说明：  对单幅图像中的三维坐标进行标定，求解基础矩阵，后指定空间坐标点在图像上标定出来。 算法应该是对的，魔方上的点间隔太大，点选得不好导致误差有点大。
(The three-dimensional coordinates in a single image are calibrated, the basic matrix is solved, and then the specified spatial coordinate points are calibrated on the image. The algorithm should be right. The interval between points on the magic cube is too large, and the error is a little large due to the bad selection of points.)