itkHessianRecursiveGaussianImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkHessianRecursiveGaussianImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-16 16:45:10 $
  Version:   $Revision: 1.9 $

  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 __itkHessianRecursiveGaussianImageFilter_h
#define __itkHessianRecursiveGaussianImageFilter_h

#include "itkRecursiveGaussianImageFilter.h"
#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkSymmetricSecondRankTensor.h"
#include "itkPixelTraits.h"
#include "itkCommand.h"


namespace itk
{

// NOTE that the ITK_TYPENAME macro has to be used here in lieu 
// of "typename" because VC++ doesn't like the typename keyword 
// on the defaults of template parameters
template <typename TInputImage, 
          typename TOutputImage= Image< SymmetricSecondRankTensor< 
  ITK_TYPENAME NumericTraits< ITK_TYPENAME TInputImage::PixelType>::RealType,
  ::itk::GetImageDimension<TInputImage>::ImageDimension >,
                                        ::itk::GetImageDimension<TInputImage>::ImageDimension > >
class ITK_EXPORT HessianRecursiveGaussianImageFilter:
    public ImageToImageFilter<TInputImage,TOutputImage>
{
public:
  typedef HessianRecursiveGaussianImageFilter          Self;
  typedef ImageToImageFilter<TInputImage,TOutputImage> Superclass;
  typedef SmartPointer<Self>                           Pointer;
  typedef SmartPointer<const Self>                     ConstPointer;

  
  typedef TInputImage                                    InputImageType;
  typedef typename TInputImage::PixelType                PixelType;
  typedef typename NumericTraits<PixelType>::RealType    RealType;


  itkStaticConstMacro(ImageDimension, unsigned int,
                      ::itk::GetImageDimension<TInputImage>::ImageDimension);

  itkStaticConstMacro(NumberOfSmoothingFilters, unsigned int,
                      ::itk::GetImageDimension<TInputImage>::ImageDimension-2);

  typedef float                                            InternalRealType;
  typedef Image<
    InternalRealType, 
    ::itk::GetImageDimension<TInputImage>::ImageDimension > RealImageType;

  typedef NthElementImageAdaptor< TOutputImage,
                                  InternalRealType >  OutputImageAdaptorType;
  typedef typename OutputImageAdaptorType::Pointer    OutputImageAdaptorPointer;

  typedef RecursiveGaussianImageFilter<
                                RealImageType,
                                RealImageType
                                        >    GaussianFilterType;

  typedef RecursiveGaussianImageFilter<
                                InputImageType,
                                RealImageType
                                        >    DerivativeFilterAType;

  typedef RecursiveGaussianImageFilter<
                                RealImageType,
                                RealImageType
                                        >    DerivativeFilterBType;

  typedef typename GaussianFilterType::Pointer    GaussianFilterPointer;
  typedef std::vector< GaussianFilterPointer >    GaussianFiltersArray;

  typedef typename DerivativeFilterAType::Pointer  DerivativeFilterAPointer;
  typedef typename DerivativeFilterBType::Pointer  DerivativeFilterBPointer;

  typedef typename TOutputImage::Pointer          OutputImagePointer;

  typedef TOutputImage                                      OutputImageType;
  typedef typename          OutputImageType::PixelType      OutputPixelType;
  typedef typename PixelTraits<OutputPixelType>::ValueType  OutputComponentType;

  itkTypeMacro( HessianRecursiveGaussianImageFilter, ImageToImageFilter );

  itkNewMacro(Self);

  void SetSigma( RealType sigma );

  void SetNormalizeAcrossScale( bool normalizeInScaleSpace );
  itkGetMacro( NormalizeAcrossScale, bool );

  virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(InputHasNumericTraitsCheck,
                  (Concept::HasNumericTraits<PixelType>));
  itkConceptMacro(OutputHasPixelTraitsCheck,
                  (Concept::HasPixelTraits<OutputPixelType>));

#endif

protected:
  
  HessianRecursiveGaussianImageFilter();
  virtual ~HessianRecursiveGaussianImageFilter() {};
  void PrintSelf(std::ostream& os, Indent indent) const;
  
  void GenerateData( void );

  // Override since the filter produces the entire dataset
  void EnlargeOutputRequestedRegion(DataObject *output);

  
private:

  HessianRecursiveGaussianImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
  
  GaussianFiltersArray          m_SmoothingFilters;
  DerivativeFilterAPointer      m_DerivativeFilterA;
  DerivativeFilterBPointer      m_DerivativeFilterB;
  OutputImageAdaptorPointer     m_ImageAdaptor;

  bool m_NormalizeAcrossScale; 

};

} // end namespace itk

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

#endif