itkSmoothingRecursiveGaussianImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSmoothingRecursiveGaussianImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2005/08/08 19:22:19 $
  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 __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;


  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 );

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

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; 

};

} // end namespace itk

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

#endif

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