opencv 如何输出某个pixel 的三维坐标

极简单的输出某个pixel所对应的三维的坐标：Point p;p.x = 440; p.y = 160;reprojectImageTo3D(disp_sgbm, XYZ, Q, false, -1);cout << "in world coordinate: " << XYZ.at<Vec3f>(p) << endl;