#include <itkStatisticsOpeningLabelMapFilter.h>

Inheritance diagram for itk::StatisticsOpeningLabelMapFilter< TImage >:

Collaboration diagram for itk::StatisticsOpeningLabelMapFilter< TImage >:

Detailed Description

template<class TImage>
class itk::StatisticsOpeningLabelMapFilter< TImage >

remove the objects according to the value of their statistics attribute

StatisticsOpeningLabelMapFilter removes the objects in a lavbel collection image with an attribute value smaller or greater than a threshold called Lambda. The attributes are the ones of the StatisticsLabelObject.

Author: Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.

This implementation was taken from the Insight Journal paper: http://hdl.handle.net/1926/584 or http://www.insight-journal.org/browse/publication/176

See Also: StatisticsLabelObject, BinaryStatisticsOpeningImageFilter, LabelShapeOpeningImageFilter

Definition at line 45 of file itkStatisticsOpeningLabelMapFilter.h.

Public Types
typedef LabelObjectType::AttributeType	AttributeType

typedef SmartPointer< const Self >	ConstPointer

typedef ImageType::ConstPointer	ImageConstPointer

typedef ImageType::Pointer	ImagePointer

typedef TImage	ImageType

typedef ImageType::IndexType	IndexType

typedef ImageType::LabelObjectType	LabelObjectType

typedef ImageType::PixelType	PixelType

typedef SmartPointer< Self >	Pointer

typedef StatisticsOpeningLabelMapFilter	Self

typedef ShapeOpeningLabelMapFilter < TImage >	Superclass

Public Types inherited from itk::ShapeOpeningLabelMapFilter< TImage >
typedef LabelObjectType::AttributeType	AttributeType

typedef SmartPointer< const Self >	ConstPointer

typedef ImageType::ConstPointer	ImageConstPointer

typedef ImageType::Pointer	ImagePointer

typedef TImage	ImageType

typedef ImageType::IndexType	IndexType

typedef ImageType::LabelObjectType	LabelObjectType

typedef ImageType::PixelType	PixelType

typedef SmartPointer< Self >	Pointer

typedef ShapeOpeningLabelMapFilter	Self

typedef InPlaceLabelMapFilter < TImage >	Superclass

Public Types inherited from itk::InPlaceLabelMapFilter< TImage >
typedef SmartPointer< const Self >	ConstPointer

typedef InputImageType::IndexType	IndexType

typedef InputImageType::ConstPointer	InputImageConstPointer

typedef InputImageType::PixelType	InputImagePixelType

typedef InputImageType::Pointer	InputImagePointer

typedef InputImageType::RegionType	InputImageRegionType

typedef TImage	InputImageType

typedef InputImageType::LabelObjectType	LabelObjectType

typedef Superclass::OutputImagePixelType	OutputImagePixelType

typedef Superclass::OutputImagePointer	OutputImagePointer

typedef Superclass::OutputImageRegionType	OutputImageRegionType

typedef Superclass::OutputImageType	OutputImageType

typedef InputImageType::PixelType	PixelType

typedef SmartPointer< Self >	Pointer

typedef InputImageType::RegionType	RegionType

typedef InPlaceLabelMapFilter	Self

typedef LabelMapFilter< TImage, TImage >	Superclass

typedef TImage	TOutputImage

Public Types inherited from itk::LabelMapFilter< TImage, TImage >
typedef SmartPointer< const Self >	ConstPointer

typedef InputImageType::ConstPointer	InputImageConstPointer

typedef InputImageType::PixelType	InputImagePixelType

typedef InputImageType::Pointer	InputImagePointer

typedef InputImageType::RegionType	InputImageRegionType

typedef TImage	InputImageType

typedef InputImageType::LabelObjectType	LabelObjectType

typedef OutputImageType::ConstPointer	OutputImageConstPointer

typedef OutputImageType::PixelType	OutputImagePixelType

typedef OutputImageType::Pointer	OutputImagePointer

typedef OutputImageType::RegionType	OutputImageRegionType

typedef TImage	OutputImageType

typedef SmartPointer< Self >	Pointer

typedef LabelMapFilter	Self

typedef ImageToImageFilter < TImage, TImage >	Superclass

Public Types inherited from itk::ImageToImageFilter< TImage, TImage >
typedef SmartPointer< const Self >	ConstPointer

