点初始化
1. 二维点：cv::Point2f
三维点：cv::Point3f
2. vector<Point3f> pts_3d;
pts_3d.push_back(Point3f(p1.x, p1.y, 30));
3. 指针使用
ushort d = d1.ptr<unsigned short>(int(keypoints_1[m.queryIdx].pt.y))[int(keypoints_1[m.queryIdx].pt.x)];
① ushort类型
② d1.ptr<unsigned short>(int(keypoints_1[m.queryIdx].pt.y)) 该行指针
③ d1.ptr<类型>(行号)[列号] 该列的像素值
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