itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage > Class Template Reference

#include <itkCannyEdgeDetectionImageFilter.h>

Inheritance diagram for itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >:

Collaboration diagram for itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >:

List of all members.

Classes
struct	CannyThreadStruct

Public Types
typedef FixedArray< double, itkGetStaticConstMacro(ImageDimension) >	ArrayType
typedef SmartPointer< const Self >	ConstPointer
typedef ZeroFluxNeumannBoundaryCondition < OutputImageType >	DefaultBoundaryConditionType
typedef TInputImage::IndexType	IndexType
typedef TInputImage::PixelType	InputImagePixelType
typedef TInputImage::RegionType	InputImageRegionType
typedef TInputImage	InputImageType
typedef ObjectStore< ListNodeType >	ListNodeStorageType
typedef ListNode< IndexType >	ListNodeType
typedef ListType::Pointer	ListPointerType
typedef SparseFieldLayer < ListNodeType >	ListType
typedef ConstNeighborhoodIterator < OutputImageType, DefaultBoundaryConditionType >	NeighborhoodType
typedef TOutputImage::PixelType	OutputImagePixelType
typedef TOutputImage::RegionType	OutputImageRegionType
typedef TOutputImage	OutputImageType
typedef SmartPointer< Self >	Pointer
typedef CannyEdgeDetectionImageFilter	Self
typedef TInputImage::SizeValueType	SizeValueType
typedef ImageToImageFilter < TInputImage, TOutputImage >	Superclass
Public Types inherited from itk::ImageToImageFilter< TInputImage, TOutputImage >
typedef InputImageType::ConstPointer	InputImageConstPointer
typedef InputImageType::Pointer	InputImagePointer
Public Types inherited from itk::ImageSource< TOutputImage >
typedef Superclass::DataObjectIdentifierType	DataObjectIdentifierType
typedef DataObject::Pointer	DataObjectPointer
typedef Superclass::DataObjectPointerArraySizeType	DataObjectPointerArraySizeType
typedef OutputImageType::Pointer	OutputImagePointer
Public Types inherited from itk::ProcessObject
typedef std::vector < DataObjectPointer >	DataObjectPointerArray
typedef std::vector < DataObjectIdentifierType >	NameArray
Public Types inherited from itk::Object
Public Types inherited from itk::LightObject

