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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkExtrapolateImageFunction.h,v $
Language: C++
Date: $Date: 2006-02-06 22:01:55 $
Version: $Revision: 1.4 $
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 __itkExtrapolateImageFunction_h
#define __itkExtrapolateImageFunction_h
#include "itkImageFunction.h"
namespace itk
{
/** \class ExtrapolateImageFunction
* \brief Base class for all image extrapolaters.
*
* ExtrapolateImageFunction is the base for all ImageFunctions that
* extrapolates image intensity at a non-integer pixel position
* outside the image buffer.
* This class is templated over the input image type and the
* coordinate representation type (e.g. float or double ).
*
* \warning This heirarchy of functions work only for images
* with scalar pixel types.
*
* \ingroup ImageFunctions
*
* */
template <class TInputImage, class TCoordRep = float>
class ITK_EXPORT ExtrapolateImageFunction :
public ImageFunction< TInputImage,
ITK_TYPENAME NumericTraits<typename TInputImage::PixelType>::RealType, TCoordRep >
{
public:
/** Standard class typedefs. */
typedef ExtrapolateImageFunction Self;
typedef ImageFunction<TInputImage,double,TCoordRep> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods). */
itkTypeMacro(ExtrapolateImageFunction, ImageFunction);
/** OutputType typedef support. */
typedef typename Superclass::OutputType OutputType;
/** InputImageType typedef support. */
typedef typename Superclass::InputImageType InputImageType;
/** Dimension underlying input image. */
itkStaticConstMacro(ImageDimension, unsigned int,
Superclass::ImageDimension);
/** Point typedef support. */
typedef typename Superclass::PointType PointType;
/** Index typedef support. */
typedef typename Superclass::IndexType IndexType;
/** ContinuousIndex typedef support. */
typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
/** RealType typedef support. */
typedef typename NumericTraits<typename TInputImage::PixelType>::RealType RealType;
/** Extrapolate the image at a point position
*
* Returns the extrapolated image intensity at a
* specified point position.
*/
virtual OutputType Evaluate( const PointType& point ) const
{
ContinuousIndexType index;
this->GetInputImage()->TransformPhysicalPointToContinuousIndex( point, index );
return ( this->EvaluateAtContinuousIndex( index ) );
}
/** Extrapolate the image at a continuous index position
*
* Returns the extrapolated image intensity at a
* specified point position.
*/
virtual OutputType EvaluateAtContinuousIndex(
const ContinuousIndexType & index ) const = 0;
/** Extrapolate the image at an index position.
*
* Returns the extrapolated image intensity at a
* specified point position.
*/
virtual OutputType EvaluateAtIndex(
const IndexType & index ) const = 0;
protected:
ExtrapolateImageFunction(){};
~ExtrapolateImageFunction(){};
void PrintSelf(std::ostream& os, Indent indent) const
{ Superclass::PrintSelf( os, indent ); }
private:
ExtrapolateImageFunction( const Self& ); //purposely not implemented
void operator=( const Self& ); //purposely not implemented
};
} // end namespace itk
#endif
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