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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkImageBase.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:36 $ |
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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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Portions of this code are covered under the VTK copyright. |
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See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.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 __itkImageBase_h |
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#define __itkImageBase_h |
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#include "itkDataObject.h" |
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#include "itkProcessObject.h" |
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#include "itkIndex.h" |
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#include "itkOffset.h" |
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#include "itkSize.h" |
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#include "itkFixedArray.h" |
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#include "itkPoint.h" |
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#include "itkMatrix.h" |
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#include "itkImageHelper.h" |
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#include <vnl/vnl_matrix_fixed.txx> |
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#include "itkImageRegion.h" |
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namespace itk |
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{ |
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/** |
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* Due to a bug in MSVC, an enum value cannot be accessed out of a template |
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* parameter until the template class opens. In order for templated classes |
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* to access the dimension of an image template parameter in defining their |
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* own dimension, this class is needed as a work-around. |
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*/ |
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template <typename TImage> |
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struct GetImageDimension |
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{ |
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itkStaticConstMacro(ImageDimension, unsigned int, TImage::ImageDimension); |
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}; |
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/** \class ImageBase |
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* \brief Base class for templated image classes. |
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* |
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* ImageBase is the base class for the templated Image |
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* classes. ImageBase is templated over the dimension of the image. It |
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* provides the API and ivars that depend solely on the dimension of |
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* the image. ImageBase does not store any of the image (pixel) data. |
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* Storage for the pixels and the pixel access methods are defined in |
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* subclasses of ImageBase, namely Image and ImageAdaptor. |
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* |
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* There are three sets of meta-data describing an image. These are "Region" |
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* objects that define a portion of an image via a starting index for the |
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* image array and a size. The ivar LargestPossibleRegion defines the size |
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* and starting index of the image dataset. The entire image dataset, however, |
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* may not be resident in memory. The region of the image that is resident in |
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* memory is defined by the "BufferedRegion". The Buffer is a contiguous block |
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* of memory. The third set of meta-data defines a region of interest, called |
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* the "RequestedRegion". The RequestedRegion is used by the pipeline |
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* execution model to define what a filter is requested to produce. |
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* |
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* [RegionIndex, RegionSize] C [BufferIndex, BufferSize] |
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* C [ImageIndex, ImageSize] |
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* |
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* \ingroup ImageObjects |
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* \ingroup ITKSystemObjects |
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* |
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*/ |
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template<unsigned int VImageDimension=2> |
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class ITK_EXPORT ImageBase : public DataObject |
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{ |
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public: |
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/** Standard typedefs. */ |
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typedef ImageBase Self; |
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TDA |
typedef DataObject Superclass; |
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typedef SmartPointer<Self> Pointer; |
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TDA |
typedef SmartPointer<const Self> ConstPointer; |
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/** Method for creation through the object factory. */ |
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itkNewMacro(Self); |
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/** Run-time type information (and related methods). */ |
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itkTypeMacro(ImageBase, DataObject); |
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/** Dimension of the image. This constant is used by functions that are |
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* templated over image type (as opposed to being templated over pixel |
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* type and dimension) when they need compile time access to the dimension |
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* of the image. */ |
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itkStaticConstMacro(ImageDimension, unsigned int, VImageDimension ); |
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/** Index typedef support. An index is used to access pixel values. */ |
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typedef Index<VImageDimension> IndexType; |
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TDA |
typedef typename IndexType::IndexValueType IndexValueType; |
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/** Offset typedef support. An offset represent relative position |
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* between indices. */ |
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typedef Offset<VImageDimension> OffsetType; |
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TDA |
typedef typename OffsetType::OffsetValueType OffsetValueType; |
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/** Size typedef support. A size is used to define region bounds. */ |
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typedef Size<VImageDimension> SizeType; |
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TDA |
typedef typename SizeType::SizeValueType SizeValueType; |
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|
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LEN |
/** Region typedef support. A region is used to specify a subset of an image. */ |
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typedef ImageRegion<VImageDimension> RegionType; |
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/** Spacing typedef support. Spacing holds the size of a pixel. The |
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* spacing is the geometric distance between image samples. ITK only |
