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Convert rect to Mat :

    vector<Rect> x;
    x.push_back(Rect(0, 0, 1, 1));
    x.push_back(Rect(2, 2, 1, 1));
    x.push_back(Rect(3, 3, 1, 1));
    Mat w(x);
    cout << w << "\n";

results are :

[0, 0, 1, 1;
 2, 2, 1, 1;
 3, 3, 1, 1]