typedef InputImageType::ConstPointer	InputImageConstPointer

typedef InputImageType::PixelType	InputImagePixelType

typedef InputImageType::Pointer	InputImagePointer

typedef InputImageType::RegionType	InputImageRegionType

typedef TImage	InputImageType

typedef Superclass::OutputImagePixelType	OutputImagePixelType

typedef Superclass::OutputImageRegionType	OutputImageRegionType

typedef SmartPointer< Self >	Pointer

typedef ImageToImageFilter	Self

typedef ImageSource< TImage >	Superclass

Public Types inherited from itk::ImageSource< TImage >
typedef SmartPointer< const Self >	ConstPointer

typedef Superclass::DataObjectIdentifierType	DataObjectIdentifierType

typedef DataObject::Pointer	DataObjectPointer

typedef Superclass::DataObjectPointerArraySizeType	DataObjectPointerArraySizeType

typedef OutputImageType::PixelType	OutputImagePixelType

typedef OutputImageType::Pointer	OutputImagePointer

typedef OutputImageType::RegionType	OutputImageRegionType

typedef TImage	OutputImageType

typedef SmartPointer< Self >	Pointer

typedef ImageSource	Self

typedef ProcessObject	Superclass

Public Types inherited from itk::ProcessObject
typedef SmartPointer< const Self >	ConstPointer

typedef DataObject::DataObjectIdentifierType	DataObjectIdentifierType

typedef DataObject::Pointer	DataObjectPointer

typedef std::vector < DataObjectPointer >	DataObjectPointerArray

typedef DataObjectPointerArray::size_type	DataObjectPointerArraySizeType

typedef std::vector < DataObjectIdentifierType >	NameArray

typedef SmartPointer< Self >	Pointer

typedef ProcessObject	Self

typedef Object	Superclass

Public Types inherited from itk::Object
typedef SmartPointer< const Self >	ConstPointer

typedef SmartPointer< Self >	Pointer

typedef Object	Self

typedef LightObject	Superclass

Public Types inherited from itk::LightObject
typedef SmartPointer< const Self >	ConstPointer

typedef SmartPointer< Self >	Pointer

typedef LightObject	Self

Public Member Functions
virtual ::itk::LightObject::Pointer	CreateAnother (void) const

virtual const char *	GetNameOfClass () const

Public Member Functions inherited from itk::ShapeOpeningLabelMapFilter< TImage >
virtual double	GetLambda () const

virtual void	SetLambda (double _arg)

virtual bool	GetReverseOrdering () const

virtual void	SetReverseOrdering (bool _arg)

virtual void	ReverseOrderingOn ()

virtual void	ReverseOrderingOff ()

virtual AttributeType	GetAttribute () const

virtual void	SetAttribute (AttributeType _arg)

void	SetAttribute (const std::string &s)

Public Member Functions inherited from itk::InPlaceLabelMapFilter< TImage >
bool	CanRunInPlace () const

virtual ::itk::LightObject::Pointer	CreateAnother (void) const

virtual void	SetInPlace (bool _arg)

virtual bool	GetInPlace ()

virtual void	InPlaceOn ()

virtual void	InPlaceOff ()

Public Member Functions inherited from itk::LabelMapFilter< TImage, TImage >
virtual ::itk::LightObject::Pointer	CreateAnother (void) const

void	EnlargeOutputRequestedRegion (DataObject *)

void	GenerateInputRequestedRegion ()

Public Member Functions inherited from itk::ImageToImageFilter< TImage, TImage >
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 TImage *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< TImage >
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 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 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

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 Member Functions inherited from itk::ShapeOpeningLabelMapFilter< TImage >
static Pointer	New ()

Static Public Member Functions inherited from itk::InPlaceLabelMapFilter< TImage >
static Pointer	New ()

Static Public Member Functions inherited from itk::LabelMapFilter< TImage, TImage >
static Pointer	New ()

Static Public Attributes
static const unsigned int	ImageDimension = TImage::ImageDimension

Static Public Attributes inherited from itk::ShapeOpeningLabelMapFilter< TImage >
static const unsigned int	ImageDimension = TImage::ImageDimension

