itkDeformationFieldJacobianDeterminantFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkDeformationFieldJacobianDeterminantFilter.h,v $
  Language:  C++
  Date:      $Date: 2005-08-24 18:00:04 $
  Version:   $Revision: 1.3 $

  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 __itkDeformationFieldJacobianDeterminantFilter_h
#define __itkDeformationFieldJacobianDeterminantFilter_h

#include "itkConstNeighborhoodIterator.h"
#include "itkNeighborhoodIterator.h"
#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkVector.h"
#include "vnl/vnl_matrix.h"
#include "vnl/vnl_det.h"

namespace itk
{
template < typename TInputImage,
           typename TRealType = float,
           typename TOutputImage = Image< TRealType,
                                          ::itk::GetImageDimension<TInputImage>::ImageDimension >
>
class ITK_EXPORT DeformationFieldJacobianDeterminantFilter :
    public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
  typedef DeformationFieldJacobianDeterminantFilter Self;
  typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(DeformationFieldJacobianDeterminantFilter, ImageToImageFilter);

  typedef typename TOutputImage::PixelType OutputPixelType;
  typedef typename TInputImage::PixelType  InputPixelType;

  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;
  typedef typename InputImageType::Pointer  InputImagePointer;
  typedef typename OutputImageType::Pointer OutputImagePointer;

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

  itkStaticConstMacro(VectorDimension, unsigned int,
                      InputPixelType::Dimension);

  typedef TRealType RealType;
  typedef Vector<TRealType, ::itk::GetVectorDimension<InputPixelType>::VectorDimension> RealVectorType;
  typedef Image<RealVectorType, ::itk::GetImageDimension<TInputImage>::ImageDimension>  RealVectorImageType;


  typedef ConstNeighborhoodIterator<RealVectorImageType> ConstNeighborhoodIteratorType;
  typedef typename ConstNeighborhoodIteratorType::RadiusType RadiusType;  

  typedef typename Superclass::OutputImageRegionType OutputImageRegionType;

  virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);

  void SetUseImageSpacingOn()
  { this->SetUseImageSpacing(true); }

  void SetUseImageSpacingOff()
  { this->SetUseImageSpacing(false); }

  void SetUseImageSpacing(bool);                         
  itkGetMacro(UseImageSpacing, bool);

  void SetDerivativeWeights(TRealType data[]);
  itkGetVectorMacro(DerivativeWeights, const TRealType, itk::GetImageDimension<TInputImage>::ImageDimension);

protected:
  DeformationFieldJacobianDeterminantFilter();
  virtual ~DeformationFieldJacobianDeterminantFilter() {}

  void BeforeThreadedGenerateData ();

  void ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
                            int threadId );

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

  typedef typename InputImageType::Superclass ImageBaseType;

  itkGetConstObjectMacro( RealValuedInputImage, ImageBaseType );

  itkGetConstReferenceMacro( NeighborhoodRadius, RadiusType );
  itkSetMacro( NeighborhoodRadius, RadiusType );


  TRealType EvaluateAtNeighborhood
  (const ConstNeighborhoodIteratorType &it) const
  {
    unsigned i, j;
    vnl_matrix_fixed<TRealType,ImageDimension,VectorDimension> J;

    for (i = 0; i < ImageDimension; ++i)
      {
      for (j = 0; j < VectorDimension; ++j)
        {
        J[i][j] = m_DerivativeWeights[i]
                  * 0.5 * (it.GetNext(i)[j] - it.GetPrevious(i)[j]);
        }
      }
    
    return vnl_det(J);
  }

  TRealType m_DerivativeWeights[itk::GetImageDimension<TInputImage>::ImageDimension];

private:
  bool m_UseImageSpacing;
  int m_RequestedNumberOfThreads;

  typename ImageBaseType::ConstPointer m_RealValuedInputImage;
  
  DeformationFieldJacobianDeterminantFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  RadiusType    m_NeighborhoodRadius;  
};
  
} // end namespace itk

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

#endif

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