qtopencvqstringopencv-mat

OpenCV Mat to Qt QString

I'm using opencv in a Qt app. I've seen some generic c++ ways of printing out the values of a Mat and have done so with 

cout << "myMat = "<< endl << " "  << myMat << endl << endl;

Ideally I could have a QString with the contents of this Mat. Is there a neat way to do this?

Solution

  • You can use ostringstream and its method str() to get string which you can pass as parameter to QString constructor.

        cv::Mat M(2,2, CV_8UC3, cv::Scalar(0,0,255));
    ostringstream oss;
    oss << "M = " << endl << " " << M << endl;
    QString matContent(oss.str()); // QT3
    QString matContent2(oss.str().c_str()); // QT4/5 (const char*) constructor