Public Member Functions
virtual ::itk::LightObject::Pointer	CreateAnother (void) const
virtual void	GenerateInputRequestedRegion () throw ( InvalidRequestedRegionError )
virtual OutputImagePixelType	GetLowerThreshold () const
virtual const char *	GetNameOfClass () const
OutputImageType *	GetNonMaximumSuppressionImage ()
virtual OutputImagePixelType	GetUpperThreshold () const
virtual void	SetLowerThreshold (OutputImagePixelType _arg)
virtual void	SetUpperThreshold (OutputImagePixelType _arg)
	typedef (Concept::HasNumericTraits< InputImagePixelType >) InputHasNumericTraitsCheck
	typedef (Concept::HasNumericTraits< OutputImagePixelType >) OutputHasNumericTraitsCheck
	typedef (Concept::SameDimension< ImageDimension, OutputImageDimension >) SameDimensionCheck
	typedef (Concept::IsFloatingPoint< InputImagePixelType >) InputIsFloatingPointCheck
	typedef (Concept::IsFloatingPoint< OutputImagePixelType >) OutputIsFloatingPointCheck
virtual void	SetVariance (ArrayType _arg)
virtual const ArrayType	GetVariance () const
virtual void	SetMaximumError (ArrayType _arg)
virtual const ArrayType	GetMaximumError () const
void	SetVariance (const typename ArrayType::ValueType v)
void	SetMaximumError (const typename ArrayType::ValueType v)
Public Member Functions inherited from itk::ImageToImageFilter< TInputImage, TOutputImage >
const InputImageType *	GetInput (void) const
const InputImageType *	GetInput (unsigned int idx) const
virtual void	PopBackInput ()
virtual void	PopFrontInput ()
virtual void	PushBackInput (const InputImageType *image)
virtual void	PushFrontInput (const InputImageType *image)
virtual void	SetInput (const InputImageType *image)
virtual void	SetInput (unsigned int, const TInputImage *image)
Public Member Functions inherited from itk::ImageSource< TOutputImage >
OutputImageType *	GetOutput (unsigned int idx)
virtual void	GraftNthOutput (unsigned int idx, DataObject *output)
virtual void	GraftOutput (DataObject *output)
virtual void	GraftOutput (const DataObjectIdentifierType &key, DataObject *output)
OutputImageType *	GetOutput (void)
const OutputImageType *	GetOutput (void) const
virtual ProcessObject::DataObjectPointer	MakeOutput (ProcessObject::DataObjectPointerArraySizeType idx)
Public Member Functions inherited from itk::ProcessObject
virtual void	AbortGenerateDataOff ()
virtual void	AbortGenerateDataOn ()
virtual void	EnlargeOutputRequestedRegion (DataObject *)
virtual const bool &	GetAbortGenerateData ()
NameArray	GetInputNames () const
MultiThreader *	GetMultiThreader () const
DataObjectPointerArraySizeType	GetNumberOfIndexedInputs () const
DataObjectPointerArraySizeType	GetNumberOfInputs () const
DataObjectPointerArraySizeType	GetNumberOfOutputs () const
virtual DataObjectPointerArraySizeType	GetNumberOfValidRequiredInputs () const
NameArray	GetOutputNames () const
virtual const float &	GetProgress ()
NameArray	GetRequiredInputNames () const
bool	HasInput (const DataObjectIdentifierType &key) const
bool	HasOutput (const DataObjectIdentifierType &key) const
virtual DataObjectPointer	MakeOutput (const DataObjectIdentifierType &)
virtual void	PrepareOutputs ()
virtual void	PropagateRequestedRegion (DataObject *output)
virtual void	ResetPipeline ()
virtual void	SetAbortGenerateData (bool _arg)
virtual void	SetProgress (float _arg)
virtual void	Update ()
virtual void	UpdateLargestPossibleRegion ()
virtual void	UpdateOutputData (DataObject *output)
virtual void	UpdateOutputInformation ()
void	UpdateProgress (float amount)
DataObjectPointerArray	GetInputs ()
DataObjectPointerArray	GetOutputs ()
DataObjectPointerArray	GetIndexedInputs ()
DataObjectPointerArray	GetIndexedOutputs ()
DataObjectPointerArraySizeType	GetNumberOfIndexedOutputs () const
virtual void	SetReleaseDataFlag (bool flag)
virtual bool	GetReleaseDataFlag () const
void	ReleaseDataFlagOn ()
void	ReleaseDataFlagOff ()
virtual void	SetReleaseDataBeforeUpdateFlag (bool _arg)
virtual const bool &	GetReleaseDataBeforeUpdateFlag ()
virtual void	ReleaseDataBeforeUpdateFlagOn ()
virtual void	ReleaseDataBeforeUpdateFlagOff ()
virtual void	SetNumberOfThreads (ThreadIdType _arg)
virtual const ThreadIdType &	GetNumberOfThreads ()
Public Member Functions inherited from itk::Object
unsigned long	AddObserver (const EventObject &event, Command *)
unsigned long	AddObserver (const EventObject &event, Command *) const
virtual void	DebugOff () const
virtual void	DebugOn () const
Command *	GetCommand (unsigned long tag)
bool	GetDebug () const
MetaDataDictionary &	GetMetaDataDictionary (void)
const MetaDataDictionary &	GetMetaDataDictionary (void) const
virtual unsigned long	GetMTime () const
virtual const TimeStamp &	GetTimeStamp () const
bool	HasObserver (const EventObject &event) const
void	InvokeEvent (const EventObject &)
void	InvokeEvent (const EventObject &) const
virtual void	Modified () const
virtual void	Register () const
void	RemoveAllObservers ()
void	RemoveObserver (unsigned long tag)
void	SetDebug (bool debugFlag) const
void	SetMetaDataDictionary (const MetaDataDictionary &rhs)
virtual void	SetReferenceCount (int)
virtual void	UnRegister () const
Public Member Functions inherited from itk::LightObject
virtual void	Delete ()
virtual int	GetReferenceCount () const
	itkCloneMacro (Self)
void	Print (std::ostream &os, Indent indent=0) const

