vtkImageRFFT Class Reference

Reverse Fast Fourier Transform. More...

#include <vtkImageRFFT.h>

Inheritance diagram for vtkImageRFFT:

Collaboration diagram for vtkImageRFFT:

List of all members.

Public Types
typedef vtkImageFourierFilter	Superclass
Public Member Functions
virtual int	IsA (const char *type)
vtkImageRFFT *	NewInstance () const
int	SplitExtent (int splitExt[6], int startExt[6], int num, int total)
Static Public Member Functions
static vtkImageRFFT *	New ()
static int	IsTypeOf (const char *type)
static vtkImageRFFT *	SafeDownCast (vtkObjectBase *o)
Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const
	vtkImageRFFT ()
	~vtkImageRFFT ()
virtual int	IterativeRequestInformation (vtkInformation *in, vtkInformation *out)
virtual int	IterativeRequestUpdateExtent (vtkInformation *in, vtkInformation *out)
virtual void	ThreadedRequestData (vtkInformation *vtkNotUsed(request), vtkInformationVector **inputVector, vtkInformationVector *vtkNotUsed(outputVector), vtkImageData ***inDataVec, vtkImageData **outDataVec, int outExt[6], int threadId)

---

Detailed Description

Reverse Fast Fourier Transform.

vtkImageRFFT implements the reverse fast Fourier transform. The input can have real or complex data in any components and data types, but the output is always complex doubles with real values in component0, and imaginary values in component1. The filter is fastest for images that have power of two sizes. The filter uses a butterfly fitlers for each prime factor of the dimension. This makes images with prime number dimensions (i.e. 17x17) much slower to compute. Multi dimensional (i.e volumes) FFT's are decomposed so that each axis executes in series. In most cases the RFFT will produce an image whose imaginary values are all zero's. In this case vtkImageExtractComponents can be used to remove this imaginary components leaving only the real image.

See also:

vtkImageExtractComponenents

Tests:

vtkImageRFFT (Tests)

Definition at line 44 of file vtkImageRFFT.h.

---

Member Typedef Documentation

typedef vtkImageFourierFilter vtkImageRFFT::Superclass

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3.

Reimplemented from vtkImageFourierFilter.

Definition at line 48 of file vtkImageRFFT.h.

---

Constructor & Destructor Documentation

vtkImageRFFT::vtkImageRFFT

(

)

[inline, protected]

Definition at line 63 of file vtkImageRFFT.h.

vtkImageRFFT::~vtkImageRFFT

(

)

[inline, protected]

Definition at line 64 of file vtkImageRFFT.h.

---

Member Function Documentation

static vtkImageRFFT* vtkImageRFFT::New

(

)

[static]

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

Reimplemented from vtkAlgorithm.

static int vtkImageRFFT::IsTypeOf

(

const char *

type

)

[static]

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3.

Reimplemented from vtkImageFourierFilter.

virtual int vtkImageRFFT::IsA

(

const char *

type

)

[virtual]

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3.

Reimplemented from vtkImageFourierFilter.

static vtkImageRFFT* vtkImageRFFT::SafeDownCast

(

vtkObjectBase *

o

)

[static]

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3.

Reimplemented from vtkImageFourierFilter.

virtual vtkObjectBase* vtkImageRFFT::NewInstanceInternal

(

)

const [protected, virtual]

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3.

Reimplemented from vtkImageFourierFilter.

vtkImageRFFT* vtkImageRFFT::NewInstance

(

)

const

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3.

Reimplemented from vtkImageFourierFilter.

int vtkImageRFFT::SplitExtent	(	int	splitExt[6],
		int	startExt[6],
		int	num,
		int	total
	)		[virtual]

For streaming and threads. Splits output update extent into num pieces. This method needs to be called num times. Results must not overlap for consistent starting extent. Subclass can override this method. This method returns the number of pieces resulting from a successful split. This can be from 1 to "total". If 1 is returned, the extent cannot be split.

Reimplemented from vtkThreadedImageAlgorithm.

virtual int vtkImageRFFT::IterativeRequestInformation	(	vtkInformation *	in,
		vtkInformation *	out
	)		[protected, virtual]

Reimplemented from vtkImageIterateFilter.

virtual int vtkImageRFFT::IterativeRequestUpdateExtent	(	vtkInformation *	in,
		vtkInformation *	out
	)		[protected, virtual]

Reimplemented from vtkImageIterateFilter.

virtual void vtkImageRFFT::ThreadedRequestData	(	vtkInformation *	vtkNotUsedrequest,
		vtkInformationVector **	inputVector,
		vtkInformationVector *	vtkNotUsedoutputVector,
		vtkImageData ***	inDataVec,
		vtkImageData **	outDataVec,
		int	outExt[6],
		int	threadId
	)		[protected, virtual]

---

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

• dox/Imaging/Fourier/vtkImageRFFT.h