itkBSplineInterpolateImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkBSplineInterpolateImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2008-01-04 12:56:30 $
  Version:   $Revision: 1.18 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

  Portions of this code are covered under the VTK copyright.
  See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.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 __itkBSplineInterpolateImageFunction_h
#define __itkBSplineInterpolateImageFunction_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 "itkOptBSplineInterpolateImageFunction.h"
#else

#include <vector>

#include "itkImageLinearIteratorWithIndex.h"
#include "itkInterpolateImageFunction.h"
#include "vnl/vnl_matrix.h"

#include "itkBSplineDecompositionImageFilter.h"
#include "itkConceptChecking.h"
#include "itkCovariantVector.h"

namespace itk
{
template <
  class TImageType, 
  class TCoordRep = double,
  class TCoefficientType = double >
class ITK_EXPORT BSplineInterpolateImageFunction : 
    public InterpolateImageFunction<TImageType,TCoordRep> 
{
public:
  typedef BSplineInterpolateImageFunction       Self;
  typedef InterpolateImageFunction<TImageType,TCoordRep>  Superclass;
  typedef SmartPointer<Self>                    Pointer;
  typedef SmartPointer<const Self>              ConstPointer;

  itkTypeMacro(BSplineInterpolateImageFunction, InterpolateImageFunction);


  itkNewMacro( Self );

  typedef typename Superclass::OutputType OutputType;

  typedef typename Superclass::InputImageType InputImageType;

  itkStaticConstMacro(ImageDimension, unsigned int,Superclass::ImageDimension);

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  typedef typename Superclass::PointType PointType;

  typedef ImageLinearIteratorWithIndex<TImageType> Iterator;

  typedef TCoefficientType CoefficientDataType;
  typedef Image<CoefficientDataType, 
                     itkGetStaticConstMacro(ImageDimension)
    > CoefficientImageType;

  typedef BSplineDecompositionImageFilter<TImageType, CoefficientImageType> 
  CoefficientFilter;
  typedef typename CoefficientFilter::Pointer CoefficientFilterPointer;

  virtual OutputType EvaluateAtContinuousIndex( 
    const ContinuousIndexType & index ) const; 

  typedef CovariantVector<OutputType,
                          itkGetStaticConstMacro(ImageDimension)
    > CovariantVectorType;

  CovariantVectorType EvaluateDerivative( const PointType & point ) const
  {    
    ContinuousIndexType index;
    this->GetInputImage()->TransformPhysicalPointToContinuousIndex( point, index );
    return ( this->EvaluateDerivativeAtContinuousIndex( index ) );
  } 

  CovariantVectorType EvaluateDerivativeAtContinuousIndex( 
    const ContinuousIndexType & x ) const;


  void SetSplineOrder(unsigned int SplineOrder);
  itkGetMacro(SplineOrder, int);


  virtual void SetInputImage(const TImageType * inputData);


  itkSetMacro( UseImageDirection, bool );
  itkGetMacro( UseImageDirection, bool );
  itkBooleanMacro( UseImageDirection );


protected:
  BSplineInterpolateImageFunction();
  virtual ~BSplineInterpolateImageFunction() {};
  void operator=( const Self& ); //purposely not implemented
  void PrintSelf(std::ostream& os, Indent indent) const;

  // These are needed by the smoothing spline routine.
  std::vector<CoefficientDataType>    m_Scratch;        // temp storage for processing of Coefficients
  typename TImageType::SizeType       m_DataLength;  // Image size
  unsigned int                        m_SplineOrder; // User specified spline order (3rd or cubic is the default)

  typename CoefficientImageType::ConstPointer       m_Coefficients; // Spline coefficients  

private:
  BSplineInterpolateImageFunction( const Self& ); //purposely not implemented
  void SetInterpolationWeights( const ContinuousIndexType & x, 
                                const vnl_matrix<long> & EvaluateIndex, 
                                vnl_matrix<double> & weights, 
                                unsigned int splineOrder ) const;

  void SetDerivativeWeights( const ContinuousIndexType & x, 
                             const vnl_matrix<long> & EvaluateIndex, 
                             vnl_matrix<double> & weights, 
                             unsigned int splineOrder ) const;

  void GeneratePointsToIndex(  );

  void DetermineRegionOfSupport( vnl_matrix<long> & evaluateIndex, 
                                 const ContinuousIndexType & x, 
                                 unsigned int splineOrder ) const;

  void ApplyMirrorBoundaryConditions(vnl_matrix<long> & evaluateIndex, 
                                     unsigned int splineOrder) const;


  Iterator                  m_CIterator;    // Iterator for traversing spline coefficients.
  unsigned long             m_MaxNumberInterpolationPoints; // number of neighborhood points used for interpolation
  std::vector<IndexType>    m_PointsToIndex;  // Preallocation of interpolation neighborhood indicies

  CoefficientFilterPointer     m_CoefficientFilter;
  
  // flag to take or not the image direction into account when computing the
  // derivatives.
  bool m_UseImageDirection;

};

} // namespace itk

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

#endif

#endif

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