Static Public Member Functions
static Pointer	New ()

Static Public Attributes
static const unsigned int	ImageDimension = TInputImage::ImageDimension
static const unsigned int	OutputImageDimension = TOutputImage::ImageDimension
Static Public Attributes inherited from itk::ImageToImageFilter< TInputImage, TOutputImage >
static const unsigned int	InputImageDimension = TInputImage::ImageDimension
Static Public Attributes inherited from itk::ImageSource< TOutputImage >

Protected Types
typedef DiscreteGaussianImageFilter < InputImageType, OutputImageType >	GaussianImageFilterType
typedef MultiplyImageFilter < OutputImageType, OutputImageType, OutputImageType >	MultiplyImageFilterType
Protected Types inherited from itk::ImageToImageFilter< TInputImage, TOutputImage >
typedef ImageToImageFilterDetail::ImageRegionCopier < itkGetStaticConstMacro(OutputImageDimension), itkGetStaticConstMacro(InputImageDimension) >	InputToOutputRegionCopierType
typedef ImageToImageFilterDetail::ImageRegionCopier < itkGetStaticConstMacro(InputImageDimension), itkGetStaticConstMacro(OutputImageDimension) >	OutputToInputRegionCopierType

Protected Member Functions
void	GenerateData ()
	CannyEdgeDetectionImageFilter ()
void	PrintSelf (std::ostream &os, Indent indent) const
Protected Member Functions inherited from itk::ImageToImageFilter< TInputImage, TOutputImage >
virtual void	CallCopyInputRegionToOutputRegion (OutputImageRegionType &destRegion, const InputImageRegionType &srcRegion)
virtual void	CallCopyOutputRegionToInputRegion (InputImageRegionType &destRegion, const OutputImageRegionType &srcRegion)
	ImageToImageFilter ()
virtual void	VerifyInputInformation ()
	~ImageToImageFilter ()
void	PushBackInput (const DataObject *input)
void	PushFrontInput (const DataObject *input)
Protected Member Functions inherited from itk::ImageSource< TOutputImage >
virtual void	AfterThreadedGenerateData ()
virtual void	AllocateOutputs ()
virtual void	BeforeThreadedGenerateData ()
	ImageSource ()
virtual unsigned int	SplitRequestedRegion (unsigned int i, unsigned int num, OutputImageRegionType &splitRegion)
virtual void	ThreadedGenerateData (const OutputImageRegionType &outputRegionForThread, ThreadIdType threadId)
virtual	~ImageSource ()
Protected Member Functions inherited from itk::ProcessObject
virtual void	AddInput (DataObject *input)
virtual void	AddOutput (DataObject *output)
bool	AddRequiredInputName (const DataObjectIdentifierType &)
virtual void	CacheInputReleaseDataFlags ()
virtual void	GenerateOutputInformation ()
virtual void	GenerateOutputRequestedRegion (DataObject *output)
virtual const DataObjectPointerArraySizeType &	GetNumberOfRequiredInputs ()
virtual const DataObjectPointerArraySizeType &	GetNumberOfRequiredOutputs ()
bool	IsIndexedName (const DataObjectIdentifierType &) const
bool	IsRequiredInputName (const DataObjectIdentifierType &) const
	itkLegacyMacro (virtual void RemoveInput(DataObject *input))
	itkLegacyMacro (virtual void RemoveOutput(DataObject *output))
	itkLegacyMacro (void SetNumberOfInputs(DataObjectPointerArraySizeType num))
	itkLegacyMacro (void SetNumberOfOutputs(DataObjectPointerArraySizeType num))
DataObjectPointerArraySizeType	MakeIndexFromName (const DataObjectIdentifierType &) const
