itk::ShortestPathCostFunctionTbss< TInputImageType > Class Template Reference

Cost function for Tract-Based Spatial Statistics (TBSS) path finding. More...

#include <itkShortestPathCostFunctionTbss.h>

Inheritance diagram for itk::ShortestPathCostFunctionTbss< TInputImageType >:

Collaboration diagram for itk::ShortestPathCostFunctionTbss< TInputImageType >:

Public Types
typedef ShortestPathCostFunctionTbss	Self
typedef ShortestPathCostFunction< TInputImageType >	Superclass
typedef SmartPointer< Self >	Pointer
typedef SmartPointer< const Self >	ConstPointer
typedef itk::ImageRegionConstIterator< TInputImageType >	ConstIteratorType
typedef TInputImageType::IndexType	IndexType
typedef itk::Image< float, 3 >	FloatImageType
Public Types inherited from itk::ShortestPathCostFunction< TInputImageType >
typedef ShortestPathCostFunction	Self
typedef Object	Superclass
typedef SmartPointer< Self >	Pointer
typedef SmartPointer< const Self >	ConstPointer
typedef ShapedNeighborhoodIterator< TInputImageType >	ShapedNeighborhoodIteratorType
typedef TInputImageType	ImageType
typedef TInputImageType::Pointer	ImagePointer
typedef TInputImageType::ConstPointer	ImageConstPointer
typedef TInputImageType::PixelType	PixelType
typedef TInputImageType::IndexType	IndexType

Public Member Functions
Pointer	Clone () const
virtual const char *	GetClassName () const
double	GetCost (IndexType p1, IndexType p2) override
	Calculate the cost of transitioning from pixel p1 to pixel p2. More...
void	Initialize () override
	Initialize the cost function. More...
double	GetMinCost () override
	Return the minimal possible cost (needed for A*). More...
void	SetThreshold (double t)
	Set the intensity threshold below which pixels are impassable. More...
Public Member Functions inherited from itk::ShortestPathCostFunction< TInputImageType >
virtual void	SetImage (const TInputImageType *_arg)
	Set the input image on which costs are computed. More...
void	SetStartIndex (const IndexType &index)
	Set the starting index of the path. More...
void	SetEndIndex (const IndexType &index)
	Set the ending index of the path. More...

Static Public Member Functions
static Pointer	New ()

Protected Member Functions
	ShortestPathCostFunctionTbss ()
	~ShortestPathCostFunctionTbss () override
Protected Member Functions inherited from itk::ShortestPathCostFunction< TInputImageType >
	ShortestPathCostFunction ()
	~ShortestPathCostFunction () override
void	PrintSelf (std::ostream &os, Indent indent) const override

Protected Attributes
double	m_Threshold
	Intensity threshold below which pixels are impassable. More...
Protected Attributes inherited from itk::ShortestPathCostFunction< TInputImageType >
ImageConstPointer	m_Image
	The input image used for cost computation. More...
IndexType	m_StartIndex
IndexType	m_EndIndex
	Start and end indices defining the path endpoints. More...

Detailed Description

template<class TInputImageType>
class itk::ShortestPathCostFunctionTbss< TInputImageType >

Cost function for Tract-Based Spatial Statistics (TBSS) path finding.

This cost function is designed for finding shortest paths along white matter tracts in TBSS analysis. The cost of transitioning between two pixels combines the Euclidean distance with a penalty inversely proportional to the pixel intensity (tract weight).

Pixels with intensity below the configured threshold are considered impassable (infinite cost), preventing the path from leaving the tract skeleton.

The cost formula is:

cost = sqrt(dx^2 + dy^2 + dz^2) + 1000 * (1 - weight)

where weight is the pixel intensity at the destination pixel.

Template Parameters

TInputImageType

The ITK image type (typically 3D float image).

See also

ShortestPathCostFunction

ShortestPathImageFilter

Definition at line 48 of file itkShortestPathCostFunctionTbss.h.

Member Typedef Documentation

ConstIteratorType

template<class TInputImageType >

typedef itk::ImageRegionConstIterator<TInputImageType> itk::ShortestPathCostFunctionTbss< TInputImageType >::ConstIteratorType

Definition at line 56 of file itkShortestPathCostFunctionTbss.h.

ConstPointer

template<class TInputImageType >

typedef SmartPointer<const Self> itk::ShortestPathCostFunctionTbss< TInputImageType >::ConstPointer

Definition at line 55 of file itkShortestPathCostFunctionTbss.h.

