itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType > Class Template Reference
[Image Feature Extraction Filters]

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

#include <itkHoughTransform2DCirclesImageFilter.h>

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

[legend]Collaboration diagram for itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >:

[legend]List of all members.

Public Types
typedef HoughTransform2DCirclesImageFilter	Self
typedef Image< TInputPixelType, 2 >	InputImageType
typedef InputImageType::Pointer	InputImagePointer
typedef InputImageType::ConstPointer	InputImageConstPointer
typedef Image< TOutputPixelType, 2 >	OutputImageType
typedef OutputImageType::Pointer	OutputImagePointer
typedef ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >	Superclass
typedef SmartPointer< Self >	Pointer
typedef SmartPointer< const Self >	ConstPointer
typedef InputImageType::IndexType	IndexType
typedef InputImageType::PixelType	PixelType
typedef InputImageType::RegionType	OutputImageRegionType
typedef EllipseSpatialObject< 2 >	CircleType
typedef CircleType::Pointer	CirclePointer
typedef std::list< CirclePointer >	CirclesListType
Public Member Functions
virtual const char *	GetClassName () const
void	GenerateData ()
void	SetRadius (double radius)
virtual void	SetMinimumRadius (double _arg)
virtual void	SetMaximumRadius (double _arg)
virtual void	SetThreshold (double _arg)
virtual double	GetThreshold ()
virtual OutputImageType *	GetRadiusImage ()
virtual void	SetSigmaGradient (double _arg)
virtual double	GetSigmaGradient ()
CirclesListType &	GetCircles (unsigned int n=0)
virtual void	SetNumberOfCircles (unsigned int _arg)
virtual unsigned int	GetNumberOfCircles ()
virtual void	SetDiscRadiusRatio (float _arg)
virtual float	GetDiscRadiusRatio ()
virtual void	SetVariance (float _arg)
virtual float	GetVariance ()
virtual void	SetSweepAngle (float _arg)
virtual float	GetSweepAngle ()
Static Public Member Functions
Pointer	New ()
Protected Member Functions
	HoughTransform2DCirclesImageFilter ()
virtual	~HoughTransform2DCirclesImageFilter ()
	HoughTransform2DCirclesImageFilter (const Self &)
void	operator= (const Self &)
void	PrintSelf (std::ostream &os, Indent indent) const
void	GenerateInputRequestedRegion ()
void	EnlargeOutputRequestedRegion (DataObject *)

---

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

Definition at line 53 of file itkHoughTransform2DCirclesImageFilter.h.

---

Member Typedef Documentation

template<typename TInputPixelType, typename TOutputPixelType> typedef CircleType::Pointer itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::CirclePointer

Definition at line 90 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef std::list<CirclePointer> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::CirclesListType

Definition at line 91 of file itkHoughTransform2DCirclesImageFilter.h. Referenced by itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::HoughTransform2DCirclesImageFilter().

template<typename TInputPixelType, typename TOutputPixelType> typedef EllipseSpatialObject<2> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::CircleType

Circle typedef Definition at line 89 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef SmartPointer<const Self> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::ConstPointer

Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 77 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef InputImageType::IndexType itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::IndexType

Image index typedef Definition at line 80 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef InputImageType::ConstPointer itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::InputImageConstPointer

Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 64 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef InputImageType::Pointer itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::InputImagePointer

Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 63 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef Image<TInputPixelType,2> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::InputImageType

Input Image typedef Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 62 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef OutputImageType::Pointer itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::OutputImagePointer

Reimplemented from itk::ImageSource< Image< TOutputPixelType, 2 > >. Definition at line 68 of file itkHoughTransform2DCirclesImageFilter.h. Referenced by itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::HoughTransform2DCirclesImageFilter().

template<typename TInputPixelType, typename TOutputPixelType> typedef InputImageType::RegionType itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::OutputImageRegionType

Typedef to describe the output image region type. Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 86 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef Image<TOutputPixelType,2> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::OutputImageType

Output Image typedef Reimplemented from itk::ImageSource< Image< TOutputPixelType, 2 > >. Definition at line 67 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef InputImageType::PixelType itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::PixelType

Image pixel value typedef Definition at line 83 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef SmartPointer<Self> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::Pointer

Smart pointer typedef support. Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 76 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef HoughTransform2DCirclesImageFilter itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::Self

Standard "Self" typedef. Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 59 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> typedef ImageToImageFilter< Image<TInputPixelType,2> , Image<TOutputPixelType,2> > itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::Superclass

Standard "Superclass" typedef. Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 73 of file itkHoughTransform2DCirclesImageFilter.h.

