itkImageToImageMetric.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageToImageMetric.h,v $
  Language:  C++
  Date:      $Date: 2002/09/11 19:39:01 $
  Version:   $Revision: 1.14 $

  Copyright (c) 2002 Insight 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

#include "itkImageBase.h"
#include "itkTransform.h"
#include "itkInterpolateImageFunction.h"
#include "itkSingleValuedCostFunction.h"
#include "itkExceptionObject.h"
#include "itkGradientRecursiveGaussianImageFilter.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 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 Superclass::MeasureType                    MeasureType;

  typedef Superclass::DerivativeType                 DerivativeType;

  typedef Superclass::ParametersType                 ParametersType;

  itkSetConstObjectMacro( FixedImage, FixedImageType );

  itkGetConstObjectMacro( FixedImage, FixedImageType );

  itkSetConstObjectMacro( MovingImage, MovingImageType );

  itkGetConstObjectMacro( MovingImage, MovingImageType );

  itkSetObjectMacro( Transform, TransformType );

  itkGetObjectMacro( Transform, TransformType );
 
  itkSetObjectMacro( Interpolator, InterpolatorType );

  itkGetObjectMacro( Interpolator, InterpolatorType );

  itkGetConstMacro( NumberOfPixelsCounted, unsigned long );

  itkSetMacro( FixedImageRegion, FixedImageRegionType );

  itkGetConstMacro( FixedImageRegion, FixedImageRegionType );

  void SetTransformParameters( const ParametersType & parameters ) const;

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

  virtual void Initialize(void) throw ( ExceptionObject );

  itkSetMacro( ScaleGradient, RealType );
  itkGetMacro( ScaleGradient, RealType );

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;

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


  // This is the Sigma value to be used by the Gradient Filter
  RealType                    m_ScaleGradient;
};

} // end namespace itk

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

#endif

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