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create_kd_tree
- 通过计算方差,确定划分坐标轴,最后,将点云划分到一个个格子中,这样的好处在于可以将噪点和有效点分别存储于不同的格子中,方便进行去噪。(k-d tree create;By calculating the variance, the coordinate axis is determined. Finally, the point cloud is divided into a number of lattices. The advantage is that the noise and the