itkSmoothingRecursiveGaussianImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSmoothingRecursiveGaussianImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-07-31 09:14:58 $
  Version:   $Revision: 1.15 $

  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 __itkSmoothingRecursiveGaussianImageFilter_h
#define __itkSmoothingRecursiveGaussianImageFilter_h

#include "itkRecursiveGaussianImageFilter.h"
#include "itkCastImageFilter.h"
#include "itkImage.h"
#include "itkPixelTraits.h"
#include "itkCommand.h"


namespace itk
{

template <typename TInputImage, 
          typename TOutputImage= TInputImage >
class ITK_EXPORT SmoothingRecursiveGaussianImageFilter:
    public ImageToImageFilter<TInputImage,TOutputImage>
{
public:
  typedef SmoothingRecursiveGaussianImageFilter             Self;
  typedef ImageToImageFilter<TInputImage,TOutputImage>      Superclass;
  typedef SmartPointer<Self>                                Pointer;
  typedef SmartPointer<const Self>                          ConstPointer;

  
  typedef TInputImage                                       InputImageType;
  typedef TOutputImage                                      OutputImageType;
  typedef typename TInputImage::PixelType                   PixelType;
  typedef typename NumericTraits<PixelType>::RealType       RealType;
  typedef typename NumericTraits<PixelType>::ScalarRealType ScalarRealType;


  itkTypeMacro(SmoothingRecursiveGaussianImageFilter, 
               ImageToImageFilter);

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

  typedef typename NumericTraits< PixelType >::FloatType   InternalRealType;
  typedef Image<InternalRealType, 
                itkGetStaticConstMacro(ImageDimension) >   RealImageType;

  typedef RecursiveGaussianImageFilter<
    InputImageType,
    RealImageType
    >    FirstGaussianFilterType;

  typedef RecursiveGaussianImageFilter<
    RealImageType,
    RealImageType
    >    InternalGaussianFilterType;

  typedef CastImageFilter<
    RealImageType,
    OutputImageType
    >    CastingFilterType;


  typedef typename InternalGaussianFilterType::Pointer    InternalGaussianFilterPointer;

  typedef typename FirstGaussianFilterType::Pointer       FirstGaussianFilterPointer;

  typedef typename CastingFilterType::Pointer             CastingFilterPointer;

  typedef typename OutputImageType::Pointer                  OutputImagePointer;

  itkNewMacro(Self);

  void SetSigma( ScalarRealType sigma );
  itkGetMacro(Sigma, ScalarRealType);

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

  void SetNumberOfThreads( int nb );

#ifdef ITK_USE_CONCEPT_CHECKING

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

#endif

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

  virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);

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

private:
  SmoothingRecursiveGaussianImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
  
  InternalGaussianFilterPointer         m_SmoothingFilters[ImageDimension-1];
  FirstGaussianFilterPointer            m_FirstSmoothingFilter;
  CastingFilterPointer                  m_CastingFilter;

  bool m_NormalizeAcrossScale; 

  ScalarRealType                        m_Sigma;
};

} // end namespace itk

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

#endif