#include <itkImageRegionConstIterator.h>

Inheritance diagram for itk::ImageRegionConstIterator< TImage >:

Collaboration diagram for itk::ImageRegionConstIterator< TImage >:

Detailed Description

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

A multi-dimensional iterator templated over image type that walks a region of pixels.

The itk::ImageRegionConstIterator is optimized for iteration speed and is the first choice for iterative, pixel-wise operations on an image. ImageRegionIterator is the least specialized of the ITK image iterator classes. ImageRegionConstIterator is templated over the image type, and is constrained to walk only within the specified region and along a line parallel to one of the coordinate axes, "wrapping" to the next line as it reaches the boundary of the image. To walk the entire image, specify the region to be image->GetRequestedRegion().

ImageRegionConstIterator provides read-only access to image data. It is the base class for the read/write access ImageRegionIterator.

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;
   }

MORE INFORMATION: For a complete description of the ITK Image Iterators and their API, please see the Iterators chapter in the ITK Software Guide. The ITK Software Guide is available in print and as a free .pdf download from https://www.itk.org.

See Also: ImageConstIterator; ConditionalConstIterator; ConstNeighborhoodIterator; ConstShapedNeighborhoodIterator; ConstSliceIterator; CorrespondenceDataStructureIterator; FloodFilledFunctionConditionalConstIterator; FloodFilledImageFunctionConditionalConstIterator; FloodFilledImageFunctionConditionalIterator; FloodFilledSpatialFunctionConditionalConstIterator; FloodFilledSpatialFunctionConditionalIterator; ImageConstIterator; ImageConstIteratorWithIndex; ImageIterator; ImageIteratorWithIndex; ImageLinearConstIteratorWithIndex; ImageLinearIteratorWithIndex; ImageRandomConstIteratorWithIndex; ImageRandomIteratorWithIndex; ImageRegionConstIterator; ImageRegionConstIteratorWithIndex; ImageRegionExclusionConstIteratorWithIndex; ImageRegionExclusionIteratorWithIndex; ImageRegionIterator; ImageRegionIteratorWithIndex; ImageRegionReverseConstIterator; ImageRegionReverseIterator; ImageReverseConstIterator; ImageReverseIterator; ImageSliceConstIteratorWithIndex; ImageSliceIteratorWithIndex; NeighborhoodIterator; PathConstIterator; PathIterator; ShapedNeighborhoodIterator; SliceIterator; ImageConstIteratorWithIndex

Wiki Examples:

ImageRegionConstIterator provides read-only access to image data. It is the base class for the read/write access ImageRegionIterator. Specialized for RLEImage.

Examples:: Examples/RegistrationITKv3/DeformableRegistration2.cxx, Examples/RegistrationITKv3/DeformableRegistration5.cxx, Examples/RegistrationITKv4/DeformableRegistration2.cxx, Examples/RegistrationITKv4/DeformableRegistration5.cxx, Examples/Statistics/BayesianClassifierInitializer.cxx, SphinxExamples/src/Core/Common/UseParallelizeImageRegion/Code.cxx, and WikiExamples/Developer/MultiThreadedImageFilter.cxx.

Definition at line 107 of file itkImageRegionConstIterator.h.

Public Types
using	AccessorType = typename Superclass::AccessorType

using	ImageType = typename Superclass::ImageType

using	IndexType = typename Superclass::IndexType

using	InternalPixelType = typename Superclass::InternalPixelType

using	OffsetType = typename Superclass::OffsetType

using	PixelContainer = typename Superclass::PixelContainer

using	PixelContainerPointer = typename Superclass::PixelContainerPointer

using	PixelType = typename Superclass::PixelType

using	RegionType = typename Superclass::RegionType

using	Self = ImageRegionConstIterator

using	SizeType = typename Superclass::SizeType

using	Superclass = ImageConstIterator< TImage >

Public Types inherited from itk::ImageConstIterator< TImage >
using	AccessorFunctorType = typename TImage::AccessorFunctorType

using	AccessorType = typename TImage::AccessorType

using	ImageType = TImage

using	IndexType = typename TImage::IndexType

using	InternalPixelType = typename TImage::InternalPixelType

using	OffsetType = typename TImage::OffsetType

using	PixelContainer = typename TImage::PixelContainer

using	PixelContainerPointer = typename PixelContainer::Pointer

using	PixelType = typename TImage::PixelType

using	RegionType = typename TImage::RegionType

using	Self = ImageConstIterator

using	SizeType = typename TImage::SizeType

Public Member Functions
virtual const char *	GetNameOfClass () const

void	GoToBegin ()

void	GoToEnd ()

	ImageRegionConstIterator ()

	ImageRegionConstIterator (const ImageIterator< TImage > &it)

	ImageRegionConstIterator (const ImageConstIterator< TImage > &it)


	ImageRegionConstIterator (const ImageType *ptr, const RegionType &region)


void	SetIndex (const IndexType &ind) override


Self &	operator++ ()


Self &	operator-- ()

Public Member Functions inherited from itk::ImageConstIterator< TImage >
	ImageConstIterator (const Self &it)

	itkTypeMacroNoParent (ImageConstIterator)

virtual	~ImageConstIterator ()=default

	ImageConstIterator ()

