Converting a .mat file from MATLAB into cv::Mat matrix in OpenCV

Question

I have some MATLAB code that I want to migrate to OpenCV. The data that the MATLAB code uses is stored in a .mat file which is then loaded at run time.

I converted

Answer 1

You can use the Matlab bridge from opencv contrib. All you need from Opencv Contrib is to copy contrib/modules/matlab/include/opencv2/matlab folder into the include/opencv2 folder.

along with the Matlab Compiler Runtime (just libmx.lib, libmex.lib and libmat.lib).

MATFile *pmat = matOpen(filename, "r");
if (pmat == NULL)
{
     cerr << "Error opening file " << filename << endl;
}
else
{
     int numVars;
     char** namePtr = matGetDir(pmat, &numVars);
     cout << filename << " contains vars " << endl;
     for (int idx = 0; idx < numVars; idx++)
     {
           std::cout << "                     " << namePtr[idx] << " ";
           mxArray* m = matGetVariable(pmat, namePtr[idx]);
           matlab::MxArray mArray(m);
           cv::bridge::Bridge bridge(mArray);
           cv::Mat mat = bridge.toMat();
           //  do something with opencv Mat 
     }
}