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You can try by your own, it need less time to test it than write an answer here :D. The documentation say yes, you can do in this way since the second parameter can be a scalar or a matrix. If it doesn't work, try cv::Scalar(1);

You can try by your own, it need less time to test it than write an answer a question here :D. The documentation say yes, you can do in this way since the second parameter can be a scalar or a matrix. If it doesn't work, try cv::Scalar(1);