itkNMIImageToImageMetric.h

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

  NifTK: A software platform for medical image computing.

  Copyright (c) University College London (UCL). All rights reserved.

  This software is distributed WITHOUT ANY WARRANTY; without even
  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  PURPOSE.

  See LICENSE.txt in the top level directory for details.

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

#ifndef itkNMIImageToImageMetric_h
#define itkNMIImageToImageMetric_h

#include "itkHistogramSimilarityMeasure.h"

namespace itk
{
template < class TFixedImage, class TMovingImage > 
class ITK_EXPORT NMIImageToImageMetric : 
    public HistogramSimilarityMeasure< TFixedImage, TMovingImage>
{
public:

  typedef NMIImageToImageMetric                                           Self;
  typedef HistogramSimilarityMeasure<TFixedImage, TMovingImage >          Superclass;
  typedef SmartPointer<Self>                                              Pointer;
  typedef SmartPointer<const Self>                                        ConstPointer;
  typedef typename Superclass::FixedImageType::PixelType                  FixedImagePixelType;
  typedef typename Superclass::MovingImageType::PixelType                 MovingImagePixelType;  
  typedef typename Superclass::MeasureType                                MeasureType; 
  
  itkNewMacro(Self);
 
  itkTypeMacro(NMIImageToImageMetric, HistogramSimilarityMeasure);

  bool ShouldBeMaximized() { return true; };

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

  MeasureType FinalizeCostFunction()
    {
      //printf("Matt: Filled histogram has %f in total\n",  this->m_Histogram->GetTotalFrequency());
      return (this->EntropyFixed() + this->EntropyMoving()) / this->JointEntropy();
    }

private:
  NMIImageToImageMetric(const Self&); // purposefully not implemented
  void operator=(const Self&);        // purposefully not implemented    
};

} // end namespace itk

#endif