itkCorrelationCoefficientHistogramImageToImageMetric.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkCorrelationCoefficientHistogramImageToImageMetric_h
#define itkCorrelationCoefficientHistogramImageToImageMetric_h

#include "itkHistogramImageToImageMetric.h"

namespace itk
{
template< typename TFixedImage, typename TMovingImage >
class 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::AbsoluteFrequencyType HistogramAbsoluteFrequencyType;
  typedef HistogramAbsoluteFrequencyType                HistogramFrequencyType;

  typedef typename HistogramType::Iterator HistogramIteratorType;
  typedef typename HistogramType::MeasurementVectorType
  HistogramMeasurementVectorType;

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

  virtual MeasureType EvaluateMeasure(HistogramType & histogram) const ITK_OVERRIDE;

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.hxx"
#endif

#endif // itkCorrelationCoefficientHistogramImageToImageMetric_h