	ImageConstIterator (const ImageType *ptr, const RegionType &region)

Self &	operator= (const Self &it)

virtual void	SetRegion (const RegionType &region)

bool	operator!= (const Self &it) const

bool	operator== (const Self &it) const

bool	operator<= (const Self &it) const

bool	operator< (const Self &it) const

bool	operator>= (const Self &it) const

bool	operator> (const Self &it) const

const IndexType	GetIndex () const

const RegionType &	GetRegion () const

const ImageType *	GetImage () const

PixelType	Get () const

const PixelType &	Value () const

void	GoToBegin ()

void	GoToEnd ()

bool	IsAtBegin () const

bool	IsAtEnd () const

Static Public Attributes
static constexpr unsigned int	ImageIteratorDimension = Superclass::ImageIteratorDimension

Static Public Attributes inherited from itk::ImageConstIterator< TImage >
static constexpr unsigned int	ImageIteratorDimension = TImage::ImageDimension

Protected Attributes
OffsetValueType	m_SpanBeginOffset

OffsetValueType	m_SpanEndOffset

Protected Attributes inherited from itk::ImageConstIterator< TImage >
TImage::ConstWeakPointer	m_Image

RegionType	m_Region

OffsetValueType	m_Offset

OffsetValueType	m_BeginOffset

OffsetValueType	m_EndOffset

const InternalPixelType *	m_Buffer

AccessorType	m_PixelAccessor

AccessorFunctorType	m_PixelAccessorFunctor

Private Member Functions
void	Decrement ()

void	Increment ()

Member Typedef Documentation

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::AccessorType = typename Superclass::AccessorType

Definition at line 135 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::ImageType = typename Superclass::ImageType

Definition at line 130 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::IndexType = typename Superclass::IndexType

Index type alias support While these were already typdef'ed in the superclass, they need to be redone here for this subclass to compile properly with gcc.Types inherited from the Superclass

Definition at line 126 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::InternalPixelType = typename Superclass::InternalPixelType

Definition at line 133 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::OffsetType = typename Superclass::OffsetType

Definition at line 128 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::PixelContainer = typename Superclass::PixelContainer

Definition at line 131 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::PixelContainerPointer = typename Superclass::PixelContainerPointer

Definition at line 132 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::PixelType = typename Superclass::PixelType

Definition at line 134 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::RegionType = typename Superclass::RegionType

Definition at line 129 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::Self = ImageRegionConstIterator

Standard class type alias.

Definition at line 111 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::SizeType = typename Superclass::SizeType

Definition at line 127 of file itkImageRegionConstIterator.h.

template<typename TImage>

using itk::ImageRegionConstIterator< TImage >::Superclass = ImageConstIterator< TImage >

Definition at line 112 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 141 of file itkImageRegionConstIterator.h.

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 149 of file itkImageRegionConstIterator.h.

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 164 of file itkImageRegionConstIterator.h.

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 181 of file itkImageRegionConstIterator.h.

Member Function Documentation

template<typename TImage>

void itk::ImageRegionConstIterator< TImage >::Decrement ( )

private

template<typename TImage>

virtual const char* itk::ImageRegionConstIterator< TImage >::GetNameOfClass ( ) const

virtual

Run-time type information (and related methods).

template<typename TImage>

void itk::ImageRegionConstIterator< TImage >::GoToBegin ( )

inline

Move an iterator to the beginning of the region. "Begin" is defined as the first pixel in the region.

Examples:: Examples/Segmentation/GibbsPriorImageFilter1.cxx.

Definition at line 194 of file itkImageRegionConstIterator.h.

Referenced by itk::Statistics::ImageToListSampleAdaptor< TImage >::Begin(), and itk::MultiphaseFiniteDifferenceImageFilter< TInputImage, TFeatureImage, TOutputImage, TFunction, unsigned int >::SetLevelSet().

template<typename TImage>

void itk::ImageRegionConstIterator< TImage >::GoToEnd ( )

inline

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

Definition at line 205 of file itkImageRegionConstIterator.h.

Referenced by itk::Statistics::ImageToListSampleAdaptor< TImage >::End().

template<typename TImage>

void itk::ImageRegionConstIterator< TImage >::Increment ( )

private

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 234 of file itkImageRegionConstIterator.h.

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 251 of file itkImageRegionConstIterator.h.

template<typename TImage>

void itk::ImageRegionConstIterator< TImage >::SetIndex ( const IndexType & ind )

inlineoverridevirtual

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 217 of file itkImageRegionConstIterator.h.

Member Data Documentation

template<typename TImage>

constexpr unsigned int itk::ImageRegionConstIterator< TImage >::ImageIteratorDimension = Superclass::ImageIteratorDimension

static

Dimension of the image that 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.

Definition at line 118 of file itkImageRegionConstIterator.h.

template<typename TImage>

OffsetValueType itk::ImageRegionConstIterator< TImage >::m_SpanBeginOffset

protected

Definition at line 262 of file itkImageRegionConstIterator.h.

template<typename TImage>

OffsetValueType itk::ImageRegionConstIterator< TImage >::m_SpanEndOffset

protected

Definition at line 264 of file itkImageRegionConstIterator.h.

The documentation for this class was generated from the following file: