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OpenCV XML I/O

Example1

// somewhere deep in your code…you get 5x5// matrix that you’d want to save{CvMat A = cvMat( 5, 5, CV_32F, the_matrix_data);cvSave( “my_matrix.xml”, &A );// cvSave( “my_matrix.xml”, &A, "my_matrix", "comment" );}// to load it then in some other program use …CvMat* A1 = (CvMat*)cvLoad( “my_matrix.xml”);

<?xml version="1.0"?><opencv_storage>  <my_matrix type_id="opencv-matrix">  <rows>5</rows>    <cols>5</cols>    <dt>f</dt>    <data>1. 0. 0. 0. 0. 0. 1. 0. 0. 0. 0.0. 1. 0. 0. 0. 0. 0. 1. 0. 0. 0. 0.0. 1.</data>  </my_matrix></opencv_storage>

Example2

CvFileStorage* fs=cvOpenFileStorage(“cfg.xml”, 0,CV_STORAGE_WRITE);cvWriteInt( fs, “frame_count”, 10 );cvWriteStartWriteStruct( fs, “frame_size”, CV_NODE_SEQ);cvWriteInt( fs, 0, 320 );cvWriteint( fs, 0, 200 );cvEndWriteStruct(fs);cvWrite( fs, “color_cvt_matrix”, cmatrix);cvReleaseFileStorage( &fs);

<?xml version="1.0"?><opencv_storage>  <frame_count>10</frame_count>  <frame_size>320 200</frame_size>  <color_cvt_matrix type_id="opencv-matrix">    <rows>3</rows>    <cols>3</cols>    <dt>f</dt>    <data>...</data>  </color_cvt_matrix></opencv_storage>

CvFileStorage* fs= cvOpenFileStorage(“cfg.xml”, 0, CV_STORAGE_READ);int frame_count=cvReadIntByName( fs, 0, “frame_count”, 10 /* default value */ );CvSeq* s =cvGetFileNodeByName(fs,0,”frame_size”)->data.seq;int frame_width= cvReadInt( (CvFileNode*)cvGetSeqElem(s,0) );int frame_height= cvReadInt( (CvFileNode*)cvGetSeqElem(s,1) );CvMat* color_cvt_matrix= (CvMat*)cvRead(fs,0,”color_cvt_matrix”);cvReleaseFileStorage( &fs);