DataObjectIdentifierType	MakeNameFromIndex (DataObjectPointerArraySizeType) const
	ProcessObject ()
virtual void	PropagateResetPipeline ()
virtual void	ReleaseInputs ()
virtual void	RemoveInput (const DataObjectIdentifierType &key)
virtual void	RemoveInput (DataObjectPointerArraySizeType)
virtual void	RemoveOutput (const DataObjectIdentifierType &key)
virtual void	RemoveOutput (DataObjectPointerArraySizeType idx)
bool	RemoveRequiredInputName (const DataObjectIdentifierType &)
virtual void	RestoreInputReleaseDataFlags ()
virtual void	SetInput (const DataObjectIdentifierType &key, DataObject *input)
virtual void	SetNthInput (DataObjectPointerArraySizeType num, DataObject *input)
virtual void	SetNthOutput (DataObjectPointerArraySizeType num, DataObject *output)
void	SetNumberOfIndexedInputs (DataObjectPointerArraySizeType num)
void	SetNumberOfIndexedOutputs (DataObjectPointerArraySizeType num)
virtual void	SetNumberOfRequiredInputs (DataObjectPointerArraySizeType)
virtual void	SetNumberOfRequiredOutputs (DataObjectPointerArraySizeType _arg)
virtual void	SetOutput (const DataObjectIdentifierType &key, DataObject *output)
virtual void	SetPrimaryInput (DataObject *input)
virtual void	SetPrimaryOutput (DataObject *output)
void	SetRequiredInputNames (const NameArray &)
virtual void	VerifyPreconditions ()
	~ProcessObject ()
DataObject *	GetInput (const DataObjectIdentifierType &key)
const DataObject *	GetInput (const DataObjectIdentifierType &key) const
DataObject *	GetInput (DataObjectPointerArraySizeType)
const DataObject *	GetInput (DataObjectPointerArraySizeType idx) const
DataObject *	GetPrimaryInput ()
const DataObject *	GetPrimaryInput () const
DataObject *	GetOutput (const DataObjectIdentifierType &key)
const DataObject *	GetOutput (const DataObjectIdentifierType &key) const
DataObject *	GetOutput (DataObjectPointerArraySizeType idx)
const DataObject *	GetOutput (DataObjectPointerArraySizeType idx) const
DataObject *	GetPrimaryOutput ()
const DataObject *	GetPrimaryOutput () const
Protected Member Functions inherited from itk::Object
	Object ()
bool	PrintObservers (std::ostream &os, Indent indent) const
virtual void	SetTimeStamp (const TimeStamp &time)
virtual	~Object ()
Protected Member Functions inherited from itk::LightObject
virtual LightObject::Pointer	InternalClone () const
	LightObject ()
virtual void	PrintHeader (std::ostream &os, Indent indent) const
virtual void	PrintTrailer (std::ostream &os, Indent indent) const
virtual	~LightObject ()

Private Member Functions
void	AllocateUpdateBuffer ()
	CannyEdgeDetectionImageFilter (const Self &)
void	Compute2ndDerivative ()
void	Compute2ndDerivativePos ()
OutputImagePixelType	ComputeCannyEdge (const NeighborhoodType &it, void *globalData)
void	FollowEdge (IndexType index)
void	HysteresisThresholding ()
void	operator= (const Self &)
void	ThreadedCompute2ndDerivative (const OutputImageRegionType &outputRegionForThread, ThreadIdType threadId)
void	ThreadedCompute2ndDerivativePos (const OutputImageRegionType &outputRegionForThread, ThreadIdType threadId)
virtual	~CannyEdgeDetectionImageFilter ()

Static Private Member Functions
static ITK_THREAD_RETURN_TYPE	Compute2ndDerivativePosThreaderCallback (void *arg)
static ITK_THREAD_RETURN_TYPE	Compute2ndDerivativeThreaderCallback (void *arg)

