itkGradientNDAnisotropicDiffusionFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGradientNDAnisotropicDiffusionFunction.h,v $
  Language:  C++
  Date:      $Date: 2008-10-16 16:45:08 $
  Version:   $Revision: 1.17 $

  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 __itkGradientNDAnisotropicDiffusionFunction_h
#define __itkGradientNDAnisotropicDiffusionFunction_h

#include "itkScalarAnisotropicDiffusionFunction.h"
#include "itkNeighborhoodAlgorithm.h"
#include "itkNeighborhoodInnerProduct.h"
#include "itkDerivativeOperator.h"

namespace itk {

template <class TImage>
class ITK_EXPORT GradientNDAnisotropicDiffusionFunction :
    public ScalarAnisotropicDiffusionFunction<TImage>
{
public:
  typedef GradientNDAnisotropicDiffusionFunction     Self;
  typedef ScalarAnisotropicDiffusionFunction<TImage> Superclass;
  typedef SmartPointer<Self>                         Pointer;
  typedef SmartPointer<const Self>                   ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro( GradientNDAnisotropicDiffusionFunction,
                ScalarAnisotropicDiffusionFunction );

  typedef typename Superclass::ImageType        ImageType;
  typedef typename Superclass::PixelType        PixelType;
  typedef typename Superclass::PixelRealType    PixelRealType;
  typedef typename Superclass::TimeStepType     TimeStepType;
  typedef typename Superclass::RadiusType       RadiusType;
  typedef typename Superclass::NeighborhoodType NeighborhoodType;
  typedef typename Superclass::FloatOffsetType  FloatOffsetType;

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

  virtual PixelType ComputeUpdate(const NeighborhoodType &neighborhood,
                                  void *globalData,
                                  const FloatOffsetType& offset = FloatOffsetType(0.0)
    );

  virtual void InitializeIteration()
    {
    m_K = static_cast<PixelType>(this->GetAverageGradientMagnitudeSquared() *
                                 this->GetConductanceParameter() * this->GetConductanceParameter() * -2.0f);
    }

protected:
  GradientNDAnisotropicDiffusionFunction();
  ~GradientNDAnisotropicDiffusionFunction() {}

  NeighborhoodInnerProduct<ImageType> m_InnerProduct;

  std::slice  x_slice[ImageDimension];
  std::slice xa_slice[ImageDimension][ImageDimension];
  std::slice xd_slice[ImageDimension][ImageDimension];

  DerivativeOperator<PixelType, itkGetStaticConstMacro(ImageDimension)> dx_op;

  PixelType m_K;

  unsigned long m_Center;
  unsigned long m_Stride[ImageDimension];

  static double m_MIN_NORM;
  
private:
  GradientNDAnisotropicDiffusionFunction(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};
  
}// end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkGradientNDAnisotropicDiffusionFunction.txx"
#endif

#endif