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itk::FlatStructuringElement< VDimension > Class Template Reference
Group Filtering » Module ITKMathematicalMorphology

#include <itkKernelImageFilter.h>

Detailed Description

template<unsigned int VDimension>
class itk::FlatStructuringElement< VDimension >

A class to support a variety of flat structuring elements, including versions created by decomposition of lines.

FlatStructuringElement provides several static methods, which can be used to create a structuring element with a particular shape, size, etc. Currently, those methods enable the creation of the following structuring elements: ball, box, cross, annulus, or polygon. Polygons are available as fast approximations of balls using line decompositions. Boxes also use line decompositions.

"Flat" refers to binary as opposed to grayscale structuring elements. Flat structuring elements can be used for both binary and grayscale images.

A Neighborhood has an N-dimensional radius. The radius is defined separately for each dimension as the number of pixels that the neighborhood extends outward from the center pixel. For example, a 2D Neighborhood object with a radius of 2x3 has sides of length 5x7. However, in the case of balls and annuli, this definition is slightly different from the parametric definition of those objects. For example, an ellipse of radius 2x3 has a diameter of 4x6, not 5x7. To have a diameter of 5x7, the radius would need to increase by 0.5 in each dimension. Thus, the "radius" of the neighborhood and the "radius" of the object should be distinguished.

To accomplish this, the "ball" and "annulus" structuring elements have an optional flag called "radiusIsParametric" (off by default). Setting this flag to true will use the parametric definition of the object and will generate structuring elements with more accurate areas, which can be especially important when morphological operations are intended to remove or retain objects of particular sizes. When the mode is turned off (default), the radius is the same, but the object diameter is set to (radius*2)+1, which is the size of the neighborhood region. Thus, the original ball and annulus structuring elements have a systematic bias in the radius of +0.5 voxels in each dimension relative to the parametric definition of the radius. Thus, we recommend turning this mode on for more accurate structuring elements, but this mode is turned off by default for backward compatibility.

As an example, a 3D ball of radius 5 should have an area of 523. With this mode turned on, the number of "on" pixels is 515 (error 1.6%), but with it turned off, the area is 739 (error 41%). For a 3D annulus of radius 5 and thickness 2, the area should be 410. With this mode turned on, the area is 392 (error 4.5%), but when turned off it is 560 (error 36%). This same trend holds for balls and annuli of any radius or dimension. For more detailed experiments with this mode, please refer to the results of the test itkFlatStructuringElementTest.cxx or the wiki example.

ITK Sphinx Examples:
ITK Sphinx Examples:
Examples
SphinxExamples/src/Filtering/BinaryMathematicalMorphology/DilateABinaryImage/Code.cxx, SphinxExamples/src/Filtering/BinaryMathematicalMorphology/ErodeABinaryImage/Code.cxx, SphinxExamples/src/Filtering/LabelMap/ApplyMorphologicalClosingOnAllLabelObjects/Code.cxx, SphinxExamples/src/Filtering/LabelMap/ApplyMorphologicalClosingOnSpecificLabelObject/Code.cxx, SphinxExamples/src/Filtering/MathematicalMorphology/DilateAGrayscaleImage/Code.cxx, SphinxExamples/src/Filtering/MathematicalMorphology/ErodeAGrayscaleImage/Code.cxx, SphinxExamples/src/Filtering/MathematicalMorphology/ErodeBinaryImageUsingFlatStruct/Code.cxx, and SphinxExamples/src/Filtering/MathematicalMorphology/GenerateStructureElementsWithAccurateArea/Code.cxx.

Definition at line 27 of file itkKernelImageFilter.h.

+ Inheritance diagram for itk::FlatStructuringElement< VDimension >:
+ Collaboration diagram for itk::FlatStructuringElement< VDimension >:

Classes

struct  StructuringElementFacet
 

Public Types

using DecompType = std::vector< LType >
 
using ImageType = typename itk::Image< PixelType, VDimension >
 
using LType = Vector< float, VDimension >
 
using Self = FlatStructuringElement< VDimension >
 
using Superclass = Neighborhood< bool, VDimension >
 
- Public Types inherited from itk::Neighborhood< bool, VDimension >
using AllocatorType = NeighborhoodAllocator< bool >
 
using ConstIterator = typename AllocatorType::const_iterator
 
using DimensionValueType = unsigned int
 
using Iterator = typename AllocatorType::iterator
 
using NeighborIndexType = SizeValueType
 
using OffsetType = Offset< VDimension >
 
using PixelType = bool
 
using RadiusType = itk::Size< VDimension >
 
using Self = Neighborhood
 
using SizeType = itk::Size< VDimension >
 
using SizeValueType = typename SizeType::SizeValueType
 
using SliceIteratorType = SliceIterator< bool, Self >
 

Public Member Functions

bool CheckParallel (LType NewVec) const
 
void ComputeBufferFromLines ()
 
