itkGaussianBlurImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGaussianBlurImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2004/01/16 16:00:16 $
  Version:   $Revision: 1.8 $

  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[ImageDimension] );
  void SetSigma( const float sigma[ImageDimension] );
  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[ImageDimension] );
  void SetExtent( const double extent);

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

  itkSetMacro( MaximumKernelWidth, int );
  itkGetMacro( MaximumKernelWidth, int );

  itkSetMacro( UseImageSpacing, bool );
  itkGetMacro( 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[ImageDimension] ) const;

private:
  
  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;
};

} // namespace itk

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

#endif

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