---

Constructor & Destructor Documentation

template<typename TInputPixelType, typename TOutputPixelType> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::HoughTransform2DCirclesImageFilter (   )  [protected]

template<typename TInputPixelType, typename TOutputPixelType> virtual itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::~HoughTransform2DCirclesImageFilter (   )  [inline, protected, virtual]

Definition at line 154 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::HoughTransform2DCirclesImageFilter (  const Self &   )  [inline, protected]

Definition at line 156 of file itkHoughTransform2DCirclesImageFilter.h. References itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::CirclesListType, and itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::OutputImagePointer.

---

Member Function Documentation

template<typename TInputPixelType, typename TOutputPixelType> void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::EnlargeOutputRequestedRegion (  DataObject *   )  [protected, virtual]

HoughTransform2DCirclesImageFilter's produces all the output. Therefore, it must provide an implementation of EnlargeOutputRequestedRegion. See also: ProcessObject::EnlargeOutputRequestedRegion() Reimplemented from itk::ProcessObject.

template<typename TInputPixelType, typename TOutputPixelType> void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GenerateData (   )  [virtual]

Method for evaluating the implicit function over the image. Reimplemented from itk::ImageSource< Image< TOutputPixelType, 2 > >.

template<typename TInputPixelType, typename TOutputPixelType> void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GenerateInputRequestedRegion (   )  [protected, virtual]

HoughTransform2DCirclesImageFilter needs the entire input. Therefore it must provide an implementation GenerateInputRequestedRegion(). See also: ProcessObject::GenerateInputRequestedRegion(). Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >.

template<typename TInputPixelType, typename TOutputPixelType> CirclesListType& itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetCircles (  unsigned int  n = 0  )

Get the list of circles. This recomputes the circles

template<typename TInputPixelType, typename TOutputPixelType> virtual const char* itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetClassName (   )  const [virtual]

Run-time type information (and related methods). Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >.

template<typename TInputPixelType, typename TOutputPixelType> virtual float itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetDiscRadiusRatio (   )  [virtual]

Set/Get the radius of the disc to remove from the accumulator for each circle found

template<typename TInputPixelType, typename TOutputPixelType> virtual unsigned int itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetNumberOfCircles (   )  [virtual]

Set/Get the number of circles to extract

template<typename TInputPixelType, typename TOutputPixelType> virtual OutputImageType* itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetRadiusImage (   )  [virtual]

Get the radius image

template<typename TInputPixelType, typename TOutputPixelType> virtual double itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetSigmaGradient (   )  [virtual]

Get the scale value

template<typename TInputPixelType, typename TOutputPixelType> virtual float itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetSweepAngle (   )  [virtual]

Set the sweep angle

template<typename TInputPixelType, typename TOutputPixelType> virtual double itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetThreshold (   )  [virtual]

Get the threshold value

template<typename TInputPixelType, typename TOutputPixelType> virtual float itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::GetVariance (   )  [virtual]

Set the variance of the gaussian bluring for the accumulator

template<typename TInputPixelType, typename TOutputPixelType> Pointer itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::New (   )  [static]

Method for creation through the object factory. Reimplemented from itk::Object.

template<typename TInputPixelType, typename TOutputPixelType> void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::operator= (  const Self &   )  [inline, protected]

Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >. Definition at line 157 of file itkHoughTransform2DCirclesImageFilter.h.

template<typename TInputPixelType, typename TOutputPixelType> void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::PrintSelf (  std::ostream &  os, Indent  indent )  const [protected, virtual]

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes. Reimplemented from itk::ImageToImageFilter< Image< TInputPixelType, 2 >, Image< TOutputPixelType, 2 > >.

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetDiscRadiusRatio (  float  _arg  )  [virtual]

Set/Get the radius of the disc to remove from the accumulator for each circle found

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetMaximumRadius (  double  _arg  )  [virtual]

Set the maximum radius value the filter should look for

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetMinimumRadius (  double  _arg  )  [virtual]

Set the minimum radiu value the filter should look for

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetNumberOfCircles (  unsigned int  _arg  )  [virtual]

Set/Get the number of circles to extract

template<typename TInputPixelType, typename TOutputPixelType> void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetRadius (  double  radius  )

Set both Minimum and Maximum radius values

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetSigmaGradient (  double  _arg  )  [virtual]

Set the scale of the derivative function (using DoG)

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetSweepAngle (  float  _arg  )  [virtual]

Set the sweep angle

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetThreshold (  double  _arg  )  [virtual]

Set the threshold above which the filter should consider the point as a valid point

template<typename TInputPixelType, typename TOutputPixelType> virtual void itk::HoughTransform2DCirclesImageFilter< TInputPixelType, TOutputPixelType >::SetVariance (  float  _arg  )  [virtual]

Set the variance of the gaussian bluring for the accumulator

---

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

• itkHoughTransform2DCirclesImageFilter.h

---