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Afaik you need to write it yourself, e.g.:

cv::Mat3b QImage2Mat(const QImage &src) {
  unsigned int height = src.height();
  unsigned int width = src.width();

  cv::Mat3b dest(height, width);
  for (unsigned int y = 0; y < height; ++y) {
    cv::Vec3b *destrow = dest[y];
    for (unsigned int x = 0; x < width; ++x) {
      QRgb pxl = src.pixel(x, y);
      destrow[x] = cv::Vec3b(qBlue(pxl), qGreen(pxl), qRed(pxl));
    }
  }
  return dest;
}