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

#include <itkCannyEdgeDetectionImageFilter.h>

Detailed Description

template<typename TInputImage, typename 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

Examples

Examples/Filtering/CannyEdgeDetectionImageFilter.cxx, and SphinxExamples/src/Filtering/ImageFeature/DetectEdgesWithCannyEdgeDetectionFilter/Code.cxx.

Definition at line 88 of file itkCannyEdgeDetectionImageFilter.h.

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

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

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

Public Member Functions
virtual OutputImagePixelType	GetLowerThreshold () const
const char *	GetNameOfClass () const override
OutputImageType *	GetNonMaximumSuppressionImage ()
virtual OutputImagePixelType	GetUpperThreshold () const
virtual void	SetLowerThreshold (OutputImagePixelType _arg)
virtual void	SetUpperThreshold (OutputImagePixelType _arg)
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 () const
const InputImageType *	GetInput (unsigned int idx) const
void	PopBackInput () override
void	PopFrontInput () override
virtual void	PushBackInput (const InputImageType *input)
virtual void	PushFrontInput (const InputImageType *input)
virtual void	SetInput (const DataObjectIdentifierType &key, DataObject *input)
virtual void	SetInput (const InputImageType *input)
virtual void	SetInput (unsigned int, const TInputImage *image)
virtual void	SetCoordinateTolerance (double _arg)
virtual double	GetCoordinateTolerance () const
virtual void	SetDirectionTolerance (double _arg)
virtual double	GetDirectionTolerance () const
Public Member Functions inherited from itk::ImageSource< TOutputImage >
OutputImageType *	GetOutput (unsigned int idx)
OutputImageType *	GetOutput ()
const OutputImageType *	GetOutput () const
virtual void	GraftOutput (DataObject *graft)
virtual void	GraftOutput (const DataObjectIdentifierType &key, DataObject *graft)
virtual void	GraftNthOutput (unsigned int idx, DataObject *graft)
ProcessObject::DataObjectPointer	MakeOutput (ProcessObject::DataObjectPointerArraySizeType idx) override
ProcessObject::DataObjectPointer	MakeOutput (const ProcessObject::DataObjectIdentifierType &) override
Public Member Functions inherited from itk::ProcessObject
virtual void	AbortGenerateDataOn ()
virtual void	EnlargeOutputRequestedRegion (DataObject *)
virtual const bool &	GetAbortGenerateData () const
DataObjectPointerArray	GetIndexedInputs ()
DataObjectPointerArray	GetIndexedOutputs ()
NameArray	GetInputNames () const
DataObjectPointerArray	GetInputs ()
MultiThreaderType *	GetMultiThreader () const
DataObjectPointerArraySizeType	GetNumberOfIndexedInputs () const
DataObjectPointerArraySizeType	GetNumberOfIndexedOutputs () const
DataObjectPointerArraySizeType	GetNumberOfInputs () const
DataObjectPointerArraySizeType	GetNumberOfOutputs () const
virtual DataObjectPointerArraySizeType	GetNumberOfValidRequiredInputs () const
NameArray	GetOutputNames () const
DataObjectPointerArray	GetOutputs ()
virtual float	GetProgress () const
NameArray	GetRequiredInputNames () const
bool	HasInput (const DataObjectIdentifierType &key) const
bool	HasOutput (const DataObjectIdentifierType &key) const
void	IncrementProgress (float increment)
virtual void	PrepareOutputs ()
virtual void	PropagateRequestedRegion (DataObject *output)
virtual void	ResetPipeline ()
virtual void	SetAbortGenerateData (bool _arg)
void	SetMultiThreader (MultiThreaderType *threader)
virtual void	Update ()
virtual void	UpdateLargestPossibleRegion ()
virtual void	UpdateOutputData (DataObject *output)
virtual void	UpdateOutputInformation ()
void	UpdateProgress (float progress)
virtual void	SetReleaseDataFlag (bool val)
virtual bool	GetReleaseDataFlag () const
void	ReleaseDataFlagOn ()
void	ReleaseDataFlagOff ()
virtual void	SetReleaseDataBeforeUpdateFlag (bool _arg)
virtual const bool &	GetReleaseDataBeforeUpdateFlag () const
virtual void	ReleaseDataBeforeUpdateFlagOn ()
virtual void	SetNumberOfWorkUnits (ThreadIdType _arg)
virtual const ThreadIdType &	GetNumberOfWorkUnits () const
Public Member Functions inherited from itk::Object
unsigned long	AddObserver (const EventObject &event, Command *cmd) const
unsigned long	AddObserver (const EventObject &event, std::function< void(const EventObject &)> function) const
LightObject::Pointer	CreateAnother () const override
virtual void	DebugOff () const
virtual void	DebugOn () const
Command *	GetCommand (unsigned long tag)
bool	GetDebug () const
MetaDataDictionary &	GetMetaDataDictionary ()
const MetaDataDictionary &	GetMetaDataDictionary () const
virtual ModifiedTimeType	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
void	Register () const override
void	RemoveAllObservers ()
void	RemoveObserver (unsigned long tag) const
void	SetDebug (bool debugFlag) const
void	SetReferenceCount (int) override
void	UnRegister () const noexcept override
void	SetMetaDataDictionary (const MetaDataDictionary &rhs)
void	SetMetaDataDictionary (MetaDataDictionary &&rrhs)
virtual void	SetObjectName (std::string _arg)
virtual const std::string &	GetObjectName () const
Public Member Functions inherited from itk::LightObject
Pointer	Clone () const
virtual void	Delete ()
virtual int	GetReferenceCount () const
void	Print (std::ostream &os, Indent indent=0) const

