// init intrinsic parameters (XML file)
cv::Mat intrinsic;
cv::Mat distortion;
cv::FileStorage cvfs("calibration.xml", CV_STORAGE_READ);
bool isOpened = cvfs.isOpened();
if(isOpened)
{
cvfs["mat_intrinsicMat"] >> intrinsic;
cvfs["mat_distortionMat"] >> distortion;
cvfs.release();
std::cout << intrinsic << std::endl;
std::cout << distortion << std::endl;
}