Private Attributes
SizeValueType	m_Center
std::slice	m_ComputeCannyEdgeSlice [ImageDimension]
GaussianImageFilterType::Pointer	m_GaussianFilter
OutputImagePixelType	m_LowerThreshold
ArrayType	m_MaximumError
MultiplyImageFilterType::Pointer	m_MultiplyImageFilter
ListPointerType	m_NodeList
ListNodeStorageType::Pointer	m_NodeStore
SizeValueType	m_Stride [ImageDimension]
OutputImageType::Pointer	m_UpdateBuffer1
OutputImagePixelType	m_UpperThreshold
ArrayType	m_Variance
DerivativeOperator < OutputImagePixelType, itkGetStaticConstMacro(ImageDimension) >	m_ComputeCannyEdge1stDerivativeOper
DerivativeOperator < OutputImagePixelType, itkGetStaticConstMacro(ImageDimension) >	m_ComputeCannyEdge2ndDerivativeOper

---

Detailed Description

template<class TInputImage, class TOutputImage>
class itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >

This filter is an implementation of a Canny edge detector for scalar-valued images. Based on John Canny's paper "A Computational Approach to Edge Detection"(IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. PAMI-8, No.6, November 1986), there are four major steps used in the edge-detection scheme: (1) Smooth the input image with Gaussian filter. (2) Calculate the second directional derivatives of the smoothed image. (3) Non-Maximum Suppression: the zero-crossings of 2nd derivative are found, and the sign of third derivative is used to find the correct extrema. (4) The hysteresis thresholding is applied to the gradient magnitude (multiplied with zero-crossings) of the smoothed image to find and link edges.

Inputs and Outputs

The input to this filter should be a scalar, real-valued Itk image of arbitrary dimension. The output should also be a scalar, real-value Itk image of the same dimensionality.

Parameters

There are four parameters for this filter that control the sub-filters used by the algorithm.

Variance and Maximum error are used in the Gaussian smoothing of the input image. See itkDiscreteGaussianImageFilter for information on these parameters.

Threshold is the lowest allowed value in the output image. Its data type is the same as the data type of the output image. Any values below the Threshold level will be replaced with the OutsideValue parameter value, whose default is zero.

Todo:

Edge-linking will be added when an itk connected component labeling algorithm is available.

See also:

DiscreteGaussianImageFilter

ZeroCrossingImageFilter

ThresholdImageFilter

Definition at line 84 of file itkCannyEdgeDetectionImageFilter.h.

---

Member Typedef Documentation

template<class TInputImage, class TOutputImage>

typedef FixedArray< double, itkGetStaticConstMacro(ImageDimension) > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ArrayType

Typedef of double containers

Definition at line 140 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef SmartPointer< const Self > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ConstPointer

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 98 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef ZeroFluxNeumannBoundaryCondition< OutputImageType > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::DefaultBoundaryConditionType

The default boundary condition is used unless overridden *in the Evaluate() method.

Definition at line 109 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef DiscreteGaussianImageFilter< InputImageType, OutputImageType > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GaussianImageFilterType

protected

Definition at line 235 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TInputImage::IndexType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::IndexType

Definition at line 103 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TInputImage::PixelType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::InputImagePixelType

Define pixel types.

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 101 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TInputImage::RegionType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::InputImageRegionType

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 127 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TInputImage itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::InputImageType

Image typedef support

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 93 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef ObjectStore< ListNodeType > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListNodeStorageType

Definition at line 118 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef ListNode< IndexType > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListNodeType

Definition at line 117 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef ListType::Pointer itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListPointerType

Definition at line 120 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef SparseFieldLayer< ListNodeType > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListType

Definition at line 119 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef MultiplyImageFilter< OutputImageType, OutputImageType, OutputImageType > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::MultiplyImageFilterType

protected

Definition at line 237 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef ConstNeighborhoodIterator< OutputImageType, DefaultBoundaryConditionType > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::NeighborhoodType

The type of data structure that is passed to this function object to evaluate at a pixel that does not lie on a data set boundary.