Static Public Member Functions
static Pointer	New ()
Static Public Member Functions inherited from itk::ImageToImageFilter< TInputImage, TOutputImage >
static double	GetGlobalDefaultCoordinateTolerance ()
static double	GetGlobalDefaultDirectionTolerance ()
static void	SetGlobalDefaultCoordinateTolerance (double)
static void	SetGlobalDefaultDirectionTolerance (double)
Static Public Member Functions inherited from itk::Object
static bool	GetGlobalWarningDisplay ()
static void	GlobalWarningDisplayOff ()
static void	GlobalWarningDisplayOn ()
static Pointer	New ()
static void	SetGlobalWarningDisplay (bool val)
Static Public Member Functions inherited from itk::LightObject
static void	BreakOnError ()
static Pointer	New ()

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

Protected Types
using	GaussianImageFilterType = DiscreteGaussianImageFilter< InputImageType, OutputImageType >
using	MultiplyImageFilterType = MultiplyImageFilter< OutputImageType, OutputImageType, OutputImageType >
Protected Types inherited from itk::ImageToImageFilter< TInputImage, TOutputImage >
using	InputToOutputRegionCopierType = ImageToImageFilterDetail::ImageRegionCopier< Self::OutputImageDimension, Self::InputImageDimension >
using	OutputToInputRegionCopierType = ImageToImageFilterDetail::ImageRegionCopier< Self::InputImageDimension, Self::OutputImageDimension >

