#include <itkConnectedImageNeighborhoodShape.h>

Detailed Description

template<unsigned int VImageDimension>
class itk::ConnectedImageNeighborhoodShape< VImageDimension >

Connected image-neighborhood shape, based on the topological property of pixel connectivity. Eases creating a sequence of offsets to construct a ShapedImageNeighborhoodRange object. Can also be used to specify the shape of a ShapedNeighborhoodIterator, using its ActivateOffset member function.

This shape class supports generating offsets in colexicographic order. Which means that, for example, a sequence of generated offsets for a 2-dimensional shape will have offset {1, 0} before offset {0, 1}. This order was chosen because it is usually in agreement with the order of the corresponding neighbor pixels, as stored in the internal image buffer.

The following example generates the offsets for a 3-dimensional 18-connected neighborhood shape, including the center pixel, and asserts that the result is as expected:

size_t maximumCityblockDistance = 2;
bool includeCenterPixel = true;
ConnectedImageNeighborhoodShape<3> shape{ maximumCityblockDistance, includeCenterPixel };
std::vector<Offset<3>> offsets = GenerateImageNeighborhoodOffsets(shape);
assert(offsets.size() == 19);
assert(offsets == std::vector<Offset<3>>(
{
  {{0, -1, -1}}, {{-1, 0, -1}}, {{0, 0, -1}},
  {{1, 0, -1}}, {{0, 1, -1}}, {{-1, -1, 0}},
  {{0, -1, 0}}, {{1, -1, 0}}, {{-1, 0, 0}},
  {{0, 0, 0}},
  {{1, 0, 0}}, {{-1, 1, 0}}, {{0, 1, 0}},
  {{1, 1, 0}}, {{0, -1, 1}}, {{-1, 0, 1}},
  {{0, 0, 1}}, {{1, 0, 1}}, {{0, 1, 1}}
}));

The following code shows how to create 4-connected, 8-connected, 6-connected, 18-connected, and 26-connected neighborhood shapes:

// 2-dimensional:
ConnectedImageNeighborhoodShape<2> _4_connectedShape{ 1, includeCenterPixel };
ConnectedImageNeighborhoodShape<2> _8_connectedShape{ 2, includeCenterPixel };
// 3-dimensional:
ConnectedImageNeighborhoodShape<3> _6_connectedShape{ 1, includeCenterPixel };
ConnectedImageNeighborhoodShape<3> _18_connectedShape{ 2, includeCenterPixel };
ConnectedImageNeighborhoodShape<3> _26_connectedShape{ 3, includeCenterPixel };

Author: Niels Dekker, LKEB, Leiden University Medical Center

See also: ShapedImageNeighborhoodRange; ShapedNeighborhoodIterator

Definition at line 87 of file itkConnectedImageNeighborhoodShape.h.

Public Member Functions
constexpr vcl_size_t	GetNumberOfOffsets () const noexcept


constexpr	ConnectedImageNeighborhoodShape (const vcl_size_t maximumCityblockDistance, const bool includeCenterPixel) noexcept


void	FillOffsets (Offset< ImageDimension > *const offsets) const noexcept

Static Public Attributes
static constexpr unsigned int	ImageDimension = VImageDimension

Static Private Member Functions
static constexpr uintmax_t	CalculateBinomialCoefficient (const uintmax_t n, const uintmax_t k) noexcept

static constexpr vcl_size_t	CalculateNumberOfConnectedNeighbors (const vcl_size_t maximumCityblockDistance) noexcept

static constexpr vcl_size_t	CalculateNumberOfHypercubesOnBoundaryOfCube (const vcl_size_t m, const vcl_size_t n) noexcept

static constexpr uintmax_t	CalculatePowerOfTwo (const vcl_size_t n) noexcept

static constexpr uintmax_t	CalculateSum (const uintmax_t a, const uintmax_t b) noexcept

static constexpr vcl_size_t	CalculateSumOfNumberOfHypercubesOnBoundaryOfCube (const vcl_size_t i, const vcl_size_t m) noexcept


static constexpr vcl_size_t	CalculateNumberOfOffsets (const vcl_size_t maximumCityblockDistance, const bool includeCenterPixel) noexcept

Private Attributes
bool	m_IncludeCenterPixel

vcl_size_t	m_MaximumCityblockDistance

vcl_size_t	m_NumberOfOffsets

Constructor & Destructor Documentation

◆ ConnectedImageNeighborhoodShape()

template<unsigned int VImageDimension>

constexpr itk::ConnectedImageNeighborhoodShape< VImageDimension >::ConnectedImageNeighborhoodShape	(	const vcl_size_t	maximumCityblockDistance,
		const bool	includeCenterPixel
	)

inlineexplicitconstexprnoexcept

Constructs a connected image-neighborhood shape. Its offsets contain only the offset values -1, 0, and 1. The parameter 'maximumCityblockDistance' specifies the maximum city-block distance (Manhattan distance) between the center pixel and the connected neighbor pixel. This distance measure corresponds to the number of non-zero values of an offset. For example, in a 3-dimensional neighborhood, offset {1,0,0}, {0,1,0}, and {0,0,1} have distance = 1 to the center, while offset {1,1,1} has distance = 3. The parameter 'includeCenterPixel' specifies whether or not the center pixel (offset zero) should be included with the offsets for this shape.

Definition at line 104 of file itkConnectedImageNeighborhoodShape.h.

Member Function Documentation

◆ CalculateBinomialCoefficient()

template<unsigned int VImageDimension>

static constexpr uintmax_t itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateBinomialCoefficient	(	const uintmax_t	n,
		const uintmax_t	k
	)

inlinestaticconstexprprivatenoexcept

Definition at line 200 of file itkConnectedImageNeighborhoodShape.h.

References itk::Math::UnsignedProduct().

Referenced by itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateNumberOfHypercubesOnBoundaryOfCube().

◆ CalculateNumberOfConnectedNeighbors()

template<unsigned int VImageDimension>

static constexpr vcl_size_t itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateNumberOfConnectedNeighbors ( const vcl_size_t maximumCityblockDistance )

inlinestaticconstexprprivatenoexcept

Calculates the number of neighbors connected to the center pixel.

Definition at line 235 of file itkConnectedImageNeighborhoodShape.h.

References itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateSumOfNumberOfHypercubesOnBoundaryOfCube(), itk::ConnectedImageNeighborhoodShape< VImageDimension >::ImageDimension, and itk::Math::UnsignedPower().

Referenced by itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateNumberOfOffsets().

◆ CalculateNumberOfHypercubesOnBoundaryOfCube()

template<unsigned int VImageDimension>

static constexpr vcl_size_t itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateNumberOfHypercubesOnBoundaryOfCube	(	const vcl_size_t	m,
		const vcl_size_t	n
	)

inlinestaticconstexprprivatenoexcept

Definition at line 211 of file itkConnectedImageNeighborhoodShape.h.

References itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateBinomialCoefficient(), itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculatePowerOfTwo(), and itk::Math::UnsignedProduct().

Referenced by itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateSumOfNumberOfHypercubesOnBoundaryOfCube().

◆ CalculateNumberOfOffsets()

template<unsigned int VImageDimension>

static constexpr vcl_size_t itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateNumberOfOffsets	(	const vcl_size_t	maximumCityblockDistance,
		const bool	includeCenterPixel
	)

inlinestaticconstexprprivatenoexcept

Calculates the number of offsets needed for this shape.

Definition at line 248 of file itkConnectedImageNeighborhoodShape.h.

References itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateNumberOfConnectedNeighbors().

◆ CalculatePowerOfTwo()

template<unsigned int VImageDimension>

static constexpr uintmax_t itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculatePowerOfTwo ( const vcl_size_t n )

inlinestaticconstexprprivatenoexcept

Definition at line 188 of file itkConnectedImageNeighborhoodShape.h.

Referenced by itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateNumberOfHypercubesOnBoundaryOfCube().

◆ CalculateSum()

template<unsigned int VImageDimension>

static constexpr uintmax_t itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateSum	(	const uintmax_t	a,
		const uintmax_t	b
	)

inlinestaticconstexprprivatenoexcept

Definition at line 179 of file itkConnectedImageNeighborhoodShape.h.

Referenced by itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateSumOfNumberOfHypercubesOnBoundaryOfCube().

◆ CalculateSumOfNumberOfHypercubesOnBoundaryOfCube()

template<unsigned int VImageDimension>

static constexpr vcl_size_t itk::ConnectedImageNeighborhoodShape< VImageDimension >::CalculateSumOfNumberOfHypercubesOnBoundaryOfCube	(	const vcl_size_t	i,
		const vcl_size_t	m
	)