M.anisotropic_diffusion.hdev例程相关学习（不规则扩散平滑）

 index:...filters/smoothing/anisotropic_diffusion.hdev
做平滑用的算子之一，特点就是平滑后仍能保留边缘。Smooth an image using edge-preserving anisotropic diffusion

* Perform the anisotropic diffusion using the parabolic edge detection function.

* Note that this function still allows a slight diffusion (smoothing) across edges.

anisotropic_diffusion (Image, ImageParabolic, 'parabolic', 3, 1, 10)

* Perform the anisotropic diffusion using the Perona-Malik edge detection

* function.  Note that this function sharpens edges very slightly.

anisotropic_diffusion (Image, ImagePeronaMalik, 'perona-malik', 5, 1, 10)

* Perform the anisotropic diffusion using the Weickert edge detection function.

* Note that this function sharpens edges significantly.

anisotropic_diffusion (Image, ImageWeickert, 'weickert', 6, 1, 10)

  u_t = div(g(|grad u|^2, c) grad u)
  g_1(x,c) = 1/sqrt( 1 + 2*x/c^2 )
我在里面看到了这么两个partial differential equation
还得等Ds回来求解一下，不过图像处理数学都不难。但是u_0是初始值，由图像的灰度图得出来的，然后和上面步长是1，迭代10次那样，迭代，手边没有数值分析的书，不然可以看一下partial differential equation的迭代求解数学含义。