Protected Member Functions
	CannyEdgeDetectionImageFilter ()
void	GenerateData () override
void	PrintSelf (std::ostream &os, Indent indent) const override
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)
void	GenerateInputRequestedRegion () override
	ImageToImageFilter ()
void	VerifyInputInformation () const override
	~ImageToImageFilter () override=default
virtual void	PushBackInput (const DataObject *input)
virtual void	PushFrontInput (const DataObject *input)
Protected Member Functions inherited from itk::ImageSource< TOutputImage >
virtual void	AfterThreadedGenerateData ()
virtual void	AllocateOutputs ()
virtual void	BeforeThreadedGenerateData ()
void	ClassicMultiThread (ThreadFunctionType callbackFunction)
virtual const ImageRegionSplitterBase *	GetImageRegionSplitter () const
	ImageSource ()
virtual unsigned int	SplitRequestedRegion (unsigned int i, unsigned int pieces, OutputImageRegionType &splitRegion)
	~ImageSource () override=default
virtual void	ThreadedGenerateData (const OutputImageRegionType &region, ThreadIdType threadId)
virtual void	DynamicThreadedGenerateData (const OutputImageRegionType &outputRegionForThread)
virtual bool	GetDynamicMultiThreading () const
virtual void	SetDynamicMultiThreading (bool _arg)
virtual void	DynamicMultiThreadingOn ()
Protected Member Functions inherited from itk::ProcessObject
virtual void	AddInput (DataObject *input)
void	AddOptionalInputName (const DataObjectIdentifierType &)
void	AddOptionalInputName (const DataObjectIdentifierType &, DataObjectPointerArraySizeType idx)
virtual void	AddOutput (DataObject *output)
bool	AddRequiredInputName (const DataObjectIdentifierType &)
bool	AddRequiredInputName (const DataObjectIdentifierType &, DataObjectPointerArraySizeType idx)
virtual void	CacheInputReleaseDataFlags ()
virtual void	GenerateOutputInformation ()
virtual void	GenerateOutputRequestedRegion (DataObject *output)
DataObject *	GetInput (const DataObjectIdentifierType &key)
const DataObject *	GetInput (const DataObjectIdentifierType &key) const
virtual const DataObjectPointerArraySizeType &	GetNumberOfRequiredInputs () const
virtual const DataObjectPointerArraySizeType &	GetNumberOfRequiredOutputs () const
bool	IsIndexedInputName (const DataObjectIdentifierType &) const
bool	IsIndexedOutputName (const DataObjectIdentifierType &) const
bool	IsRequiredInputName (const DataObjectIdentifierType &) const
DataObjectPointerArraySizeType	MakeIndexFromInputName (const DataObjectIdentifierType &name) const
DataObjectPointerArraySizeType	MakeIndexFromOutputName (const DataObjectIdentifierType &name) const
DataObjectIdentifierType	MakeNameFromInputIndex (DataObjectPointerArraySizeType idx) const
DataObjectIdentifierType	MakeNameFromOutputIndex (DataObjectPointerArraySizeType idx) const
	ProcessObject ()
virtual void	PropagateResetPipeline ()
virtual void	PushBackInput (const DataObject *input)
virtual void	PushFrontInput (const DataObject *input)
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 idx, DataObject *input)
virtual void	SetNthOutput (DataObjectPointerArraySizeType idx, DataObject *output)
void	SetNumberOfIndexedInputs (DataObjectPointerArraySizeType num)
void	SetNumberOfIndexedOutputs (DataObjectPointerArraySizeType num)
virtual void	SetNumberOfRequiredInputs (DataObjectPointerArraySizeType)
virtual void	SetNumberOfRequiredOutputs (DataObjectPointerArraySizeType _arg)
virtual void	SetOutput (const DataObjectIdentifierType &name, DataObject *output)
virtual void	SetPrimaryInput (DataObject *object)
virtual void	SetPrimaryOutput (DataObject *object)
void	SetRequiredInputNames (const NameArray &)
virtual void	VerifyPreconditions () const
	~ProcessObject () override
DataObject *	GetInput (DataObjectPointerArraySizeType idx)
const DataObject *	GetInput (DataObjectPointerArraySizeType idx) const
DataObject *	GetPrimaryInput ()
const DataObject *	GetPrimaryInput () const
virtual void	SetPrimaryInputName (const DataObjectIdentifierType &key)
virtual const char *	GetPrimaryInputName () const
DataObject *	GetOutput (const DataObjectIdentifierType &key)
const DataObject *	GetOutput (const DataObjectIdentifierType &key) const
virtual void	SetPrimaryOutputName (const DataObjectIdentifierType &key)
virtual const char *	GetPrimaryOutputName () const
DataObject *	GetOutput (DataObjectPointerArraySizeType i)
const DataObject *	GetOutput (DataObjectPointerArraySizeType i) const
DataObject *	GetPrimaryOutput ()
const DataObject *	GetPrimaryOutput () const
virtual bool	GetThreaderUpdateProgress () const
virtual void	ThreaderUpdateProgressOn ()
virtual void	SetThreaderUpdateProgress (bool arg)
Protected Member Functions inherited from itk::Object
	Object ()
bool	PrintObservers (std::ostream &os, Indent indent) const
virtual void	SetTimeStamp (const TimeStamp &timeStamp)
	~Object () override
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 ()
OutputImagePixelType	ComputeCannyEdge (const NeighborhoodType &it, void *globalData)
void	FollowEdge (IndexType index, const OutputImageType *multiplyImageFilterOutput)
void	HysteresisThresholding ()
void	ThreadedCompute2ndDerivative (const OutputImageRegionType &outputRegionForThread)
void	ThreadedCompute2ndDerivativePos (const OutputImageRegionType &outputRegionForThread)
	~CannyEdgeDetectionImageFilter () override=default

