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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    itkMeanSquaresHistogramImageToImageMetric.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  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 __itkMeanSquaresHistogramImageToImageMetric_h
#define __itkMeanSquaresHistogramImageToImageMetric_h

#include "itkHistogramImageToImageMetric.h"

namespace itk
{
/** \class MeanSquaresHistogramImageToImageMetric
 * \brief Computes mean squared difference similarity measure between
 * two images to be registered.
 *
 * This class is templated over the type of the fixed and moving
 * images to be compared.
 *
 * This metric computes the similarity measure between pixels in the
 * moving image and pixels in the fixed images using a histogram. 
 *
 *    \ingroup RegistrationMetrics */
template <class TFixedImage, class TMovingImage>
class ITK_EXPORT MeanSquaresHistogramImageToImageMetric :
public HistogramImageToImageMetric<TFixedImage, TMovingImage>
{
public:
  /** Standard class typedefs. */
  typedef MeanSquaresHistogramImageToImageMetric                 Self;
  typedef HistogramImageToImageMetric<TFixedImage, TMovingImage> Superclass;
  typedef SmartPointer<Self>                                     Pointer;
  typedef SmartPointer<const Self>                               ConstPointer;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Run-time type information (and related methods). */
  itkTypeMacro(MeanSquaresHistogramImageToImageMetric,
    HistogramImageToImageMetric);

  /** Types transferred from the base class */
  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;
#ifdef ITK_USE_REVIEW_STATISTICS
  typedef typename HistogramType::AbsoluteFrequencyType         HistogramFrequencyType;
#else
  typedef typename HistogramType::FrequencyType         HistogramFrequencyType;
#endif
  typedef typename HistogramType::Iterator              HistogramIteratorType;
  typedef typename HistogramType::MeasurementVectorType HistogramMeasurementVectorType;

protected:
  /** Constructor is protected to ensure that \c New() function is used to
      create instances. */
  MeanSquaresHistogramImageToImageMetric(){}
  virtual ~MeanSquaresHistogramImageToImageMetric(){}
  
  /** Evaluates the sum of squared differences from the histogram. */
  virtual MeasureType EvaluateMeasure(HistogramType& histogram) const;

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

} // End namespace itk.

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

#endif // __itkMeanSquaresHistogramImageToImageMetric_h