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* supports positive spacing value: negative values may cause |
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* undesirable results.*/ |
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typedef Vector<double, VImageDimension> SpacingType; |
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|
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/** Origin typedef support. The origin is the geometric coordinates |
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* of the index (0,0). */ |
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typedef Point<double, VImageDimension> PointType; |
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/** Direction typedef support. The Direction is a matix of |
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* direction cosines that specify the direction between samples. */ |
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typedef Matrix<double, VImageDimension, VImageDimension> DirectionType; |
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/** Restore object to initialized state. */ |
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void Initialize(); |
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/** Image dimension. The dimension of an image is fixed at construction. */ |
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static unsigned int GetImageDimension() |
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{ return VImageDimension; } |
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/** Set the origin of the image. The origin is the geometric |
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* coordinates of the image origin. It is stored internally |
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* as double but may be set from float. |
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* \sa GetOrigin() */ |
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itkSetMacro(Origin, PointType); |
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virtual void SetOrigin( const double origin[VImageDimension] ); |
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virtual void SetOrigin( const float origin[VImageDimension] ); |
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/** Set the direction cosines of the image. The direction cosines |
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* are vectors that point from one pixel to the next. |
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* \sa GetDirection() */ |
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virtual void SetDirection( const DirectionType direction ); |
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/** Get the direction cosines of the image. The direction cosines |
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* are vectors that point from one pixel to the next. |
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* For ImageBase and Image, the default direction is identity. */ |
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itkGetConstReferenceMacro(Direction, DirectionType); |
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/** Set the spacing (size of a pixel) of the image. The |
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* spacing is the geometric distance between image samples. |
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* It is stored internally as double, but may be set from |
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* float. \sa GetSpacing() */ |
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itkSetMacro(Spacing, SpacingType); |
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virtual void SetSpacing( const double spacing[VImageDimension] ); |
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virtual void SetSpacing( const float spacing[VImageDimension] ); |
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/** Get the spacing (size of a pixel) `of the image. The |
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* spacing is the geometric distance between image samples. |
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* The value returned is a pointer to a double array. |
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* For ImageBase and Image, the default data spacing is unity. */ |
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itkGetConstReferenceMacro(Spacing, SpacingType); |
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/** Get the origin of the image. The origin is the geometric |
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* coordinates of the index (0,0). The value returned is a pointer |
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* to a double array. For ImageBase and Image, the default origin is |
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* 0. */ |
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itkGetConstReferenceMacro(Origin, PointType); |
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/** Set the region object that defines the size and starting index |
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* for the largest possible region this image could represent. This |
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* is used in determining how much memory would be needed to load an |
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* entire dataset. It is also used to determine boundary |
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* conditions. |
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* \sa ImageRegion, SetBufferedRegion(), SetRequestedRegion() */ |
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virtual void SetLargestPossibleRegion(const RegionType ®ion); |
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/** Get the region object that defines the size and starting index |
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* for the largest possible region this image could represent. This |
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* is used in determining how much memory would be needed to load an |
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* entire dataset. It is also used to determine boundary |
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* conditions. |
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* \sa ImageRegion, GetBufferedRegion(), GetRequestedRegion() */ |
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virtual const RegionType& GetLargestPossibleRegion() const |
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{ return m_LargestPossibleRegion;}; |
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/** Set the region object that defines the size and starting index |
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* of the region of the image currently loaded in memory. |
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* \sa ImageRegion, SetLargestPossibleRegion(), SetRequestedRegion() */ |
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virtual void SetBufferedRegion(const RegionType ®ion); |
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/** Get the region object that defines the size and starting index |
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* of the region of the image currently loaded in memory. |
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* \sa ImageRegion, SetLargestPossibleRegion(), SetRequestedRegion() */ |
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virtual const RegionType& GetBufferedRegion() const |
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**{ return m_BufferedRegion;}; |
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/** Set the region object that defines the size and starting index |
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* for the region of the image requested (i.e., the region of the |
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* image to be operated on by a filter). Setting the RequestedRegion |
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* does not cause the object to be modified. This method is called |
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* internally by the pipeline and therefore bypasses the modified |
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* time calculation. |
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* \sa ImageRegion, SetLargestPossibleRegion(), SetBufferedRegion() */ |
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virtual void SetRequestedRegion(const RegionType ®ion); |
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/** Set the requested region from this data object to match the requested |
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* region of the data object passed in as a parameter. This method |
