casa::FFT2D Class Reference

#include <FFT2D.h>

List of all members.

Public Member Functions
	FFT2D (Bool useFFTW=True)
	This is a not a full generic fft class...use FFTServer or LatticeFFT for that.
	~FFT2D ()
FFT2D &	operator= (const FFT2D &other)
void	r2cFFT (Complex *&out, Float *&in, Long x, Long y)
	out has to be a pointer to an array [(x/2+1), y] shape
void	r2cFFT (Lattice< Complex > &out, Lattice< Float > &in)
	Real to complex FFT2D ..each plane of out will contain FFT in X/2+1, Y...
void	c2cFFT (Complex *&out, Long x, Long y, Bool toFreq=True)
	In place 2D FFT; out has to be of shape [x,y] (origin is at the x/2,y/2).
void	c2cFFT (DComplex *&out, Long x, Long y, Bool toFreq=True)
void	c2cFFT (Lattice< Complex > &inout, Bool toFreq=True)
	This will return the 2D FFT of each x-y planes back into the lattice.
void	c2cFFT (Lattice< DComplex > &inout, Bool toFreq=True)
void	fftShift (Complex *&scr, Long x, Long y, Bool toFreq=False)
	The toFreq=False in FFTShift does the normalization of 1/N_sample expected of ifft.
void	fftShift (DComplex *&scr, Long x, Long y, Bool toFreq=False)
void	fftShift (Float *&scr, Long x, Long y)
void	doFFT (Complex *&out, Long x, Long y, Bool toFreq)
void	doFFT (DComplex *&out, Long x, Long y, Bool toFreq)
void	doFFT (Complex *&out, Float *&in, Long x, Long y)
Private Attributes
fftwf_plan	planC2C_p
	FFTW stuff.
fftwf_plan	planR2C_p
fftw_plan	planC2CD_p
Bool	useFFTW_p
std::vector< Float >	wsave_p
	FFTPack stuff.
Int	lsav_p

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Detailed Description

Definition at line 34 of file FFT2D.h.

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Constructor & Destructor Documentation

casa::FFT2D::FFT2D

(

Bool

useFFTW = True

)

This is a not a full generic fft class...use FFTServer or LatticeFFT for that.

This is optimized with minimal memcopies for 2D FFTs Assumes 2D x, y array to be even numbers (e.g (100, 200)...will not work for (101, 200))

casa::FFT2D::~FFT2D

(

)

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Member Function Documentation

void casa::FFT2D::c2cFFT	(	Lattice< DComplex > &	inout,
		Bool	toFreq = True
	)

void casa::FFT2D::c2cFFT	(	Lattice< Complex > &	inout,
		Bool	toFreq = True
	)

This will return the 2D FFT of each x-y planes back into the lattice.

void casa::FFT2D::c2cFFT	(	DComplex *&	out,
		Long	x,
		Long	y,
		Bool	toFreq = True
	)

void casa::FFT2D::c2cFFT	(	Complex *&	out,
		Long	x,
		Long	y,
		Bool	toFreq = True
	)

In place 2D FFT; out has to be of shape [x,y] (origin is at the x/2,y/2).

void casa::FFT2D::doFFT	(	Complex *&	out,
		Float *&	in,
		Long	x,
		Long	y
	)

void casa::FFT2D::doFFT	(	DComplex *&	out,
		Long	x,
		Long	y,
		Bool	toFreq
	)

void casa::FFT2D::doFFT	(	Complex *&	out,
		Long	x,
		Long	y,
		Bool	toFreq
	)

void casa::FFT2D::fftShift	(	Float *&	scr,
		Long	x,
		Long	y
	)

void casa::FFT2D::fftShift	(	DComplex *&	scr,
		Long	x,
		Long	y,
		Bool	toFreq = False
	)

void casa::FFT2D::fftShift	(	Complex *&	scr,
		Long	x,
		Long	y,
		Bool	toFreq = False
	)

The toFreq=False in FFTShift does the normalization of 1/N_sample expected of ifft.

FFT2D& casa::FFT2D::operator=

(

const FFT2D &

other

)

void casa::FFT2D::r2cFFT	(	Lattice< Complex > &	out,
		Lattice< Float > &	in
	)

Real to complex FFT2D ..each plane of out will contain FFT in X/2+1, Y...

the remainder of of the X part is untouched of out lattice is larger than X/2+1 on the x-axis

void casa::FFT2D::r2cFFT	(	Complex *&	out,
		Float *&	in,
		Long	x,
		Long	y
	)

out has to be a pointer to an array [(x/2+1), y] shape

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Member Data Documentation

Int casa::FFT2D::lsav_p [private]

Definition at line 70 of file FFT2D.h.

fftwf_plan casa::FFT2D::planC2C_p [private]

FFTW stuff.

Definition at line 64 of file FFT2D.h.

fftw_plan casa::FFT2D::planC2CD_p [private]

Definition at line 66 of file FFT2D.h.

fftwf_plan casa::FFT2D::planR2C_p [private]

Definition at line 65 of file FFT2D.h.

Bool casa::FFT2D::useFFTW_p [private]

Definition at line 67 of file FFT2D.h.

std::vector<Float> casa::FFT2D::wsave_p [private]

FFTPack stuff.

Definition at line 69 of file FFT2D.h.

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

• code/synthesis/Utilities/FFT2D.h