itkRecursiveGaussianImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkRecursiveGaussianImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-17 16:30:50 $
  Version:   $Revision: 1.27 $

  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 __itkRecursiveGaussianImageFilter_h
#define __itkRecursiveGaussianImageFilter_h

#include "itkRecursiveSeparableImageFilter.h"

namespace itk
{
  
template <typename TInputImage, typename TOutputImage=TInputImage>
class ITK_EXPORT RecursiveGaussianImageFilter :
    public RecursiveSeparableImageFilter<TInputImage,TOutputImage> 
{
public:
  typedef RecursiveGaussianImageFilter                            Self;
  typedef RecursiveSeparableImageFilter<TInputImage,TOutputImage> Superclass;
  typedef SmartPointer<Self>                                      Pointer;
  typedef SmartPointer<const Self>                                ConstPointer;

  typedef typename Superclass::RealType                           RealType;
  typedef typename Superclass::ScalarRealType                     ScalarRealType;

  itkNewMacro(Self);

  itkTypeMacro( RecursiveGaussianImageFilter, RecursiveSeparableImageFilter );

  itkGetMacro( Sigma, ScalarRealType );
  itkSetMacro( Sigma, ScalarRealType );

  typedef  enum { ZeroOrder, FirstOrder, SecondOrder } OrderEnumType;

  typedef TOutputImage      OutputImageType;


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

  itkSetMacro( Order, OrderEnumType );
  itkGetMacro( Order, OrderEnumType );

  void SetZeroOrder();

  void SetFirstOrder();

  void SetSecondOrder();

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

  virtual void SetUp(ScalarRealType spacing);

private:  
  RecursiveGaussianImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  void ComputeNCoefficients(ScalarRealType sigmad,
          ScalarRealType A1, ScalarRealType B1, ScalarRealType W1, ScalarRealType L1,
          ScalarRealType A2, ScalarRealType B2, ScalarRealType W2, ScalarRealType L2,
          ScalarRealType& N0, ScalarRealType& N1,
          ScalarRealType& N2, ScalarRealType& N3,
          ScalarRealType& SN, ScalarRealType& DN, ScalarRealType& EN);

  void ComputeDCoefficients(ScalarRealType sigmad,
          ScalarRealType W1, ScalarRealType L1, ScalarRealType W2, ScalarRealType L2,
          ScalarRealType& SD, ScalarRealType& DD, ScalarRealType& ED);

  void ComputeRemainingCoefficients(bool symmetric);

  ScalarRealType m_Sigma;

  bool m_NormalizeAcrossScale; 

  OrderEnumType m_Order;
};

} // end namespace itk

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

#endif

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