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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction.h
Language: C++
Date: $Date$
Version: $Revision$
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 __itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction_h
#define __itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction_h
#include "itkVectorInterpolateImageFunction.h"
namespace itk
{
/**
* \class VectorLinearInterpolateNearestNeighborExtrapolateImageFunction
* \brief Linearly interpolate or NN extrapolate a vector image at
* specified positions.
*
* VectorLinearInterpolateNearestNeighborExtrapolateImageFunction
* linearly interpolates (or NN extrapolates) a vector
* image intensity non-integer pixel position. This class is templated
* over the input image type and the coordinate representation type.
*
* This class is designed to work as a VectorInterpolateImageFunction,
* hence the IsInsideBuffer(PointType p) is overridden to always
* answer true
*
* This function works for N-dimensional images.
*
* \author Tom Vercauteren, INRIA & Mauna Kea Technologies
*
* \warning This function work only for Vector images. For
* scalar images use LinearInterpolateImageFunction.
*
* This paper was contributed in the Insight Journal paper:
* http://hdl.handle.net/1926/510
*
* \ingroup ImageFunctions ImageInterpolators
*
*/
template <class TInputImage, class TCoordRep = float>
class ITK_EXPORT VectorLinearInterpolateNearestNeighborExtrapolateImageFunction :
public VectorInterpolateImageFunction<TInputImage,TCoordRep>
{
public:
/** Standard class typedefs. */
typedef VectorLinearInterpolateNearestNeighborExtrapolateImageFunction Self;
typedef VectorInterpolateImageFunction<TInputImage,TCoordRep> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(VectorLinearInterpolateNearestNeighborExtrapolateImageFunction,
VectorInterpolateImageFunction);
/** InputImageType typedef support. */
typedef typename Superclass::InputImageType InputImageType;
typedef typename Superclass::PixelType PixelType;
typedef typename Superclass::ValueType ValueType;
typedef typename Superclass::RealType RealType;
typedef typename Superclass::PointType PointType;
/** Grab the vector dimension from the superclass. */
itkStaticConstMacro(Dimension, unsigned int,
Superclass::Dimension);
/** Dimension underlying input image. */
itkStaticConstMacro(ImageDimension, unsigned int,Superclass::ImageDimension);
/** Index typedef support. */
typedef typename Superclass::IndexType IndexType;
typedef typename Superclass::IndexValueType IndexValueType;
/** ContinuousIndex typedef support. */
typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
/** Output type is Vector<double,Dimension> */
typedef typename Superclass::OutputType OutputType;
/** Should check if an index is inside the image buffer, however we
* require that it answers true to use the extrapolation possibility. */
virtual bool IsInsideBuffer( const IndexType & ) const
{
return true;
}
/** Should check if a point is inside the image buffer, however we
* require that it answers true to use the extrapolation possibility. */
virtual bool IsInsideBuffer( const PointType & ) const
{
return true;
}
/** Should check if a continuous index is inside the image buffer, however we
* require that it answers true to use the extrapolation possibility. */
virtual bool IsInsideBuffer( const ContinuousIndexType & ) const
{
return true;
}
/** Evaluate the function at a ContinuousIndex position
*
* Returns the linearly interpolated image intensity at a
* specified point position. If the point does not lie within the
* image buffer a nearest neighbor interpolation is done. */
virtual OutputType EvaluateAtContinuousIndex(
const ContinuousIndexType & index ) const;
/** Evaluate the function at an index position
*
* Simply returns the image value at the
* specified index position. If the index does not lie within the
* image buffer a nearest neighbor interpolation is done. */
virtual OutputType EvaluateAtIndex( const IndexType & index ) const;
protected:
VectorLinearInterpolateNearestNeighborExtrapolateImageFunction();
virtual ~VectorLinearInterpolateNearestNeighborExtrapolateImageFunction() {}
virtual void PrintSelf(std::ostream& os, Indent indent) const;
private:
VectorLinearInterpolateNearestNeighborExtrapolateImageFunction(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
/** Number of neighbors used in the interpolation */
static const unsigned long m_Neighbors;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction.txx"
#endif
#endif
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