OpenCV和Matlab 通过XML传递数据

因为现在下到的数据集大部分都使用了Matlab的Calibration toolbox 进行标定，其结构大部分是.mat结构的，所以它和opencv中数据传递需要一个中间过程，网上也有直接调用matlab的dll的方法，但是中间件方法必然会受到版本限制，所以我最后还是选择了使用xml来作为中间文件传递数据。

--------------1.calibration toolbox原始标定的.m数据--------------

 

http://ishare.iask.sina.com.cn/f/67004587.html

 

--------------2.通过matlab根据opencv的存储格式写成的xml文件--------------

http://ishare.iask.sina.com.cn/f/67004482.html

 

 

--------------3.matlab端转换代码--------------

 

function  writeXML( name,fc,kc,alpha_c,cc,om,t )

%WRITEXML write mat to xml file

%   this function is used to convert matrix information from matlab to

%   opencv

kk=[fc(1) alpha_c*fc(1) cc(1); 0 fc(2) cc(2);0 0 1];

 

%write FC

xdoc=com.mathworks.xml.XMLUtils.createDocument('opencv_storage');

xroot=xdoc.getDocumentElement;

[m,n]=size(fc);

 

type=xdoc.createElement_x_x_x_x_x('fc');

type.setAttribute('type_id','opencv-matrix')

xroot.a(type);

 

rows=xdoc.createElement_x_x_x_x_x('rows');

rows.a(xdoc.createTextNode(sprintf('%d',m)));

type.a(rows);

 

cols=xdoc.createElement_x_x_x_x_x('cols');

cols.a(xdoc.createTextNode(sprintf('%d',n)));

type.a(cols);

 

dt=xdoc.createElement_x_x_x_x_x('dt');

dt.a(xdoc.createTextNode(sprintf('%s','d')));

 

type.a(dt);

data=xdoc.createElement_x_x_x_x_x('data');

for i=1:m

    for j=1:n

        data.a(xdoc.createTextNode(sprintf('%d',fc(i,j))));

         data.a(xdoc.createTextNode(sprintf('%s',' ')));

    end

end

type.a(data);

 

%write KC

[m,n]=size(kc);

type=xdoc.createElement_x_x_x_x_x('kc');

type.setAttribute('type_id','opencv-matrix')

xroot.a(type);

 

rows=xdoc.createElement_x_x_x_x_x('rows');

rows.a(xdoc.createTextNode(sprintf('%d',m)));

type.a(rows);

 

cols=xdoc.createElement_x_x_x_x_x('cols');

cols.a(xdoc.createTextNode(sprintf('%d',n)));

type.a(cols);

 

dt=xdoc.createElement_x_x_x_x_x('dt');

dt.a(xdoc.createTextNode(sprintf('%s','d')));

 

type.a(dt);

data=xdoc.createElement_x_x_x_x_x('data');

for i=1:m

    for j=1:n

        data.a(xdoc.createTextNode(sprintf('%d',kc(i,j))));

         data.a(xdoc.createTextNode(sprintf('%s',' ')));

    end

end

type.a(data);

 

 

%write ALPHA_C

[m,n]=size(alpha_c);

type=xdoc.createElement_x_x_x_x_x('alpha_c');

type.setAttribute('type_id','opencv-matrix')

xroot.a(type);

 

rows=xdoc.createElement_x_x_x_x_x('rows');

rows.a(xdoc.createTextNode(sprintf('%d',m)));

type.a(rows);

 

cols=xdoc.createElement_x_x_x_x_x('cols');

cols.a(xdoc.createTextNode(sprintf('%d',n)));

type.a(cols);

 

dt=xdoc.createElement_x_x_x_x_x('dt');

dt.a(xdoc.createTextNode(sprintf('%s','d')));

 

type.a(dt);

data=xdoc.createElement_x_x_x_x_x('data');

for i=1:m

    for j=1:n

        data.a(xdoc.createTextNode(sprintf('%d',alpha_c(i,j))));

         data.a(xdoc.createTextNode(sprintf('%s',' ')));

    end

end

type.a(data);

 

 

%write CC

[m,n]=size(cc);

type=xdoc.createElement_x_x_x_x_x('cc');

type.setAttribute('type_id','opencv-matrix')

xroot.a(type);

 

rows=xdoc.createElement_x_x_x_x_x('rows');

rows.a(xdoc.createTextNode(sprintf('%d',m)));

type.a(rows);

 

cols=xdoc.createElement_x_x_x_x_x('cols');

cols.a(xdoc.createTextNode(sprintf('%d',n)));

type.a(cols);

 

dt=xdoc.createElement_x_x_x_x_x('dt');

dt.a(xdoc.createTextNode(sprintf('%s','d')));

 

type.a(dt);

data=xdoc.createElement_x_x_x_x_x('data');

for i=1:m

    for j=1:n

        data.a(xdoc.createTextNode(sprintf('%d',cc(i,j))));

         data.a(xdoc.createTextNode(sprintf('%s',' ')));

    end

end

type.a(data);

 

%write KK

[m,n]=size(kk);

type=xdoc.createElement_x_x_x_x_x('kk');

type.setAttribute('type_id','opencv-matrix')

xroot.a(type);

 

rows=xdoc.createElement_x_x_x_x_x('rows');

rows.a(xdoc.createTextNode(sprintf('%d',m)));

type.a(rows);

 

cols=xdoc.createElement_x_x_x_x_x('cols');

cols.a(xdoc.createTextNode(sprintf('%d',n)));

type.a(cols);

 

dt=xdoc.createElement_x_x_x_x_x('dt');

dt.a(xdoc.createTextNode(sprintf('%s','d')));