Static Public Attributes inherited from itk::InPlaceLabelMapFilter< TImage >
static const unsigned int	InputImageDimension

static const unsigned int	OutputImageDimension

Static Public Attributes inherited from itk::LabelMapFilter< TImage, TImage >
static const unsigned int	InputImageDimension

static const unsigned int	OutputImageDimension

Static Public Attributes inherited from itk::ImageToImageFilter< TImage, TImage >
static const unsigned int	InputImageDimension

static const unsigned int	OutputImageDimension

Static Public Attributes inherited from itk::ImageSource< TImage >
static const unsigned int	OutputImageDimension

Protected Member Functions
void	GenerateData ()

	StatisticsOpeningLabelMapFilter ()

	~StatisticsOpeningLabelMapFilter ()

Protected Member Functions inherited from itk::ShapeOpeningLabelMapFilter< TImage >
void	PrintSelf (std::ostream &os, Indent indent) const

	ShapeOpeningLabelMapFilter ()

template<class TAttributeAccessor >
void	TemplatedGenerateData (const TAttributeAccessor &accessor)

	~ShapeOpeningLabelMapFilter ()

Protected Member Functions inherited from itk::InPlaceLabelMapFilter< TImage >
virtual void	AllocateOutputs ()

virtual InputImageType *	GetLabelMap ()

	InPlaceLabelMapFilter ()

	~InPlaceLabelMapFilter ()

Protected Member Functions inherited from itk::LabelMapFilter< TImage, TImage >
virtual void	AfterThreadedGenerateData ()

virtual void	BeforeThreadedGenerateData ()

	LabelMapFilter ()

virtual void	ThreadedGenerateData (const OutputImageRegionType &outputRegionForThread, ThreadIdType threadId)

virtual void	ThreadedProcessLabelObject (LabelObjectType *labelObject)

	~LabelMapFilter ()

Protected Member Functions inherited from itk::ImageToImageFilter< TImage, TImage >
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< TImage >
virtual const ImageRegionSplitterBase *	GetImageRegionSplitter (void) const

	ImageSource ()

virtual unsigned int	SplitRequestedRegion (unsigned int i, unsigned int num, OutputImageRegionType &splitRegion)

virtual	~ImageSource ()

Protected Member Functions inherited from itk::ProcessObject
virtual void	AddInput (DataObject *input)

virtual void	AddOutput (DataObject *output)

virtual void	CacheInputReleaseDataFlags ()

virtual void	GenerateOutputInformation ()

virtual void	GenerateOutputRequestedRegion (DataObject *output)

virtual const DataObjectPointerArraySizeType &	GetNumberOfRequiredOutputs ()

bool	IsIndexedInputName (const DataObjectIdentifierType &) const

bool	IsIndexedOutputName (const DataObjectIdentifierType &) const

	itkLegacyMacro (virtual void RemoveOutput(DataObject *output))

	itkLegacyMacro (void SetNumberOfOutputs(DataObjectPointerArraySizeType num))

	itkLegacyMacro (virtual void RemoveInput(DataObject *input))

	itkLegacyMacro (void SetNumberOfInputs(DataObjectPointerArraySizeType num))

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	ReleaseInputs ()

virtual void	RemoveInput (const DataObjectIdentifierType &key)

virtual void	RemoveInput (DataObjectPointerArraySizeType)

virtual void	RemoveOutput (const DataObjectIdentifierType &key)

virtual void	RemoveOutput (DataObjectPointerArraySizeType idx)

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	SetNumberOfRequiredOutputs (DataObjectPointerArraySizeType _arg)

virtual void	SetOutput (const DataObjectIdentifierType &key, DataObject *output)

virtual void	SetPrimaryInput (DataObject *input)

virtual void	SetPrimaryOutput (DataObject *output)

virtual void	VerifyPreconditions ()

	~ProcessObject ()

DataObject *	GetInput (const DataObjectIdentifierType &key)

const DataObject *	GetInput (const DataObjectIdentifierType &key) const

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 (void) const

virtual void	SetNumberOfRequiredInputs (DataObjectPointerArraySizeType)

virtual const DataObjectPointerArraySizeType &	GetNumberOfRequiredInputs ()

bool	AddRequiredInputName (const DataObjectIdentifierType &)

bool	AddRequiredInputName (const DataObjectIdentifierType &, DataObjectPointerArraySizeType idx)

bool	RemoveRequiredInputName (const DataObjectIdentifierType &)

bool	IsRequiredInputName (const DataObjectIdentifierType &) const

void	SetRequiredInputNames (const NameArray &)