 FlatStructuringElement ()
 
 ~FlatStructuringElement () override=default
 
bool GetDecomposable () const
 
void SetDecomposable (bool v)
 
const DecompType & GetLines () const
 
void AddLine (LType l)
 
bool GetRadiusIsParametric () const
 
void SetRadiusIsParametric (bool flag)
 
virtual void RadiusIsParametricOn ()
 
- Public Member Functions inherited from itk::Neighborhood< bool, VDimension >
NeighborIndexType GetCenterNeighborhoodIndex () const
 
bool GetCenterValue () const
 
virtual const char * GetNameOfClass () const
 
virtual NeighborIndexType GetNeighborhoodIndex (const OffsetType &) const
 
OffsetType GetOffset (NeighborIndexType i) const
 
const SizeType GetRadius () const
 
SizeValueType GetRadius (DimensionValueType n) const
 
SizeType GetSize () const
 
SizeValueType GetSize (DimensionValueType n) const
 
std::slice GetSlice (unsigned int) const
 
OffsetValueType GetStride (DimensionValueType axis) const
 
 ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION (Self)
 
 Neighborhood ()=default
 
 Neighborhood (const Self &)=default
 
 Neighborhood (Self &&)=default
 
Self & operator= (const Self &)=default
 
Self & operator= (Self &&)=default
 
bool operator== (const Self &other) const
 
void Print (std::ostream &os) const
 
void SetRadius (const SizeType &)
 
void SetRadius (const SizeValueType)
 
NeighborIndexType Size () const
 
virtual ~Neighborhood ()=default
 
Iterator End ()
 
ConstIterator End () const
 
Iterator Begin ()
 
ConstIterator Begin () const
 
bool & operator[] (NeighborIndexType i)
 
const bool & operator[] (NeighborIndexType i) const
 
bool & GetElement (NeighborIndexType i)
 
bool & operator[] (const OffsetType &o)
 
const bool & operator[] (const OffsetType &o) const
 
void SetRadius (const SizeValueType *rad)
 
AllocatorType & GetBufferReference ()
 
const AllocatorType & GetBufferReference () const
 

Static Public Member Functions

static Self Annulus (RadiusType radius, unsigned int thickness=1, bool includeCenter=false, bool radiusIsParametric=false)
 
static Self Ball (RadiusType radius, bool radiusIsParametric=false)
 
static Self Box (RadiusType radius)
 
static Self Cross (RadiusType radius)
 
static Self FromImage (const ImageType *image)
 
static Self Polygon (RadiusType radius, unsigned int lines)
 

Static Public Attributes

static constexpr unsigned int NeighborhoodDimension = VDimension
 
- Static Public Attributes inherited from itk::Neighborhood< bool, VDimension >
static constexpr unsigned int NeighborhoodDimension
 

Protected Member Functions

void PrintSelf (std::ostream &os, Indent indent) const override
 
- Protected Member Functions inherited from itk::Neighborhood< bool, VDimension >
virtual void Allocate (NeighborIndexType i)
 
virtual void ComputeNeighborhoodOffsetTable ()
 
virtual void ComputeNeighborhoodStrideTable ()
 
void SetSize ()
 

Private Types

using FacetType = StructuringElementFacet< VDimension >
 
using FacetType3 = StructuringElementFacet< 3 >
 
using LType2 = Vector< float, 2 >
 
using LType3 = Vector< float, 3 >
 

Static Private Member Functions

static RadiusType CheckImageSize (const ImageType *image)
 
static void GeneratePolygon (itk::FlatStructuringElement< 2 > &res, itk::Size< 2 > radius, unsigned int lines)
 
static void GeneratePolygon (itk::FlatStructuringElement< 3 > &res, itk::Size< 3 > radius, unsigned int lines)
 
template<typename TStructuringElement , typename TRadius >
static void GeneratePolygon (TStructuringElement &res, TRadius radius, unsigned int lines)
 

Private Attributes

bool m_Decomposable {}
 
DecompType m_Lines {}
 
bool m_RadiusIsParametric {}
 

Member Typedef Documentation

◆ DecompType

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::DecompType = std::vector<LType>

Definition at line 118 of file itkFlatStructuringElement.h.

