itkLevelSetEquationLaplacianTerm.h

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 *  Copyright Insight Software Consortium
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 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
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 *         http://www.apache.org/licenses/LICENSE-2.0.txt
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 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
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#ifndef __itkLevelSetEquationLaplacianTerm_h
#define __itkLevelSetEquationLaplacianTerm_h

#include "itkLevelSetEquationTermBase.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
#include "itkConstNeighborhoodIterator.h"
#include "itkVector.h"
#include "vnl/vnl_matrix_fixed.h"

namespace itk
{
template< class TInput, // Input image or mesh
          class TLevelSetContainer >
class LevelSetEquationLaplacianTerm :
    public LevelSetEquationTermBase< TInput, TLevelSetContainer >
{
public:
  typedef LevelSetEquationLaplacianTerm         Self;
  typedef SmartPointer< Self >                  Pointer;
  typedef SmartPointer< const Self >            ConstPointer;
  typedef LevelSetEquationTermBase< TInput, TLevelSetContainer >
                                                Superclass;

  itkNewMacro( Self );

  itkTypeMacro( LevelSetEquationLaplacianTerm,
                LevelSetEquationTermBase );

  typedef typename Superclass::InputImageType     InputImageType;
  typedef typename Superclass::InputImagePointer  InputImagePointer;
  typedef typename Superclass::InputPixelType     InputPixelType;
  typedef typename Superclass::InputPixelRealType InputPixelRealType;

  typedef typename Superclass::LevelSetContainerType      LevelSetContainerType;
  typedef typename Superclass::LevelSetContainerPointer   LevelSetContainerPointer;
  typedef typename Superclass::LevelSetType               LevelSetType;
  typedef typename Superclass::LevelSetPointer            LevelSetPointer;
  typedef typename Superclass::LevelSetOutputPixelType    LevelSetOutputPixelType;
  typedef typename Superclass::LevelSetOutputRealType     LevelSetOutputRealType;
  typedef typename Superclass::LevelSetInputIndexType     LevelSetInputIndexType;
  typedef typename Superclass::LevelSetGradientType       LevelSetGradientType;
  typedef typename Superclass::LevelSetHessianType        LevelSetHessianType;
  typedef typename Superclass::LevelSetIdentifierType     LevelSetIdentifierType;

  typedef typename Superclass::HeavisideType         HeavisideType;
  typedef typename Superclass::HeavisideConstPointer HeavisideConstPointer;

  typedef typename Superclass::LevelSetDataType LevelSetDataType;

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

  typedef ZeroFluxNeumannBoundaryCondition< InputImageType > DefaultBoundaryConditionType;
  typedef typename ConstNeighborhoodIterator< InputImageType >::RadiusType RadiusType;
  typedef ConstNeighborhoodIterator< InputImageType, DefaultBoundaryConditionType > NeighborhoodType;

  typedef Vector< LevelSetOutputRealType, itkGetStaticConstMacro(ImageDimension) > NeighborhoodScalesType;

  virtual void Update();

  virtual void InitializeParameters();

  virtual void Initialize( const LevelSetInputIndexType& );

  virtual void UpdatePixel( const LevelSetInputIndexType& iP,
                            const LevelSetOutputRealType& oldValue,
                            const LevelSetOutputRealType& newValue );

protected:
  LevelSetEquationLaplacianTerm();

  virtual ~LevelSetEquationLaplacianTerm();

  LevelSetOutputRealType LaplacianSpeed( const LevelSetInputIndexType& iP ) const;

  virtual LevelSetOutputRealType Value( const LevelSetInputIndexType& iP );

  virtual LevelSetOutputRealType Value( const LevelSetInputIndexType& iP,
                                        const LevelSetDataType& iData );

private:
  LevelSetEquationLaplacianTerm( const Self& ); // purposely not implemented
  void operator = ( const Self& ); // purposely not implemented
};

}
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLevelSetEquationLaplacianTerm.hxx"
#endif
#endif