itkCorrelationCoefficientHistogramImageToImageMetric.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkCorrelationCoefficientHistogramImageToImageMetric.h,v $
  Language:  C++
  Date:      $Date: 2008-10-23 16:15:23 $
  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 __itkCorrelationCoefficientHistogramImageToImageMetric_h
#define __itkCorrelationCoefficientHistogramImageToImageMetric_h

#include "itkHistogramImageToImageMetric.h"

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

  itkNewMacro(Self);

  itkTypeMacro(CorrelationCoefficientHistogramImageToImageMetric,
    HistogramImageToImageMetric);

  typedef typename Superclass::RealType                RealType;
  typedef typename Superclass::TransformType           TransformType;
  typedef typename Superclass::TransformPointer        TransformPointer;
  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 HistogramType::FrequencyType HistogramFrequencyType;
  typedef typename HistogramType::Iterator      HistogramIteratorType;
  typedef typename HistogramType::MeasurementVectorType
                                                HistogramMeasurementVectorType;

protected:
  CorrelationCoefficientHistogramImageToImageMetric(){}
  virtual ~CorrelationCoefficientHistogramImageToImageMetric(){}

  virtual MeasureType EvaluateMeasure(HistogramType& histogram) const;

private:
  MeasureType MeanX(HistogramType& histogram) const;

  MeasureType MeanY(HistogramType& histogram) const;

  MeasureType VarianceX(HistogramType& histogram) const;

  MeasureType VarianceY(HistogramType& histogram) const;

  MeasureType Covariance(HistogramType& histogram) const;

  // Purposely not implemented.
  CorrelationCoefficientHistogramImageToImageMetric(Self const&); 
  void operator=(Self const&); // Purposely not implemented.
};

} // End namespace itk.

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

#endif // __itkCorrelationCoefficientHistogramImageToImageMetric_h

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