vtkImageRFFT Class Reference

#include <vtkImageRFFT.h>

Inheritance diagram for vtkImageRFFT:

[legend]Collaboration diagram for vtkImageRFFT:

[legend]List of all members.

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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 43 of file vtkImageRFFT.h.

int	SplitExtent (int splitExt[6], int startExt[6], int num, int total)
static vtkImageRFFT *	SafeDownCast (vtkObject *o)
Public Types
typedef vtkImageFourierFilter	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
Static Public Member Functions
static vtkImageRFFT *	New ()
static int	IsTypeOf (const char *type)
Protected Member Functions
	vtkImageRFFT ()
	~vtkImageRFFT ()
virtual int	IterativeRequestInformation (vtkInformation *in, vtkInformation *out)
virtual int	IterativeRequestUpdateExtent (vtkInformation *in, vtkInformation *out)
void	ThreadedExecute (vtkImageData *inData, vtkImageData *outData, int outExt[6], int threadId)

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Member Typedef Documentation

typedef vtkImageFourierFilter vtkImageRFFT::Superclass

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3. Reimplemented from vtkImageFourierFilter. Definition at line 47 of file vtkImageRFFT.h.

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Constructor & Destructor Documentation

vtkImageRFFT::vtkImageRFFT (   )  [inline, protected]

Definition at line 62 of file vtkImageRFFT.h.

vtkImageRFFT::~vtkImageRFFT (   )  [inline, protected]

Definition at line 63 of file vtkImageRFFT.h.

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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.

virtual const char* vtkImageRFFT::GetClassName (   )  [virtual]

Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3. Reimplemented from vtkImageFourierFilter.

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 (  vtkObject *  o  )  [static]

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 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.

void vtkImageRFFT::ThreadedExecute (  vtkImageData *  inData, vtkImageData *  outData, int  outExt[6], int  threadId )  [protected, virtual]

Reimplemented from vtkThreadedImageAlgorithm.

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

• dox/Imaging/vtkImageRFFT.h

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