Private Attributes
SizeValueType	m_Center {}
DerivativeOperator< OutputImagePixelType, Self::ImageDimension >	m_ComputeCannyEdge1stDerivativeOper {}
DerivativeOperator< OutputImagePixelType, Self::ImageDimension >	m_ComputeCannyEdge2ndDerivativeOper {}
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 {}
OutputImageType *	m_OutputImage {}
SizeValueType	m_Stride [ImageDimension] {}
OutputImageType::Pointer	m_UpdateBuffer1 {}
OutputImagePixelType	m_UpperThreshold {}
ArrayType	m_Variance {}

Additional Inherited Members
Static Protected Member Functions inherited from itk::ImageSource< TOutputImage >
static const ImageRegionSplitterBase *	GetGlobalDefaultSplitter ()
static ITK_THREAD_RETURN_FUNCTION_CALL_CONVENTION	ThreaderCallback (void *arg)
Static Protected Member Functions inherited from itk::ProcessObject
template<typename TSourceObject >
static void	MakeRequiredOutputs (TSourceObject &sourceObject, const DataObjectPointerArraySizeType numberOfRequiredOutputs)
static constexpr float	progressFixedToFloat (uint32_t fixed)
static uint32_t	progressFloatToFixed (float f)
Protected Attributes inherited from itk::ImageSource< TOutputImage >
bool	m_DynamicMultiThreading { true }
Protected Attributes inherited from itk::ProcessObject
TimeStamp	m_OutputInformationMTime {}
bool	m_Updating {}
Protected Attributes inherited from itk::LightObject
std::atomic< int >	m_ReferenceCount {}

Member Typedef Documentation

ArrayType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ArrayType = FixedArray<double, Self::ImageDimension>

Typedef of double containers.

Definition at line 140 of file itkCannyEdgeDetectionImageFilter.h.

ConstPointer

template<typename TInputImage, typename TOutputImage>

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

Definition at line 103 of file itkCannyEdgeDetectionImageFilter.h.

DefaultBoundaryConditionType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::DefaultBoundaryConditionType = ZeroFluxNeumannBoundaryCondition<OutputImageType>

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

Definition at line 113 of file itkCannyEdgeDetectionImageFilter.h.

GaussianImageFilterType

template<typename TInputImage, typename TOutputImage>

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

protected

Definition at line 220 of file itkCannyEdgeDetectionImageFilter.h.

IndexType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::IndexType = typename TInputImage::IndexType

Definition at line 108 of file itkCannyEdgeDetectionImageFilter.h.

InputImagePixelType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::InputImagePixelType = typename TInputImage::PixelType

Define pixel types.

Definition at line 106 of file itkCannyEdgeDetectionImageFilter.h.

InputImageRegionType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::InputImageRegionType = typename TInputImage::RegionType

Definition at line 130 of file itkCannyEdgeDetectionImageFilter.h.

InputImageType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::InputImageType = TInputImage

Image type alias support

Definition at line 98 of file itkCannyEdgeDetectionImageFilter.h.

ListNodeStorageType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListNodeStorageType = ObjectStore<ListNodeType>

Definition at line 121 of file itkCannyEdgeDetectionImageFilter.h.

ListNodeType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListNodeType = ListNode<IndexType>

Definition at line 120 of file itkCannyEdgeDetectionImageFilter.h.

ListPointerType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListPointerType = typename ListType::Pointer

Definition at line 123 of file itkCannyEdgeDetectionImageFilter.h.

ListType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::ListType = SparseFieldLayer<ListNodeType>

Definition at line 122 of file itkCannyEdgeDetectionImageFilter.h.

