itkVectorCurvatureAnisotropicDiffusionImageFilter.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkVectorCurvatureAnisotropicDiffusionImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-17 16:30:54 $
  Version:   $Revision: 1.19 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkVectorCurvatureAnisotropicDiffusionImageFilter_h
#define __itkVectorCurvatureAnisotropicDiffusionImageFilter_h

#include "itkExceptionObject.h"
#include "itkAnisotropicDiffusionImageFilter.h"
#include "itkVectorCurvatureNDAnisotropicDiffusionFunction.h"

namespace itk {

template <class TInputImage, class TOutputImage>
class ITK_EXPORT VectorCurvatureAnisotropicDiffusionImageFilter
  : public AnisotropicDiffusionImageFilter<TInputImage, TOutputImage>
{
public:
  typedef VectorCurvatureAnisotropicDiffusionImageFilter Self;
  typedef AnisotropicDiffusionImageFilter<TInputImage, TOutputImage>
                                                         Superclass;
  typedef SmartPointer<Self>                             Pointer;
  typedef SmartPointer<const Self>                       ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(VectorCurvatureAnisotropicDiffusionImageFilter,
               AnisotropicDiffusionImageFilter);

  typedef typename Superclass::UpdateBufferType UpdateBufferType;

  itkStaticConstMacro(ImageDimension, unsigned int,
                      Superclass::ImageDimension );

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(InputHasNumericTraitsCheck,
    (Concept::HasNumericTraits<typename TInputImage::PixelType::ValueType>));
  itkConceptMacro(OutputHasNumericTraitsCheck,
    (Concept::HasNumericTraits<typename TOutputImage::PixelType::ValueType>));

#endif

protected:
  VectorCurvatureAnisotropicDiffusionImageFilter()
    {
    typename VectorCurvatureNDAnisotropicDiffusionFunction<UpdateBufferType>::Pointer q
      = VectorCurvatureNDAnisotropicDiffusionFunction<UpdateBufferType>::New();
    this->SetDifferenceFunction(q);
    }
  ~VectorCurvatureAnisotropicDiffusionImageFilter() {}

  virtual void InitializeIteration()
    {
    Superclass::InitializeIteration();
    if (this->GetTimeStep() >  0.5 / vcl_pow(2.0, static_cast<double>(ImageDimension))  )
      {
      itkWarningMacro(<< "Anisotropic diffusion has attempted to use a time step which may introduce instability into the solution." );
      }
    }
  
private:
  VectorCurvatureAnisotropicDiffusionImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
};

} // end namspace itk

#endif

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