SimpleITK  1.0.1
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itk::simple::FFTNormalizedCorrelationImageFilter Class Reference

Calculate normalized cross correlation using FFTs. More...

#include <sitkFFTNormalizedCorrelationImageFilter.h>

+ Inheritance diagram for itk::simple::FFTNormalizedCorrelationImageFilter:
+ Collaboration diagram for itk::simple::FFTNormalizedCorrelationImageFilter:

Public Types

typedef BasicPixelIDTypeList PixelIDTypeList
typedef FFTNormalizedCorrelationImageFilter Self
- Public Types inherited from itk::simple::ImageFilter< 2 >
typedef ImageFilter Self
- Public Types inherited from itk::simple::ProcessObject
typedef ProcessObject Self

Public Member Functions

Image Execute (const Image &image1, const Image &image2)
Image Execute (const Image &image1, const Image &image2, uint64_t requiredNumberOfOverlappingPixels)
 FFTNormalizedCorrelationImageFilter ()
std::string GetName () const
uint64_t GetRequiredNumberOfOverlappingPixels () const
SelfSetRequiredNumberOfOverlappingPixels (uint64_t RequiredNumberOfOverlappingPixels)
std::string ToString () const
 ~FFTNormalizedCorrelationImageFilter ()
- Public Member Functions inherited from itk::simple::ImageFilter< 2 >
 ImageFilter ()
virtual ~ImageFilter ()=0
- Public Member Functions inherited from itk::simple::ProcessObject
virtual void Abort ()
virtual int AddCommand (itk::simple::EventEnum event, itk::simple::Command &cmd)
 Add a Command Object to observer the event. More...
virtual float GetProgress () const
 An Active Measurement of the progress of execution. More...
virtual bool HasCommand (itk::simple::EventEnum event) const
 Query of this object has any registered commands for event. More...
 ProcessObject ()
virtual void RemoveAllCommands ()
 Remove all registered commands. More...
virtual ~ProcessObject ()
virtual void DebugOn ()
virtual void DebugOff ()
virtual bool GetDebug () const
virtual void SetDebug (bool debugFlag)
virtual void SetNumberOfThreads (unsigned int n)
virtual unsigned int GetNumberOfThreads () const

Private Types

typedef Image(Self::* MemberFunctionType) (const Image &image1, const Image &image2)

Private Member Functions

template<class TImageType >
Image ExecuteInternal (const Image &image1, const Image &image2)

Private Attributes

nsstd::auto_ptr< detail::MemberFunctionFactory< MemberFunctionType > > m_MemberFactory
uint64_t m_RequiredNumberOfOverlappingPixels


struct detail::MemberFunctionAddressor< MemberFunctionType >

Additional Inherited Members

- Static Public Member Functions inherited from itk::simple::ProcessObject
static bool GetGlobalDefaultDebug ()
static void GlobalDefaultDebugOff ()
static void GlobalDefaultDebugOn ()
static void SetGlobalDefaultDebug (bool debugFlag)
static void GlobalWarningDisplayOn ()
static void GlobalWarningDisplayOff ()
static void SetGlobalWarningDisplay (bool flag)
static bool GetGlobalWarningDisplay ()
static void SetGlobalDefaultNumberOfThreads (unsigned int n)
static unsigned int GetGlobalDefaultNumberOfThreads ()
static double GetGlobalDefaultCoordinateTolerance ()
 Access the global tolerance to determine congruent spaces. More...
static void SetGlobalDefaultCoordinateTolerance (double)
 Access the global tolerance to determine congruent spaces. More...
static double GetGlobalDefaultDirectionTolerance ()
 Access the global tolerance to determine congruent spaces. More...
static void SetGlobalDefaultDirectionTolerance (double)
 Access the global tolerance to determine congruent spaces. More...
- Protected Member Functions inherited from itk::simple::ProcessObject
virtual unsigned long AddITKObserver (const itk::EventObject &, itk::Command *)
virtual itk::ProcessObjectGetActiveProcess ()
virtual void OnActiveProcessDelete ()
virtual void onCommandDelete (const itk::simple::Command *cmd) throw ()
virtual void PreUpdate (itk::ProcessObject *p)
virtual void RemoveITKObserver (EventCommand &e)
- Protected Member Functions inherited from itk::simple::NonCopyable
 NonCopyable ()
- Static Protected Member Functions inherited from itk::simple::ImageFilter< 2 >
static void FixNonZeroIndex (TImageType *img)
- Static Protected Member Functions inherited from itk::simple::ProcessObject
template<class TImageType >
static TImageType::ConstPointer CastImageToITK (const Image &img)
template<class TImageType >
static Image CastITKToImage (TImageType *img)
template<class TPixelType , unsigned int VImageDimension, unsigned int VLength, template< typename, unsigned int > class TVector>
static Image CastITKToImage (itk::Image< TVector< TPixelType, VLength >, VImageDimension > *img)
static const itk::EventObjectGetITKEventObject (EventEnum e)
template<typename T >
static std::ostream & ToStringHelper (std::ostream &os, const T &v)
static std::ostream & ToStringHelper (std::ostream &os, const char &v)
static std::ostream & ToStringHelper (std::ostream &os, const signed char &v)
static std::ostream & ToStringHelper (std::ostream &os, const unsigned char &v)

Detailed Description

Calculate normalized cross correlation using FFTs.

This filter calculates the normalized cross correlation (NCC) of two images using FFTs instead of spatial correlation. It is much faster than spatial correlation for reasonably large structuring elements. This filter is a subclass of the more general MaskedFFTNormalizedCorrelationImageFilter and operates by essentially setting the masks in that algorithm to images of ones. As described in detail in the references below, there is no computational overhead to utilizing the more general masked algorithm because the FFTs of the images of ones are still necessary for the computations.

Inputs: Two images are required as inputs, fixedImage and movingImage. In the context of correlation, inputs are often defined as: "image" and "template". In this filter, the fixedImage plays the role of the image, and the movingImage plays the role of the template. However, this filter is capable of correlating any two images and is not restricted to small movingImages (templates).

Optional parameters: The RequiredNumberOfOverlappingPixels enables the user to specify how many voxels of the two images must overlap; any location in the correlation map that results from fewer than this number of voxels will be set to zero. Larger values zero-out pixels on a larger border around the correlation image. Thus, larger values remove less stable computations but also limit the capture range. If RequiredNumberOfOverlappingPixels is set to 0, the default, no zeroing will take place.

Image size: fixedImage and movingImage need not be the same size. Furthermore, whereas some algorithms require that the "template" be smaller than the "image" because of errors in the regions where the two are not fully overlapping, this filter has no such restriction.

Image spacing: Since the computations are done in the pixel domain, all input images must have the same spacing.

Outputs; The output is an image of RealPixelType that is the NCC of the two images and its values range from -1.0 to 1.0. The size of this NCC image is, by definition, size(fixedImage) + size(movingImage) - 1.

Example filter usage:

FilterType::Pointer filter = FilterType::New();
filter->SetFixedImage( fixedImage );
filter->SetMovingImage( movingImage );
The pixel type of the output image must be of real type (float or double). ConceptChecking is used to enforce the output pixel type. You will get a compilation error if the pixel type of the output image is not float or double.

References: 1) D. Padfield. "Masked object registration in the Fourier domain." Transactions on Image Processing. 2) D. Padfield. "Masked FFT registration". In Proc. Computer Vision and Pattern Recognition, 2010.

: Dirk Padfield, GE Global Research,
See also
itk::simple::FFTNormalizedCorrelation for the procedural interface
itk::FFTNormalizedCorrelationImageFilter for the Doxygen on the original ITK class.

Definition at line 75 of file sitkFFTNormalizedCorrelationImageFilter.h.

Member Typedef Documentation

typedef Image(Self::* itk::simple::FFTNormalizedCorrelationImageFilter::MemberFunctionType) (const Image &image1, const Image &image2)

Setup for member function dispatching

Definition at line 117 of file sitkFFTNormalizedCorrelationImageFilter.h.

Define the pixels types supported by this filter

Definition at line 87 of file sitkFFTNormalizedCorrelationImageFilter.h.

Definition at line 77 of file sitkFFTNormalizedCorrelationImageFilter.h.

Constructor & Destructor Documentation

itk::simple::FFTNormalizedCorrelationImageFilter::FFTNormalizedCorrelationImageFilter ( )

Default Constructor that takes no arguments and initializes default parameters

itk::simple::FFTNormalizedCorrelationImageFilter::~FFTNormalizedCorrelationImageFilter ( )


Member Function Documentation

Image itk::simple::FFTNormalizedCorrelationImageFilter::Execute ( const Image image1,
const Image image2 

Execute the filter on the input images

Image itk::simple::FFTNormalizedCorrelationImageFilter::Execute ( const Image image1,
const Image image2,
uint64_t  requiredNumberOfOverlappingPixels 

Execute the filter on the input images with the given parameters

template<class TImageType >
Image itk::simple::FFTNormalizedCorrelationImageFilter::ExecuteInternal ( const Image image1,
const Image image2 
std::string itk::simple::FFTNormalizedCorrelationImageFilter::GetName ( ) const

Name of this class

Implements itk::simple::ProcessObject.

Definition at line 99 of file sitkFFTNormalizedCorrelationImageFilter.h.

uint64_t itk::simple::FFTNormalizedCorrelationImageFilter::GetRequiredNumberOfOverlappingPixels ( ) const

Definition at line 97 of file sitkFFTNormalizedCorrelationImageFilter.h.

Self& itk::simple::FFTNormalizedCorrelationImageFilter::SetRequiredNumberOfOverlappingPixels ( uint64_t  RequiredNumberOfOverlappingPixels)

Definition at line 93 of file sitkFFTNormalizedCorrelationImageFilter.h.

std::string itk::simple::FFTNormalizedCorrelationImageFilter::ToString ( ) const

Print ourselves out

Reimplemented from itk::simple::ProcessObject.

Friends And Related Function Documentation

Definition at line 122 of file sitkFFTNormalizedCorrelationImageFilter.h.

Member Data Documentation

nsstd::auto_ptr<detail::MemberFunctionFactory<MemberFunctionType> > itk::simple::FFTNormalizedCorrelationImageFilter::m_MemberFactory

Definition at line 124 of file sitkFFTNormalizedCorrelationImageFilter.h.

uint64_t itk::simple::FFTNormalizedCorrelationImageFilter::m_RequiredNumberOfOverlappingPixels

Definition at line 127 of file sitkFFTNormalizedCorrelationImageFilter.h.

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