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* implements the API from DataObject. The data object parameter must be |
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* castable to an ImageBase. Setting the RequestedRegion does not cause |
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* the object to be modified. This method is called internally by |
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* the pipeline and therefore bypasses the modified time |
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* calculation. */ |
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virtual void SetRequestedRegion(DataObject *data); |
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/** Get the region object that defines the size and starting index |
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* for the region of the image requested (i.e., the region of the |
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* image to be operated on by a filter). |
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* \sa ImageRegion, SetLargestPossibleRegion(), SetBufferedRegion() */ |
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virtual const RegionType& GetRequestedRegion() const |
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**{ return m_RequestedRegion;}; |
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/** Get the offset table. The offset table gives increments for |
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* moving from one pixel to next in the current row, column, slice, |
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* etc.. This table if of size [VImageDimension+1], because its |
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* values are computed progressively as: {1, N1, N1*N2, |
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**** N1*N2*N3,...,(N1*...*Nn)} Where the values {N1,...,Nn} are the |
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* elements of the BufferedRegion::Size array. The last element of |
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* the OffsetTable is equivalent to the BufferSize. Having a |
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* [VImageDimension+1] size array, simplifies the implementation of |
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* some data accessing algorithms. The entries in the offset table |
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* are only valid after the BufferedRegion is set. */ |
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const OffsetValueType *GetOffsetTable() const { return m_OffsetTable; }; |
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/** Compute an offset from the beginning of the buffer for a pixel |
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* at the specified index. The index is not checked as to whether it |
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* is inside the current buffer, so the computed offset could |
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* conceivably be outside the buffer. If bounds checking is needed, |
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* one can call ImageRegion::IsInside(ind) on the BufferedRegion |
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* prior to calling ComputeOffset. */ |
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#if 1 |
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inline OffsetValueType ComputeOffset(const IndexType &ind) const |
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**{ |
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OffsetValueType offset = 0; |
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ImageHelper<VImageDimension,VImageDimension>::ComputeOffset(this->GetBufferedRegion().GetIndex(), |
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****************************************************************ind, |
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****************************************************************m_OffsetTable, |
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****************************************************************offset); |
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return offset; |
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**} |
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#else |
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OffsetValueType ComputeOffset(const IndexType &ind) const |
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**{ |
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// need to add bounds checking for the region/buffer? |
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OffsetValueType offset=0; |
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const IndexType &bufferedRegionIndex = this->GetBufferedRegion().GetIndex(); |
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// data is arranged as [][][][slice][row][col] |
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// with Index[0] = col, Index[1] = row, Index[2] = slice |
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for (int i=VImageDimension-1; i > 0; i--) |
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{ |
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offset += (ind[i] - bufferedRegionIndex[i])*m_OffsetTable[i]; |
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} |
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offset += (ind[0] - bufferedRegionIndex[0]); |
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return offset; |
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**} |
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#endif |
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/** Compute the index of the pixel at a specified offset from the |
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* beginning of the buffered region. Bounds checking is not |
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* performed. Thus, the computed index could be outside the |
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* BufferedRegion. To ensure a valid index, the parameter "offset" |
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* should be between 0 and the number of pixels in the |
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* BufferedRegion (the latter can be found using |
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* ImageRegion::GetNumberOfPixels()). */ |
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#if 1 |
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inline IndexType ComputeIndex(OffsetValueType offset) const |
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**{ |
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IndexType index; |
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const IndexType &bufferedRegionIndex = this->GetBufferedRegion().GetIndex(); |
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LEN |
ImageHelper<VImageDimension,VImageDimension>::ComputeIndex(bufferedRegionIndex, |
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offset, |
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m_OffsetTable, |
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index); |
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return index; |
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**} |
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#else |
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IndexType ComputeIndex(OffsetValueType offset) const |
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**{ |
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IndexType index; |
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const IndexType &bufferedRegionIndex = this->GetBufferedRegion().GetIndex(); |
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for (int i=VImageDimension-1; i > 0; i--) |
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{ |
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index[i] = static_cast<IndexValueType>(offset / m_OffsetTable[i]); |
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offset -= (index[i] * m_OffsetTable[i]); |
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index[i] += bufferedRegionIndex[i]; |
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} |
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index[0] = bufferedRegionIndex[0] + static_cast<IndexValueType>(offset); |
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return index; |
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**} |
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#endif |
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/** Copy information from the specified data set. This method is |
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* part of the pipeline execution model. By default, a ProcessObject |
