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itk::ImageRegionConstIterator< TImage > Class Template Reference
[Image Iterators]

Multi-dimensional image iterator which only walks a region. More...

#include <itkImageRegionConstIterator.h>

Inheritance diagram for itk::ImageRegionConstIterator:

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Collaboration diagram for itk::ImageRegionConstIterator< TImage >:

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List of all members.

Public Types

typedef ImageRegionConstIterator Self
typedef ImageConstIterator<
TImage > 
Superclass
typedef Superclass::IndexType IndexType
typedef Superclass::SizeType SizeType
typedef Superclass::RegionType RegionType
typedef Superclass::ImageType ImageType
typedef Superclass::PixelContainer PixelContainer
typedef Superclass::PixelContainerPointer PixelContainerPointer
typedef Superclass::InternalPixelType InternalPixelType
typedef Superclass::PixelType PixelType
typedef Superclass::AccessorType AccessorType

Public Methods

 itkStaticConstMacro (ImageIteratorDimension, unsigned int, Superclass::ImageIteratorDimension)
virtual const char * GetClassName () const
 ImageRegionConstIterator ()
Self Begin (void) const
Self End (void) const
Selfoperator++ ()
Selfoperator-- ()
 ImageRegionConstIterator (const ImageType *ptr, const RegionType &region)
 ImageRegionConstIterator (const ImageIterator< TImage > &it)
 ImageRegionConstIterator (const ImageConstIterator< TImage > &it)
void SetIndex (const IndexType &ind)

Protected Attributes

unsigned long m_SpanBeginOffset
unsigned long m_SpanEndOffset

Detailed Description

template<typename TImage>
class itk::ImageRegionConstIterator< TImage >

Multi-dimensional image iterator which only walks a region.

See also:
ImageRegionIterator
ImageRegionConstIterator is a templated class to represent a multi-dimensional iterator. ImageRegionConstIterator is templated over the dimension of the image and the data type of the image. ImageRegionConstIterator is constrained to walk only within the specified region.

ImageRegionConstIterator provides read-only access to image data. Its behavior is similar to the one of ImageRegionIterator with the exception of lacking a Set() method.

ImageRegionConstIterator is a multi-dimensional iterator, requiring more information be specified before the iterator can be used than conventional iterators. Whereas the std::vector::iterator from the STL only needs to be passed a pointer to establish the iterator, the multi-dimensional image iterator needs a pointer, the size of the buffer, the size of the region, the start index of the buffer, and the start index of the region. To gain access to this information, ImageRegionConstIterator holds a reference to the image over which it is traversing.

ImageRegionConstIterator assumes a particular layout of the image data. The is arranged in a 1D array as if it were [][][][slice][row][col] with Index[0] = col, Index[1] = row, Index[2] = slice, etc.

operator++ provides a simple syntax for walking around a region of a multidimensional image. operator++ iterates across a row, constraining the movement to within a region of image. When the iterator reaches the boundary of the region along a row, the iterator automatically wraps to the next row, starting at the first pixel in the row that is part of the region. This allows for simple processing loops of the form:

      it = it.Begin();
      for (; !it.IsAtEnd(); ++it)
         {
         *it += 100.0;
         }

Definition at line 73 of file itkImageRegionConstIterator.h.


Member Typedef Documentation

template<typename TImage>
typedef Superclass::AccessorType itk::ImageRegionConstIterator< TImage >::AccessorType
 

Accessor type that convert data between internal and external representations.

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 116 of file itkImageRegionConstIterator.h.

template<typename TImage>
typedef Superclass::ImageType itk::ImageRegionConstIterator< TImage >::ImageType
 

Image typedef support. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc.

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 100 of file itkImageRegionConstIterator.h.

Referenced by itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator().

template<typename TImage>
typedef Superclass::IndexType itk::ImageRegionConstIterator< TImage >::IndexType
 

Index typedef support. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc.

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 89 of file itkImageRegionConstIterator.h.

Referenced by itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator().

template<typename TImage>
typedef Superclass::InternalPixelType itk::ImageRegionConstIterator< TImage >::InternalPixelType
 

Internal Pixel Type

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 109 of file itkImageRegionConstIterator.h.

template<typename TImage>
typedef Superclass::PixelContainer itk::ImageRegionConstIterator< TImage >::PixelContainer
 

PixelContainer typedef support. Used to refer to the container for the pixel data. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc.

