itkKullbackLeiblerCompareHistogramImageToImageMetric.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkKullbackLeiblerCompareHistogramImageToImageMetric.h,v $
  Language:  C++
  Date:      $Date: 2004/12/21 22:47:26 $
  Version:   $Revision: 1.4 $

  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 __itkKullbackLeiblerCompareHistogramImageToImageMetric_h
#define __itkKullbackLeiblerCompareHistogramImageToImageMetric_h

#include "itkCompareHistogramImageToImageMetric.h"

namespace itk
{
template <class TFixedImage, class TMovingImage>
class ITK_EXPORT KullbackLeiblerCompareHistogramImageToImageMetric :
public CompareHistogramImageToImageMetric<TFixedImage, TMovingImage>
{
 public:
  typedef KullbackLeiblerCompareHistogramImageToImageMetric Self;
  typedef CompareHistogramImageToImageMetric<TFixedImage, TMovingImage> Superclass;
  typedef SmartPointer<Self>                                     Pointer;
  typedef SmartPointer<const Self>                               ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(KullbackLeiblerCompareHistogramImageToImageMetric,
    HistogramImageToImageMetric);

  typedef typename Superclass::RealType                 RealType;
  typedef typename Superclass::TransformType            TransformType;
  typedef typename Superclass::TransformPointer         TransformPointer;
  typedef typename Superclass::ConstPointer             TransformConstPointer;
  typedef typename Superclass::TransformParametersType
    TransformParametersType;
  typedef typename Superclass::TransformJacobianType    TransformJacobianType;
  typedef typename Superclass::GradientPixelType        GradientPixelType;

  typedef typename Superclass::MeasureType              MeasureType;
  typedef typename Superclass::DerivativeType           DerivativeType;
  typedef typename Superclass::FixedImageType           FixedImageType;
  typedef typename Superclass::MovingImageType          MovingImageType;
  typedef typename Superclass::FixedImageConstPointer   FixedImageConstPointer;
  typedef typename Superclass::MovingImageConstPointer
    MovingImageConstPointer;

  typedef typename Superclass::HistogramType            HistogramType;
  typedef typename Superclass::HistogramSizeType        HistogramSizeType;
  typedef typename Superclass::MeasurementVectorType
    HistogramMeasurementVectorType;

  typedef typename Superclass::HistogramFrequencyType   HistogramFrequencyType;
  typedef typename Superclass::HistogramIteratorType    HistogramIteratorType;
  typedef typename Superclass::HistogramPointerType     HistogramPointerType;
  typedef typename Superclass::InterpolatorType         InterpolatorType;
  typedef typename Superclass::InterpolatorPointer      InterpolatorPointer;

  itkSetMacro( Epsilon, double );

  itkGetConstReferenceMacro( Epsilon, double );

  unsigned int GetNumberOfParameters(void) const 
  { return this->GetTransform()->GetNumberOfParameters(); }
 
  void Initialize() throw (ExceptionObject);

protected:
  KullbackLeiblerCompareHistogramImageToImageMetric();
  virtual ~KullbackLeiblerCompareHistogramImageToImageMetric(){}
  void PrintSelf(std::ostream& os, Indent indent) const;

  void FormTrainingHistogram() throw (ExceptionObject);

  virtual MeasureType EvaluateMeasure(HistogramType& histogram) const;

  double                  m_Epsilon;

private:
  // Purposely not implemented.
  KullbackLeiblerCompareHistogramImageToImageMetric(Self const&);
  void operator=(Self const&); // Purposely not implemented.
};

} // End namespace itk.

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

#endif // __itkKullbackLeiblerCompareHistogramImageToImageMetric_h

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