图像处理，对源图像进行扭曲，采用最近邻、二维插值和三次样条插值。-Image processing, image distortion source, using the nearest neighbor, the two-dimensional interpolation and cubic spline interpolation.

利用matlab实现k-近邻点估计点云法向量求解，(Matlab is used to solve the normal vector of k-nearest neighbor point cloud.)