Definition at line 115 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TOutputImage::PixelType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::OutputImagePixelType

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 102 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TOutputImage::RegionType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::OutputImageRegionType

Typedef to describe the output image region type.

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 123 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TOutputImage itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::OutputImageType

Some convenient typedefs.

Reimplemented from itk::ImageSource< TOutputImage >.

Definition at line 94 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef SmartPointer< Self > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Pointer

SmartPointer typedef support

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 97 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef CannyEdgeDetectionImageFilter itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Self

Standard "Self" & Superclass typedef.

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 89 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef TInputImage::SizeValueType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SizeValueType

Definition at line 104 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

typedef ImageToImageFilter< TInputImage, TOutputImage > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Superclass

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 90 of file itkCannyEdgeDetectionImageFilter.h.

---

Constructor & Destructor Documentation

template<class TInputImage, class TOutputImage>

itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::CannyEdgeDetectionImageFilter ( )

protected

End concept checking

template<class TInputImage, class TOutputImage>

itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::CannyEdgeDetectionImageFilter ( const Self &  )

private

template<class TInputImage, class TOutputImage>

virtual itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::~CannyEdgeDetectionImageFilter ( )

inlineprivatevirtual

Definition at line 242 of file itkCannyEdgeDetectionImageFilter.h.

---

Member Function Documentation

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::AllocateUpdateBuffer ( )

private

This allocate storage for m_UpdateBuffer, m_UpdateBuffer1

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Compute2ndDerivative ( )

private

Calculate the second derivative of the smoothed image, it writes the result to m_UpdateBuffer using the ThreadedCompute2ndDerivative() method and multithreading mechanism.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Compute2ndDerivativePos ( )

private

Calculate the gradient of the second derivative of the smoothed image, it writes the result to m_UpdateBuffer1 using the ThreadedCompute2ndDerivativePos() method and multithreading mechanism.

template<class TInputImage, class TOutputImage>

static ITK_THREAD_RETURN_TYPE itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Compute2ndDerivativePosThreaderCallback ( void *  arg )

staticprivate

This callback method uses ImageSource::SplitRequestedRegion to acquire an output region that it passes to ThreadedCompute2ndDerivative for processing.

template<class TInputImage, class TOutputImage>

static ITK_THREAD_RETURN_TYPE itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Compute2ndDerivativeThreaderCallback ( void *  arg )

staticprivate

This callback method uses ImageSource::SplitRequestedRegion to acquire an output region that it passes to ThreadedCompute2ndDerivative for processing.

template<class TInputImage, class TOutputImage>

OutputImagePixelType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ComputeCannyEdge ( const NeighborhoodType &  it, void *  globalData  )

private

This methos is used to calculate the 2nd derivative for non-boundary pixels. It is called by the ThreadedCompute2ndDerivative method.

template<class TInputImage, class TOutputImage>

virtual::itk::LightObject::Pointer itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::CreateAnother ( void  ) const

virtual

Create an object from an instance, potentially deferring to a factory. This method allows you to create an instance of an object that is exactly the same type as the referring object. This is useful in cases where an object has been cast back to a base class.

Reimplemented from itk::Object.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::FollowEdge ( IndexType  index )

private

Edge linking funciton

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GenerateData ( )

protectedvirtual

A version of GenerateData() specific for image processing filters. This implementation will split the processing across multiple threads. The buffer is allocated by this method. Then the BeforeThreadedGenerateData() method is called (if provided). Then, a series of threads are spawned each calling ThreadedGenerateData(). After all the threads have completed processing, the AfterThreadedGenerateData() method is called (if provided). If an image processing filter cannot be threaded, the filter should provide an implementation of GenerateData(). That implementation is responsible for allocating the output buffer. If a filter an be threaded, it should NOT provide a GenerateData() method but should provide a ThreadedGenerateData() instead.

