itkOptMattesMutualInformationImageToImageMetric.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkOptMattesMutualInformationImageToImageMetric.h,v $
  Language:  C++
  Date:      $Date: 2008-04-03 12:34:38 $
  Version:   $Revision: 1.6 $

  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 __itkOptMattesMutualInformationImageToImageMetric_h
#define __itkOptMattesMutualInformationImageToImageMetric_h

#include "itkOptImageToImageMetric.h"
#include "itkCovariantVector.h"
#include "itkPoint.h"
#include "itkIndex.h"
#include "itkBSplineKernelFunction.h"
#include "itkBSplineDerivativeKernelFunction.h"
#include "itkCentralDifferenceImageFunction.h"
#include "itkBSplineInterpolateImageFunction.h"
#include "itkBSplineDeformableTransform.h"
#include "itkArray2D.h"

#include "itkMultiThreader.h"

namespace itk
{

template <class TFixedImage,class TMovingImage >
class ITK_EXPORT MattesMutualInformationImageToImageMetric :
    public ImageToImageMetric< TFixedImage, TMovingImage >
{
public:

  typedef MattesMutualInformationImageToImageMetric           Self;
  typedef ImageToImageMetric< TFixedImage, TMovingImage >     Superclass;
  typedef SmartPointer<Self>                                  Pointer;
  typedef SmartPointer<const Self>                            ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(MattesMutualInformationImageToImageMetric,
               ImageToImageMetric);

  typedef typename Superclass::TransformType            TransformType;
  typedef typename Superclass::TransformPointer         TransformPointer;
  typedef typename Superclass::TransformJacobianType    TransformJacobianType;
  typedef typename Superclass::InterpolatorType         InterpolatorType;
  typedef typename Superclass::MeasureType              MeasureType;
  typedef typename Superclass::DerivativeType           DerivativeType;
  typedef typename Superclass::ParametersType           ParametersType;
  typedef typename Superclass::FixedImageType           FixedImageType;
  typedef typename Superclass::MovingImageType          MovingImageType;
  typedef typename Superclass::MovingImagePointType     MovingImagePointType;
  typedef typename Superclass::FixedImageConstPointer   FixedImageConstPointer;
  typedef typename Superclass::MovingImageConstPointer  MovingImageConstPointer;
  typedef typename Superclass::BSplineTransformWeightsType
                                                        BSplineTransformWeightsType;
  typedef typename Superclass::BSplineTransformIndexArrayType
                                                        BSplineTransformIndexArrayType;

  typedef typename Superclass::CoordinateRepresentationType
                                                   CoordinateRepresentationType;
  typedef typename Superclass::FixedImageSampleContainer   
                                                      FixedImageSampleContainer;
  typedef typename Superclass::ImageDerivativesType     ImageDerivativesType;
  typedef typename Superclass::WeightsValueType         WeightsValueType;
  typedef typename Superclass::IndexValueType           IndexValueType;

  itkStaticConstMacro( MovingImageDimension, unsigned int,
                       MovingImageType::ImageDimension );

  virtual void Initialize(void) throw ( ExceptionObject );

  MeasureType GetValue( const ParametersType & parameters ) const;

  void GetDerivative( const ParametersType & parameters,
                      DerivativeType & Derivative ) const;

  void GetValueAndDerivative( const ParametersType & parameters, 
                              MeasureType & Value,
                              DerivativeType & Derivative ) const;

  itkSetClampMacro( NumberOfHistogramBins, unsigned long,
                    1, NumericTraits<unsigned long>::max() );
  itkGetConstReferenceMacro( NumberOfHistogramBins, unsigned long);   

  itkSetMacro(UseExplicitPDFDerivatives,bool);
  itkGetConstReferenceMacro(UseExplicitPDFDerivatives,bool);
  itkBooleanMacro(UseExplicitPDFDerivatives);

protected:

  MattesMutualInformationImageToImageMetric();
  virtual ~MattesMutualInformationImageToImageMetric();
  void PrintSelf(std::ostream& os, Indent indent) const;

private:

