itkGradientRecursiveGaussianImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGradientRecursiveGaussianImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2002/09/11 19:39:01 $
  Version:   $Revision: 1.25 $

  Copyright (c) 2002 Insight 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 __itkGradientRecursiveGaussianImageFilter_h
#define __itkGradientRecursiveGaussianImageFilter_h

#include "itkRecursiveGaussianImageFilter.h"
#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkPixelTraits.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< CovariantVector< 
                      ITK_TYPENAME NumericTraits< ITK_TYPENAME TInputImage::PixelType>::RealType,
                      ::itk::GetImageDimension<TInputImage>::ImageDimension >,
                          ::itk::GetImageDimension<TInputImage>::ImageDimension > >
class ITK_EXPORT GradientRecursiveGaussianImageFilter:
  public ImageToImageFilter<TInputImage,TOutputImage>
{
public:
  typedef GradientRecursiveGaussianImageFilter  Self;
  typedef ImageToImageFilter<TInputImage,TOutputImage> Superclass;
  typedef SmartPointer<Self>                   Pointer;
  typedef SmartPointer<const Self>        ConstPointer;
  
  
  typedef typename TInputImage::PixelType                PixelType;
  typedef typename NumericTraits<PixelType>::RealType    RealType;

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

  typedef RecursiveGaussianImageFilter<
                                  TInputImage,
                                  TInputImage
                                  >    GaussianFilterType;

  typedef typename GaussianFilterType::Pointer   GaussianFilterPointer;
  typedef typename TOutputImage::Pointer          OutputImagePointer;                                  
  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension);

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

  itkNewMacro(Self);

  void SetSigma( RealType sigma );

  itkSetMacro( NormalizeAcrossScale, bool );
  itkGetMacro( NormalizeAcrossScale, bool );

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

private:
  GradientRecursiveGaussianImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
  
  GaussianFilterPointer         m_SmoothingFilters[ImageDimension-1];
  GaussianFilterPointer         m_DerivativeFilter;
  OutputImageAdaptorPointer     m_ImageAdaptor;

  bool m_NormalizeAcrossScale; 

};

} // end namespace itk

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

#endif

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