 

type.a(dt);

data=xdoc.createElement_x_x_x_x_x('data');

for i=1:m

    for j=1:n

        data.a(xdoc.createTextNode(sprintf('%d',kk(i,j))));

         data.a(xdoc.createTextNode(sprintf('%s',' ')));

    end

end

type.a(data);

 

 

%write OM

[m,n]=size(om);

type=xdoc.createElement_x_x_x_x_x('om');

type.setAttribute('type_id','opencv-matrix')

xroot.a(type);

 

rows=xdoc.createElement_x_x_x_x_x('rows');

rows.a(xdoc.createTextNode(sprintf('%d',m)));

type.a(rows);

 

cols=xdoc.createElement_x_x_x_x_x('cols');

cols.a(xdoc.createTextNode(sprintf('%d',n)));

type.a(cols);

 

dt=xdoc.createElement_x_x_x_x_x('dt');

dt.a(xdoc.createTextNode(sprintf('%s','d')));

 

type.a(dt);

data=xdoc.createElement_x_x_x_x_x('data');

for i=1:m

    for j=1:n

        data.a(xdoc.createTextNode(sprintf('%d',om(i,j))));

         data.a(xdoc.createTextNode(sprintf('%s',' ')));

    end

end

type.a(data);

 

%write T

[m,n]=size(t);

type=xdoc.createElement_x_x_x_x_x('t');

type.setAttribute('type_id','opencv-matrix')

xroot.a(type);

 

rows=xdoc.createElement_x_x_x_x_x('rows');

rows.a(xdoc.createTextNode(sprintf('%d',m)));

type.a(rows);

 

cols=xdoc.createElement_x_x_x_x_x('cols');

cols.a(xdoc.createTextNode(sprintf('%d',n)));

type.a(cols);

 

dt=xdoc.createElement_x_x_x_x_x('dt');

dt.a(xdoc.createTextNode(sprintf('%s','d')));

 

type.a(dt);

data=xdoc.createElement_x_x_x_x_x('data');

for i=1:m

    for j=1:n

        data.a(xdoc.createTextNode(sprintf('%d',t(i,j))));

         data.a(xdoc.createTextNode(sprintf('%s',' ')));

    end

end

type.a(data);

 

 

 

str=strcat(name,'.xml');

xmlwrite(str,xdoc);

end

 

--------------4.C++读取代码--------------

 

 

#include"highgui.h"

#include"cv.h"

#include

#include

#include

using namespace  std;

using namespace cv;

int main(void)

{

//*********Read XML Example*********

//1.cvFileStorage write XML Example

int a=1;

float b=2;

double c[]={3,5,6,6};

CvMat *mat=cvCreateMat(3,3,CV_32SC1);

cvSetIdentity(mat);

CvFileStorage *fs=cvOpenFileStorage("test1.xml",0,CV_STORAGE_WRITE);

cvWriteComment(fs,"my data",1);

cvStartWriteStruct(fs,"DATA",CV_NODE_MAP,0,cvAttrList(0,0));

 

cvStartWriteStruct(fs,"c",CV_NODE_SEQ,0,cvAttrList(0,0));

cvWriteRawData(fs,c,4,"d");

cvEndWriteStruct(fs);

cvSave("mat.xml",mat);

cvWriteInt(fs,"a",a);

cvWriteReal(fs,"b",b);

cvStartWriteStruct(fs,"c",CV_NODE_SEQ,0,cvAttrList(0,0));

cvWriteRawData(fs,c,4,"d");

cvEndWriteStruct(fs);

cvReleaseFileStorage(&fs);

cvReleaseMat(&mat);

 

 

//2.Mat to XML 

CvMat *writemat=cvCreateMat(3,3,CV_64FC1);

cvSetIdentity(writemat);

cvSave("test.xml",writemat);

 

 

//*********Read XML Example*********

    //1. Direct read sigle CvMat Example

 

CvMat *testmat=(CvMat *)cvLoad("test.xml");

for(int i=0;irows;i++)

{

for(int j=0;jcols;j++)

cout<<CV_MAT_ELEM(*testmat,double,i,j)<<" ";

cout<<endl;

 

}

system("PAUSE");

//2.File Storage multi dataset Example

FileStorage fss;

fss.open("cam1.xml",FileStorage::READ);

Mat fc,cc,kc,alpha_c,kk,om,t;

fss["fc"]>>fc;

fss["cc"]>>cc;

fss["kc"]>>kc;

fss["alpha_c"]>>alpha_c;

fss["kk"]>>kk;

fss["om"]>>om;

fss["t"]>>t;

cout<<"fc:"<<endl<<fc<<endl;

cout<<"cc:"<<endl<<cc<<endl;

cout<<"kc:"<<endl<<kc<<endl;

cout<<"alpha_c:"<<endl<<alpha_c<<endl;

cout<<"kk:"<<endl<<kk<<endl;

cout<<"om:"<<endl<<om<<endl;

cout<<"t:"<<endl<<t<<endl;

fss.release();

system("PAUSE");

return 0;

 

}

通过上面的过程，就可以在matlab和opencv中间传递数据了，看似很麻烦，但是实际使用 上经过模块化是非常方便的，尤其是有大量的矩阵需要传递的时候，在传递中采用了逐个mat读取的方法，当然，要传递的矩阵不多的时候，可以采用合并矩阵， 用cvload读取后再分割出所需数据的方法，这种方法的效率应该更高，但是需要已知传递的矩阵结构

 

from: http://blog.sina.com.cn/s/blog_5e3213f30101hdt6.html