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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkNeighborhood.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:42 $ |
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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 __itkNeighborhood_h |
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#define __itkNeighborhood_h |
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#include <iostream> |
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#include "itkNeighborhoodAllocator.h" |
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#include "itkSize.h" |
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#include "itkIndent.h" |
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#include "itkSliceIterator.h" |
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#include "vnl/vnl_vector.h" |
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#include "itkOffset.h" |
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#include <vector> |
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namespace itk { |
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/** \class Neighborhood |
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* \brief A light-weight container object for storing an N-dimensional |
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* neighborhood of values. |
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* |
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* This class serves as the base class for several other Itk objects such as |
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* itk::NeighborhoodOperator and itk::NeighborhoodIterator. Its purpose is to |
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* store values and their relative spatial locations. |
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* |
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* A Neighborhood has an N-dimensional \em radius. The radius is defined |
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* separately for each dimension as the number of pixels that the neighborhood |
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* extends outward from the center pixel. For example, a 2D Neighborhood |
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* object with a radius of 2x3 has sides of length 5x7. Neighborhood objects |
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* always have an unambiguous center because their side lengths are always odd. |
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* |
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* \sa Neighborhood |
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* \sa NeighborhoodIterator |
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* |
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* \ingroup Operators |
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* \ingroup ImageIterators |
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*/ |
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template<class TPixel, unsigned int VDimension = 2, |
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class TAllocator = NeighborhoodAllocator<TPixel> > |
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class ITK_EXPORT Neighborhood |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef Neighborhood Self; |
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/** External support for allocator type. */ |
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typedef TAllocator AllocatorType; |
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/** External support for dimensionality. */ |
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itkStaticConstMacro(NeighborhoodDimension, unsigned int, VDimension); |
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/** External support for pixel type. */ |
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typedef TPixel PixelType; |
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/** Iterator typedef support. Note the naming is intentional, i.e., |
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*** ::iterator and ::const_iterator, because the allocator may be a |
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*** vnl object or other type, which uses this form. */ |
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typedef typename AllocatorType::iterator Iterator; |
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TDA |
typedef typename AllocatorType::const_iterator ConstIterator; |
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/** Size and value typedef support. */ |
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typedef Size<VDimension> SizeType; |
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TDA |
typedef typename SizeType::SizeValueType SizeValueType; |
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/** Radius typedef support. */ |
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typedef Size<VDimension> RadiusType; |
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/** Offset type used to reference neighbor locations */ |
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typedef Offset<VDimension> OffsetType; |
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/** External slice iterator type typedef support. */ |
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typedef SliceIterator<TPixel, Self> SliceIteratorType; |
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/** Default constructor. */ |
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Neighborhood() { m_Radius.Fill(0); m_Size.Fill(0); } |
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/** Default destructor. */ |
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virtual ~Neighborhood() {} |
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/** Copy constructor. */ |
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Neighborhood(const Self& other); |
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/** Assignment operator. */ |
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Self &operator=(const Self& other); |
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/** Comparison operator. */ |
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bool |
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operator==(const Self& other) const |
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**{ |
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return (m_Radius == other.m_Radius && |
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m_Size == other.m_Size && |
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m_DataBuffer == other.m_DataBuffer); |
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**} |
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/** Not Equal operator. */ |
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bool operator!=(const Self& other) const |
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**{ |
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return (m_Radius != other.m_Radius || |
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m_Size != other.m_Size || |
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m_DataBuffer != other.m_DataBuffer); |
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**} |
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/** Returns the radius of the neighborhood. */ |
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const SizeType GetRadius() const |
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{ return m_Radius; } |
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/** Returns the radius of the neighborhood along a specified |
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* dimension. */ |
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unsigned long GetRadius(const unsigned long n) const |
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{ return m_Radius[n]; } |
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/** Returns the size (total length) of the neighborhood along |
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* a specified dimension. */ |
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unsigned long GetSize(const unsigned long n) const |
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{ return m_Size[n]; } |
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/** Returns the size (total length of sides) of the neighborhood. */ |
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SizeType GetSize() const |
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{ return m_Size; } |
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/** Returns the stride length for the specified dimension. Stride |
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* length is the number of pixels between adjacent pixels along the |
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* given dimension. */ |
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unsigned GetStride(const unsigned axis) const |
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**{ return m_StrideTable[axis]; } |
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/** STL-style iterator support. */ |
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Iterator End() |
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{ return m_DataBuffer.end(); } |
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Iterator Begin() |
