itk::MultivariateLegendrePolynomial Class Reference

#include <itkMultivariateLegendrePolynomial.h>

Detailed Description

2D and 3D multivariate Legendre Polynomial

In 2D,

$f(x_{vector}, parameter_{vector}) = \sum_i^l \left( \sum_j^{l-i} \left( parameter_ {ij} * P_i(x) *P_j(y)) \right) \right)$

where P_i() denoting a Legendre polynomial of degree i and l it the degree of the polynomial

In 3D,

$f(x_{vector}, parameter_{vector}) = \sum_i^l \left( \sum_j^{l-i} \left( \sum_k^{l-i-j} \left( parameter_{ijk} * P_i(x) * P_j(y) * P_k(z) \right) \right) \right)$

The size of the parameter vector for 2D is $\frac{(l+1)\cdot(1+2)}{2}$ , and for 3D is $\frac{(l+1)*(l+2)*(l+3){3!}$

To get the size of the parameter vector, users can use one of the two GetNumberOfCoefficients() member functions

To get function result, users can use the operator() or its SimpleForwardIterator's Get() method.

This is a part of the bias correction methods and implemenations that was initially developed and implemented by Martin Styner, Univ. of North Carolina at Chapel Hill, and his colleagues.

Note:: For more details. refer to the following articles. "Parametric estimate of intensity inhomogeneities applied to MRI" Martin Styner, G. Gerig, Christian Brechbuehler, Gabor Szekely, IEEE TRANSACTIONS ON MEDICAL IMAGING; 19(3), pp. 153-165, 2000, (http://www.ia.unc.edu/~styner/docs/tmi00.pdf)

"Evaluation of 2D/3D bias correction with 1+1ES-optimization" Martin Styner, Prof. Dr. G. Gerig (IKT, BIWI, ETH Zuerich), TR-197 (http://www.ia.unc.edu/~styner/docs/StynerTR97.pdf)

Definition at line 71 of file itkMultivariateLegendrePolynomial.h.


double	Evaluate (IndexType &index)
unsigned int	GetNumberOfCoefficients (unsigned int dimension, unsigned int degree)
unsigned int	GetNumberOfCoefficients ()
void	Print (std::ostream &os)
void	CalculateXCoef (double norm_y, const CoefficientArrayType &coef)
void	CalculateYCoef (double norm_z, const CoefficientArrayType &coef)
double	LegendreSum (const double x, int n, const CoefficientArrayType &coef, int offset=0)
void	PrintSelf (std::ostream &os, Indent indent) const
Public Types
typedef DoubleArrayType	CoefficientArrayType
typedef ULongArrayType	DomainSizeType
typedef std::vector< double >	DoubleArrayType
typedef LongArrayType	IndexType
typedef std::vector< long >	LongArrayType
typedef Array< double >	ParametersType
typedef MultivariateLegendrePolynomial	Self
typedef std::vector< unsigned long >	ULongArrayType
Public Member Functions
const CoefficientArrayType &	GetCoefficients (void) const
unsigned int	GetDegree (void) const
unsigned int	GetDimension (void) const
const DomainSizeType &	GetDomainSize (void) const
unsigned int	GetNumberOfCoefficients (void) const
	MultivariateLegendrePolynomial (unsigned int dimension, unsigned int degree, const DomainSizeType &domainSize)
void	SetCoefficients (const ParametersType &coef) throw (CoefficientVectorSizeMismatch)
void	SetCoefficients (const CoefficientArrayType &coef) throw (CoefficientVectorSizeMismatch)
virtual	~MultivariateLegendrePolynomial ()
Classes
class	CoefficientVectorSizeMismatch
class	SimpleForwardIterator
	Iterator which only supports forward iteration and Begin(), IsAtEnd(), and Get() method which work just like as SimpleImageRegionIterator. More...

Member Typedef Documentation

typedef DoubleArrayType itk::MultivariateLegendrePolynomial::CoefficientArrayType

Internal coefficient storage type.

Definition at line 81 of file itkMultivariateLegendrePolynomial.h.

typedef ULongArrayType itk::MultivariateLegendrePolynomial::DomainSizeType

The size of the domain.

Definition at line 88 of file itkMultivariateLegendrePolynomial.h.

typedef std::vector< double > itk::MultivariateLegendrePolynomial::DoubleArrayType

Definition at line 76 of file itkMultivariateLegendrePolynomial.h.

typedef LongArrayType itk::MultivariateLegendrePolynomial::IndexType

Definition at line 89 of file itkMultivariateLegendrePolynomial.h.

typedef std::vector< long > itk::MultivariateLegendrePolynomial::LongArrayType

Definition at line 78 of file itkMultivariateLegendrePolynomial.h.

typedef Array< double > itk::MultivariateLegendrePolynomial::ParametersType

Same as CoefficientArray This type definition will be used by EnergyFunction object.

