vector＜cv::point2f＞如何快速转成opencv mat

cv::Mat mat(points); // N×1, CV_32FC2（零拷贝）cv::Mat mat(points.size(), 2, CV_32F);

for (size_t i = 0; i < points.size(); ++i) {

mat.at<float>(i, 0) = points[i].x;

mat.at<float>(i, 1) = points[i].y;

}

cv::Mat points1 = cv::Mat(points).reshape(1);