See also:

ThreadedGenerateData()

Reimplemented from itk::ImageSource< TOutputImage >.

template<class TInputImage, class TOutputImage>

virtual void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GenerateInputRequestedRegion ( ) throw ( InvalidRequestedRegionError )

virtual

CannyEdgeDetectionImageFilter needs a larger input requested region than the output requested region ( derivative operators, etc). As such, CannyEdgeDetectionImageFilter needs to provide an implementation for GenerateInputRequestedRegion() in order to inform the pipeline execution model.

See also:

ImageToImageFilter::GenerateInputRequestedRegion()

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage>

virtual OutputImagePixelType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GetLowerThreshold ( ) const

virtual

template<class TInputImage, class TOutputImage>

virtual const ArrayType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GetMaximumError ( ) const

virtual

Standard get/set macros for filter parameters.

template<class TInputImage, class TOutputImage>

virtual const char* itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GetNameOfClass ( ) const

virtual

Run-time type information (and related methods).

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage>

OutputImageType* itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GetNonMaximumSuppressionImage ( )

inline

Definition at line 197 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

virtual OutputImagePixelType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GetUpperThreshold ( ) const

virtual

template<class TInputImage, class TOutputImage>

virtual const ArrayType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::GetVariance ( ) const

virtual

Standard get/set macros for filter parameters.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::HysteresisThresholding ( )

private

Implement hysteresis thresholding

template<class TInputImage, class TOutputImage>

static Pointer itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::New ( )

static

Method for creation through the object factory.

Reimplemented from itk::Object.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::operator= ( const Self &  )

private

PushBackInput(), PushFronInput() in the public section force the input to be the type expected by an ImageToImageFilter. However, these methods end of "hiding" the versions from the superclass (ProcessObject) whose arguments are DataObjects. Here, we re-expose the versions from ProcessObject to avoid warnings about hiding methods from the superclass.

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::PrintSelf ( std::ostream &  os, Indent  indent  ) const

protectedvirtual

End concept checking

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage>

virtual void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SetLowerThreshold ( OutputImagePixelType  _arg )

virtual

template<class TInputImage, class TOutputImage>

virtual void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SetMaximumError ( ArrayType  _arg )

virtual

Standard get/set macros for filter parameters.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SetMaximumError ( const typename ArrayType::ValueType  v )

inline

Set/Get the MaximumError parameter used by the Gaussian smoothing filter in this algorithm

Definition at line 167 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

virtual void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SetUpperThreshold ( OutputImagePixelType  _arg )

virtual

TODO: Document in the ITKv4 migration guide that the SetThreshold member function was removed from the CannyEdgeDetectionImageFilter, and that both UpperThreshold and LowerThreshold need to be set. To get the same results as with the SetThreshold method change "myfilter->SetThrehsold" to "myfilter->SetUpperThreshold", and add "myfilter->SetLowerThreshold(GetUpperThreshold()/2.0)"* Set the Threshold value for detected edges. */

template<class TInputImage, class TOutputImage>

virtual void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SetVariance ( ArrayType  _arg )

virtual

Standard get/set macros for filter parameters.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SetVariance ( const typename ArrayType::ValueType  v )

inline

Set/Get the Variance parameter used by the Gaussian smoothing filter in this algorithm

Definition at line 151 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ThreadedCompute2ndDerivative ( const OutputImageRegionType &  outputRegionForThread, ThreadIdType  threadId  )

private

Split the input into "num" pieces, returning region "i" as "splitRegion". This method is called "num" times to return non-overlapping regions. The method returns the number of pieces that the input can be split into by the routine. i.e. return value is less than or equal to "num".

See also:

ImageSource Does the actual work of calculating of the 2nd derivative over a region supplied by the multithreading mechanism.

