#include <itkImageRandomConstIteratorWithOnlyIndex.h>

Detailed Description

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

A multi-dimensional image iterator that visits a random set of locations within an image region, providing index information.

ImageRandomConstIteratorWithOnlyIndex is a multi-dimensional iterator class that is templated over image type. ImageRandomConstIteratorWithOnlyIndex is constrained to walk only within the specified region. It samples random region positions at each increment or decrement.

No access to image data is possible, and thus the class can be used with images of type ImageBase.

ImageRandomConstIteratorWithOnlyIndex 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.

The operator++ method provides a simple syntax for walking around a region of a multidimensional image. operator++ performs a jump to a random position within the specified image region. This is designed to facilitate the extraction of random indices from the image.

This is the typical use of this iterator in a loop:

ImageRandomConstIteratorWithOnlyIndex<ImageType> it( image, image->GetRequestedRegion() );
 
it.SetNumberOfSamples(200);
it.GoToBegin();
while( !it.IsAtEnd() )
{
  std::cout << it.GetIndex() << std::endl;
  ++it;  // here it jumps to another random position inside the region
 }

or

ImageRandomConstIteratorWithOnlyIndex<ImageType> it( image, image->GetRequestedRegion() );
 
it.SetNumberOfSamples(200);
it.GoToEnd();
while( !it.IsAtBegin() )
{
  std::cout << it.GetIndex() << std::endl;
  --it;  // here it jumps to another random position inside the region
 }

Warning: Incrementing the iterator (++it) followed by a decrement (–it) or vice versa does not in general return the iterator to the same position.

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.

Index-only iterators:

See also: ImageConstIteratorWithOnlyIndex; ConstNeighborhoodIteratorWithOnlyIndex

Pixel data-access iterators:

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

Definition at line 124 of file itkImageRandomConstIteratorWithOnlyIndex.h.

Inheritance diagram for itk::ImageRandomConstIteratorWithOnlyIndex< TImage >:

Collaboration diagram for itk::ImageRandomConstIteratorWithOnlyIndex< TImage >:

Public Types
using	ImageType

using	IndexType

using	IndexValueType

using	OffsetType

using	OffsetValueType

using	RegionType

using	Self = ImageRandomConstIteratorWithOnlyIndex

using	SizeType

using	SizeValueType

using	Superclass = ImageConstIteratorWithOnlyIndex<TImage>

Public Types inherited from itk::ImageConstIteratorWithOnlyIndex< TImage >
using	ImageType = TImage

using	IndexType = typename TImage::IndexType

using	IndexValueType = typename IndexType::IndexValueType

using	OffsetType = typename TImage::OffsetType

using	OffsetValueType = typename OffsetType::OffsetValueType

using	RegionType = typename TImage::RegionType

using	Self = ImageConstIteratorWithOnlyIndex

using	SizeType = typename TImage::SizeType

using	SizeValueType = typename SizeType::SizeValueType

Public Member Functions
SizeValueType	GetNumberOfSamples () const

void	GoToBegin ()

void	GoToEnd ()

	ImageRandomConstIteratorWithOnlyIndex ()=default

	ImageRandomConstIteratorWithOnlyIndex (const ImageConstIteratorWithOnlyIndex< TImage > &it)

	ImageRandomConstIteratorWithOnlyIndex (const TImage *ptr, const RegionType &region)

bool	IsAtBegin () const

bool	IsAtEnd () const

Self &	operator++ ()

Self &	operator-- ()

void	ReinitializeSeed ()

void	ReinitializeSeed (int)

void	SetNumberOfSamples (SizeValueType number)

	~ImageRandomConstIteratorWithOnlyIndex () override=default

Public Member Functions inherited from itk::ImageConstIteratorWithOnlyIndex< TImage >
const IndexType &	GetIndex () const

const RegionType &	GetRegion () const

void	GoToBegin ()

void	GoToReverseBegin ()

	ImageConstIteratorWithOnlyIndex ()=default

	ImageConstIteratorWithOnlyIndex (const TImage *ptr, const RegionType &region)

bool	IsAtEnd () const

bool	IsAtReverseEnd () const

	ITK_DEFAULT_COPY_AND_MOVE (ImageConstIteratorWithOnlyIndex)

	ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION (Self)

