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The most efficient way is to pass the _buffer pointer to a cv::Mat (link). But beware that you now work with the _buffer data.
The other way is to create a cv::Mat and copy the data to it using memcpy or something. Or you create temporarily a cv::Mat from the _buffer pointer and do a deep copy with cv::Mat::clone() to another one.
The link shows you a lot of possibilities how to construct a cv::Mat.
