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just add a border:

Mat src = ...
Mat dst;
copyMakeBorder(src, dst ,0, 20, 50, 0, BORDER_CONSTANT, Scalar::all(255));

just add a border:

Mat src = ...
Mat dst;
copyMakeBorder(src, dst ,0, 20, 10, 50, 0, BORDER_CONSTANT, Scalar::all(255));