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cvuOpenCvSave.m
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cvuOpenCvSave.m
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% cvuOpenCvSave - (CV Utility) Save data in OpenCV CvFileStorage XML format
%
% Synopsis
% cvuOpenCvSave(filename, var, varname)
%
% Description
%
% Inputs ([]s are optional)
% (string) filename The xml filename to be written
% (matrix) var The matrix variable to be written
% (string) [varname = filename]
% The variable name. If not given,
% filename is used.
%
% Outputs ([]s are optional)
% None
%
% See also
% cvuOpenCvLoad, OpenCV's cvSave
% Authors
% Naotoshi Seo <sonots(at)sonots.com>
%
% License
% The program is free to use for non-commercial academic purposes,
% but for course works, you must understand what is going inside to use.
% The program can be used, modified, or re-distributed for any purposes
% if you or one of your group understand codes (the one must come to
% court if court cases occur.) Please contact the authors if you are
% interested in using the program without meeting the above conditions.
%
% Changes
% 12/01/2008 First Edition
function cvuOpenCvSave(filename, var, varname)
[dirname, basename, ext] = fileparts(filename);
if ~strcmp(ext, '.xml')
error('Currently only xml is supported.');
end
if ~exist('varname', 'var') || isempty(varname)
varname = basename;
end
%% Built-in xmlwrite
dom = com.mathworks.xml.XMLUtils.createDocument('opencv_storage');
domRootNode = dom.getDocumentElement;
domVarNode = dom.createElement(varname);
domVarNode.setAttribute('type_id', 'opencv-matrix');
thisElement = dom.createElement('rows');
thisElement.appendChild(dom.createTextNode(sprintf('%d',size(var,1))));
domVarNode.appendChild(thisElement);
thisElement = dom.createElement('cols');
thisElement.appendChild(dom.createTextNode(sprintf('%d',size(var,2))));
domVarNode.appendChild(thisElement);
thisElement = dom.createElement('dt');
thisElement.appendChild(dom.createTextNode('d'));
domVarNode.appendChild(thisElement);
thisElement = dom.createElement('data');
%data = num2str(reshape(var.', 1, []));
% Above is bad because OpenCv cvLoad returns error if one line is too long
%data = num2str(reshape(var.', [], 1));
% is preferred, but matlab DOM did not work for this ...
data = mat2str(reshape(var.', [], 1));
data = data(2:end-1); % remove []
data = strrep(data, ';', '\n');
thisElement.appendChild(dom.createTextNode(data));
domVarNode.appendChild(thisElement);
domRootNode.appendChild(domVarNode);
tmpname = tempname();
xmlwrite(tmpname, dom);
% <?xml version="1.0" encoding="utf-8"?> -> <?xml version="1.0"?>
% @todo: find smarter way
tmp = fopen(tmpname, 'r');
fid = fopen(filename, 'w');
tline = fgetl(tmp);
fprintf(fid, '<?xml version="1.0"?>\n');
while 1
tline = fgetl(tmp);
if ~ischar(tline), break, end
fprintf(fid, [tline,'\n']);
end
fclose(fid);
fclose(tmp);
% <?xml version="1.0" encoding="utf-8"?>
% <opencv_storage>
% <A type_id="opencv-matrix">
% <rows>3</rows>
% <cols>4</cols>
% <dt>f</dt>
% <data>1 0 0 0 0 1 0 0 0 0 1 0</data>
% </A>
% </opencv_storage>
%% xml_toolbox
% opencv_storage = [];
% eval(sprintf('opencv_storage.%s.ATTRIBUTE.type_id = ''opencv-matrix'';', varname));
% eval(sprintf('opencv_storage.%s.rows = size(var,1);', varname));
% eval(sprintf('opencv_storage.%s.cols = size(var,2);', varname));
% eval(sprintf('opencv_storage.%s.dt = ''d'';', varname));
% eval(sprintf('opencv_storage.%s.data = var.'';', varname));
% xml = xml_formatany(opencv_storage, 'opencv_storage');
% fid = fopen(filename, 'w');
% fprintf(fid, '<?xml version="1.0"?>\n');
% fprintf(fid, xml);
% fclose(fid);
% <?xml version="1.0"?>
% <opencv_storage xml_tb_version="3.1">
% <A type_id="opencv-matrix">
% <rows>3</rows>
% <cols>4</cols>
% <dt>f</dt>
% <data>1 0 0 0 0 1 0 0 0 0 1 0</data>
% </A>
% </opencv_storage>
%% xml_io_tools
% opencv_storage = [];
% eval(sprintf('opencv_storage.%s.ATTRIBUTE.type_id = ''opencv-matrix'';', varname));
% eval(sprintf('opencv_storage.%s.rows = size(var,1);', varname));
% eval(sprintf('opencv_storage.%s.cols = size(var,2);', varname));
% eval(sprintf('opencv_storage.%s.dt = ''d'';', varname));
% eval(sprintf('opencv_storage.%s.data = reshape(var.'', 1, []);',varname));
% xml_write(filename, opencv_storage);
% <?xml version="1.0" encoding="utf-8"?>
% <opencv_storage xml_tb_version="3.1">
% <A type_id="opencv-matrix">
% <rows>3</rows>
% <cols>4</cols>
% <dt>f</dt>
% <data>[1 0 0 0 0 1 0 0 0 0 1 0]</data>
% </A>
% </opencv_storage>
%% Goal
% #include "cxcore.h"
%
% int main( int argc, char** argv )
% {
% CvMat* mat = cvCreateMat( 3, 4, CV_32F );
% CvFileStorage* fs = cvOpenFileStorage( "example.xml", 0, CV_STORAGE_WRITE );
%
% cvSetIdentity( mat );
% cvWrite( fs, "A", mat, cvAttrList(0,0) );
%
% cvReleaseFileStorage( &fs );
% cvReleaseMat( &mat );
% return 0;
% }
% <?xml version="1.0"?>
% <opencv_storage>
% <A type_id="opencv-matrix">
% <rows>3</rows>
% <cols>4</cols>
% <dt>f</dt>
% <data>
% 1. 0. 0. 0. 0. 1. 0. 0. 0. 0. 1. 0.</data></A>
% </opencv_storage>
end