Fourier Transform Operations
[Data Manipulation]

Collaboration diagram for Fourier Transform Operations:

Files
file	psVectorFFT.h
	Contains FFT transform related functions for psVector.
file	psImageConvolve.h
	image convolution functionality
file	psImageFFT.h
	Contains FFT transform related functions for psImage.
Enumerations
enum	psFFTFlags { PS_FFT_FORWARD = 1, PS_FFT_REVERSE = 2, PS_FFT_REAL_RESULT = 4 }
	Specify direction of FFT. More...
Functions
psVector *	psVectorFFT (psVector *out, const psVector *in, psFFTFlags direction)
	Forward and reverse FFT calculations.
psVector *	psVectorReal (psVector *out, const psVector *in)
	extract the real portion of a complex vector
psVector *	psVectorImaginary (psVector *out, const psVector *in)
	extract the imaginary portion of a complex vector
psVector *	psVectorComplex (psVector *out, const psVector *real, const psVector *imag)
	creates a complex vector from separate real and imaginary vectors
psVector *	psVectorConjugate (psVector *out, const psVector *in)
	computes the complex conjugate of a vector
psVector *	psVectorPowerSpectrum (psVector *out, const psVector *in)
	computes the power spectrum of a vector
psImage *	psImageFFT (psImage *out, const psImage *in, psFFTFlags direction)
	Forward and reverse FFT calculations.
psImage *	psImageReal (psImage *out, const psImage *in)
	extract the real portion of a complex image
psImage *	psImageImaginary (psImage *out, const psImage *in)
	extract the imaginary portion of a complex image
psImage *	psImageComplex (psImage *out, const psImage *real, const psImage *imag)
	creates a complex image from separate real and imaginary plane images
psImage *	psImageConjugate (psImage *out, const psImage *in)
	computes the complex conjugate of an image
psImage *	psImagePowerSpectrum (psImage *out, const psImage *in)
	computes the power spectrum of an image

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Enumeration Type Documentation

enum psFFTFlags

Specify direction of FFT. Enumeration values: PS_FFT_FORWARD  psImageFFT/psVectorFFT should perform a forward FFT. PS_FFT_REVERSE  psImageFFT/psVectorFFT should perform a reverse FFT. PS_FFT_REAL_RESULT  psImageFFT/psVectorFFT should perform a reverse FFT with a real result. Definition at line 24 of file psVectorFFT.h.

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Function Documentation

psImage* psImageComplex (  psImage *  out, const psImage *  real, const psImage *  imag )

creates a complex image from separate real and imaginary plane images Returns: psImage* resulting complex image Parameters: out  a psImage to recycle. If NULL, a new psImage is made. real  the real plane image imag  the imaginary plane image

psImage* psImageConjugate (  psImage *  out, const psImage *  in )

computes the complex conjugate of an image Returns: psImage* the complex conjugate of the 'in' image Parameters: out  a psImage to recycle. If NULL, a new psImage is made. in  the psImage to compute conjugate of

psImage* psImageFFT (  psImage *  out, const psImage *  in, psFFTFlags  direction )

Forward and reverse FFT calculations. This takes as input the image of interest (in) and the direction (direction), which is specified by an enumerated type psFftDirection. The input image may be of type psF32 or psC32, the result is always psC32. If the input vector is psF32, the direction must be forward. Returns: psImage* the FFT transformation result Parameters: out  a psImage to recycle. If NULL, a new psImage is made. in  the psImage to apply transform to direction  the direction of the transform

psImage* psImageImaginary (  psImage *  out, const psImage *  in )

extract the imaginary portion of a complex image Returns: psImage* imaginary portion of the input image. Parameters: out  a psImage to recycle. If NULL, a new psImage is made. in  the psImage to extract imaginary portion from

psImage* psImagePowerSpectrum (  psImage *  out, const psImage *  in )

computes the power spectrum of an image Returns: psImage* the power spectrum of the 'in' image Parameters: out  a psImage to recycle. If NULL, a new psImage is made. in  the psImage to power spectrum of

psImage* psImageReal (  psImage *  out, const psImage *  in )

extract the real portion of a complex image Returns: psImage* real portion of the input image. Parameters: out  a psImage to recycle. If NULL, a new psImage is made. in  the psImage to extract real portion from

psVector* psVectorComplex (  psVector *  out, const psVector *  real, const psVector *  imag )

creates a complex vector from separate real and imaginary vectors Returns: psVector* resulting complex vector Parameters: out  a psVector to recycle. If NULL, a new psVector is made. real  the real vector imag  the imaginary vector

psVector* psVectorConjugate (  psVector *  out, const psVector *  in )

computes the complex conjugate of a vector Returns: psVector* the complex conjugate of the 'in' vector Parameters: out  a psVector to recycle. If NULL, a new psVector is made. in  the psVector to compute conjugate of

psVector* psVectorFFT (  psVector *  out, const psVector *  in, psFFTFlags  direction )

Forward and reverse FFT calculations. This takes as input the vector of interest (in) and the direction (direction), which is specified by an enumerated type psFftDirection. The input vector may be of type psF32 or psC32, the result is always psC32. If the input vector is psF32, the direction must be forward. Returns: psVector* the FFT transformation result Parameters: out  a psVector to recycle. If NULL, a new psVector is made. in  the vector to apply transform to direction  the direction of the transform

psVector* psVectorImaginary (  psVector *  out, const psVector *  in )

extract the imaginary portion of a complex vector Returns: psVector* imaginary portion of the input vector. Parameters: out  a psVector to recycle. If NULL, a new psVector is made. in  the psVector to extract imaginary portion from

psVector* psVectorPowerSpectrum (  psVector *  out, const psVector *  in )

computes the power spectrum of a vector Returns: psVector* the power spectrum of the 'in' vector Parameters: out  a psVector to recycle. If NULL, a new psVector is made. in  the psVector to power spectrum of

psVector* psVectorReal (  psVector *  out, const psVector *  in )

extract the real portion of a complex vector Returns: psVector* real portion of the input vector. Parameters: out  a psVector to recycle. If NULL, a new psVector is made. in  the psVector to extract real portion from

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