2d Fourier Transform Software For Mac
Demonstrates a Descrete Fourier Transorm. This application shows the steps inside a Discrete Fourier Transform. It may help you grasp the concept.
- InstallDFT.exe
- WheresJames Software
- Freeware (Free)
- 184 Kb
- WinXP, WinNT 4.x, WinNT 3.x, WinME, Win98, Win95
This program is intended as an educational tool to explain the concept of Discrete FourierTransform (DFT). It uses the Fast FourierTransform to calculate the DFT of a given arbitrary time domain signal and plots it. ...
- Concept-dsp
- concept-dsp
- Freeware (Free)
- 3.57 Mb
- Windows; Linux
The Fourier Transform is a powerful tool allowing us to move back and forth between the spatial and frequency domains. Many of our explanations of key aspects of signal processing rely on an understanding of how and why a certain operation is performed in one domain or another. This applet helps students feel comfortable with these explanations, helping to build a strong intuitive grasp of how signals in one domain correspond to signals in .
- 1d_fast_fourier_transform.jar
- Daniel L. Gould
- Freeware (Free)
- 245 Kb
- WinXP, Win2000, Windows 7
PyFFTW provieds Python bindings to the FFTW3 'Fastest FourierTransform in the West. PyFFTW: Python bindings to the FFTW3 C-libraryPyFFTW provieds Python bindings to the FFTW3 'Fastest Fourier Transform in the West.' C-library(http://www.
- pyFFTW-0.5.1.tar.gz
- Jochen Schroeder
- Shareware ($)
- 163 Kb
- Linux
A visualization of the fouriertransform applied to sound data. Analyzes a time-domain sound sample using the FourierTransform, and graphically displays the results and sound in real time. Attempts to audio into sheet. ...
- soundwav0.1.tar.gz
- soundwav
- Freeware (Free)
- 39 Kb
- Windows; Mac; Linux
Description and detailed explanation on FourierTransform, some FFT, LPC etc. Runable project demonstrates DCT transform on continuous audio, show and edit audio source with different zooming and. ...
- Analysis.zip
- arkadianalysis
- Freeware (Free)
- 373 Kb
- Windows
A Fast Fourier Transform (FFT) method for frequency sparse functions. Recovers the k most energetic frequencies hidden in a bandwidth-N function in k*polylog(N) time..
- AAFFT.tgz
- aafftannarborfa
- Freeware (Free)
- 147 Kb
- N/A
2D FFT/iFFT (Fast FourierTransform) plugin is compatible with Adobe Photoshop / Paint Shop Pro / Corel Paint Shop Pro. It uses one of the fastest implementations of the Discrete FourierTransform and has many applications including periodic noise. ...
- KamlexFFTPluginSetup.exe
- KamLex
- Freeware (Free)
- 499 Kb
- Windows Vista, 2003, XP, 2000
This program splits sound taken from the microphone into basic frequencies and displays them in real-time. Whistle to the microphone and see the plot move up and down with the pitch change. This uses the Fast FourierTransform (FFT) Transform.
- freq.zip
- Reliable Software
- Shareware ($)
- 73 Kb
- 9x, NT, 2000, ME, XP
VB Super Fast Fourier Transform ActiveX dll source code. Perform speed optimized DFT and IFT..
- VB Fast Fourier Transformsource code
- Borg Design
- Commercial ($10.00)
- Win95, Win98, WinME, WinNT 3.x, WinNT 4.x, Windows2000, WinXP, Windows2003
smib is a mosaic of FORTH and LISP,. smib is a mosaic of FORTH and LISP, C Sauce and an experimental programming language close to mathematical language. In this version : law of large numbers, central limit theorem, hyperbolic trigonometry, warnings are cleaned .
- smib-0.22.zip
- pbillet
- Freeware (Free)
- 3.17 Mb
- Linux
Fourier Transforms, which can be useful in teaching Crystallography, since they are related to Optical Transforms (e.g. laser diffraction patterns).
- FTLSE_Setup.exe
- JCrystalSoft
- Freeware (Free)
- 6.83 Mb
- Win All
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Related:Fourier Transform Calculator - Fourier Transform Properties - Fourier Transform Pairs - Fourier Transform Table - Fast Fourier Transform
2-D Fourier Transforms
The fft2 function transforms2-D data into frequency space. For example, you can transform a 2-Doptical mask to reveal its diffraction pattern.
Two-Dimensional Fourier Transform
The following formula defines the discrete Fourier transform Y ofan m-by-n matrix X.
ωm and ωn arecomplex roots of unity defined by the following equations.
i is the imaginary unit, p and j areindices that run from 0 to m–1, and q and k areindices that run from 0 to n–1. The indicesfor X and Y are shifted by 1in this formula to reflect matrix indices in MATLAB®.
Computing the 2-D Fourier transform of X isequivalent to first computing the 1-D transform of each column of X,and then taking the 1-D transform of each row of the result. In otherwords, the command fft2(X) is equivalent to Y= fft(fft(X).').'.
2-D Diffraction Pattern
In optics, the Fourier transform can be used to describe the diffraction pattern produced by a plane wave incident on an optical mask with a small aperture [1]. This example uses the fft2 function on an optical mask to compute its diffraction pattern.
Create a logical array that defines an optical mask with a small, circular aperture.
Use fft2 to compute the 2-D Fourier transform of the mask, and use the fftshift function to rearrange the output so that the zero-frequency component is at the center. Plot the resulting diffraction pattern frequencies. Blue indicates small amplitudes and yellow indicates large amplitudes.
To enhance the details of regions with small amplitudes, plot the 2-D logarithm of the diffraction pattern. Very small amplitudes are affected by numerical round-off error, and the rectangular grid causes radial asymmetry.
2d Fourier Transform Polar
References
[1] Fowles, G. R. Introductionto Modern Optics. New York: Dover, 1989.
See Also
Python 2d Fourier Transform
fft | fft2 | fftn | fftshift | ifft2