How should a typical .yml or .xml matrix look for OpenCV use

Question

I need to specify a matrix inside a file and then load it onto OpenCV as a Mat for further processing. How can the cols and lines be specified and where do elements

Answer 1

Read/Write any OpenCV data structure to or from .xml / .yaml file is very simple.

Before you write any content to such file you need to open it and at the end to close it. The XML/YAML data structure in OpenCV is FileStorage.

string filename = "I.xml";
FileStorage fs(filename, FileStorage::WRITE);

Mat R = Mat_<uchar >::eye (3, 3),

fs << "R" << R; // Write entire cv::Mat
fs["R"] >> R;   // Read entire cv::Mat

Check out this link File Input and Output using XML and YAML files