MultiplyImageFilterType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::MultiplyImageFilterType = MultiplyImageFilter<OutputImageType, OutputImageType, OutputImageType>

protected

Definition at line 221 of file itkCannyEdgeDetectionImageFilter.h.

NeighborhoodType

template<typename TInputImage, typename TOutputImage>

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

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 118 of file itkCannyEdgeDetectionImageFilter.h.

OutputImagePixelType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::OutputImagePixelType = typename TOutputImage::PixelType

Definition at line 107 of file itkCannyEdgeDetectionImageFilter.h.

OutputImageRegionType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::OutputImageRegionType = typename TOutputImage::RegionType

Typedef to describe the output image region type.

Definition at line 129 of file itkCannyEdgeDetectionImageFilter.h.

OutputImageType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::OutputImageType = TOutputImage

Definition at line 99 of file itkCannyEdgeDetectionImageFilter.h.

Pointer

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Pointer = SmartPointer<Self>

SmartPointer type alias support

Definition at line 102 of file itkCannyEdgeDetectionImageFilter.h.

Self

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Self = CannyEdgeDetectionImageFilter

Standard "Self" & Superclass type alias.

Definition at line 94 of file itkCannyEdgeDetectionImageFilter.h.

SizeValueType

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::SizeValueType = typename TInputImage::SizeValueType

Definition at line 109 of file itkCannyEdgeDetectionImageFilter.h.

Superclass

template<typename TInputImage, typename TOutputImage>

using itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::Superclass = ImageToImageFilter<TInputImage, TOutputImage>

Definition at line 95 of file itkCannyEdgeDetectionImageFilter.h.

Constructor & Destructor Documentation

CannyEdgeDetectionImageFilter()

template<typename TInputImage, typename TOutputImage>

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

protected

~CannyEdgeDetectionImageFilter()

template<typename TInputImage, typename TOutputImage>

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

overrideprivatedefault

Member Function Documentation

AllocateUpdateBuffer()

template<typename TInputImage, typename TOutputImage>

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

private

Allocate storage for update buffers used during calculation of multiple steps.

ComputeCannyEdge()

template<typename TInputImage, typename TOutputImage>

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

private

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

FollowEdge()

template<typename TInputImage, typename TOutputImage>

void itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::FollowEdge ( IndexType  index, const OutputImageType *  multiplyImageFilterOutput  )

private

Edge linking function.

GenerateData()

template<typename TInputImage, typename TOutputImage>

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

overrideprotectedvirtual

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 DynamicThreadedGenerateData(). 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 can be threaded, it should NOT provide a GenerateData() method but should provide a DynamicThreadedGenerateData() instead.

See also

ThreadedGenerateData()

Reimplemented from itk::ImageSource< TOutputImage >.

GetLowerThreshold()

template<typename TInputImage, typename TOutputImage>

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

virtual

GetMaximumError()

template<typename TInputImage, typename TOutputImage>

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

virtual

Set/Get the maximum error of the Gaussian smoothing kernel in each dimensional direction.

GetNameOfClass()

template<typename TInputImage, typename TOutputImage>

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

overridevirtual

See also

LightObject::GetNameOfClass()

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

GetNonMaximumSuppressionImage()

template<typename TInputImage, typename TOutputImage>

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

inline

Definition at line 197 of file itkCannyEdgeDetectionImageFilter.h.

GetUpperThreshold()

template<typename TInputImage, typename TOutputImage>

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

virtual

GetVariance()

template<typename TInputImage, typename TOutputImage>

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

virtual

Set/Get the variance of the Gaussian smoothing filter.

HysteresisThresholding()

template<typename TInputImage, typename TOutputImage>

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

private

Implement hysteresis thresholding.

New()

template<typename TInputImage, typename TOutputImage>

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

static

Method for creation through the object factory.

Referenced by itk::CannySegmentationLevelSetFunction< TImageType, TFeatureImageType >::CannySegmentationLevelSetFunction().

PrintSelf()

template<typename TInputImage, typename TOutputImage>

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

overrideprotectedvirtual

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< TInputImage, TOutputImage >.

