各向异性算法，维持细节的基础上平滑图像，非常好用-Function to perform anisotropic diffusion of an image following Perona and Malik s algorithm. This process smoothes regions while preserving, and enhancing, the contrast at sharp intensity gradients.

Anisotropic Diffusion Filter to C, Scale-Space and Edge Detection using Anisotropic Diffusion Pietro Perona and Jitendra Malik IEEE Transactions on Pattern Analysis and Machine Intelligence, VOL. 12, NO. 7, JULY 1990