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

#include <itkHoughTransform2DLinesImageFilter.h>

Inheritance diagram for itk::HoughTransform2DLinesImageFilter< TInputPixelType, TOutputPixelType >:

Collaboration diagram for itk::HoughTransform2DLinesImageFilter< TInputPixelType, TOutputPixelType >:

Public Types
typedef SmartPointer< const Self >	ConstPointer
typedef InputImageType::IndexType	IndexType
typedef InputImageType::ConstPointer	InputImageConstPointer
typedef InputImageType::Pointer	InputImagePointer
typedef Image< TInputPixelType, 2 >	InputImageType
typedef LineType::Pointer	LinePointer
typedef LineType::LinePointType	LinePointType
typedef LinesListType::size_type	LinesListSizeType
typedef std::list< LinePointer >	LinesListType
typedef LineSpatialObject< 2 >	LineType
typedef OutputImageType::Pointer	OutputImagePointer
typedef InputImageType::RegionType	OutputImageRegionType
typedef Image < TOutputPixelType, 2 >	OutputImageType
typedef InputImageType::PixelType	PixelType
typedef SmartPointer< Self >	Pointer
typedef HoughTransform2DLinesImageFilter	Self
typedef ImageToImageFilter < InputImageType, OutputImageType >	Superclass
Public Member Functions
virtual ::itk::LightObject::Pointer	CreateAnother (void) const
void	GenerateData ()
virtual float	GetAngleResolution () const
LinesListType &	GetLines (unsigned int n=0)
virtual const char *	GetNameOfClass () const
virtual OutputImageType *	GetSimplifyAccumulator ()
virtual float	GetThreshold () const
virtual void	SetAngleResolution (float _arg)
virtual void	SetThreshold (float _arg)
void	Simplify (void)
	typedef (Concept::GreaterThanComparable< PixelType, float >) InputGreaterThanFloatCheck
	typedef (Concept::AdditiveOperators< TOutputPixelType, int >) OutputPlusIntCheck
	typedef (Concept::Convertible< int, TOutputPixelType >) IntConvertibleToOutputCheck

virtual void	SetNumberOfLines (unsigned int _arg)
virtual unsigned int	GetNumberOfLines () const

virtual void	SetDiscRadius (float _arg)
virtual float	GetDiscRadius () const

virtual void	SetVariance (float _arg)
virtual float	GetVariance () const
Static Public Member Functions
static Pointer	New ()
Protected Member Functions
void	EnlargeOutputRequestedRegion (DataObject *output)
void	GenerateInputRequestedRegion ()
void	GenerateOutputInformation ()
	HoughTransform2DLinesImageFilter ()
void	PrintSelf (std::ostream &os, Indent indent) const
virtual	~HoughTransform2DLinesImageFilter ()
Private Member Functions
	HoughTransform2DLinesImageFilter (const Self &)
void	operator= (const Self &)
Private Attributes
float	m_AngleResolution
float	m_DiscRadius
LinesListType	m_LinesList
LinesListSizeType	m_NumberOfLines
unsigned long	m_OldModifiedTime
LinesListSizeType	m_OldNumberOfLines
OutputImagePointer	m_SimplifyAccumulator
float	m_Threshold
float	m_Variance

Detailed Description

template<typename TInputPixelType, typename TOutputPixelType>
class itk::HoughTransform2DLinesImageFilter< TInputPixelType, TOutputPixelType >

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

This filter derives from ImageToImageFilter. The input is an image, and all pixels above some threshold are those to be extracted. The output is the image of the accumulator. GetLines() returns a list of LinesSpatialObjects.

Lines are parameterized in the form: R = x*vcl_cos(Teta)+y*vcl_sin(Teta) where R is the perpendicular distance from the origin and Teta the angle with the normal.

The output is the accumulator array: -The first dimension (X) represents the distance R from the corner to the line -The second dimension (Y) represents the angle between the X axis and the normal to the line.

The size of the array depends on the AngleAxisSize that could be set (500 by default) for the angle axis. The distance axis depends on the size of the diagonal of the input image.

See also:: LineSpatialObject

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HoughTransform2DLinesImageFilter

Definition at line 62 of file itkHoughTransform2DLinesImageFilter.h.