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vtkImageRFFT Class Reference

Reverse Fast Fourier Transform. More...

#include <vtkImageRFFT.h>

Inheritance diagram for vtkImageRFFT:

[legend]Collaboration diagram for vtkImageRFFT:

[legend]List of all members.

Public Methods
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
virtual void	IterativeExecuteData (vtkImageData *in, vtkImageData *out)
int	SplitExtent (int splitExt[6], int startExt[6], int num, int total)
Static Public Methods
vtkImageRFFT *	New ()
int	IsTypeOf (const char *type)
vtkImageRFFT *	SafeDownCast (vtkObject *o)
Protected Methods
	vtkImageRFFT ()
	~vtkImageRFFT ()
void	ExecuteInformation (vtkImageData *inData, vtkImageData *outData)
void	ComputeInputUpdateExtent (int inExt[6], int outExt[6])
void	ExecuteInformation ()
void	ThreadedExecute (vtkImageData *inData, vtkImageData *outData, int outExt[6], int threadId)

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Detailed Description

Reverse Fast Fourier Transform.

Date:

2001/12/07 14:03:51

Revision:

1.30

Thanks:

Thanks to C. Charles Law who developed this class.

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 floats 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 72 of file vtkImageRFFT.h.

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Constructor & Destructor Documentation

vtkImageRFFT::vtkImageRFFT (    )  [inline, protected]

Definition at line 94 of file vtkImageRFFT.h.

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

Definition at line 95 of file vtkImageRFFT.h.

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Member Function Documentation

vtkImageRFFT* vtkImageRFFT::New (    )  [static]

Instantiate object with no start, end, or progress methods. Reimplemented from vtkImageToImageFilter.

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

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

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.

vtkImageRFFT* vtkImageRFFT::SafeDownCast (  vtkObject *    o )  [static]

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 vtkImageToImageFilter.

virtual void vtkImageRFFT::IterativeExecuteData (  vtkImageData *    in, vtkImageData *    out )  [inline, virtual]

Reimplemented from vtkImageIterateFilter. Definition at line 90 of file vtkImageRFFT.h.

void vtkImageRFFT::ExecuteInformation (  vtkImageData *    inData, vtkImageData *    outData )  [protected, virtual]

Reimplemented from vtkImageIterateFilter.

void vtkImageRFFT::ComputeInputUpdateExtent (  int    inExt[6], int    outExt[6] )  [protected, virtual]

Reimplemented from vtkImageIterateFilter.

void vtkImageRFFT::ExecuteInformation (    )  [inline, protected, virtual]

Reimplemented from vtkImageIterateFilter. Definition at line 99 of file vtkImageRFFT.h.

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

If the subclass does not define an Execute method, then the task will be broken up, multiple threads will be spawned, and each thread will call this method. It is public so that the thread functions can call this method. Reimplemented from vtkImageToImageFilter.

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

• Imaging/vtkImageRFFT.h

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