itkVarianceImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkVarianceImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2009-03-03 15:11:25 $
  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 __itkVarianceImageFunction_h
#define __itkVarianceImageFunction_h

#include "itkImageFunction.h"
#include "itkNumericTraits.h"

namespace itk
{

template <class TInputImage, class TCoordRep = float >
class ITK_EXPORT VarianceImageFunction :
  public ImageFunction< TInputImage, ITK_TYPENAME NumericTraits<typename TInputImage::PixelType>::RealType,
    TCoordRep >
{
public:

  typedef VarianceImageFunction     Self;
  typedef ImageFunction<TInputImage, ITK_TYPENAME NumericTraits<typename TInputImage::PixelType>::RealType,
    TCoordRep >                     Superclass;
  typedef SmartPointer<Self>        Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkTypeMacro(VarianceImageFunction, ImageFunction);

  itkNewMacro(Self);

  typedef TInputImage InputImageType;

  typedef typename Superclass::OutputType OutputType;

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  typedef typename Superclass::PointType PointType;

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

  typedef typename NumericTraits<typename InputImageType::PixelType>::RealType
      RealType;

  virtual RealType EvaluateAtIndex( const IndexType& index ) const;

  virtual RealType Evaluate( const PointType& point ) const
    { 
    IndexType index;
    this->ConvertPointToNearestIndex( point, index );
    return this->EvaluateAtIndex( index ); 
    }
  virtual RealType EvaluateAtContinuousIndex( 
    const ContinuousIndexType& cindex ) const
    { 
    IndexType index;
    this->ConvertContinuousIndexToNearestIndex( cindex, index );
    return this->EvaluateAtIndex( index ); 
    }

  itkSetMacro( NeighborhoodRadius, unsigned int );
  itkGetConstReferenceMacro( NeighborhoodRadius, unsigned int );

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

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

  unsigned int m_NeighborhoodRadius;

};

} // end namespace itk

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

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

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

#endif