carenic

// convert an OpenCV multi-channel matrix to Armadillo cube. A copy is made
template <typename T, int NC>
Cube<T> to_arma(const cv::Mat_<cv::Vec<T, NC>> &src)
{
  vector<cv::Mat_<T>> channels;
  Cube<T> dst(src.cols, src.rows, NC);
  for (int c = 0; c < NC; ++c)
    channels.push_back({src.rows, src.cols, dst.slice(c).memptr()});
  cv::split(src, channels);	
  return dst;