#include <itkOtsuMultipleThresholdsCalculator.h>

Inheritance diagram for itk::OtsuMultipleThresholdsCalculator< TInputHistogram >:

Collaboration diagram for itk::OtsuMultipleThresholdsCalculator< TInputHistogram >:

Detailed Description

template<typename TInputHistogram>
class itk::OtsuMultipleThresholdsCalculator< TInputHistogram >

Computes Otsu's multiple thresholds for a histogram.

You plug in the target histogram using SetInputHistogram method and specify the number of thresholds you want to be computed. Then call the Compute() method to run the algorithm.

The thresholds are computed so that the between-class variance is maximized.

This calculator also includes an option to use the valley emphasis algorithm from H.F. Ng, "Automatic thresholding for defect detection", Pattern Recognition Letters, (27): 1644-1649, 2006. The valley emphasis algorithm is particularly effective when the object to be thresholded is small. See the following tests for examples: itkOtsuMultipleThresholdsImageFilterTest3 and itkOtsuMultipleThresholdsImageFilterTest4 To use this algorithm, simple call the setter: SetValleyEmphasis(true) It is turned off by default.

Examples:: Filtering/OtsuMultipleThresholdImageFilter.cxx.

Definition at line 49 of file itkOtsuMultipleThresholdsCalculator.h.

Public Types
typedef SmartPointer< const Self >	ConstPointer

typedef TInputHistogram::AbsoluteFrequencyType	FrequencyType

typedef std::vector < FrequencyType >	FrequencyVectorType

typedef TInputHistogram::InstanceIdentifier	InstanceIdentifierType

typedef std::vector < InstanceIdentifierType >	InstanceIdentifierVectorType

typedef NumericTraits < MeasurementType >::RealType	MeanType

typedef std::vector< MeanType >	MeanVectorType

typedef TInputHistogram::MeasurementType	MeasurementType

typedef std::vector < MeasurementType >	OutputType

typedef SmartPointer< Self >	Pointer

typedef OtsuMultipleThresholdsCalculator	Self

typedef HistogramAlgorithmBase < TInputHistogram >	Superclass

typedef NumericTraits < MeasurementType >::RealType	VarianceType

typedef NumericTraits < MeasurementType >::RealType	WeightType

typedef std::vector< WeightType >	WeightVectorType

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

typedef TInputHistogram	InputHistogramType

typedef SmartPointer< Self >	Pointer

typedef HistogramAlgorithmBase	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
void	Compute ()

const OutputType &	GetOutput ()


virtual void	SetNumberOfThresholds (SizeValueType _arg)

virtual SizeValueType	GetNumberOfThresholds () const


virtual void	SetValleyEmphasis (bool _arg)

virtual const bool &	GetValleyEmphasis () const

virtual void	ValleyEmphasisOn ()

virtual void	ValleyEmphasisOff ()

Public Member Functions inherited from itk::HistogramAlgorithmBase< TInputHistogram >
const TInputHistogram *	GetInputHistogram () const

void	Update ()

void	SetInputHistogram (const TInputHistogram *histogram)

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 ITK_OVERRIDE

void	RemoveAllObservers ()

void	RemoveObserver (unsigned long tag)

void	SetDebug (bool debugFlag) const

void	SetMetaDataDictionary (const MetaDataDictionary &rhs)

virtual void	SetReferenceCount (int) ITK_OVERRIDE

virtual void	UnRegister () const ITK_OVERRIDE

virtual void	SetObjectName (std::string _arg)

virtual const std::string &	GetObjectName () 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

Protected Member Functions
bool	IncrementThresholds (InstanceIdentifierVectorType &thresholdIds, MeanType totalMean, MeanVectorType &classMean, FrequencyVectorType &classFrequency)

	OtsuMultipleThresholdsCalculator ()

void	PrintSelf (std::ostream &os, Indent indent) const

virtual	~OtsuMultipleThresholdsCalculator ()

Protected Member Functions inherited from itk::HistogramAlgorithmBase< TInputHistogram >
	HistogramAlgorithmBase ()

virtual	~HistogramAlgorithmBase ()

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 Attributes
SizeValueType	m_NumberOfThresholds

OutputType	m_Output

bool	m_ValleyEmphasis

virtual const char *	GetNameOfClass () const

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

static Pointer	New ()

Additional Inherited Members
Static Public Member Functions inherited from itk::Object
static bool	GetGlobalWarningDisplay ()

static void	GlobalWarningDisplayOff ()

static void	GlobalWarningDisplayOn ()

static Pointer	New ()

static void	SetGlobalWarningDisplay (bool flag)

Static Public Member Functions inherited from itk::LightObject
static void	BreakOnError ()

static Pointer	New ()

Protected Types inherited from itk::LightObject
typedef int	InternalReferenceCountType

Protected Attributes inherited from itk::LightObject
InternalReferenceCountType	m_ReferenceCount

SimpleFastMutexLock	m_ReferenceCountLock