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	Remaining ()

void	SetIndex (const IndexType &ind)

virtual	~ImageConstIteratorWithOnlyIndex ()=default

Private Types
using	GeneratorPointer = Statistics::MersenneTwisterRandomVariateGenerator::Pointer

Private Member Functions
void	RandomJump ()

Private Attributes
GeneratorPointer	m_Generator { Statistics::MersenneTwisterRandomVariateGenerator::New() }

SizeValueType	m_NumberOfPixelsInRegion {}

SizeValueType	m_NumberOfSamplesDone {}

SizeValueType	m_NumberOfSamplesRequested {}

Additional Inherited Members
Static Public Member Functions inherited from itk::ImageConstIteratorWithOnlyIndex< TImage >
static constexpr unsigned int	GetImageDimension ()

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

Protected Attributes inherited from itk::ImageConstIteratorWithOnlyIndex< TImage >
IndexType	m_BeginIndex { { 0 } }

IndexType	m_EndIndex { { 0 } }

IndexType	m_PositionIndex { { 0 } }

RegionType	m_Region {}

bool	m_Remaining { false }

Member Typedef Documentation

◆ GeneratorPointer

template<typename TImage>

using itk::ImageRandomConstIteratorWithOnlyIndex< TImage >::GeneratorPointer = Statistics::MersenneTwisterRandomVariateGenerator::Pointer

private

Definition at line 236 of file itkImageRandomConstIteratorWithOnlyIndex.h.

◆ ImageType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::ImageType

Image type alias support

Definition at line 122 of file itkImageConstIteratorWithOnlyIndex.h.

◆ IndexType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::IndexType

Index type alias support

Definition at line 111 of file itkImageConstIteratorWithOnlyIndex.h.

◆ IndexValueType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::IndexValueType

Definition at line 112 of file itkImageConstIteratorWithOnlyIndex.h.

◆ OffsetType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::OffsetType

Type of the Offset taken from the image

Definition at line 125 of file itkImageConstIteratorWithOnlyIndex.h.

◆ OffsetValueType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::OffsetValueType

Definition at line 126 of file itkImageConstIteratorWithOnlyIndex.h.

◆ RegionType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::RegionType

Region type alias support

Definition at line 119 of file itkImageConstIteratorWithOnlyIndex.h.

◆ Self

template<typename TImage>

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

Standard class type aliases.

Definition at line 128 of file itkImageRandomConstIteratorWithOnlyIndex.h.

◆ SizeType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::SizeType

Size type alias support

Definition at line 115 of file itkImageConstIteratorWithOnlyIndex.h.

◆ SizeValueType

template<typename TImage>

using itk::ImageConstIteratorWithOnlyIndex< TImage >::SizeValueType

Definition at line 116 of file itkImageConstIteratorWithOnlyIndex.h.

◆ Superclass

template<typename TImage>

using itk::ImageRandomConstIteratorWithOnlyIndex< TImage >::Superclass = ImageConstIteratorWithOnlyIndex<TImage>

Definition at line 129 of file itkImageRandomConstIteratorWithOnlyIndex.h.

Constructor & Destructor Documentation

◆ ImageRandomConstIteratorWithOnlyIndex() [1/3]

template<typename TImage>

itk::ImageRandomConstIteratorWithOnlyIndex< TImage >::ImageRandomConstIteratorWithOnlyIndex ( )

default

Default constructor.

◆ ~ImageRandomConstIteratorWithOnlyIndex()

template<typename TImage>

itk::ImageRandomConstIteratorWithOnlyIndex< TImage >::~ImageRandomConstIteratorWithOnlyIndex ( )

overridedefault

◆ ImageRandomConstIteratorWithOnlyIndex() [2/3]

template<typename TImage>

itk::ImageRandomConstIteratorWithOnlyIndex< TImage >::ImageRandomConstIteratorWithOnlyIndex	(	const TImage *	ptr,
		const RegionType &	region )

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

◆ ImageRandomConstIteratorWithOnlyIndex() [3/3]

template<typename TImage>

itk::ImageRandomConstIteratorWithOnlyIndex< TImage >::ImageRandomConstIteratorWithOnlyIndex ( const ImageConstIteratorWithOnlyIndex< TImage > & it )

inline

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

Definition at line 156 of file itkImageRandomConstIteratorWithOnlyIndex.h.

References itk::ImageConstIteratorWithOnlyIndex< TImage >::ImageConstIteratorWithOnlyIndex().