Definition at line 85 of file itkMultivariateLegendrePolynomial.h.

typedef MultivariateLegendrePolynomial itk::MultivariateLegendrePolynomial::Self

Definition at line 74 of file itkMultivariateLegendrePolynomial.h.

typedef std::vector< unsigned long > itk::MultivariateLegendrePolynomial::ULongArrayType

Definition at line 77 of file itkMultivariateLegendrePolynomial.h.

Constructor & Destructor Documentation

itk::MultivariateLegendrePolynomial::MultivariateLegendrePolynomial	(	unsigned int	dimension,
		unsigned int	degree,
		const DomainSizeType &	domainSize
	)

Constructor.

virtual itk::MultivariateLegendrePolynomial::~MultivariateLegendrePolynomial ( ) [virtual]

Destructor.

Member Function Documentation

void itk::MultivariateLegendrePolynomial::CalculateXCoef	(	double	norm_y,
		const CoefficientArrayType &	coef
	)			`[protected]`

In the case which the bias field is 2D, it returns bias value at the point which is specified by the index

Referenced by Evaluate().

void itk::MultivariateLegendrePolynomial::CalculateYCoef	(	double	norm_z,
		const CoefficientArrayType &	coef
	)			`[protected]`

In the case which the bias field is 2D, it returns bias value at the point which is specified by the index

Referenced by Evaluate().

double itk::MultivariateLegendrePolynomial::Evaluate ( IndexType & index ) [inline]

In the case which the bias field is 2D, it returns bias value at the point which is specified by the index

Definition at line 149 of file itkMultivariateLegendrePolynomial.h.

References CalculateXCoef(), CalculateYCoef(), and LegendreSum().

Referenced by itk::MultivariateLegendrePolynomial::SimpleForwardIterator::Get().

const CoefficientArrayType& itk::MultivariateLegendrePolynomial::GetCoefficients ( void ) const

Gets Legendre polynomials' coefficients.

unsigned int itk::MultivariateLegendrePolynomial::GetDegree ( void ) const [inline]

Gets the degree (the degree of Legendre polynomials).

Definition at line 104 of file itkMultivariateLegendrePolynomial.h.

unsigned int itk::MultivariateLegendrePolynomial::GetDimension ( void ) const [inline]

Gets the dimension.

Definition at line 100 of file itkMultivariateLegendrePolynomial.h.

Referenced by itk::MultivariateLegendrePolynomial::SimpleForwardIterator::SimpleForwardIterator().

const DomainSizeType& itk::MultivariateLegendrePolynomial::GetDomainSize ( void ) const [inline]

Gets each dimesion's size.

Definition at line 117 of file itkMultivariateLegendrePolynomial.h.

Referenced by itk::MultivariateLegendrePolynomial::SimpleForwardIterator::SimpleForwardIterator().

unsigned int itk::MultivariateLegendrePolynomial::GetNumberOfCoefficients	(	unsigned int	dimension,
		unsigned int	degree
	)

Gets the number of coefficients.

unsigned int itk::MultivariateLegendrePolynomial::GetNumberOfCoefficients ( )

Gets the number of coefficients.

unsigned int itk::MultivariateLegendrePolynomial::GetNumberOfCoefficients ( void ) const [inline]

Returns the number of coefficients of the polynomial This number is computed from the degree of the polynomial the SetCoefficients() method expects an array of this size, an exception is thrown otherwise

See also:: SetCoefficients

Definition at line 113 of file itkMultivariateLegendrePolynomial.h.

double itk::MultivariateLegendrePolynomial::LegendreSum	(	const double	x,
		int	n,
		const CoefficientArrayType &	coef,
		int	offset = `0`
	)			`[protected]`

In the case which the bias field is 2D, it returns bias value at the point which is specified by the index

Referenced by Evaluate().

void itk::MultivariateLegendrePolynomial::Print ( std::ostream & os )

In the case which the bias field is 2D, it returns bias value at the point which is specified by the index

void itk::MultivariateLegendrePolynomial::PrintSelf	(	std::ostream &	os,
		Indent	indent
	)			const `[protected]`

In the case which the bias field is 2D, it returns bias value at the point which is specified by the index

void itk::MultivariateLegendrePolynomial::SetCoefficients ( const ParametersType & coef ) throw (CoefficientVectorSizeMismatch)

void itk::MultivariateLegendrePolynomial::SetCoefficients ( const CoefficientArrayType & coef ) throw (CoefficientVectorSizeMismatch)

Sets the Legendre polynomials' parameters.

Warning:: The number of coefficients provided should match the number returned by GetNumberOfCoefficients() otherwise an exception is thrown.

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

itkMultivariateLegendrePolynomial.h

itk::MultivariateLegendrePolynomial Class Reference

Detailed Description

Public Types

Public Member Functions

Classes

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation