itk::ZeroCrossingImageFilter< TInputImage, TOutputImage > Class Template Reference
[Image Feature Extraction Filters]

#include <itkZeroCrossingImageFilter.h>

Inheritance diagram for itk::ZeroCrossingImageFilter:

[legend]Collaboration diagram for itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >:

[legend]List of all members.

Public Types
typedef ZeroCrossingImageFilter	Self
typedef ImageToImageFilter< TInputImage, TOutputImage >	Superclass
typedef TInputImage	InputImageType
typedef TOutputImage	OutputImageType
typedef SmartPointer< Self >	Pointer
typedef SmartPointer< const Self >	ConstPointer
typedef TInputImage::PixelType	InputImagePixelType
typedef TOutputImage::PixelType	OutputImagePixelType
typedef TOutputImage::RegionType	OutputImageRegionType
Public Methods
virtual const char *	GetClassName () const
	itkStaticConstMacro (ImageDimension, unsigned int, TInputImage::ImageDimension)
virtual void	GenerateInputRequestedRegion () throw (InvalidRequestedRegionError)
virtual void	SetForegroundValue (OutputImagePixelType _arg)
virtual OutputImagePixelType	GetForegroundValue ()
virtual void	SetBackgroundValue (OutputImagePixelType _arg)
virtual OutputImagePixelType	GetBackgroundValue ()
Static Public Methods
Pointer	New ()
Protected Methods
	ZeroCrossingImageFilter ()
	~ZeroCrossingImageFilter ()
void	PrintSelf (std::ostream &os, Indent indent) const
	ZeroCrossingImageFilter (const Self &)
void	ThreadedGenerateData (const OutputImageRegionType &outputRegionForThread, int threadId)
Protected Attributes
OutputImagePixelType	m_BackgroundValue
OutputImagePixelType	m_ForegroundValue

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Detailed Description

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

This filter finds the closest pixel to the zero-crossings (sign changes) in a signed itk::Image. Pixels closest to zero-crossings are labeled with a foreground value. All other pixels are marked with a background value. The algorithm works by detecting differences in sign among neighbors using city-block style connectivity (4-neighbors in 2d, 6-neighbors in 3d, etc.).

Inputs and Outputs

The input to this filter is an itk::Image of arbitrary dimension. The algorithm assumes a signed data type (zero-crossings are not defined for unsigned data types), and requires that operator>, operator<, operator==, and operator!= are defined.

The output of the filter is a binary, labeled image of user-specified type. By default, zero-crossing pixels are labeled with a default ``foreground'' value of itk::NumericTraits<OutputDataType>One, where OutputDataType is the data type of the output image. All other pixels are labeled with a default ``background'' value of itk::NumericTraits<OutputDataType>Zero.

Parameters

There are two parameters for this filter. ForegroundValue is the value that marks zero-crossing pixels. The BackgroundValue is the value given to all other pixels.

See also:

Image , Neighborhood , NeighborhoodOperator , NeighborhoodIterator

Definition at line 56 of file itkZeroCrossingImageFilter.h.

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Member Typedef Documentation

template<class TInputImage, class TOutputImage> typedef SmartPointer<const Self> itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::ConstPointer

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >. Definition at line 70 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef TInputImage::PixelType itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::InputImagePixelType

Define pixel types Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >. Definition at line 73 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef TInputImage itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::InputImageType

Image typedef support Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >. Definition at line 65 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef TOutputImage::PixelType itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::OutputImagePixelType

Reimplemented from itk::ImageSource< TOutputImage >. Definition at line 74 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef TOutputImage::RegionType itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::OutputImageRegionType

Typedef to describe the output image region type. Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >. Definition at line 80 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef TOutputImage itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::OutputImageType

Some convenient typedefs. Reimplemented from itk::ImageSource< TOutputImage >. Definition at line 66 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef SmartPointer<Self> itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::Pointer

SmartPointer typedef support Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >. Definition at line 69 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef ZeroCrossingImageFilter itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::Self

Standard "Self" & Superclass typedef. Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >. Definition at line 61 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> typedef ImageToImageFilter<TInputImage, TOutputImage> itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::Superclass

Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >. Definition at line 62 of file itkZeroCrossingImageFilter.h.

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Constructor & Destructor Documentation

template<class TInputImage, class TOutputImage> itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::ZeroCrossingImageFilter (    )  [inline, protected]

Definition at line 110 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::~ZeroCrossingImageFilter (    )  [inline, protected]

Definition at line 115 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::ZeroCrossingImageFilter (  const Self &    )  [inline, protected]

Definition at line 118 of file itkZeroCrossingImageFilter.h.

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Member Function Documentation

template<class TInputImage, class TOutputImage> virtual void itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::GenerateInputRequestedRegion (    )  throw (InvalidRequestedRegionError) [virtual]

ZeroCrossingImageFilter needs a larger input requested region than the output requested region (larger by the kernel size to do comparisons between the central pixel and ite neighbors). Thus ZeroCrossingImageFilter 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::ZeroCrossingImageFilter< TInputImage, TOutputImage >::GetBackgroundValue (    )  [virtual]

Set/Get the label value for non-zero-crossing pixels.

template<class TInputImage, class TOutputImage> virtual const char* itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::GetClassName (    )  const [virtual]

Run-time type information (and related methods). Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage> virtual OutputImagePixelType itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::GetForegroundValue (    )  [virtual]

Set/Get the label value for zero-crossing pixels.

template<class TInputImage, class TOutputImage> itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::itkStaticConstMacro (  ImageDimension   , unsigned    int, TInputImage::ImageDimension    )

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

template<class TInputImage, class TOutputImage> Pointer itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::New (    )  [static]

Method for creation through the object factory. Reimplemented from itk::ImageToImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage> void itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::PrintSelf (  std::ostream &    os, Indent    indent )  const [protected, virtual]

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 >.

template<class TInputImage, class TOutputImage> virtual void itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::SetBackgroundValue (  OutputImagePixelType    _arg )  [virtual]

Set/Get the label value for non-zero-crossing pixels.

template<class TInputImage, class TOutputImage> virtual void itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::SetForegroundValue (  OutputImagePixelType    _arg )  [virtual]

Set/Get the label value for zero-crossing pixels.

template<class TInputImage, class TOutputImage> void itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::ThreadedGenerateData (  const OutputImageRegionType &    outputRegionForThread, int    threadId )  [protected, virtual]

ZeroCrossingImageFilter can be implemented as a multithreaded filter. Therefore,this implementation provides a ThreadedGenerateData() routine which is called for each processing thread. The output image data is allocated automatically by the superclass prior to calling ThreadedGenerateData(). ThreadedGenerateData can only write to the portion of the output image specified by the parameter "outputRegionForThread" See also: ImageToImageFilter::ThreadedGenerateData(), ImageToImageFilter::GenerateData() Reimplemented from itk::ImageSource< TOutputImage >.

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Member Data Documentation

template<class TInputImage, class TOutputImage> OutputImagePixelType itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::m_BackgroundValue [protected]

Definition at line 119 of file itkZeroCrossingImageFilter.h.

template<class TInputImage, class TOutputImage> OutputImagePixelType itk::ZeroCrossingImageFilter< TInputImage, TOutputImage >::m_ForegroundValue [protected]

Definition at line 120 of file itkZeroCrossingImageFilter.h.

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

• itkZeroCrossingImageFilter.h

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