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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 getRGB</title> <meta name="keywords" content="getRGB"> <meta name="description" content="getRGB(img) - extracts the r, g, and b parts for a color image."> <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="#">mfiles</a> > getRGB.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 .\mfiles <img alt=">" border="0" src="../right.png"></a></td></tr></table>--><h1>getRGB</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>getRGB(img) - extracts the r, g, and b parts for a color image.</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 [r,g,b,in] = getRGB(img,varargin) </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"> getRGB(img) - extracts the r, g, and b parts for a color image.
[r,g,b,in] = getRGB(img,lumThresh)
Returns the r, g, and b components of img as well as
the intensity used for normalization in color
opponency computations, i.e. max(r,g,b).
r, g, and b values at locations with in < lowThresh
are set to zero.
[r,g,b,in] = getRGB(img)
Use lumThresh = 0.1 as default.
See also <a href="makeRedGreenPyramid.html" class="code" title="function [rgPyr,rPyr,gPyr] = makeRedGreenPyramid(image,type)">makeRedGreenPyramid</a>, <a href="makeBlueYellowPyramid.html" class="code" title="function [byPyr,bPyr,yPyr] = makeBlueYellowPyramid(image,type)">makeBlueYellowPyramid</a>.</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)"></ul>This function is called by:<ul style="list-style-image:url(../matlabicon.gif)"><li><a href="makeBlueYellowPyramid.html" class="code" title="function [byPyr,bPyr,yPyr] = makeBlueYellowPyramid(image,type)">makeBlueYellowPyramid</a> makeBlueYellowPyramid - creates a blue-yellow opponency pyramid.</li><li><a href="makeRedGreenPyramid.html" class="code" title="function [rgPyr,rPyr,gPyr] = makeRedGreenPyramid(image,type)">makeRedGreenPyramid</a> makeRedGreenPyramid - creates a red-green opponency pyramid</li></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">% getRGB(img) - extracts the r, g, and b parts for a color image.</span>0002 <span class="comment">%</span>0003 <span class="comment">% [r,g,b,in] = getRGB(img,lumThresh)</span>0004 <span class="comment">% Returns the r, g, and b components of img as well as</span>0005 <span class="comment">% the intensity used for normalization in color</span>0006 <span class="comment">% opponency computations, i.e. max(r,g,b).</span>0007 <span class="comment">% r, g, and b values at locations with in < lowThresh</span>0008 <span class="comment">% are set to zero.</span>0009 <span class="comment">%</span>0010 <span class="comment">% [r,g,b,in] = getRGB(img)</span>0011 <span class="comment">% Use lumThresh = 0.1 as default.</span>0012 <span class="comment">%</span>0013 <span class="comment">% See also makeRedGreenPyramid, makeBlueYellowPyramid.</span>0014 0015 <span class="comment">% This file is part of the SaliencyToolbox - Copyright (C) 2006-2007</span>0016 <span class="comment">% by Dirk B. Walther and the California Institute of Technology.</span>0017 <span class="comment">% See the enclosed LICENSE.TXT document for the license agreement.</span>0018 <span class="comment">% More information about this project is available at:</span>0019 <span class="comment">% http://www.saliencytoolbox.net</span>0020 0021 <a name="_sub0" href="#_subfunctions" class="code">function [r,g,b,in] = getRGB(img,varargin)</a>0022 0023 <span class="keyword">if</span> isempty(varargin)0024 lumThresh = 0.1;0025 <span class="keyword">else</span>0026 lumThresh = varargin{1};0027 <span class="keyword">end</span>0028 0029 r = img(:,:,1);0030 g = img(:,:,2);0031 b = img(:,:,3);0032 in = max(max(r,g),b);0033 0034 <span class="comment">% set everything below the luminance threshold to zero</span>0035 lowIn = (in < lumThresh);0036 r(lowIn) = 0;0037 g(lowIn) = 0;0038 b(lowIn) = 0;</pre></div><hr><address>Generated on Fri 07-Sep-2007 14:42:18 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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