  //purposely not implemented
  MattesMutualInformationImageToImageMetric(const Self &); 
  //purposely not implemented
  void operator=(const Self &); 


  typedef float                       PDFValueType;
  typedef float *                     MarginalPDFType;

  mutable MarginalPDFType             m_FixedImageMarginalPDF;

  mutable MarginalPDFType             m_MovingImageMarginalPDF;

  typedef double                      PRatioType;
  typedef Array2D< PRatioType >       PRatioArrayType;
  mutable PRatioArrayType             m_PRatioArray;

  mutable DerivativeType              m_MetricDerivative;
  mutable DerivativeType            * m_ThreaderMetricDerivative;

  typedef Image<PDFValueType,2>                 JointPDFType;
  typedef Image<PDFValueType,3>                 JointPDFDerivativesType;
  typedef JointPDFType::IndexType               JointPDFIndexType;
  typedef JointPDFType::PixelType               JointPDFValueType;
  typedef JointPDFType::RegionType              JointPDFRegionType;
  typedef JointPDFType::SizeType                JointPDFSizeType;
  typedef JointPDFDerivativesType::IndexType    JointPDFDerivativesIndexType;
  typedef JointPDFDerivativesType::PixelType    JointPDFDerivativesValueType;
  typedef JointPDFDerivativesType::RegionType   JointPDFDerivativesRegionType;
  typedef JointPDFDerivativesType::SizeType     JointPDFDerivativesSizeType;

  typename JointPDFType::Pointer                m_JointPDF;
  unsigned long                                 m_JointPDFBufferSize;
  typename JointPDFDerivativesType::Pointer     m_JointPDFDerivatives;
  unsigned long                                 m_JointPDFDerivativesBufferSize;

  unsigned long  m_NumberOfHistogramBins;
  double         m_MovingImageNormalizedMin;
  double         m_FixedImageNormalizedMin;
  double         m_FixedImageTrueMin;
  double         m_FixedImageTrueMax;
  double         m_MovingImageTrueMin;
  double         m_MovingImageTrueMax;
  double         m_FixedImageBinSize;
  double         m_MovingImageBinSize;

  typedef BSplineKernelFunction<3>           CubicBSplineFunctionType;
  typedef BSplineDerivativeKernelFunction<3> CubicBSplineDerivativeFunctionType;

  typename CubicBSplineFunctionType::Pointer   m_CubicBSplineKernel;
  typename CubicBSplineDerivativeFunctionType::Pointer   
                                               m_CubicBSplineDerivativeKernel;

  virtual void ComputeFixedImageParzenWindowIndices( 
                                         FixedImageSampleContainer & samples );

  virtual void ComputePDFDerivatives( unsigned int threadID,
                                      unsigned int sampleNumber,
                                      int movingImageParzenWindowIndex,
                                      const ImageDerivativesType
                                              &  movingImageGradientValue,
                                      double cubicBSplineDerivativeValue 
                                      ) const;

  PDFValueType                                * m_ThreaderFixedImageMarginalPDF;
  typename JointPDFType::Pointer              * m_ThreaderJointPDF;
  typename JointPDFDerivativesType::Pointer   * m_ThreaderJointPDFDerivatives;
  int                                         * m_ThreaderJointPDFStartBin;
  int                                         * m_ThreaderJointPDFEndBin;
  mutable double                              * m_ThreaderJointPDFSum;
  mutable double                                m_JointPDFSum;

  bool                                          m_UseExplicitPDFDerivatives;
  mutable bool                                  m_ImplicitDerivativesSecondPass;


  inline void GetValueThreadPreProcess( unsigned int threadID,
                                        bool withinSampleThread ) const;
  inline bool GetValueThreadProcessSample( unsigned int threadID,
                                       unsigned long fixedImageSample,
                                       const MovingImagePointType & mappedPoint,
                                       double movingImageValue ) const;
  inline void GetValueThreadPostProcess( unsigned int threadID,
                                        bool withinSampleThread ) const;

  inline void GetValueAndDerivativeThreadPreProcess( 
                                       unsigned int threadID,
                                       bool withinSampleThread ) const;
  inline bool GetValueAndDerivativeThreadProcessSample( unsigned int threadID,
                                       unsigned long fixedImageSample,
                                       const MovingImagePointType & mappedPoint,
                                       double movingImageValue,
                                       const ImageDerivativesType &
                                               movingImageGradientValue ) const;
  inline void GetValueAndDerivativeThreadPostProcess( 
                                       unsigned int threadID,
                                       bool withinSampleThread ) const;

};

} // end namespace itk

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

#endif

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