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. Th