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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 makeSqrt2Pyramid</title> <meta name="keywords" content="makeSqrt2Pyramid"> <meta name="description" content="makeSqrt2Pyramid - creates a sqrt(2) Gaussian pyramid."> <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> > makeSqrt2Pyramid.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>makeSqrt2Pyramid</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>makeSqrt2Pyramid - creates a sqrt(2) Gaussian pyramid.</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 pyr = makeSqrt2Pyramid(map,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"> makeSqrt2Pyramid - creates a sqrt(2) Gaussian pyramid. pyr = makeSqrt2Pyramid(map) Creates a Gaussian pyramid with levels separated by a factor of sqrt(2) by bilinear interpolation between levels of a dyadic Gaussian pyramid. pyr = makeSqrt2Pyramid(map,depth) Creates at most depth levels. See also <a href="makeDyadicPyramid.html" class="code" title="function pyr = makeDyadicPyramid(map,varargin)">makeDyadicPyramid</a>, <a href="mexGaussianSubsample.html" class="code" title="function result = mexGaussianSubsample(image)">mexGaussianSubsample</a>, <a href="makeGaussianPyramid.html" class="code" title="function pyr = makeGaussianPyramid(map,type,varargin)">makeGaussianPyramid</a>, <a href="dataStructures.html" class="code" title="">dataStructures</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)"><li><a href="mexGaussianSubsample.html" class="code" title="function result = mexGaussianSubsample(image)">mexGaussianSubsample</a> mexGaussianSubsample - smooths and subsamples image (mex file).</li><li><a href="timeString.html" class="code" title="function s = timeString()">timeString</a> timeString returns the current time and date in a convenient string format.</li></ul>This function is called by:<ul style="list-style-image:url(../matlabicon.gif)"><li><a href="makeGaussianPyramid.html" class="code" title="function pyr = makeGaussianPyramid(map,type,varargin)">makeGaussianPyramid</a> makeGaussianPyramid - creates a Gaussian pyramid from map.</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">% makeSqrt2Pyramid - creates a sqrt(2) Gaussian pyramid.</span>0002 <span class="comment">%</span>0003 <span class="comment">% pyr = makeSqrt2Pyramid(map)</span>0004 <span class="comment">% Creates a Gaussian pyramid with levels separated by a</span>0005 <span class="comment">% factor of sqrt(2) by bilinear interpolation between</span>0006 <span class="comment">% levels of a dyadic Gaussian pyramid.</span>0007 <span class="comment">%</span>0008 <span class="comment">% pyr = makeSqrt2Pyramid(map,depth)</span>0009 <span class="comment">% Creates at most depth levels.</span>0010 <span class="comment">%</span>0011 <span class="comment">% See also makeDyadicPyramid, mexGaussianSubsample, makeGaussianPyramid, dataStructures.</span>0012 0013 <span class="comment">% This file is part of the SaliencyToolbox - Copyright (C) 2006-2007</span>0014 <span class="comment">% by Dirk B. Walther and the California Institute of Technology.</span>0015 <span class="comment">% See the enclosed LICENSE.TXT document for the license agreement.</span>0016 <span class="comment">% More information about this project is available at:</span>0017 <span class="comment">% http://www.saliencytoolbox.net</span>0018 0019 <a name="_sub0" href="#_subfunctions" class="code">function pyr = makeSqrt2Pyramid(map,varargin)</a>0020 0021 <span class="keyword">if</span> (isempty(varargin)) depth = -1;0022 <span class="keyword">else</span> depth = varargin{1}; <span class="keyword">end</span>0023 0024 lab = map.label;0025 0026 pyr.origImage = map.origImage;0027 pyr.label = lab;0028 pyr.type = <span class="string">'sqrt2'</span>;0029 map.label = [lab <span class="string">'-1'</span>];0030 map.parameters.type = <span class="string">'sqrt2'</span>;0031 0032 pyr.levels(1) = map;0033 0034 method = <span class="string">'bilinear'</span>;0035 0036 n = 1;0037 <span class="keyword">while</span> (min(size(pyr.levels(n).data)) > 1)0038 <span class="keyword">if</span> ((depth > 0) & (n >= depth)) <span class="keyword">break</span>; <span class="keyword">end</span>0039 0040 n = n + 1;0041 0042 newMap = [];0043 newMap.origImage = map.origImage;0044 newMap.label = sprintf(<span class="string">'%s-%d'</span>,lab,n);0045 0046 <span class="keyword">if</span> (mod(n,2) == 0)0047 0048 <span class="comment">% even levels: interpolate from previous level</span>0049 prev = pyr.levels(n-1).data;0050 <span class="keyword">if</span> (min(size(prev)) <= 4)0051 method = <span class="string">'nearest'</span>;0052 <span class="keyword">end</span>0053 newMap.data = imresize(prev,round(size(prev)/sqrt(2)),method);0054 <span class="keyword">else</span>0055 0056 <span class="comment">% odd levels: dyadic subsampling from the level two back</span>0057 newMap.data = <a href="mexGaussianSubsample.html" class="code" title="function result = mexGaussianSubsample(image)">mexGaussianSubsample</a>(pyr.levels(n-2).data);0058 <span class="keyword">end</span>0059 0060 newMap.date = <a href="timeString.html" class="code" title="function s = timeString()">timeString</a>;0061 newMap.parameters.type = <span class="string">'sqrt2'</span>;0062 pyr.levels(n) = newMap;0063 <span class="keyword">end</span>0064 0065 pyr.date = <a href="timeString.html" class="code" title="function s = timeString()">timeString</a>;</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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