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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkVectorImageNeighborhoodAccessorFunctor.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:49 $ |
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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 __itkVectorImageNeighborhoodAccessorFunctor_h |
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#define __itkVectorImageNeighborhoodAccessorFunctor_h |
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#include "itkVariableLengthVector.h" |
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#include "itkImageBoundaryCondition.h" |
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#include "itkNeighborhood.h" |
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#include "itkImageBase.h" |
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namespace itk |
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{ |
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/** \class VectorImageNeighborhoodAccessorFunctor |
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* \brief Provides accessor interfaces to Access pixels and is meant to be |
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* used on pointers to pixels held by the Neighborhood class. |
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* |
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* A typical user should not need to use this class. The class is internally |
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* used by the neighborhood iterators. |
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* |
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* \note |
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* This work is part of the National Alliance for Medical Image Computing |
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* (NAMIC), funded by the National Institutes of Health through the NIH Roadmap |
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* for Medical Research, Grant U54 EB005149. |
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***/ |
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template< class TImage > |
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class VectorImageNeighborhoodAccessorFunctor |
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{ |
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public: |
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typedef TImage ImageType; |
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typedef typename ImageType::PixelType PixelType; |
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typedef typename ImageType::InternalPixelType InternalPixelType; |
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typedef unsigned int VectorLengthType; |
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typedef typename ImageType::OffsetType OffsetType; |
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typedef Neighborhood< InternalPixelType *, |
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::itk::GetImageDimension< TImage >::ImageDimension> NeighborhoodType; |
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typedef ImageBoundaryCondition< ImageType > const |
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***************************ImageBoundaryConditionConstPointerType; |
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VectorImageNeighborhoodAccessorFunctor( VectorLengthType length ) |
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******: m_VectorLength( length ), m_OffsetMultiplier( length -1 ) { }; |
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VectorImageNeighborhoodAccessorFunctor() |
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******: m_VectorLength( 0 ), m_OffsetMultiplier( 0 ) {}; |
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/** Set the pointer index to the start of the buffer. |
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* This must be set by the iterators to the starting location of the buffer. |
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* Typically a neighborhood iterator iterating on a neighborhood of an Image, |
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* say \c image will set this in its constructor. For instance: |
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* |
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* \code |
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* ConstNeighborhoodIterator( radius, image, ) |
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* { |
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**** ... |
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**** m_NeighborhoodAccessorFunctor.SetBegin( image->GetBufferPointer() ); |
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**** } |
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* \endcode |
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*/ |
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inline void SetBegin( const InternalPixelType * begin ) |
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{ this->m_Begin = const_cast< InternalPixelType * >( begin ); } |
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/** Method to dereference a pixel pointer. This is used from the |
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* ConstNeighborhoodIterator as the equivalent operation to (*it). |
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* This method should be preferred over the former (*it) notation. |
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* The reason is that dereferencing a pointer to a location of |
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* VectorImage pixel involves a different operation that simply |
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* dereferencing the pointer. Here a PixelType (array of InternalPixelType s) |
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* is created on the stack and returned. */ |
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inline PixelType Get( const InternalPixelType *pixelPointer ) const |
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{ |
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return PixelType(pixelPointer+(pixelPointer-m_Begin)*m_OffsetMultiplier, m_VectorLength); |
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} |
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/** Method to set the pixel value at a certain pixel pointer */ |
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inline void Set( InternalPixelType* &pixelPointer, const PixelType &p ) const |
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{ |
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InternalPixelType *truePixelPointer = |
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******pixelPointer + (pixelPointer-m_Begin)*m_OffsetMultiplier; |
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for( VectorLengthType i=0; i< m_VectorLength; i++ ) |
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{ |
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truePixelPointer[i] = p[i]; |
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} |
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} |
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inline PixelType BoundaryCondition( |
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const OffsetType& point_index, |
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const OffsetType &boundary_offset, |
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const NeighborhoodType *data, |
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const ImageBoundaryConditionConstPointerType boundaryCondition) const |
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{ |
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return boundaryCondition->operator()(point_index, boundary_offset, data, *this); |
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} |
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/** Methods to Set/Get vector length. This should be the length of a block of |
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* pixels in the VectorImage. */ |
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void SetVectorLength( VectorLengthType length ) |
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{ |
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m_VectorLength = length; |
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m_OffsetMultiplier = length - 1; |
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} |
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/** Methods to Set/Get vector length. This should be the length of a block of |
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* pixels in the VectorImage. */ |
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VectorLengthType GetVectorLength() |
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{ |
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return m_VectorLength; |
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} |
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private: |
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***VectorLengthType m_VectorLength; |
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***VectorLengthType m_OffsetMultiplier; // m_OffsetMultiplier = m_VectorLength-1 |
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****************************************// (precomputed for speedup). |
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***InternalPixelType *m_Begin; // Begin of the buffer. |
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}; |
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} // end namespace itk |
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#endif |
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