itkImageToImageMetric.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageToImageMetric.h,v $
  Language:  C++
  Date:      $Date: 2007-11-12 20:00:37 $
  Version:   $Revision: 1.25 $

  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 __itkImageToImageMetric_h
#define __itkImageToImageMetric_h

// First make sure that the configuration is available.
// This line can be removed once the optimized versions
// gets integrated into the main directories.
#include "itkConfigure.h"

#ifdef ITK_USE_OPTIMIZED_REGISTRATION_METHODS
#include "itkOptImageToImageMetric.h"
#else

#include "itkImageBase.h"
#include "itkTransform.h"
#include "itkInterpolateImageFunction.h"
#include "itkSingleValuedCostFunction.h"
#include "itkExceptionObject.h"
#include "itkGradientRecursiveGaussianImageFilter.h"
#include "itkSpatialObject.h"

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

  typedef typename Superclass::ParametersValueType CoordinateRepresentationType;

  itkTypeMacro(ImageToImageMetric, SingleValuedCostFunction);

  typedef TMovingImage                               MovingImageType;
  typedef typename TMovingImage::PixelType           MovingImagePixelType;
  typedef typename MovingImageType::ConstPointer     MovingImageConstPointer;

  typedef TFixedImage                                FixedImageType;
  typedef typename FixedImageType::ConstPointer      FixedImageConstPointer;
  typedef typename FixedImageType::RegionType        FixedImageRegionType;

  itkStaticConstMacro(MovingImageDimension, 
                      unsigned int,
                      TMovingImage::ImageDimension);
  itkStaticConstMacro(FixedImageDimension, 
                      unsigned int,
                      TFixedImage::ImageDimension);

  typedef Transform<CoordinateRepresentationType, 
                    itkGetStaticConstMacro(MovingImageDimension),
                    itkGetStaticConstMacro(FixedImageDimension)> 
                                                     TransformType;

  typedef typename TransformType::Pointer            TransformPointer;
  typedef typename TransformType::InputPointType     InputPointType;
  typedef typename TransformType::OutputPointType    OutputPointType;
  typedef typename TransformType::ParametersType     TransformParametersType;
  typedef typename TransformType::JacobianType       TransformJacobianType;

  typedef InterpolateImageFunction<
    MovingImageType,
    CoordinateRepresentationType > InterpolatorType;


  typedef typename NumericTraits<MovingImagePixelType>::RealType 
                                                     RealType;
  typedef CovariantVector<RealType,
                          itkGetStaticConstMacro(MovingImageDimension)>
                                                     GradientPixelType;
  typedef Image<GradientPixelType,
                itkGetStaticConstMacro(MovingImageDimension)> 
                                                     GradientImageType;
  typedef SmartPointer<GradientImageType>            GradientImagePointer;
  typedef GradientRecursiveGaussianImageFilter< MovingImageType,
                                                GradientImageType >
                                                     GradientImageFilterType;  
  typedef typename GradientImageFilterType::Pointer  GradientImageFilterPointer;


  typedef typename InterpolatorType::Pointer         InterpolatorPointer;


  typedef SpatialObject< itkGetStaticConstMacro(FixedImageDimension) >
                                                     FixedImageMaskType;
  typedef typename  FixedImageMaskType::Pointer      FixedImageMaskPointer;

  typedef SpatialObject< itkGetStaticConstMacro(MovingImageDimension) >
                                                     MovingImageMaskType;
  typedef typename  MovingImageMaskType::Pointer     MovingImageMaskPointer;


  typedef typename Superclass::MeasureType                    MeasureType;

  typedef typename Superclass::DerivativeType                 DerivativeType;

  typedef typename Superclass::ParametersType                 ParametersType;

  itkSetConstObjectMacro( FixedImage, FixedImageType );

  itkGetConstObjectMacro( FixedImage, FixedImageType );

  itkSetConstObjectMacro( MovingImage, MovingImageType );

  itkGetConstObjectMacro( MovingImage, MovingImageType );

  itkSetObjectMacro( Transform, TransformType );

  itkGetConstObjectMacro( Transform, TransformType );

  itkSetObjectMacro( Interpolator, InterpolatorType );

  itkGetConstObjectMacro( Interpolator, InterpolatorType );

  itkGetConstReferenceMacro( NumberOfPixelsCounted, unsigned long );

  itkSetMacro( FixedImageRegion, FixedImageRegionType );

  itkGetConstReferenceMacro( FixedImageRegion, FixedImageRegionType );

  itkSetObjectMacro( MovingImageMask, MovingImageMaskType );
  itkGetConstObjectMacro( MovingImageMask, MovingImageMaskType );

  itkSetObjectMacro( FixedImageMask, FixedImageMaskType );
  itkGetConstObjectMacro( FixedImageMask, FixedImageMaskType );

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

  virtual void ComputeGradient();

  itkGetConstObjectMacro( GradientImage, GradientImageType );

  void SetTransformParameters( const ParametersType & parameters ) const;

  unsigned int GetNumberOfParameters(void) const 
    { return m_Transform->GetNumberOfParameters(); }

  virtual void Initialize(void) throw ( ExceptionObject );

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

  mutable unsigned long       m_NumberOfPixelsCounted;

  FixedImageConstPointer      m_FixedImage;
  MovingImageConstPointer     m_MovingImage;

  mutable TransformPointer    m_Transform;
  InterpolatorPointer         m_Interpolator;

  bool                        m_ComputeGradient;
  GradientImagePointer        m_GradientImage;

  mutable FixedImageMaskPointer   m_FixedImageMask;
  mutable MovingImageMaskPointer  m_MovingImageMask;

private:
  ImageToImageMetric(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
  
  FixedImageRegionType        m_FixedImageRegion;  

};

} // end namespace itk

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

#endif

#endif