SetLowerThreshold()

template<typename TInputImage, typename TOutputImage>

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

virtual

Set the lower threshold value for detected edges.

SetMaximumError() [1/2]

template<typename TInputImage, typename TOutputImage>

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

virtual

Set/Get the maximum error of the Gaussian smoothing kernel in each dimensional direction.

SetMaximumError() [2/2]

template<typename TInputImage, typename 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 172 of file itkCannyEdgeDetectionImageFilter.h.

SetUpperThreshold()

template<typename TInputImage, typename TOutputImage>

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

virtual

Set the upper threshold value for detected edges.

SetVariance() [1/2]

template<typename TInputImage, typename TOutputImage>

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

virtual

Set/Get the variance of the Gaussian smoothing filter.

SetVariance() [2/2]

template<typename TInputImage, typename TOutputImage>

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

inline

Set/Get the variance of the Gaussian smoothing filter.

Definition at line 155 of file itkCannyEdgeDetectionImageFilter.h.

ThreadedCompute2ndDerivative()

template<typename TInputImage, typename TOutputImage>

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

private

Calculate the second derivative of the smoothed image, it writes the result to the update buffer

ThreadedCompute2ndDerivativePos()

template<typename TInputImage, typename TOutputImage>

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

private

Calculate the gradient of the second derivative of the smoothed image, it writes the result to m_UpdateBuffer1

Member Data Documentation

ImageDimension

template<typename TInputImage, typename TOutputImage>

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

staticconstexpr

ImageDimension constant.

Definition at line 136 of file itkCannyEdgeDetectionImageFilter.h.

m_Center

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 278 of file itkCannyEdgeDetectionImageFilter.h.

m_ComputeCannyEdge1stDerivativeOper

template<typename TInputImage, typename TOutputImage>

DerivativeOperator<OutputImagePixelType, Self::ImageDimension> itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_ComputeCannyEdge1stDerivativeOper {}

private

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

Definition at line 272 of file itkCannyEdgeDetectionImageFilter.h.

m_ComputeCannyEdge2ndDerivativeOper

template<typename TInputImage, typename TOutputImage>

DerivativeOperator<OutputImagePixelType, Self::ImageDimension> itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_ComputeCannyEdge2ndDerivativeOper {}

private

Definition at line 273 of file itkCannyEdgeDetectionImageFilter.h.

m_ComputeCannyEdgeSlice

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 275 of file itkCannyEdgeDetectionImageFilter.h.

m_GaussianFilter

template<typename TInputImage, typename TOutputImage>

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

private

Gaussian filter to smooth the input image.

Definition at line 264 of file itkCannyEdgeDetectionImageFilter.h.

m_LowerThreshold

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 259 of file itkCannyEdgeDetectionImageFilter.h.

m_MaximumError

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 256 of file itkCannyEdgeDetectionImageFilter.h.

m_MultiplyImageFilter

template<typename TInputImage, typename 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 268 of file itkCannyEdgeDetectionImageFilter.h.

m_NodeList

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 281 of file itkCannyEdgeDetectionImageFilter.h.

m_NodeStore

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 280 of file itkCannyEdgeDetectionImageFilter.h.

m_OutputImage

template<typename TInputImage, typename TOutputImage>

OutputImageType* itk::CannyEdgeDetectionImageFilter< TInputImage, TOutputImage >::m_OutputImage {}

private

Definition at line 283 of file itkCannyEdgeDetectionImageFilter.h.

m_Stride

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 277 of file itkCannyEdgeDetectionImageFilter.h.

m_UpdateBuffer1

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 261 of file itkCannyEdgeDetectionImageFilter.h.

m_UpperThreshold

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 258 of file itkCannyEdgeDetectionImageFilter.h.

m_Variance

template<typename TInputImage, typename TOutputImage>

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

private

Definition at line 255 of file itkCannyEdgeDetectionImageFilter.h.

OutputImageDimension

template<typename TInputImage, typename TOutputImage>

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

staticconstexpr

Definition at line 137 of file itkCannyEdgeDetectionImageFilter.h.

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

• itkCannyEdgeDetectionImageFilter.h