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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_hdr_check_datatype</title> <meta name="keywords" content="avw_hdr_check_datatype"> <meta name="description" content="avw_hdr_check_datatype - read Analyze format data header (*.hdr)"> <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_hdr_check_datatype.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_hdr_check_datatype</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>avw_hdr_check_datatype - read Analyze format data header (*.hdr)</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 [ avw ] = avw_hdr_check_datatype(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"> avw_hdr_check_datatype - read Analyze format data header (*.hdr)
avw = avw_hdr_check_datatype(avw)
attempts to set the datatype based on the bits per pixel, although
this really needs to be done the other way around. The following
table indicates the values recognised for
avw.hdr.dime.datatype and avw.hdr.dime.bitpix
short int datatype /* Datatype for this image set */
/*Acceptable values for datatype are*/
#define DT_NONE 0
#define DT_UNKNOWN 0 /*Unknown data type*/
#define DT_BINARY 1 /*Binary ( 1 bit per voxel)*/
#define DT_UNSIGNED_CHAR 2 /*Unsigned character ( 8 bits per voxel)*/
#define DT_SIGNED_SHORT 4 /*Signed short (16 bits per voxel)*/
#define DT_SIGNED_INT 8 /*Signed integer (32 bits per voxel)*/
#define DT_FLOAT 16 /*Floating point (32 bits per voxel)*/
#define DT_COMPLEX 32 /*Complex (64 bits per voxel; 2 floating point numbers)/*
#define DT_DOUBLE 64 /*Double precision (64 bits per voxel)*/
#define DT_RGB 128 /*A Red-Green-Blue datatype*/
#define DT_ALL 255 /*Undocumented*/
short int bitpix; /* Number of bits per pixel; 1, 8, 16, 32, or 64. */
See also <a href="avw_hdr_write.html" class="code" title="function avw_hdr_write(avw, fileprefix, machine)">avw_hdr_write</a>, <a href="avw_hdr_make.html" class="code" title="function [ avw ] = avw_hdr_make">avw_hdr_make</a>, <a href="avw_view_hdr.html" class="code" title="function avw_view_hdr(avw,parent)">avw_view_hdr</a>, <a href="avw_view.html" class="code" title="function [ varargout ] = avw_view(avw,parent,command),">avw_view</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)"></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 [ avw ] = avw_hdr_check_datatype(avw)</a>0002 0003 <span class="comment">% avw_hdr_check_datatype - read Analyze format data header (*.hdr)</span>0004 <span class="comment">%</span>0005 <span class="comment">% avw = avw_hdr_check_datatype(avw)</span>0006 <span class="comment">%</span>0007 <span class="comment">% attempts to set the datatype based on the bits per pixel, although</span>0008 <span class="comment">% this really needs to be done the other way around. The following</span>0009 <span class="comment">% table indicates the values recognised for</span>0010 <span class="comment">% avw.hdr.dime.datatype and avw.hdr.dime.bitpix</span>0011 <span class="comment">%</span>0012 <span class="comment">% short int datatype /* Datatype for this image set */</span>0013 <span class="comment">% /*Acceptable values for datatype are*/</span>0014 <span class="comment">% #define DT_NONE 0</span>0015 <span class="comment">% #define DT_UNKNOWN 0 /*Unknown data type*/</span>0016 <span class="comment">% #define DT_BINARY 1 /*Binary ( 1 bit per voxel)*/</span>0017 <span class="comment">% #define DT_UNSIGNED_CHAR 2 /*Unsigned character ( 8 bits per voxel)*/</span>0018 <span class="comment">% #define DT_SIGNED_SHORT 4 /*Signed short (16 bits per voxel)*/</span>0019 <span class="comment">% #define DT_SIGNED_INT 8 /*Signed integer (32 bits per voxel)*/</span>0020 <span class="comment">% #define DT_FLOAT 16 /*Floating point (32 bits per voxel)*/</span>0021 <span class="comment">% #define DT_COMPLEX 32 /*Complex (64 bits per voxel; 2 floating point numbers)/*</span>0022 <span class="comment">% #define DT_DOUBLE 64 /*Double precision (64 bits per voxel)*/</span>0023 <span class="comment">% #define DT_RGB 128 /*A Red-Green-Blue datatype*/</span>0024 <span class="comment">% #define DT_ALL 255 /*Undocumented*/</span>0025 <span class="comment">%</span>0026 <span class="comment">% short int bitpix; /* Number of bits per pixel; 1, 8, 16, 32, or 64. */</span>0027 <span class="comment">%</span>0028 <span class="comment">% See also avw_hdr_write, avw_hdr_make, avw_view_hdr, avw_view</span>0029 <span class="comment">%</span>0030 0031 <span class="comment">% $Revision: 1.1 $ $Date: 2004/02/07 01:41:51 $</span>0032 0033 <span class="comment">% Licence: GNU GPL, no express or implied warranties</span>0034 <span class="comment">% History: 05/2002, Darren.Weber@flinders.edu.au</span>0035 <span class="comment">% The Analyze format and c code below is copyright</span>0036 <span class="comment">% (c) Copyright, 1986-1995</span>0037 <span class="comment">% Biomedical Imaging Resource, Mayo Foundation</span>0038 <span class="comment">%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</span>0039 0040 version = <span class="string">'[$Revision: 1.1 $]'</span>;0041 fprintf(<span class="string">'\nAVW_HDR_CHECK_DATATYPE [v%s]\n'</span>,version(12:16)); tic;0042 0043 <span class="keyword">if</span> ~exist(<span class="string">'avw'</span>,<span class="string">'var'</span>),0044 msg = sprintf(<span class="string">'...no input avw\n\n'</span>);0045 error(msg);0046 <span class="keyword">end</span>0047 0048 0049 <span class="keyword">switch</span> avw.hdr.dime.bitpix,0050 0051 <span class="keyword">case</span> 0,0052 error(<span class="string">'avw.hdr.dime.bitpix = 0, unknown datatype'</span>);0053 0054 <span class="keyword">case</span> 1,0055 avw.hdr.dime.datatype = 1;0056 0057 <span class="keyword">case</span> 8,0058 avw.hdr.dime.datatype = 2;0059 0060 <span class="keyword">case</span> 16,0061 avw.hdr.dime.datatype = 4;0062 0063 <span class="keyword">case</span> 32,0064 warning(<span class="string">'bitpix = 32, assuming datatype is float (rather than signed int)'</span>);0065 avw.hdr.dime.datatype = 16;0066 0067 <span class="keyword">case</span> 64,0068 warning(<span class="string">'bitpix = 64, assuming datatype is double (rather than complex)'</span>);0069 avw.hdr.dime.datatype = 64;0070 0071 <span class="keyword">case</span> 128,0072 avw.hdr.dime.datatype = 128;0073 0074 <span class="keyword">otherwise</span>0075 error(<span class="string">'unknown bitpix and datatype'</span>);0076 0077 <span class="keyword">end</span>0078 0079 t = toc; fprintf(<span class="string">'...done ( %6.2f sec)\n\n'</span>,t);0080 0081 <span class="keyword">return</span></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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