ITK
6.0.0
Insight Toolkit
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#include <itkImageRegionConstIterator.h>
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()
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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:
Definition at line 109 of file itkImageRegionConstIterator.h.
Public Types | |
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 = ImageRegionConstIterator |
using | SizeType = typename TImage::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 | |
const char * | GetNameOfClass () const override |
void | GoToBegin () |
void | GoToEnd () |
ImageRegionConstIterator (const ImageConstIterator< TImage > &it) | |
ImageRegionConstIterator (const ImageIterator< TImage > &it) | |
ImageRegionConstIterator () | |
ImageRegionConstIterator (const ImageType *ptr, const RegionType ®ion) | |
void | SetIndex (const IndexType &ind) override |
Self & | operator++ () |
Self & | operator-- () |
Public Member Functions inherited from itk::ImageConstIterator< TImage > | |
PixelType | Get () const |
const ImageType * | GetImage () const |
const IndexType | GetIndex () const |
virtual const char * | GetNameOfClass () const |
const RegionType & | GetRegion () const |
void | GoToBegin () |
void | GoToEnd () |
ImageConstIterator (const Self &it) | |
bool | IsAtBegin () const |
bool | IsAtEnd () const |
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 |
virtual void | SetIndex (const IndexType &ind) |
virtual void | SetRegion (const RegionType ®ion) |
const PixelType & | Value () const |
virtual | ~ImageConstIterator ()=default |
ImageConstIterator () | |
ImageConstIterator (const ImageType *ptr, const RegionType ®ion) | |
Self & | operator= (const Self &it) |
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 > | |
OffsetValueType | m_BeginOffset {} |
const InternalPixelType * | m_Buffer {} |
OffsetValueType | m_EndOffset {} |
TImage::ConstWeakPointer | m_Image {} |
OffsetValueType | m_Offset {} |
AccessorType | m_PixelAccessor {} |
AccessorFunctorType | m_PixelAccessorFunctor {} |
RegionType | m_Region {} |
Private Member Functions | |
void | Decrement () |
void | Increment () |
Additional Inherited Members | |
Static Public Member Functions inherited from itk::ImageConstIterator< TImage > | |
static unsigned int | GetImageIteratorDimension () |
using itk::ImageConstIterator< TImage >::AccessorType = typename TImage::AccessorType |
Accessor type that convert data between internal and external representations.
Definition at line 128 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::ImageType = TImage |
Image type alias support
Definition at line 112 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::IndexType = typename TImage::IndexType |
Index type alias support
Definition at line 100 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::InternalPixelType = typename TImage::InternalPixelType |
Internal Pixel Type
Definition at line 121 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::OffsetType = typename TImage::OffsetType |
Offset type alias support
Definition at line 106 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::PixelContainer = typename TImage::PixelContainer |
PixelContainer type alias support. Used to refer to the container for the pixel data. While this was already typedef'ed in the superclass it needs to be redone here for this subclass to compile properly with gcc.
Definition at line 117 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::PixelContainerPointer = typename PixelContainer::Pointer |
Definition at line 118 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::PixelType = typename TImage::PixelType |
External Pixel Type
Definition at line 124 of file itkImageConstIterator.h.
using itk::ImageConstIterator< TImage >::RegionType = typename TImage::RegionType |
Region type alias support
Definition at line 109 of file itkImageConstIterator.h.
using itk::ImageRegionConstIterator< TImage >::Self = ImageRegionConstIterator |
Standard class type alias.
Definition at line 113 of file itkImageRegionConstIterator.h.
using itk::ImageConstIterator< TImage >::SizeType = typename TImage::SizeType |
Size type alias support
Definition at line 103 of file itkImageConstIterator.h.
using itk::ImageRegionConstIterator< TImage >::Superclass = ImageConstIterator<TImage> |
Definition at line 114 of file itkImageRegionConstIterator.h.
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Default constructor. Needed since we provide a cast constructor.
Definition at line 143 of file itkImageRegionConstIterator.h.
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Constructor establishes an iterator to walk a particular image and a particular region of that image. Initializes the iterator at the begin of the region.
Definition at line 153 of file itkImageRegionConstIterator.h.
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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 167 of file itkImageRegionConstIterator.h.
References itk::ImageConstIterator< TImage >::operator=().
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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 183 of file itkImageRegionConstIterator.h.
References itk::ImageConstIterator< TImage >::operator=().
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private |
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overridevirtual |
Reimplemented from itk::ImageConstIterator< TImage >.
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Move an iterator to the beginning of the region. "Begin" is defined as the first pixel in the region.
Definition at line 196 of file itkImageRegionConstIterator.h.
Referenced by itk::Statistics::ImageToListSampleAdaptor< TImage >::Begin(), and itk::MultiphaseFiniteDifferenceImageFilter< TInputImage, TFeatureImage, TOutputImage, TFiniteDifferenceFunction, TIdCell >::SetLevelSet().
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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 208 of file itkImageRegionConstIterator.h.
Referenced by itk::Statistics::ImageToListSampleAdaptor< TImage >::End().
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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.
Definition at line 238 of file itkImageRegionConstIterator.h.
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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.
Definition at line 256 of file itkImageRegionConstIterator.h.
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Set the index. No bounds checking is performed. This is overridden from the parent because we have an extra ivar.
Reimplemented from itk::ImageConstIterator< TImage >.
Definition at line 221 of file itkImageRegionConstIterator.h.
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staticconstexpr |
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 120 of file itkImageRegionConstIterator.h.
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Definition at line 267 of file itkImageRegionConstIterator.h.
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Definition at line 269 of file itkImageRegionConstIterator.h.