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{ return m_DataBuffer.begin(); } |
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ConstIterator End() const |
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{ return m_DataBuffer.end(); } |
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ConstIterator Begin() const |
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{ return m_DataBuffer.begin(); } |
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/** More STL-style support. */ |
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unsigned int Size() const |
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{ return m_DataBuffer.size(); } |
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/** Pass-through data access methods to the buffer. */ |
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TPixel &operator[](unsigned int i) |
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{ return m_DataBuffer[i]; } |
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const TPixel &operator[](unsigned int i) const |
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**{ return m_DataBuffer[i]; } |
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TPixel &GetElement(unsigned int i) |
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**{ return m_DataBuffer[i]; } |
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/** Returns the element at the center of the neighborhood. */ |
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TPixel GetCenterValue() const |
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**{ return (this->operator[]((this->Size())>>1)); } |
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/** Sets the radius for the neighborhood, calculates size from the |
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* radius, and allocates storage. */ |
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void SetRadius(const SizeType &); |
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/** Sets the radius for the neighborhood. Overloaded to support an unsigned |
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* long array. */ |
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void SetRadius(const unsigned long *rad) |
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**{ |
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SizeType s; |
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memcpy(s.m_Size, rad, sizeof(unsigned long) * VDimension); |
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this->SetRadius(s); |
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**} |
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/** Overloads SetRadius to allow a single long integer argument |
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* that is used as the radius of all the dimensions of the |
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* Neighborhood (resulting in a "square" neighborhood). */ |
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void SetRadius(const unsigned long); |
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/** Standard itk object method. */ |
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void Print(std::ostream& os) const |
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{ this->PrintSelf(os, Indent(0)); } |
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/** Returns a reference to the data buffer structure. */ |
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AllocatorType &GetBufferReference() |
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{ return m_DataBuffer; } |
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const AllocatorType &GetBufferReference() const |
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{ return m_DataBuffer; } |
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/** Get pixel value by offset */ |
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TPixel &operator[](const OffsetType &o) |
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**{ return this->operator[](this->GetNeighborhoodIndex(o)); } |
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const TPixel &operator[](const OffsetType &o) const |
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**{ return this->operator[](this->GetNeighborhoodIndex(o)); } |
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/** Returns the itk::Offset from the center of the Neighborhood to |
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******the requested neighbor index. */ |
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OffsetType GetOffset(unsigned int i) const |
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**{ return m_OffsetTable[i]; } |
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virtual unsigned int GetNeighborhoodIndex(const OffsetType &) const; |
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unsigned int GetCenterNeighborhoodIndex() const |
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**{ return static_cast<unsigned int>(this->Size()/2); } |
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std::slice GetSlice(unsigned int) const; |
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protected: |
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/** Sets the length along each dimension. */ |
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void SetSize() |
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**{ |
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for (unsigned int i=0; i<VDimension; ++i) |
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{ m_Size[i] = m_Radius[i]*2+1; } |
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} |
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/** Allocates the neighborhood's memory buffer. */ |
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virtual void Allocate(unsigned int i) |
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{ m_DataBuffer.set_size(i); } |
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/** Standard itk object method. */ |
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virtual void PrintSelf(std::ostream&, Indent) const; |
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/** Computes the entries for the stride table */ |
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virtual void ComputeNeighborhoodStrideTable(); |
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/** Fills entries into the offset lookup table. Called once on |
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initialization. */ |
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virtual void ComputeNeighborhoodOffsetTable(); |
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private: |
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/** Number of neighbors to include (symmetrically) along each axis. |
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* A neighborhood will always have odd-length axes (m_Radius[n]*2+1). */ |
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SizeType m_Radius; |
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/** Actual length of each dimension, calculated from m_Radius. |
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* A neighborhood will always have odd-length axes (m_Radius[n]*2+1). */ |
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SizeType m_Size; |
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/** The buffer in which data is stored. */ |
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AllocatorType m_DataBuffer; |
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/** A lookup table for keeping track of stride lengths in a neighborhood |
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i.e. the memory offsets between pixels along each dimensional axis */ |
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unsigned int m_StrideTable[VDimension]; |
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/** */ |
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std::vector<OffsetType> m_OffsetTable; |
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}; |
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template <class TPixel, unsigned int VDimension, class TContainer> |
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std::ostream & operator<<(std::ostream &os, const Neighborhood<TPixel,VDimension,TContainer> &neighborhood) |
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{ |
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os << "Neighborhood:" << std::endl; |
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os << " Radius:" << neighborhood.GetRadius() << std::endl; |
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os << " Size:" << neighborhood.GetSize() << std::endl; |
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os << " DataBuffer:" << neighborhood.GetBufferReference() << std::endl; |
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return os; |
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} |
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} // namespace itk |
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#ifndef ITK_MANUAL_INSTANTIATION |
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#include "itkNeighborhood.txx" |
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#endif |
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#endif |
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