itkFiniteDifferenceImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkFiniteDifferenceImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2003/11/26 12:23:12 $
  Version:   $Revision: 1.25 $

  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;

  typedef enum { UNINITIALIZED = 0, INITIALIZED = 1 } FilterStateType;
  
  itkGetConstMacro(ElapsedIterations, unsigned int);

  itkGetConstReferenceObjectMacro(DifferenceFunction,
                                  FiniteDifferenceFunctionType );

  itkSetObjectMacro(DifferenceFunction, FiniteDifferenceFunctionType );


  itkSetMacro(NumberOfIterations, unsigned int);
  itkGetMacro(NumberOfIterations, unsigned int);

  itkSetMacro(MaximumRMSError, double);
  itkGetMacro(MaximumRMSError, double);

  itkSetMacro(RMSChange, double);
  itkGetMacro(RMSChange, double);

  void SetStateToInitialized()
  {
    this->SetState(INITIALIZED);
  }

  void SetStateToUninitialized()
  {
    this->SetState(UNINITIALIZED);
  }
  
  itkSetMacro(State, FilterStateType);
  itkGetMacro(State, FilterStateType);

  itkSetMacro(ManualReinitialization, bool);
  itkGetMacro(ManualReinitialization, bool);
  itkBooleanMacro(ManualReinitialization);
  
protected:
  FiniteDifferenceImageFilter()
  {
    m_ElapsedIterations  = 0;
    m_DifferenceFunction = 0;
    m_NumberOfIterations = NumericTraits<unsigned int>::max();
    m_MaximumRMSError = 0.0;
    m_RMSChange = 0.0;
    m_State = UNINITIALIZED;
    m_ManualReinitialization = false;
  }
  ~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();

  virtual bool ThreadedHalt(void *itkNotUsed(threadInfo)) { return this->Halt(); }

  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() {}

  unsigned int  m_NumberOfIterations;

  double m_RMSChange;  
  double m_MaximumRMSError;

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

  unsigned int m_ElapsedIterations;

  bool m_ManualReinitialization;
  
  typename FiniteDifferenceFunctionType::Pointer m_DifferenceFunction;

  FilterStateType m_State;
};
  
}// end namespace itk

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

#endif

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