Mean filter + Gaussian smoothing + median filter + anisotropic filtering

51CTO Explanation:
Mean value filter: http://book.51cto.com/art/201504/474128.htm
Gaussian Smoothing: http://book.51cto.com/art/201504/474129.htm
Median filter: http://book.51cto.com/art/201504/474130.htm
Anisotropic filtering: http://book.51cto.com/art/201504/474131.htm

Demo Address:
Mean value filter: https://lorensen.github.io/VTKExamples/site/Cxx/Images/ImageConvolve/
Gaussian Smoothing: https://lorensen.github.io/VTKExamples/site/Cxx/Images/ImageGaussianSmooth/
Median filter: https://lorensen.github.io/VTKExamples/site/Cxx/Images/ImageHybridMedian2D/
Anisotropic filtering: https://lorensen.github.io/VTKExamples/site/Cxx/Images/ImageAnisotropicDiffusion2D/

Mean filter Key code:

  vtksmartpointer<vtkimageconvolve> convolvefilter =
    vtksmartpointer<vtkimageconvolve>::new ();
  Convolvefilter->setinputconnection (Source->getoutputport ());
  Double Kernel[9] = {1,1,1,1,1,1,1,1,1};
  CONVOLVEFILTER->SETKERNEL3X3 (kernel);
  Convolvefilter->update ();

Effect Diagram:

Gaussian smoothing Key code:

  vtksmartpointer<vtkimagegaussiansmooth> Gaussiansmoothfilter = 
    vtksmartpointer< Vtkimagegaussiansmooth>::new ();
  Gaussiansmoothfilter->setinputconnection (Source->getoutputport ());
  Gaussiansmoothfilter->update ();

Effect Diagram:

Median filter Key code:

  vtksmartpointer<vtkimagehybridmedian2d> Hybridmedian =
    vtksmartpointer<vtkimagehybridmedian2d>:: New ();
  Hybridmedian->setinputconnection (Reader->getoutputport ());

Effect Diagram:

Anisotropic filtering Key code:

  vtksmartpointer<vtkimageanisotropicdiffusion2d> diffusion =
    vtksmartpointer< Vtkimageanisotropicdiffusion2d>::new ();
  Diffusion->setinputconnection (Reader->getoutputport ());
  Diffusion->setnumberofiterations (iterations);
  Diffusion->setdiffusionthreshold (threshold);
  Diffusion->update ();

Effect Diagram: