说明：  点云滤波是点云处理的基本步骤，也是进行 high level 三维图像处理之前必须要进行的预处理。其作用类似于信号处理中的滤波，但实现手段却和信号处理不一样。点云不是函数，对于复杂三维外形其x,y,z之间并非以某种规律或某种数值关系定义，而依赖于几何信息。这是三位点云滤波器源码，可直接下载使用
(Point cloud filtering is the basic step of point cloud processing, and also the pre-processing before high level 3D image processing. Its function is similar to the filtering in signal processing, but its realization means is different from that of signal processing. The point cloud is not a function. For complex three-dimensional shape, its X, y, Z are not defined by a certain law or some numerical relationship, but depend on the geometric information. This is the source code of three point cloud filter, which can be downloaded directly)