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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkInterpolateImageFunction.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:40 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef _itkInterpolateImageFunction_h |
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#define _itkInterpolateImageFunction_h |
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#include "itkImageFunction.h" |
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namespace itk |
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{ |
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/** \class InterpolateImageFunction |
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* \brief Base class for all image interpolaters. |
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* |
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* InterpolateImageFunction is the base for all ImageFunctions that |
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* interpolates image intensity at a non-integer pixel position. |
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* This class is templated over the input image type and the |
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* coordinate representation type (e.g. float or double ). |
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* |
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* \warning This heirarchy of functions work only for images |
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* with scalar pixel types. For images of vector pixel types |
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* use VectorInterpolateImageFunctions. |
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* |
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* \sa VectorInterpolateImageFunction |
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* \ingroup ImageFunctions ImageInterpolators |
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* |
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* */ |
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template <class TInputImage, class TCoordRep = float> |
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class ITK_EXPORT InterpolateImageFunction : |
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**public ImageFunction< TInputImage, |
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ITK_TYPENAME NumericTraits<typename TInputImage::PixelType>::RealType, TCoordRep > |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef InterpolateImageFunction Self; |
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typedef ImageFunction<TInputImage,typename NumericTraits<typename TInputImage::PixelType>::RealType,TCoordRep> Superclass; |
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TDA |
typedef SmartPointer<Self> Pointer; |
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typedef SmartPointer<const Self> ConstPointer; |
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/** Run-time type information (and related methods). */ |
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itkTypeMacro(InterpolateImageFunction, ImageFunction); |
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/** OutputType typedef support. */ |
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typedef typename Superclass::OutputType OutputType; |
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/** InputImageType typedef support. */ |
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typedef typename Superclass::InputImageType InputImageType; |
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/** Dimension underlying input image. */ |
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itkStaticConstMacro(ImageDimension, unsigned int, |
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Superclass::ImageDimension); |
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/** Point typedef support. */ |
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typedef typename Superclass::PointType PointType; |
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/** Index typedef support. */ |
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typedef typename Superclass::IndexType IndexType; |
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/** ContinuousIndex typedef support. */ |
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typedef typename Superclass::ContinuousIndexType ContinuousIndexType; |
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/** RealType typedef support. */ |
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typedef typename NumericTraits<typename TInputImage::PixelType>::RealType RealType; |
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/** Interpolate the image at a point position |
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* |
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* Returns the interpolated image intensity at a |
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* specified point position. No bounds checking is done. |
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* The point is assume to lie within the image buffer. |
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* |
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* ImageFunction::IsInsideBuffer() can be used to check bounds before |
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* calling the method. */ |
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virtual OutputType Evaluate( const PointType& point ) const |
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{ |
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ContinuousIndexType index; |
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this->GetInputImage()->TransformPhysicalPointToContinuousIndex( point, index ); |
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return ( this->EvaluateAtContinuousIndex( index ) ); |
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} |
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/** Interpolate the image at a continuous index position |
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* |
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* Returns the interpolated image intensity at a |
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* specified index position. No bounds checking is done. |
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* The point is assume to lie within the image buffer. |
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* |
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* Subclasses must override this method. |
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* |
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* ImageFunction::IsInsideBuffer() can be used to check bounds before |
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* calling the method. */ |
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virtual OutputType EvaluateAtContinuousIndex( |
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const ContinuousIndexType & index ) const = 0; |
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/** Interpolate the image at an index position. |
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* |
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* Simply returns the image value at the |
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* specified index position. No bounds checking is done. |
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* The point is assume to lie within the image buffer. |
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* |
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* ImageFunction::IsInsideBuffer() can be used to check bounds before |
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* calling the method. */ |
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virtual OutputType EvaluateAtIndex( const IndexType & index ) const |
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{ |
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return ( static_cast<RealType>( this->GetInputImage()->GetPixel( index ) ) ); |
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} |
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protected: |
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InterpolateImageFunction(){}; |
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~InterpolateImageFunction(){}; |
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void PrintSelf(std::ostream& os, Indent indent) const |
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{ Superclass::PrintSelf( os, indent ); } |
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private: |
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InterpolateImageFunction( const Self& ); //purposely not implemented |
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void operator=( const Self& ); //purposely not implemented |
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}; |
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} // namespace itk |
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#endif |
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