?? make_noisy_data.html
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<html><head> <meta HTTP-EQUIV="Content-Type" CONTENT="text/html;charset=ISO-8859-1"> <title>make_noisy_data.m</title><link rel="stylesheet" type="text/css" href="../../../m-syntax.css"></head><body><code><span class=h1>% MAKE_NOISY_DATA Adds Gaussian noise to USPS database.</span><br><span class=help>%</span><br><span class=help>% <span class=help_field>Description:</span></span><br><span class=help>% It adds Gaussian noise to the USPS images. The input</span><br><span class=help>% file usps.mat contains training trn.X and testing </span><br><span class=help>% tst.X part. This script generates file usps_noisy</span><br><span class=help>% which contains</span><br><span class=help>% trn.gnd_X [256x7291] Original training USPS data.</span><br><span class=help>% trn.X [256x7291] USPS data with added Gaussian noise.</span><br><span class=help>% trn.y [1x7291] Labels (1..10).</span><br><span class=help>%</span><br><span class=help>% tst.gnd_X [256x2007] Original testing USPS data.</span><br><span class=help>% tst.X [256x2007] USPS data with added Gaussian noise.</span><br><span class=help>% tst.y [1x2007] Labels (1..10).</span><br><span class=help>% </span><br><hr><span class=help1>% <span class=help1_field>About:</span> Statistical Pattern Recognition Toolbox</span><br><span class=help1>% (C) 1999-2003, Written by Vojtech Franc and Vaclav Hlavac</span><br><span class=help1>% <a href="http://www.cvut.cz">Czech Technical University Prague</a></span><br><span class=help1>% <a href="http://www.feld.cvut.cz">Faculty of Electrical Engineering</a></span><br><span class=help1>% <a href="http://cmp.felk.cvut.cz">Center for Machine Perception</a></span><br><br><span class=help1>% <span class=help1_field>Modifications:</span></span><br><span class=help1>% 07-jun-2004, VF</span><br><br><hr><span class=comment>% setting</span><br><span class=comment>%---------------------------------------------</span><br><span class=comment>% signal to noise ratio</span><br>snr = 1;<br><br>input_data_file = <span class=quotes>'/home.dokt/xfrancv/data/usps/usps.mat'</span>;<br>output_data_file = <span class=quotes>'/home.dokt/xfrancv/data/usps/usps_noisy.mat'</span>;<br><br><span class=comment>% load input file</span><br>orig = load(input_data_file);<br><br><span class=comment>% add noise</span><br>trn.X = orig.trn.X + randn(size(orig.trn.X))*(std(orig.trn.X(:))/snr);<br>trn.y = orig.trn.y;<br>trn.gnd_X = orig.trn.X;<br>tst.X = orig.tst.X + randn(size(orig.tst.X))*(std(orig.tst.X(:))/snr);<br>tst.y = orig.tst.y;<br>tst.gnd_X = orig.tst.X;<br><br><span class=comment>% save it to file</span><br>save(output_data_file,<span class=quotes>'tst'</span>,<span class=quotes>'trn'</span>);<br><br><span class=comment>% EOF</span><br></code>?? 快捷鍵說明
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