itkFiniteDifferenceImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkFiniteDifferenceImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2003/09/10 14:29:07 $
  Version:   $Revision: 1.22 $

  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 __itkFiniteDifferenceImageFilter_h_
#define __itkFiniteDifferenceImageFilter_h_

#include "itkImageToImageFilter.h"
#include "itkFiniteDifferenceFunction.h"

namespace itk {

template <class TInputImage, class TOutputImage>
class ITK_EXPORT FiniteDifferenceImageFilter  
  : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  typedef FiniteDifferenceImageFilter Self;
  typedef ImageToImageFilter<TInputImage, TOutputImage> Superclass;
  typedef SmartPointer<Self>  Pointer;
  typedef SmartPointer<const Self>  ConstPointer;
  
  itkTypeMacro(FiniteDifferenceImageFilter, ImageToImageFilter );
  
  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;
  
  itkStaticConstMacro(ImageDimension, unsigned int,
                      OutputImageType::ImageDimension);

  typedef typename TOutputImage::PixelType PixelType;

  typedef FiniteDifferenceFunction<TOutputImage> FiniteDifferenceFunctionType;
  typedef typename FiniteDifferenceFunctionType::TimeStepType TimeStepType;
    
  itkGetConstMacro(ElapsedIterations, unsigned int);

  itkGetConstReferenceObjectMacro(DifferenceFunction,
                                  FiniteDifferenceFunctionType );

  itkSetObjectMacro(DifferenceFunction, FiniteDifferenceFunctionType );

protected:
  FiniteDifferenceImageFilter() : m_ElapsedIterations(0) {m_DifferenceFunction = 0;}
  ~FiniteDifferenceImageFilter() {}
  void PrintSelf(std::ostream& os, Indent indent) const;

  virtual void AllocateUpdateBuffer() = 0;

  virtual void ApplyUpdate(TimeStepType dt) = 0;
  
  virtual TimeStepType CalculateChange() = 0;

  virtual void CopyInputToOutput() = 0;
  
  virtual void GenerateData();

  virtual void GenerateInputRequestedRegion();
  
  virtual bool Halt() = 0;
  virtual void Initialize() { };

  virtual void InitializeIteration()
    { m_DifferenceFunction->InitializeIteration(); }
  
  virtual TimeStepType ResolveTimeStep(const TimeStepType* timeStepList, 
                                       const bool* valid,int size);

  itkSetMacro(ElapsedIterations, unsigned int);

  virtual void PostProcessOutput() {}
  
private:
  FiniteDifferenceImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  unsigned int m_ElapsedIterations;

  typename FiniteDifferenceFunctionType::Pointer m_DifferenceFunction;
};
  
}// end namespace itk

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

#endif

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