◆ FacetType

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::FacetType = StructuringElementFacet<VDimension>
private

Definition at line 239 of file itkFlatStructuringElement.h.

◆ FacetType3

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::FacetType3 = StructuringElementFacet<3>
private

Definition at line 250 of file itkFlatStructuringElement.h.

◆ ImageType

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::ImageType = typename itk::Image<PixelType, VDimension>

ImageType used in constructors

Definition at line 121 of file itkFlatStructuringElement.h.

◆ LType

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::LType = Vector<float, VDimension>

Definition at line 117 of file itkFlatStructuringElement.h.

◆ LType2

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::LType2 = Vector<float, 2>
private

Definition at line 247 of file itkFlatStructuringElement.h.

◆ LType3

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::LType3 = Vector<float, 3>
private

Definition at line 249 of file itkFlatStructuringElement.h.

◆ Self

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::Self = FlatStructuringElement<VDimension>

Standard class type aliases.

Definition at line 92 of file itkFlatStructuringElement.h.

◆ Superclass

template<unsigned int VDimension>
using itk::FlatStructuringElement< VDimension >::Superclass = Neighborhood<bool, VDimension>

Definition at line 93 of file itkFlatStructuringElement.h.

Constructor & Destructor Documentation

◆ ~FlatStructuringElement()

template<unsigned int VDimension>
itk::FlatStructuringElement< VDimension >::~FlatStructuringElement ( )
overridedefault

Default destructor.

◆ FlatStructuringElement()

template<unsigned int VDimension>
itk::FlatStructuringElement< VDimension >::FlatStructuringElement ( )
inline

Default constructor.

Definition at line 127 of file itkFlatStructuringElement.h.

Member Function Documentation

◆ AddLine()

template<unsigned int VDimension>
void itk::FlatStructuringElement< VDimension >::AddLine ( LType  l)
inline

Return the lines associated with the structuring element

Definition at line 186 of file itkFlatStructuringElement.h.

◆ Annulus()

template<unsigned int VDimension>
static Self itk::FlatStructuringElement< VDimension >::Annulus ( RadiusType  radius,
unsigned int  thickness = 1,
bool  includeCenter = false,
bool  radiusIsParametric = false 
)
static

Create an annulus structuring element

◆ Ball()

template<unsigned int VDimension>
static Self itk::FlatStructuringElement< VDimension >::Ball ( RadiusType  radius,
bool  radiusIsParametric = false 
)
static

Create a ball structuring element

◆ Box()

template<unsigned int VDimension>
static Self itk::FlatStructuringElement< VDimension >::Box ( RadiusType  radius)
static

Various constructors Create a box structuring element. The structuring element is is decomposable.

◆ CheckImageSize()

template<unsigned int VDimension>
static RadiusType itk::FlatStructuringElement< VDimension >::CheckImageSize ( const ImageType *  image)
staticprivate

Check for correct odd size image. Return image size. Called in constructor FromImage.

◆ CheckParallel()

template<unsigned int VDimension>
bool itk::FlatStructuringElement< VDimension >::CheckParallel ( LType  NewVec) const

◆ ComputeBufferFromLines()

template<unsigned int VDimension>
void itk::FlatStructuringElement< VDimension >::ComputeBufferFromLines ( )

Fill the buffer of the structuring element based on the lines associated to the structuring element

◆ Cross()

template<unsigned int VDimension>
static Self itk::FlatStructuringElement< VDimension >::Cross ( RadiusType  radius)
static

Create a cross structuring element

◆ FromImage()

template<unsigned int VDimension>
static Self itk::FlatStructuringElement< VDimension >::FromImage ( const ImageType *  image)
static

Create a FlatStructureElement from a bool image. Image must be odd in all dimensions.

◆ GeneratePolygon() [1/3]

template<unsigned int VDimension>
static void itk::FlatStructuringElement< VDimension >::GeneratePolygon ( itk::FlatStructuringElement< 2 > &  res,
itk::Size< 2 >  radius,
unsigned int  lines 
)
staticprivate

◆ GeneratePolygon() [2/3]

template<unsigned int VDimension>
static void itk::FlatStructuringElement< VDimension >::GeneratePolygon ( itk::FlatStructuringElement< 3 > &  res,
itk::Size< 3 >  radius,
unsigned int  lines 
)
staticprivate

◆ GeneratePolygon() [3/3]

template<unsigned int VDimension>
template<typename TStructuringElement , typename TRadius >
static void itk::FlatStructuringElement< VDimension >::GeneratePolygon ( TStructuringElement &  res,
TRadius  radius,
unsigned int  lines 
)
staticprivate

◆ GetDecomposable()

template<unsigned int VDimension>
bool itk::FlatStructuringElement< VDimension >::GetDecomposable ( ) const
inline

Returns whether the structuring element is decomposable or not. If the structuring is decomposable, the set of lines associated with the structuring may be used by an algorithm instead of the standard buffer.

Definition at line 168 of file itkFlatStructuringElement.h.

Referenced by itk::KernelImageFilter< TImage, TImage, TKernel >::MakeKernel().

◆ GetLines()

template<unsigned int VDimension>
const DecompType& itk::FlatStructuringElement< VDimension >::GetLines ( ) const
inline

Return the lines associated with the structuring element

Definition at line 181 of file itkFlatStructuringElement.h.

◆ GetRadiusIsParametric()

template<unsigned int VDimension>
bool itk::FlatStructuringElement< VDimension >::GetRadiusIsParametric ( ) const
inline

The RadiusIsParametric mode ensures that the area of the foreground corresponds to the radius that was specified. This defaults to "off" for backward compatibility.

Definition at line 208 of file itkFlatStructuringElement.h.

◆ Polygon()

template<unsigned int VDimension>
static Self itk::FlatStructuringElement< VDimension >::Polygon ( RadiusType  radius,
unsigned int  lines 
)
static

Create a polygon structuring element. The structuring element is is decomposable. lines is the number of elements in the decomposition

◆ PrintSelf()

template<unsigned int VDimension>
void itk::FlatStructuringElement< VDimension >::PrintSelf ( std::ostream &  ,
Indent   
) const
overrideprotectedvirtual

Standard itk object method.

Reimplemented from itk::Neighborhood< bool, VDimension >.

◆ RadiusIsParametricOn()

template<unsigned int VDimension>
virtual void itk::FlatStructuringElement< VDimension >::RadiusIsParametricOn ( )
virtual

The RadiusIsParametric mode ensures that the area of the foreground corresponds to the radius that was specified. This defaults to "off" for backward compatibility.

◆ SetDecomposable()

template<unsigned int VDimension>
void itk::FlatStructuringElement< VDimension >::SetDecomposable ( bool  v)
inline

Returns whether the structuring element is decomposable or not. If the structuring is decomposable, the set of lines associated with the structuring may be used by an algorithm instead of the standard buffer.

Definition at line 173 of file itkFlatStructuringElement.h.

◆ SetRadiusIsParametric()

template<unsigned int VDimension>
void itk::FlatStructuringElement< VDimension >::SetRadiusIsParametric ( bool  flag)
inline

The RadiusIsParametric mode ensures that the area of the foreground corresponds to the radius that was specified. This defaults to "off" for backward compatibility.

Definition at line 213 of file itkFlatStructuringElement.h.

Member Data Documentation

◆ m_Decomposable

template<unsigned int VDimension>
bool itk::FlatStructuringElement< VDimension >::m_Decomposable {}
private

Definition at line 230 of file itkFlatStructuringElement.h.

◆ m_Lines

template<unsigned int VDimension>
DecompType itk::FlatStructuringElement< VDimension >::m_Lines {}
private

Definition at line 232 of file itkFlatStructuringElement.h.

◆ m_RadiusIsParametric

template<unsigned int VDimension>
bool itk::FlatStructuringElement< VDimension >::m_RadiusIsParametric {}
private

Definition at line 252 of file itkFlatStructuringElement.h.

◆ NeighborhoodDimension

template<unsigned int VDimension>
constexpr unsigned int itk::FlatStructuringElement< VDimension >::NeighborhoodDimension = VDimension
staticconstexpr

External support for dimensionality.

Definition at line 115 of file itkFlatStructuringElement.h.

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