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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 avw_estimate_noise</title> <meta name="keywords" content="avw_estimate_noise"> <meta name="description" content=""> <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">mri_toolbox</a> > avw_estimate_noise.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 mri_toolbox <img alt=">" border="0" src="../right.png"></a></td></tr></table>--><h1>avw_estimate_noise</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong></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 noise_mean = avw_estimate_noise(avw) </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"></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)"></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 <a name="_sub0" href="#_subfunctions" class="code">function noise_mean = avw_estimate_noise(avw)</a>0002 0003 0004 0005 [s1,s2,s3] = size(avw.img);0006 0007 slice_x0 = avw.img(1,:,:);0008 slice_x0_mean = mean(mean(slice_x0));0009 0010 <span class="keyword">if</span> s1 > 1,0011 slice_x1 = avw.img(<span class="keyword">end</span>,:,:);0012 slice_x1_mean = mean(mean(slice_x1));0013 x_mean = mean(slice_x0_mean, slice_x1_mean);0014 <span class="keyword">else</span>0015 x_mean = slice_x0_mean;0016 <span class="keyword">end</span>0017 0018 slice_y0 = avw.img(:,1,:);0019 slice_y0_mean = mean(mean(slice_y0));0020 0021 <span class="keyword">if</span> s2 > 1,0022 slice_y1 = avw.img(:,<span class="keyword">end</span>,:);0023 slice_y1_mean = mean(mean(slice_y1));0024 y_mean = mean(slice_y0_mean, slice_y1_mean);0025 <span class="keyword">else</span>0026 y_mean = slice_y0_mean;0027 <span class="keyword">end</span>0028 0029 slice_z0 = avw.img(:,:,1);0030 slice_z0_mean = mean(mean(slice_z0));0031 0032 <span class="keyword">if</span> s3 > 1,0033 slice_z1 = avw.img(:,:,end);0034 slice_z1_mean = mean(mean(slice_z1));0035 z_mean = mean(slice_z0_mean, slice_z1_mean);0036 <span class="keyword">else</span>0037 z_mean = slice_z0_mean;0038 <span class="keyword">end</span>0039 0040 noise_mean = mean([x_mean,y_mean,z_mean]);0041</pre></div><hr><address>Generated on Fri 21-May-2004 12:38:21 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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