fourier.h File Reference

Definitions related to the Fourier transform. More...

#include "MyImageBuffer.h"

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Classes
class	MyFourierBuffer
	Class used to wrap the Fourier transform with FFTW library. More...
Defines
#define	FOR_DIRECT   1
	Prepare a buffer for direct transform.
#define	FOR_INVERSE   2
	Prepare a buffer for inverse transform.
#define	FFTW_INIT_THREADS   fftwf_init_threads
	Initialize the FFTW threads.
#define	FFT_MALLOC   fftwf_malloc
#define	FFTW_PLAN_WITH_NTHREADS   fftwf_plan_with_nthreads
	Prepare N threads for FFTW.
#define	FFT_PLAN_R2C   fftwf_plan_many_dft_r2c
	Plan a direct transform.
#define	FFT_PLAN_C2R   fftwf_plan_many_dft_c2r
	Plan an inverse transform.
#define	FFT_EXECUTE   fftwf_execute
	Execute a planned transform.
#define	FFT_FREE   fftwf_free
	Deallocate the buffer.
#define	FFT_DESTROY_PLAN   fftwf_destroy_plan
	Deallocate a plan.
#define	colorComplexValue(buf, x, y, c)   (((COMPLEX*)(buf)->_data)[((y)+(c)*(buf)->_h)*(buf)->_spadw+(x)])
	Access to the complex value of a pixel in the spectrum.
Functions
short	log_2 (short val)
	Base 2 logarithm.

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Detailed Description

Definitions related to the Fourier transform.

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Define Documentation

#define colorComplexValue	(	buf,
		x,
		y,
		c		)	(((COMPLEX*)(buf)->_data)[((y)+(c)*(buf)->_h)*(buf)->_spadw+(x)])

Access to the complex value of a pixel in the spectrum.

This method is provided as a macro for speed purpose.

#define FFT_MALLOC   fftwf_malloc

Allocate aligned on SIMD

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Function Documentation

short log_2

(

short

val

)

Base 2 logarithm.

Parameters:

val

The source value

Returns:

Its logarithm.

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