itkNMILocalHistogramDerivativeForceFilter.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 itkNMILocalHistogramDerivativeForceFilter_h
#define itkNMILocalHistogramDerivativeForceFilter_h

#include "itkLocalHistogramDerivativeForceFilter.h"

namespace itk {
template< class TFixedImage, class TMovingImage, class TScalar >
class ITK_EXPORT NMILocalHistogramDerivativeForceFilter :
  public LocalHistogramDerivativeForceFilter<TFixedImage, TMovingImage, TScalar>
{
public:

  typedef NMILocalHistogramDerivativeForceFilter                         Self;
  typedef LocalHistogramDerivativeForceFilter<TFixedImage, TMovingImage, TScalar> Superclass;
  typedef SmartPointer<Self>                                             Pointer;
  typedef SmartPointer<const Self>                                       ConstPointer;
  typedef typename Superclass::MeasureType                               MeasureType;
  
  itkNewMacro(Self);

  itkTypeMacro(NMILocalHistogramDerivativeForceFilter, LocalHistogramDerivativeForceFilter);

protected:
  
  NMILocalHistogramDerivativeForceFilter() {};
  ~NMILocalHistogramDerivativeForceFilter() {};

  MeasureType ComputeForcePerVoxel(double totalFrequency, 
                                   double jointEntropy, 
                                   double fixedImageEntropy, 
                                   double transformedMovingImageEntropy, 
                                   double transformedMovingImageMinusHistogramIndexJointFrequency,
                                   double transformedMovingImagePlusHistogramIndexJointFrequency,
                                   double transformedMovingImageMinusHistogramIndexFrequency,
                                   double transformedMovingImagePlusHistogramIndexFrequency) const
    {
      
      double result = (1.0/(jointEntropy*jointEntropy*totalFrequency))*
               ((fixedImageEntropy+transformedMovingImageEntropy)*vcl_log(transformedMovingImageMinusHistogramIndexJointFrequency/transformedMovingImagePlusHistogramIndexJointFrequency) - 
                (jointEntropy*vcl_log(transformedMovingImageMinusHistogramIndexFrequency/transformedMovingImagePlusHistogramIndexFrequency)));

      /*
      std::cerr << totalFrequency << "," \
                << jointEntropy << "," \
                << fixedImageEntropy << "," \
                << transformedMovingImageEntropy << "," \
                << transformedMovingImageMinusHistogramIndexJointFrequency << "," \
                << transformedMovingImagePlusHistogramIndexJointFrequency << "," \
                << transformedMovingImageMinusHistogramIndexFrequency << "," \
                << transformedMovingImagePlusHistogramIndexFrequency << "," \
                << result << std::endl;
      */
      
      return result;
    }


private:

  NMILocalHistogramDerivativeForceFilter(const Self&); 
  void operator=(const Self&); 

};

} // end namespace

#endif