itkGaussianBlurImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGaussianBlurImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2009-05-14 02:11:46 $
  Version:   $Revision: 1.17 $

  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 __itkGaussianBlurImageFunction_h
#define __itkGaussianBlurImageFunction_h

#include "itkNeighborhoodOperatorImageFunction.h"
#include "itkGaussianOperator.h"
#include "itkGaussianSpatialFunction.h"
#include "itkImageFunction.h"
#include "itkCastImageFilter.h"

namespace itk
{

template <class TInputImage,class TOutput=double>
class ITK_EXPORT GaussianBlurImageFunction :
  public ImageFunction< TInputImage, TOutput >
{
public:

  typedef GaussianBlurImageFunction Self;

  typedef ImageFunction<TInputImage, TOutput> Superclass;

  typedef SmartPointer<Self>          Pointer;
  typedef SmartPointer<const Self>    ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro( GaussianBlurImageFunction, ImageFunction );

  typedef TInputImage                                 InputImageType;
  typedef typename InputImageType::PixelType          InputPixelType;
  typedef typename Superclass::IndexType              IndexType;
  typedef typename Superclass::ContinuousIndexType    ContinuousIndexType;


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

  typedef GaussianOperator<
    TOutput, itkGetStaticConstMacro(ImageDimension)>                            GaussianOperatorType;
  typedef Neighborhood<TOutput, itkGetStaticConstMacro(ImageDimension)>         NeighborhoodType;
  typedef FixedArray<NeighborhoodType,itkGetStaticConstMacro(ImageDimension)>   OperatorArrayType;

  typedef GaussianSpatialFunction<TOutput,1>                                    GaussianFunctionType;
  typedef typename GaussianFunctionType::Pointer                                GaussianFunctionPointer;
  typedef itk::Image<double,itkGetStaticConstMacro(ImageDimension)>             InternalImageType;
  typedef typename InternalImageType::Pointer                                   InternalImagePointer;

  typedef NeighborhoodOperatorImageFunction< InternalImageType, TOutput>        OperatorImageFunctionType;
  typedef typename OperatorImageFunctionType::Pointer                           OperatorImageFunctionPointer;

  typedef itk::CastImageFilter<InputImageType,InternalImageType>                CastImageFilterType;
  typedef typename CastImageFilterType::Pointer                                 CastImageFilterPointer;

  typedef itk::FixedArray< double, itkGetStaticConstMacro(ImageDimension) >     ErrorArrayType;
  typedef itk::FixedArray< double, itkGetStaticConstMacro(ImageDimension) >     ExtentArrayType;
  typedef itk::FixedArray< double, itkGetStaticConstMacro(ImageDimension) >     SigmaArrayType;

  typedef typename Superclass::PointType PointType;

   virtual TOutput Evaluate(const PointType& point) const;


  virtual TOutput EvaluateAtIndex( const IndexType & index ) const;

  virtual TOutput EvaluateAtContinuousIndex(
    const ContinuousIndexType & index ) const;

  void SetSigma( const double* sigma);
  void SetSigma( const float* sigma);
  void SetSigma( const double sigma);
  itkSetMacro( Sigma, SigmaArrayType );
  itkGetConstReferenceMacro( Sigma, SigmaArrayType );

  virtual void SetInputImage( const InputImageType * ptr );

  itkSetMacro( Extent, ExtentArrayType );
  itkGetConstReferenceMacro( Extent, ExtentArrayType );
  void SetExtent( const double* extent);
  void SetExtent( const double extent);

  itkSetMacro( MaximumError, ErrorArrayType );
  itkGetConstReferenceMacro( MaximumError, ErrorArrayType );

  itkSetMacro( MaximumKernelWidth, int );
  itkGetConstMacro( MaximumKernelWidth, int );

  itkSetMacro( UseImageSpacing, bool );
  itkGetConstMacro( UseImageSpacing, bool );
  itkBooleanMacro( UseImageSpacing );


protected:
  GaussianBlurImageFunction();
  GaussianBlurImageFunction( const Self& ){};

  ~GaussianBlurImageFunction(){};

  void operator=( const Self& ){};
  void PrintSelf(std::ostream& os, Indent indent) const;

  void RecomputeGaussianKernel();
  void RecomputeContinuousGaussianKernel(const double* offset) const;

private:

  virtual TOutput EvaluateAtIndex( 
    const IndexType & index, const OperatorArrayType & operatorArray ) const;

  SigmaArrayType                m_Sigma;
  OperatorImageFunctionPointer  m_OperatorImageFunction;
  mutable OperatorArrayType     m_OperatorArray;
  mutable OperatorArrayType     m_ContinuousOperatorArray;
  InternalImagePointer          m_InternalImage;
  CastImageFilterPointer        m_Caster;

  ErrorArrayType                m_MaximumError;
  ExtentArrayType               m_Extent;

  int m_MaximumKernelWidth;

  unsigned int m_FilterDimensionality;

  bool m_UseImageSpacing;

  GaussianFunctionPointer m_GaussianFunction;
};

} // end namespace itk

// Define instantiation macro for this template.
#define ITK_TEMPLATE_GaussianBlurImageFunction(_, EXPORT, x, y) namespace itk { \
  _(2(class EXPORT GaussianBlurImageFunction< ITK_TEMPLATE_2 x >)) \
  namespace Templates { typedef GaussianBlurImageFunction< ITK_TEMPLATE_2 x > \
                                                  GaussianBlurImageFunction##y; } \
  }

#if ITK_TEMPLATE_EXPLICIT
# include "Templates/itkGaussianBlurImageFunction+-.h"
#endif

#if ITK_TEMPLATE_TXX
# include "itkGaussianBlurImageFunction.txx"
#endif

#endif