Performs the Hough Transform to find circles in a 2D image. More...

#include <itkHoughTransform2DCirclesImageFilter.h>

Inheritance diagram for itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >:

Collaboration diagram for itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >:

Public Types
typedef CircleType::Pointer	CirclePointer
typedef CirclesListType::size_type	CirclesListSizeType
typedef std::list< CirclePointer >	CirclesListType
typedef EllipseSpatialObject< 2 >	CircleType
typedef SmartPointer< const Self >	ConstPointer
typedef InputImageType::IndexType	IndexType
typedef InputImageType::ConstPointer	InputImageConstPointer
typedef InputImageType::Pointer	InputImagePointer
typedef Image< TInputPixelType, 2 >	InputImageType
typedef OutputImageType::Pointer	OutputImagePointer
typedef InputImageType::RegionType	OutputImageRegionType
typedef Image < TOutputPixelType, 2 >	OutputImageType
typedef InputImageType::PixelType	PixelType
typedef SmartPointer< Self >	Pointer
typedef HoughTransform2DCirclesImageFilter	Self
typedef ImageToImageFilter < Image< TInputPixelType, 2 > , Image< TOutputPixelType, 2 > >	Superclass
Public Member Functions
virtual ::itk::LightObject::Pointer	CreateAnother (void) const
void	GenerateData ()
CirclesListType &	GetCircles (unsigned int n=0)
virtual const char *	GetNameOfClass () const
virtual OutputImageType *	GetRadiusImage ()
virtual double	GetSigmaGradient () const
virtual double	GetThreshold () const
virtual void	SetMaximumRadius (double _arg)
virtual void	SetMinimumRadius (double _arg)
void	SetRadius (double radius)
virtual void	SetSigmaGradient (double _arg)
virtual void	SetThreshold (double _arg)
	typedef (Concept::DivisionOperators< TOutputPixelType, int >) OutputDividedByIntCheck
	typedef (Concept::GreaterThanComparable< PixelType, double >) InputGreaterThanDoubleCheck
	typedef (Concept::AdditiveOperators< TOutputPixelType, int >) OutputPlusIntCheck
	typedef (Concept::Convertible< int, TOutputPixelType >) IntConvertibleToOutputCheck

virtual void	SetNumberOfCircles (unsigned int _arg)
virtual unsigned int	GetNumberOfCircles () const

virtual void	SetDiscRadiusRatio (float _arg)
virtual float	GetDiscRadiusRatio () const

virtual void	SetVariance (float _arg)
virtual float	GetVariance () const

virtual void	SetSweepAngle (float _arg)
virtual float	GetSweepAngle () const
Static Public Member Functions
static Pointer	New ()
Protected Member Functions
void	EnlargeOutputRequestedRegion (DataObject *)
void	GenerateInputRequestedRegion ()
	HoughTransform2DCirclesImageFilter ()
void	PrintSelf (std::ostream &os, Indent indent) const
virtual	~HoughTransform2DCirclesImageFilter ()
Private Member Functions
	HoughTransform2DCirclesImageFilter (const Self &)
void	operator= (const Self &)
Private Attributes
CirclesListType	m_CirclesList
float	m_DiscRadiusRatio
double	m_MaximumRadius
double	m_MinimumRadius
CirclesListSizeType	m_NumberOfCircles
unsigned long	m_OldModifiedTime
CirclesListSizeType	m_OldNumberOfCircles
OutputImagePointer	m_RadiusImage
double	m_SigmaGradient
float	m_SweepAngle
double	m_Threshold
float	m_Variance

Detailed Description

template<typename TInputPixelType, typename TOutputPixelType>
class itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >

Performs the Hough Transform to find circles in a 2D image.

This filter derives from the base class ImageToImageFilter. The input is an image, and all pixels above some threshold are those we want to consider during the process.

This filter produces two output: 1) The accumulator array, which represents probability of centers. 2) The array or radii, which has the radius value at each coordinate point.

When the filter finds a "correct" point, it computes the gradient at this point and draws a regular narrow-banded circle using the minimum and maximum radius given by the user, and fills in the array of radii. The SweepAngle value can be adjusted to improve the segmentation.

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HoughTransform2DCirclesImageFilter

Definition at line 54 of file itkHoughTransform2DCirclesImageFilter.h.