Class FFTTools_matt

java.lang.Object
  FFTTools_matt

 class FFTTools_matt
extends java.lang.Object

This class offers tools to perform Fourier transform on images.

Adapted from:

IP-LAB
ImageProcessing Laboratories

Freely available software and computer sessions for teaching and programming image processing in Java.

Reference
D. Sage, M. Unser
"Teaching Image-Processing Programming in Java,"
IEEE Signal Processing Magazine, vol. 20, no. 6, pp. 43-52, November 2003.

Author: Daniel Sage
Organisation: Biomedical Image Group (BIG), Swiss Federal Institute of Teachnology Lausanne (EPFL)

Constructor Summary

FFTTools_matt()

Method Summary

static void	doFFT(double[] imageReal, double[] imageImag, int width, int height) Perform the FFT 2D with the method Decimation in Time Each image's dimension has to be a power of two : 2**m
static void	inverseFFT(double[] imageReal, double[] imageImag, int width, int height) Perform an inverse FFT 2D.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FFTTools_matt

FFTTools_matt()

Method Detail

doFFT

public static void doFFT(double[] imageReal,
                         double[] imageImag,
                         int width,
                         int height)

Perform the FFT 2D with the method Decimation in Time Each image's dimension has to be a power of two : 2**m

Parameters:

imageReal - input: Signal, output: Fourier coefficients (real part)

imageImag - input: Signal, output: Fourier coefficients (imaginary part)

width - width of the signal

height - height of the signal

inverseFFT

public static void inverseFFT(double[] imageReal,
                              double[] imageImag,
                              int width,
                              int height)

Perform an inverse FFT 2D. Each image's dimension has to be a power of two : 2**m

Parameters:

imageReal - input: Fourier coefficients (real part) , output: Signal (real part)

imageImag - input: Fourier coefficients (imaginary part), output: Signal (imaginary part)

width - width of the signal

height - height of the signal