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The constructor shall do it: std::vector< float > array(mat.data);. But if your mat is not float, but uchar 3 channels, then you should transform it: mat.convertTo(mat, CV_32F);

The constructor shall do it: std::vector< float > array(mat.data);. But if your mat is not float, but uchar 3 channels, then you should transform it: it before: mat.convertTo(mat, CV_32F);