DataObject *	GetOutput (const DataObjectIdentifierType &key)

const DataObject *	GetOutput (const DataObjectIdentifierType &key) const

virtual void	SetPrimaryOutputName (const DataObjectIdentifierType &key)

virtual const char *	GetPrimaryOutputName (void) 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	operator= (const Self &)

	StatisticsOpeningLabelMapFilter (const Self &)

Additional Inherited Members
Protected Types inherited from itk::ImageToImageFilter< TImage, TImage >
typedef ImageToImageFilterDetail::ImageRegionCopier < itkGetStaticConstMacro(OutputImageDimension), itkGetStaticConstMacro(InputImageDimension) >	InputToOutputRegionCopierType

typedef ImageToImageFilterDetail::ImageRegionCopier < itkGetStaticConstMacro(InputImageDimension), itkGetStaticConstMacro(OutputImageDimension) >	OutputToInputRegionCopierType

Static Protected Member Functions inherited from itk::ImageSource< TImage >
static const ImageRegionSplitterBase *	GetGlobalDefaultSplitter ()

static ITK_THREAD_RETURN_TYPE	ThreaderCallback (void *arg)

Protected Attributes inherited from itk::ShapeOpeningLabelMapFilter< TImage >
AttributeType	m_Attribute

double	m_Lambda

bool	m_ReverseOrdering

Member Typedef Documentation

template<class TImage >

typedef LabelObjectType::AttributeType itk::StatisticsOpeningLabelMapFilter< TImage >::AttributeType

Definition at line 63 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef SmartPointer< const Self > itk::StatisticsOpeningLabelMapFilter< TImage >::ConstPointer

Definition at line 53 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef ImageType::ConstPointer itk::StatisticsOpeningLabelMapFilter< TImage >::ImageConstPointer

Definition at line 58 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef ImageType::Pointer itk::StatisticsOpeningLabelMapFilter< TImage >::ImagePointer

Definition at line 57 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef TImage itk::StatisticsOpeningLabelMapFilter< TImage >::ImageType

Some convenient typedefs.

Definition at line 56 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef ImageType::IndexType itk::StatisticsOpeningLabelMapFilter< TImage >::IndexType

Definition at line 60 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef ImageType::LabelObjectType itk::StatisticsOpeningLabelMapFilter< TImage >::LabelObjectType

Definition at line 61 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef ImageType::PixelType itk::StatisticsOpeningLabelMapFilter< TImage >::PixelType

Definition at line 59 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef SmartPointer< Self > itk::StatisticsOpeningLabelMapFilter< TImage >::Pointer

Definition at line 52 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef StatisticsOpeningLabelMapFilter itk::StatisticsOpeningLabelMapFilter< TImage >::Self

Standard class typedefs.

Definition at line 50 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

typedef ShapeOpeningLabelMapFilter< TImage > itk::StatisticsOpeningLabelMapFilter< TImage >::Superclass

Definition at line 51 of file itkStatisticsOpeningLabelMapFilter.h.

Constructor & Destructor Documentation

template<class TImage >

itk::StatisticsOpeningLabelMapFilter< TImage >::StatisticsOpeningLabelMapFilter ( )

protected

Begin concept checking End concept checking

template<class TImage >

itk::StatisticsOpeningLabelMapFilter< TImage >::~StatisticsOpeningLabelMapFilter ( )

inlineprotected

Definition at line 90 of file itkStatisticsOpeningLabelMapFilter.h.

template<class TImage >

itk::StatisticsOpeningLabelMapFilter< TImage >::StatisticsOpeningLabelMapFilter ( const Self & )

private

Member Function Documentation

template<class TImage >

virtual::itk::LightObject::Pointer itk::StatisticsOpeningLabelMapFilter< TImage >::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::ShapeOpeningLabelMapFilter< TImage >.

template<class TImage >

void itk::StatisticsOpeningLabelMapFilter< TImage >::GenerateData ( void )

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.