FloatImageType

template<class TInputImageType >

typedef itk::Image<float, 3> itk::ShortestPathCostFunctionTbss< TInputImageType >::FloatImageType

Definition at line 59 of file itkShortestPathCostFunctionTbss.h.

IndexType

template<class TInputImageType >

typedef TInputImageType::IndexType itk::ShortestPathCostFunctionTbss< TInputImageType >::IndexType

Definition at line 57 of file itkShortestPathCostFunctionTbss.h.

Pointer

template<class TInputImageType >

typedef SmartPointer<Self> itk::ShortestPathCostFunctionTbss< TInputImageType >::Pointer

Definition at line 54 of file itkShortestPathCostFunctionTbss.h.

Self

template<class TInputImageType >

typedef ShortestPathCostFunctionTbss itk::ShortestPathCostFunctionTbss< TInputImageType >::Self

Standard class typedefs.

Definition at line 52 of file itkShortestPathCostFunctionTbss.h.

Superclass

template<class TInputImageType >

typedef ShortestPathCostFunction<TInputImageType> itk::ShortestPathCostFunctionTbss< TInputImageType >::Superclass

Definition at line 53 of file itkShortestPathCostFunctionTbss.h.

Constructor & Destructor Documentation

ShortestPathCostFunctionTbss()

template<class TInputImageType >

itk::ShortestPathCostFunctionTbss< TInputImageType >::ShortestPathCostFunctionTbss ( )

protected

~ShortestPathCostFunctionTbss()

template<class TInputImageType >

itk::ShortestPathCostFunctionTbss< TInputImageType >::~ShortestPathCostFunctionTbss ( )

inlineoverrideprotected

Definition at line 107 of file itkShortestPathCostFunctionTbss.h.

Member Function Documentation

Clone()

template<class TInputImageType >

Pointer itk::ShortestPathCostFunctionTbss< TInputImageType >::Clone

(

)

const

GetClassName()

template<class TInputImageType >

virtual const char* itk::ShortestPathCostFunctionTbss< TInputImageType >::GetClassName ( ) const

virtual

Run-time type information (and related methods).

Reimplemented from itk::ShortestPathCostFunction< TInputImageType >.

GetCost()

template<class TInputImageType >

double itk::ShortestPathCostFunctionTbss< TInputImageType >::GetCost ( IndexType  p1, IndexType  p2  )

overridevirtual

Calculate the cost of transitioning from pixel p1 to pixel p2.

If the intensity at p2 is below the threshold, returns std::numeric_limits<double>::max() (impassable). Otherwise, returns the Euclidean distance plus a penalty of 1000 * (1 - weight).

Parameters

[in]	p1	The source pixel index.
[in]	p2	The destination pixel index.

Returns

The transition cost, or numeric max if below threshold.

Implements itk::ShortestPathCostFunction< TInputImageType >.

GetMinCost()

template<class TInputImageType >

double itk::ShortestPathCostFunctionTbss< TInputImageType >::GetMinCost ( )

overridevirtual

Return the minimal possible cost (needed for A*).

Returns

Always returns 1.0.

Implements itk::ShortestPathCostFunction< TInputImageType >.

Initialize()

template<class TInputImageType >

void itk::ShortestPathCostFunctionTbss< TInputImageType >::Initialize ( )

overridevirtual

Initialize the cost function.

Currently a no-op for the TBSS cost function.

Implements itk::ShortestPathCostFunction< TInputImageType >.

New()

template<class TInputImageType >

static Pointer itk::ShortestPathCostFunctionTbss< TInputImageType >::New ( )

static

Method for creation through the object factory.

SetThreshold()

template<class TInputImageType >

void itk::ShortestPathCostFunctionTbss< TInputImageType >::SetThreshold ( double  t )

inline

Set the intensity threshold below which pixels are impassable.

Pixels with intensity below this value receive infinite cost, effectively restricting paths to the tract skeleton.

Parameters

[in]

t

The threshold value.

Definition at line 102 of file itkShortestPathCostFunctionTbss.h.

References itk::ShortestPathCostFunctionTbss< TInputImageType >::m_Threshold.

Member Data Documentation

m_Threshold

template<class TInputImageType >

double itk::ShortestPathCostFunctionTbss< TInputImageType >::m_Threshold

protected

Intensity threshold below which pixels are impassable.

Definition at line 109 of file itkShortestPathCostFunctionTbss.h.

Referenced by itk::ShortestPathCostFunctionTbss< TInputImageType >::SetThreshold().

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

• itkShortestPathCostFunctionTbss.h