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 105 of file itkImageRegionConstIterator.h.

template<typename TImage>
typedef Superclass::PixelContainerPointer itk::ImageRegionConstIterator< TImage >::PixelContainerPointer
 

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 106 of file itkImageRegionConstIterator.h.

template<typename TImage>
typedef Superclass::PixelType itk::ImageRegionConstIterator< TImage >::PixelType
 

External Pixel Type

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 112 of file itkImageRegionConstIterator.h.

template<typename TImage>
typedef Superclass::RegionType itk::ImageRegionConstIterator< TImage >::RegionType
 

Region typedef support.

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 96 of file itkImageRegionConstIterator.h.

Referenced by itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator().

template<typename TImage>
typedef ImageRegionConstIterator itk::ImageRegionConstIterator< TImage >::Self
 

Standard class typedef.

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 77 of file itkImageRegionConstIterator.h.

template<typename TImage>
typedef Superclass::SizeType itk::ImageRegionConstIterator< TImage >::SizeType
 

Size typedef support. While this was already typdef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc.

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 93 of file itkImageRegionConstIterator.h.

template<typename TImage>
typedef ImageConstIterator<TImage> itk::ImageRegionConstIterator< TImage >::Superclass
 

Reimplemented in itk::ImageRegionIterator< TImage >.

Definition at line 78 of file itkImageRegionConstIterator.h.


Constructor & Destructor Documentation

template<typename TImage>
itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator   [inline]
 

Default constructor. Needed since we provide a cast constructor.

Definition at line 122 of file itkImageRegionConstIterator.h.

References itk::ImageRegionConstIterator< TImage >::m_SpanBeginOffset, and itk::ImageRegionConstIterator< TImage >::m_SpanEndOffset.

template<typename TImage>
itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator const ImageType   ptr,
const RegionType   region
[inline]
 

Constructor establishes an iterator to walk a particular image and a particular region of that image.

Definition at line 130 of file itkImageRegionConstIterator.h.

References itk::ImageRegionConstIterator< TImage >::ImageType, itk::ImageConstIterator< TImage >::m_BeginOffset, itk::ImageConstIterator< TImage >::m_Region, itk::ImageRegionConstIterator< TImage >::m_SpanBeginOffset, itk::ImageRegionConstIterator< TImage >::m_SpanEndOffset, and itk::ImageRegionConstIterator< TImage >::RegionType.

template<typename TImage>
itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator const ImageIterator< TImage > &    it [inline]
 

Constructor that can be used to cast from an ImageIterator to an ImageRegionConstIterator. Many routines return an ImageIterator but for a particular task, you may want an ImageRegionConstIterator. Rather than provide overloaded APIs that return different types of Iterators, itk returns ImageIterators and uses constructors to cast from an ImageIterator to a ImageRegionConstIterator.

Definition at line 145 of file itkImageRegionConstIterator.h.

References itk::ImageConstIterator< TImage >::GetIndex(), itk::ImageRegionConstIterator< TImage >::IndexType, itk::ImageConstIterator< TImage >::m_Offset, itk::ImageConstIterator< TImage >::m_Region, itk::ImageRegionConstIterator< TImage >::m_SpanBeginOffset, and itk::ImageRegionConstIterator< TImage >::m_SpanEndOffset.

template<typename TImage>
itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator const ImageConstIterator< TImage > &    it [inline]
 

Constructor that can be used to cast from an ImageConstIterator to an ImageRegionConstIterator. Many routines return an ImageIterator but for a particular task, you may want an ImageRegionConstIterator. Rather than provide overloaded APIs that return different types of Iterators, itk returns ImageIterators and uses constructors to cast from an ImageIterator to a ImageRegionConstIterator.

Definition at line 162 of file itkImageRegionConstIterator.h.

References itk::ImageRegionConstIterator< TImage >::IndexType, itk::ImageConstIterator< TImage >::m_Offset, itk::ImageConstIterator< TImage >::m_Region, itk::ImageRegionConstIterator< TImage >::m_SpanBeginOffset, and itk::ImageRegionConstIterator< TImage >::m_SpanEndOffset.


Member Function Documentation

template<typename TImage>
Self itk::ImageRegionConstIterator< TImage >::Begin void    const
 

Return an iterator for the beginning of the region. "Begin" is defined as the first pixel in the region.

Deprecated:
Use GoToBegin() instead

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

template<typename TImage>
Self itk::ImageRegionConstIterator< TImage >::End void    const
 

Return an iterator for the end of the region. "End" is defined as one pixel past the last pixel of the region.

Deprecated:
Use GoToEnd() instead

Reimplemented from itk::ImageConstIterator< TImage >.

Reimplemented in itk::ImageRegionIterator< TImage >.

template<typename TImage>
virtual const char* itk::ImageRegionConstIterator< TImage >::GetClassName   const [virtual]
 

Run-time type information (and related methods).

template<typename TImage>
itk::ImageRegionConstIterator< TImage >::itkStaticConstMacro ImageIteratorDimension   ,
unsigned    int,
Superclass::ImageIteratorDimension   
 

Dimension of the image the iterator walks. This constant is needed so functions that are templated over image iterator type (as opposed to being templated over pixel type and dimension) can have compile time access to the dimension of the image that the iterator walks.

template<typename TImage>
Self& itk::ImageRegionConstIterator< TImage >::operator++   [inline]
 

Increment (prefix) the fastest moving dimension of the iterator's index. This operator will constrain the iterator within the region (i.e. the iterator will automatically wrap from the end of the row of the region to the beginning of the next row of the region) up until the iterator tries to moves past the last pixel of the region. Here, the iterator will be set to be one pixel past the end of the region.

See also:
operator++(int)

Definition at line 204 of file itkImageRegionConstIterator.h.

References itk::ImageConstIterator< TImage >::m_Image, itk::ImageConstIterator< TImage >::m_Offset, and itk::ImageConstIterator< TImage >::m_Region.

template<typename TImage>
Self& itk::ImageRegionConstIterator< TImage >::operator--   [inline]
 

Decrement (prefix) the fastest moving dimension of the iterator's index. This operator will constrain the iterator within the region (i.e. the iterator will automatically wrap from the beginning of the row of the region to the end of the next row of the region) up until the iterator tries to moves past the first pixel of the region. Here, the iterator will be set to be one pixel past the beginning of the region.

See also:
operator--(int)

Definition at line 261 of file itkImageRegionConstIterator.h.

References itk::ImageConstIterator< TImage >::m_Image, itk::ImageConstIterator< TImage >::m_Offset, and itk::ImageConstIterator< TImage >::m_Region.

template<typename TImage>
void itk::ImageRegionConstIterator< TImage >::SetIndex const IndexType   ind [inline, virtual]
 

Set the index. No bounds checking is performed. This is overridden from the parent because we have an extra ivar.

See also:
GetIndex

Reimplemented from itk::ImageConstIterator< TImage >.

Definition at line 187 of file itkImageRegionConstIterator.h.

References itk::ImageConstIterator< TImage >::m_Region, itk::ImageRegionConstIterator< TImage >::m_SpanBeginOffset, and itk::ImageRegionConstIterator< TImage >::m_SpanEndOffset.


Member Data Documentation

template<typename TImage>
unsigned long itk::ImageRegionConstIterator< TImage >::m_SpanBeginOffset [protected]
 

Definition at line 312 of file itkImageRegionConstIterator.h.

Referenced by itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator(), and itk::ImageRegionConstIterator< TImage >::SetIndex().

template<typename TImage>
unsigned long itk::ImageRegionConstIterator< TImage >::m_SpanEndOffset [protected]
 

Definition at line 313 of file itkImageRegionConstIterator.h.

Referenced by itk::ImageRegionConstIterator< TImage >::ImageRegionConstIterator(), and itk::ImageRegionConstIterator< TImage >::SetIndex().


The documentation for this class was generated from the following file:
Generated at Wed Mar 12 01:17:20 2003 for ITK by doxygen 1.2.15 written by Dimitri van Heesch, © 1997-2000