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* will copy meta-data from the first input to all of its |
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* outputs. See ProcessObject::GenerateOutputInformation(). Each |
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* subclass of DataObject is responsible for being able to copy |
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WCM |
* whatever meta-data it needs from from another DataObject. |
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* ImageBase has more meta-data than its DataObject. Thus, it must |
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* provide its own version of CopyInformation() in order to copy the |
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* LargestPossibleRegion from the input parameter. */ |
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virtual void CopyInformation(const DataObject *data); |
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/** Graft the data and information from one image to another. This |
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* is a convenience method to setup a second image with all the meta |
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* information of another image and use the same pixel |
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* container. Note that this method is different than just using two |
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* SmartPointers to the same image since separate DataObjects are |
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* still maintained. This method is similar to |
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* ImageSource::GraftOutput(). The implementation in ImageBase |
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* simply calls CopyInformation() and copies the region ivars. |
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* Subclasses of ImageBase are responsible for copying the pixel |
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* container. */ |
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virtual void Graft(const DataObject *data); |
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|
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/** Update the information for this DataObject so that it can be used |
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* as an output of a ProcessObject. This method is used the pipeline |
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* mechanism to propagate information and initialize the meta data |
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* associated with a DataObject. This method calls its source's |
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* ProcessObject::UpdateOutputInformation() which determines modified |
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* times, LargestPossibleRegions, and any extra meta data like spacing, |
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* origin, etc. */ |
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virtual void UpdateOutputInformation(); |
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/** Set the RequestedRegion to the LargestPossibleRegion. This |
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* forces a filter to produce all of the output in one execution |
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* (i.e. not streaming) on the next call to Update(). */ |
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virtual void SetRequestedRegionToLargestPossibleRegion(); |
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/** Determine whether the RequestedRegion is outside of the |
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* BufferedRegion. This method returns true if the RequestedRegion |
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* is outside the BufferedRegion (true if at least one pixel is |
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* outside). This is used by the pipeline mechanism to determine |
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* whether a filter needs to re-execute in order to satisfy the |
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* current request. If the current RequestedRegion is already |
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* inside the BufferedRegion from the previous execution (and the |
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* current filter is up to date), then a given filter does not need |
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* to re-execute */ |
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virtual bool RequestedRegionIsOutsideOfTheBufferedRegion(); |
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/** Verify that the RequestedRegion is within the |
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* LargestPossibleRegion. If the RequestedRegion is not within the |
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* LargestPossibleRegion, then the filter cannot possible satisfy |
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* the request. This method returns true if the request can be |
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* satisfied and returns fails if the request cannot. This method is |
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* used by PropagateRequestedRegion(). PropagateRequestedRegion() |
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* throws a InvalidRequestedRegionError exception is the requested |
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* region is not within the LargestPossibleRegion. */ |
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virtual bool VerifyRequestedRegion(); |
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|
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protected: |
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ImageBase(); |
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~ImageBase(); |
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virtual void PrintSelf(std::ostream& os, Indent indent) const; |
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/** Calculate the offsets needed to move from one pixel to the next |
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* along a row, column, slice, volume, etc. These offsets are based |
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* on the size of the BufferedRegion. This should be called after |
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* the BufferedRegion is set. */ |
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void ComputeOffsetTable(); |
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|
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protected: |
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/** Origin and spacing of physical coordinates. This variables are |
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* protected for efficiency. They are referenced frequently by |
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* inner loop calculations. */ |
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SpacingType m_Spacing; |
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PointType m_Origin; |
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DirectionType m_Direction; |
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|
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private: |
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ImageBase(const Self&); //purposely not implemented |
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void operator=(const Self&); //purposely not implemented |
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|
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/** Returns/Sets the number of components in the image. Note that for all |
| 394 |
|
* images this is 1. Even for Image< RGBPixel< T >, 3 >. |
| 395 |
|
* This is > 1 only for time-series images such as itk::VectorImage. */ |
| 396 |
|
virtual unsigned int GetNumberOfComponentsPerPixel() const; |
| 397 |
|
virtual void SetNumberOfComponentsPerPixel( unsigned int ); // always 1 |
| 398 |
|
|
| 399 |
|
OffsetValueType m_OffsetTable[VImageDimension+1]; |
| 400 |
|
|
| 401 |
|
RegionType m_LargestPossibleRegion; |
| 402 |
|
RegionType m_RequestedRegion; |
| 403 |
|
RegionType m_BufferedRegion; |
| 404 |
|
}; |
| 405 |
|
|
| 406 |
|
#ifdef ITK_EXPLICIT_INSTANTIATION |
| 407 |
IND |
***extern template class ImageBase<2>; |
| 408 |
IND |
***extern template class ImageBase<3>; |
| 409 |
|
#endif |
| 410 |
|
|
| 411 |
|
} // end namespace itk |
| 412 |
|
|
| 413 |
|
#ifndef ITK_MANUAL_INSTANTIATION |
| 414 |
|
#include "itkImageBase.txx" |
| 415 |
|
#endif |
| 416 |
|
|
| 417 |
|
#endif |
| 418 |
|
|
| 419 |
EOF |
|