Compute2ndDerivative

Compute2ndDerivativeThreaderCallBack

template<class TInputImage, class TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ThreadedCompute2ndDerivativePos ( const OutputImageRegionType &  outputRegionForThread, ThreadIdType  threadId  )

private

Does the actual work of calculating of the 2nd derivative over a region supplied by the multithreading mechanism.

See also:

Compute2ndDerivativePos

Compute3ndDerivativePosThreaderCallBack

template<class TInputImage, class TOutputImage>

itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::typedef

(

Concept::HasNumericTraits< InputImagePixelType >

)

Begin concept checking This class requires InputHasNumericTraitsCheck in the form of ( Concept::HasNumericTraits< InputImagePixelType > )

template<class TInputImage, class TOutputImage>

itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::typedef

(

Concept::HasNumericTraits< OutputImagePixelType >

)

This class requires OutputHasNumericTraitsCheck in the form of ( Concept::HasNumericTraits< OutputImagePixelType > )

template<class TInputImage, class TOutputImage>

itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::typedef

(

Concept::SameDimension< ImageDimension, OutputImageDimension >

)

This class requires SameDimensionCheck in the form of ( Concept::SameDimension< ImageDimension, OutputImageDimension > )

template<class TInputImage, class TOutputImage>

itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::typedef

(

Concept::IsFloatingPoint< InputImagePixelType >

)

This class requires InputIsFloatingPointCheck in the form of ( Concept::IsFloatingPoint< InputImagePixelType > )

template<class TInputImage, class TOutputImage>

itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::typedef

(

Concept::IsFloatingPoint< OutputImagePixelType >

)

This class requires OutputIsFloatingPointCheck in the form of ( Concept::IsFloatingPoint< OutputImagePixelType > )

---

Member Data Documentation

template<class TInputImage, class TOutputImage>

const unsigned int itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ImageDimension = TInputImage::ImageDimension

static

ImageDimension constant

Definition at line 134 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

SizeValueType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_Center

private

Definition at line 349 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

DerivativeOperator< OutputImagePixelType, itkGetStaticConstMacro(ImageDimension) > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_ComputeCannyEdge1stDerivativeOper

private

Function objects that are used in the inner loops of derivatiVex calculations.

Definition at line 341 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

DerivativeOperator< OutputImagePixelType, itkGetStaticConstMacro(ImageDimension) > itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_ComputeCannyEdge2ndDerivativeOper

private

Function objects that are used in the inner loops of derivatiVex calculations.

Definition at line 343 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

std::slice itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_ComputeCannyEdgeSlice[ImageDimension]

private

Definition at line 346 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

GaussianImageFilterType::Pointer itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_GaussianFilter

private

Gaussian filter to smooth the input image

Definition at line 332 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

OutputImagePixelType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_LowerThreshold

private

Lower threshold value for identifying edges.

Definition at line 326 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

ArrayType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_MaximumError

private

The maximum error of the gaussian blurring kernel in each dimensional direction.

Definition at line 320 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

MultiplyImageFilterType::Pointer itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_MultiplyImageFilter

private

Multiply image filter to multiply with the zero crossings of the second derivative.

Definition at line 336 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

ListPointerType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_NodeList

private

Definition at line 352 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

ListNodeStorageType::Pointer itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_NodeStore

private

Definition at line 351 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

SizeValueType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_Stride[ImageDimension]

private

Definition at line 348 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

OutputImageType::Pointer itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_UpdateBuffer1

private

Update buffers used during calculation of multiple steps

Definition at line 329 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

OutputImagePixelType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_UpperThreshold

private

Upper threshold value for identifying edges.

Definition at line 323 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

ArrayType itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_Variance

private

The variance of the Gaussian Filter used in this filter

Definition at line 316 of file itkCannyEdgeDetectionImageFilter.h.

template<class TInputImage, class TOutputImage>

const unsigned int itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::OutputImageDimension = TOutputImage::ImageDimension

static

ImageDimension constant

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

Definition at line 136 of file itkCannyEdgeDetectionImageFilter.h.

---

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

• itkCannyEdgeDetectionImageFilter.h