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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkNearestNeighborInterpolateImageFunction.h,v $
Language: C++
Date: $Date: 2006-02-06 22:01:57 $
Version: $Revision: 1.12 $
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 __itkNearestNeighborInterpolateImageFunction_h
#define __itkNearestNeighborInterpolateImageFunction_h
#include "itkInterpolateImageFunction.h"
namespace itk
{
/** \class NearestNeighborInterpolateImageFunction
* \brief Nearest neighbor interpolation of a scalar image.
*
* NearestNeighborInterpolateImageFunction interpolates image intensity at
* a non-integer pixel position by copying the intensity for the nearest
* neighbor. This class is templated
* over the input image type and the coordinate representation type
* (e.g. float or double).
*
* \ingroup ImageFunctions ImageInterpolators
*/
template <class TInputImage, class TCoordRep = float>
class ITK_EXPORT NearestNeighborInterpolateImageFunction :
public InterpolateImageFunction<TInputImage,TCoordRep>
{
public:
/** Standard class typedefs. */
typedef NearestNeighborInterpolateImageFunction Self;
typedef InterpolateImageFunction<TInputImage,TCoordRep> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods). */
itkTypeMacro(NearestNeighborInterpolateImageFunction,
InterpolateImageFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** 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);
/** Index typedef support. */
typedef typename Superclass::IndexType IndexType;
/** ContinuousIndex typedef support. */
typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
/** Evaluate the function at a ContinuousIndex position
*
* Returns the interpolated image intensity at a
* specified point position. No bounds checking is done.
* The point is assume to lie within the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
virtual OutputType EvaluateAtContinuousIndex(
const ContinuousIndexType & index ) const
{
IndexType nindex;
this->ConvertContinuousIndexToNearestIndex(index, nindex);
return static_cast<OutputType>( this->GetInputImage()->GetPixel( nindex ) );
}
protected:
NearestNeighborInterpolateImageFunction(){};
~NearestNeighborInterpolateImageFunction(){};
void PrintSelf(std::ostream& os, Indent indent) const
{ Superclass::PrintSelf( os, indent ); }
private:
NearestNeighborInterpolateImageFunction(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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