Computes the threshold required to separate an object or patient in the foreground of an image from a dark background. More...

Inheritance diagram for itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >:

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Collaboration diagram for itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >:

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Public Types
typedef ForegroundFromBackgroundImageThresholdCalculator	Self

typedef Object	Superclass

typedef SmartPointer< Self >	Pointer

typedef SmartPointer< const Self >	ConstPointer

typedef TInputImage	ImageType

typedef TInputImage::Pointer	ImagePointer

typedef TInputImage::ConstPointer	ImageConstPointer

typedef TInputImage::PixelType	PixelType

typedef TInputImage::IndexType	IndexType

typedef TInputImage::RegionType	RegionType

typedef itk::Statistics::ImageToHistogramFilter < TInputImage >	ImageToHistogramFilterType

typedef ImageToHistogramFilterType::HistogramType	HistogramType

typedef itk::Array< double >	ArrayType

Public Member Functions
virtual const char *	GetClassName () const

virtual void	SetImage (const ImageType *_arg)

void	Compute (void) throw (ExceptionObject)

virtual PixelType	GetThreshold () const

void	SetRegion (const RegionType &region)

void	SetVerbose (bool flag)

void	SetVerboseOn (void)

void	SetVerboseOff (void)

Static Public Member Functions
static Pointer	New ()

Protected Member Functions
	ForegroundFromBackgroundImageThresholdCalculator ()

virtual	~ForegroundFromBackgroundImageThresholdCalculator ()

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

void	WriteHistogramToTextFile (std::string fileName, HistogramType *histogram)

void	WriteDataToTextFile (std::string fileName, itk::Array< double > x, itk::Array< double > y)

void	Normalise (itk::Array< double > *y)

void	ComputeVariances (int iStart, int iInc, unsigned int nIntensities, PixelType firstIntensity)

Protected Attributes
bool	m_FlgVerbose

PixelType	m_Threshold

ImageConstPointer	m_Image

RegionType	m_Region

bool	m_RegionSetByUser

Detailed Description

template<class TInputImage>
class itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >

Computes the threshold required to separate an object or patient in the foreground of an image from a dark background.

This calculator computes a threshold to separate an object (i.e. the patient) from the background using the following criteria:

Intensities below this threshold have a lower variance than intensities above it.
The backgound is dark therefore the threshold will be close to zero.
The number of voxels below this threshold is large compared to the number of voxels at intensity levels in the foreground.

The threshold is therefore equal to:

( MaxIntensity - t )*( CDF( t ) - Variance( t )/Max_Variance )

where:

CDF( t ) is the cummulative distribution of intensities below t

Variance( t ) is the variance of intensities below t.

Member Typedef Documentation

template<class TInputImage >

typedef itk::Array< double > itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ArrayType

Type definition for the arrays used

template<class TInputImage >

typedef SmartPointer< const Self > itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ConstPointer

template<class TInputImage >

typedef ImageToHistogramFilterType::HistogramType itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::HistogramType

Type definition for the image histogram.

template<class TInputImage >

typedef TInputImage::ConstPointer itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ImageConstPointer

Const Pointer type for the image.

template<class TInputImage >

typedef TInputImage::Pointer itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ImagePointer

Pointer type for the image.

template<class TInputImage >

typedef itk::Statistics::ImageToHistogramFilter< TInputImage > itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ImageToHistogramFilterType

Type definition for the image histogram.

template<class TInputImage >

typedef TInputImage itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ImageType

Type definition for the input image.

template<class TInputImage >

typedef TInputImage::IndexType itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::IndexType

Type definition for the input image index type.

template<class TInputImage >

typedef TInputImage::PixelType itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::PixelType

Type definition for the input image pixel type.

template<class TInputImage >

typedef SmartPointer< Self > itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::Pointer

template<class TInputImage >

typedef TInputImage::RegionType itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::RegionType

Type definition for the input image region type.

template<class TInputImage >

typedef ForegroundFromBackgroundImageThresholdCalculator itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::Self

Standard class typedefs.

template<class TInputImage >

typedef Object itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::Superclass

Constructor & Destructor Documentation

template<class TInputImage >

itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ForegroundFromBackgroundImageThresholdCalculator ( )

protected

template<class TInputImage >

virtual itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::~ForegroundFromBackgroundImageThresholdCalculator ( )

inlineprotectedvirtual

Member Function Documentation

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::Compute	(	void	)
throw	(	ExceptionObject
	)

Compute the threshold to separate the forground from the background.

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::ComputeVariances	(	int	iStart,
		int	iInc,
		unsigned int	nIntensities,
		PixelType	firstIntensity
	)

protected

template<class TInputImage >

virtual const char* itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::GetClassName ( ) const

virtual

Run-time type information (and related methods).

template<class TInputImage >

virtual PixelType itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::GetThreshold ( ) const

virtual

Return the threshold intensity value.

template<class TInputImage >

static Pointer itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::New ( )

static

Method for creation through the object factory.

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::Normalise ( itk::Array< double > * y )

protected

template<class TInputImage >

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

overrideprotected

template<class TInputImage >

virtual void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::SetImage ( const ImageType * _arg )

virtual

Set the input image.

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::SetRegion ( const RegionType & region )

Set the region over which the values will be computed

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::SetVerbose ( bool flag )

inline

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::SetVerboseOff ( void )

inline

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::SetVerboseOn ( void )

inline

template<class TInputImage >

void itk::ForegroundFromBackgroundImageThresholdCalculator< TInputImage >::WriteDataToTextFile	(	std::string	fileName,
		itk::Array< double > *	x,
		itk::Array< double > *	y
	)