image:url(../matlabicon.gif)"><li><a href="gfcreatefilter2.html" class="code" title="function [g]=gfcreatefilter2(f0,theta,gamma,eta,n,varargin)">gfcreatefilter2</a> GFCREATEFILTER2 Create normalized 2-D Gabor filter in the spatial domain.</li><li><a href="gfcreatefilterf2.html" class="code" title="function [g]=gfcreatefilterf2(f0, theta, gamma, eta, N,varargin)">gfcreatefilterf2</a> GFCREATEFILTERF2 Create normalized 2-D Gabor filter in the frequency domain.</li><li><a href="gfrespf2.html" class="code" title="function [r]=gfrespf2(gf_, s_, varargin);">gfrespf2</a> GFRESPF2 2-D filter response using frequency domain filters.</li></ul>This function is called by:<ul style="list-style-image:url(../matlabicon.gif)"></ul><!-- crossreference --><h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre>0001 <span class="comment">% GFDEMO02 Demonstrate 2-D Gabor functionality</span>0002 <span class="comment">%</span>0003 <span class="comment">% References:</span>0004 <span class="comment">% [1] Kamarainen, J.-K., Kyrki, V., Kalviainen, H., Gabor</span>0005 <span class="comment">% Features for Invariant Object Recognition, Research</span>0006 <span class="comment">% report 78, Department of Information Technology,</span>0007 <span class="comment">% Lappeenranta University of Technology</span>0008 <span class="comment">%</span>0009 <span class="comment">% Author(s):</span>0010 <span class="comment">% Joni Kamarainen <Joni.Kamarainen@lut.fi></span>0011 <span class="comment">% Ville Kyrki <Ville.Kyrki@lut.fi></span>0012 <span class="comment">%</span>0013 <span class="comment">% Copyright:</span>0014 <span class="comment">%</span>0015 <span class="comment">% The Gabor Features in Signal and Image Processing Toolbox is</span>0016 <span class="comment">% Copyright (C) 2000 by Joni Kamarainen and Ville Kyrki.</span>0017 <span class="comment">%</span>0018 <span class="comment">%</span>0019 <span class="comment">% $Name: $ $Revision: 1.1 $ $Date: 2003-12-23 07:27:55 $</span>0020 <span class="comment">%</span>0021 <a name="_sub0" href="#_subfunctions" class="code">function [] = gfdemo02;</a>0022 0023 disp(<span class="string">'Step 1: GENERATE TEST IMAGE'</span>);0024 img = 0.1*randn(128,128);0025 img(50:60,50:60) = 1;0026 imagesc(img);0027 colormap(gray);0028 input(<span class="string">'<RETURN>'</span>);0029 0030 <span class="comment">% create 1-D spatial Gabor filter</span>0031 disp(<span class="string">'Step 2: FILTER WITH 2D TIME DOMAIN GABOR FILTER'</span>);0032 f = 0.2;0033 theta = 0;0034 gamma = 1;0035 eta = 1;0036 g = <a href="gfcreatefilter2.html" class="code" title="function [g]=gfcreatefilter2(f0,theta,gamma,eta,n,varargin)">gfcreatefilter2</a>(f,theta,gamma,eta,[62 62]);0037 disp(<span class="string">'Real part of the filter'</span>);0038 imagesc(real(g));0039 colormap(gray);0040 input(<span class="string">'<RETURN>'</span>);0041 0042 <span class="comment">% filter signal with given filter and plot magnitude</span>0043 disp(<span class="string">'If the image i(x,y) and filter g(x,y) are now convolved conv(g,x)'</span>);0044 disp(<span class="string">'we can calculate the magnitudes of the filter response.'</span>);0045 resp1 = conv2(g,img,<span class="string">'same'</span>);0046 imagesc(abs(resp1).^2);0047 colormap(gray);0048 colorbar;0049 input(<span class="string">'<RETURN>'</span>);0050 0051 <span class="comment">% convert signal to Fourier domain</span>0052 disp(<span class="string">'Step 3: FILTER WITH 2D FREQUENCY DOMAIN GABOR FILTER'</span>);0053 disp(<span class="string">'For faster computation we can transform x to Fourier domain X=fft(x)'</span>);0054 disp([<span class="string">'and generate frequency domain Gabor filter G for conv2 or we'</span> <span class="keyword">...</span>0055 <span class="string">' may just use gfrespf2 as'</span>]);0056 G = <a href="gfcreatefilterf2.html" class="code" title="function [g]=gfcreatefilterf2(f0, theta, gamma, eta, N,varargin)">gfcreatefilterf2</a>(f,theta,gamma,eta,[size(img,2) size(img,1)]);0057 resp2 = <a href="gfrespf2.html" class="code" title="function [r]=gfrespf2(gf_, s_, varargin);">gfrespf2</a>(G,img);0058 imagesc(abs(resp1).^2);0059 colormap(gray);0060 colorbar;0061 input(<span class="string">'<RETURN>'</span>);0062 0063 <span class="comment">% Frequency domain filter in one point</span>0064 disp(<span class="string">'Step 4: FILTER WITH 2D FREQUENCY DOMAIN GABOR FILTER IN ONE LOCATION'</span>);0065 disp(<span class="string">'For faster computation we can transform x to Fourier domain X=fft(x)'</span>);0066 disp([<span class="string">'and generate frequency domain Gabor filter G for conv2 or we'</span> <span class="keyword">...</span>0067 <span class="string">' may just use gfrespf2 as'</span>]);0068 G = <a href="gfcreatefilterf2.html" class="code" title="function [g]=gfcreatefilterf2(f0, theta, gamma, eta, N,varargin)">gfcreatefilterf2</a>(f,theta,gamma,eta,[size(img,2) size(img,1)]);0069 resp3 = <a href="gfrespf2.html" class="code" title="function [r]=gfrespf2(gf_, s_, varargin);">gfrespf2</a>(G,img,16,21);0070 disp(<span class="string">'Response:'</span>);0071 disp(resp3);0072 input(<span class="string">'<RETURN>'</span>);0073</pre></div><hr><address>Generated on Fri 23-Nov-2007 14:52:42 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> © 2003</address></body></html>⌨️ 快捷键说明
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