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# vtkImageRFFT Class Reference

`#include <vtkImageRFFT.h>`

Inheritance diagram for vtkImageRFFT:

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Collaboration diagram for vtkImageRFFT:

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List of all members.

## Detailed Description

Reverse Fast Fourier Transform.

Date:
  2002/01/22 15:33:16

Revision:
  1.32

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

Created by:
  - Law, Charles

CVS contributions (if > 5%):
  - Law, Charles (82%)
  - Martin, Ken (9%)

CVS logs (CVSweb):
  - .`cxx` (`/Imaging/vtkImageRFFT.cxx)`
  - .`h` (`/Imaging/vtkImageRFFT.h)`

Tests:
  vtkImageRFFT (Tests)

Definition at line 58 of file vtkImageRFFT.h.

## Public Types

typedef vtkImageFourierFilter | Superclass

## 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)

## Member Typedef Documentation

typedef vtkImageFourierFilter vtkImageRFFT::Superclass

| Construct an instance of vtkImageDecomposeFilter filter with default dimensionality 3. Reimplemented from vtkImageFourierFilter. Definition at line 62 of file vtkImageRFFT.h.

## Constructor & Destructor Documentation

vtkImageRFFT::vtkImageRFFT | ( |  | ) | `[inline, protected]`

| Definition at line 80 of file vtkImageRFFT.h.

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

| Definition at line 81 of file vtkImageRFFT.h.

## Member Function Documentation

vtkImageRFFT* vtkImageRFFT::New | ( |  | ) | `[static]`

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

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]`

| Implements vtkImageIterateFilter. Definition at line 76 of file vtkImageRFFT.h. References vtkImageToImageFilter::MultiThread().

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 85 of file vtkImageRFFT.h. References vtkImageIterateFilter::ExecuteInformation().

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.

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

- Imaging/vtkImageRFFT.h