Fourier

this application receives binary image / matrix . it returns the indexes of rows and columns by the order . each next point is the close one. so indexes are by order . not as retuned by the find command.also if someone can improve the steps after pdist to use linkage or dendrogram. it is useful... Platforms: Matlab

The animated response of several classical system models is presented. Examples include a) large amplitude pendulum motion b) falling elastic cable c) forced response of a spring-mass-damper system d) vibrating string either released with initial deflection, or shaken at one end, or subjected to... Platforms: Matlab

The Generalised Adaptive Fast-Fourier Evolver (GAFFE) toolbox is a framework that greatly simplifies the solution of complex partial differential equations (PDEs) in an adaptive manner.By default both the step-size and the mesh adapt to the problem at hand to optimise the speed of execution for a... Platforms: Matlab

Learn how to make waves of all different shapes by adding up sines or cosines. Make waves in space and time and measure their wavelengths and periods. See how changing the amplitudes of different harmonics changes the waves. Compare different mathematical expressions for your waves. Platforms: Mac

According to shannon theory it is possible to reconstruct a band limited signal from its Fourier components provided it is sampled sufficiently...just to demonstrate this, posting a small example based on that Platforms: Matlab

This applet incorporates some image processing techniques in the Fourier optics domain. You can compute and see the Fourier transform of an object and the convolution between two images. You can also simulate the Vander Lugt correlator (matched filter, phase-only filter and inverse filter) and... Platforms: Mac

Radix 2 FFT using Decimation in FrequencyTruly Appreciates the Wonder Geniuses Joseph Fourier & Cooley Tuckey Platforms: Matlab

1) plot_chain_code(ai, color, line_width)This function will plot the given chain code. The chain code (ai) should be incolumn vector.Example:>> ai = [5 4 1 2 3 4 3 0 0 1 0 1 0 0 0 7 7 1 1 0 7 5 4 5 4 5 0 6 5 4 1 3 4 4 4 4 6];>> plot_chain_code(ai)2) plot_fourier_approx(ai, n, m, normalized,... Platforms: Matlab

This matlab scprit calculates fractal dimension and intercept of a 3D volume along each redial line using Fourier analytical technique. Directionally averaged fractal dimension, intercept and Hedgehog plots of fractal dimension and intercept of each direction are given. Platforms: Matlab

Increasing and decreasing chirp signals give same frequency spectrum in fourier domain. Then how wud one find out what it is?.. its' the phase of the signal. The phases are just opposite. See the matlab figure generated u get to know. This file is for beginners who wants to know what role FFT and... Platforms: Matlab

Demo techniques of nonlinear eigenmaps for the purpose of recovering low-dimensional geometries.Using manifold learning techniques (aka diffusion maps, Laplacian eigenmaps, intrinsic Fourier analysis) this file recovers the true, two-dimensional structure of a dataset of points embedded in 3D. Platforms: Matlab

Run this program with a small image of about 100x100 pixels its because though it works on image of any size but for large images the execution time is very high. So if you do not want to wait for a very long time use a small image. Platforms: Matlab

GFourier is a plug-in for GIMP; with GFourier, you can use Fourier Analysis, to enhance and recover your images. More specifically, GFourier calculates the Fourier Transform of an image; you can then design and apply some simple filters; later, you can use the Inverse Fourier Transform to... Platforms: *nix

Program FFT2SURF plots double Fourier series representations for several different surfaces. The figures show effects of the number of series terms and use of Lanczos sigma factors to smooth Gibbs oscillations. The Fourier series of a doubly periodic function with periods px and py has the... Platforms: Matlab

This short m-file demonstrates the Gibbs' phenomenon in Signal Processing.It clearly shows the "ringing" when the number of Fourier components are enhanced while synthesising a square waveform. Platforms: Matlab

Simple implementation of [1] with small modification. Hopefully this is going to help beginners in speech/audio signal processing.[1] X. Zhu, G. T. Beauregard and L. L. Wyse, "Real-Time Signal Estimation From Modified Short-Time Fourier Transform Magnitude Spectra", IEEE Trans. on Audio, Speech,... Platforms: Matlab

Compute the discrete Fourier transform at specified frequencies, not using fft.Why one may need this?(1) MATLAB fft function computes the amplitude of signals only (no phase).(2) Once having the recorded time-series data, one often uses fft to do the spectral analysis. However, the frequency set... Platforms: Matlab

Basic implementation of the Phase Spectrum Compensation (PSC) [1] method for single channel speech enhancement is included, along with a demo that illustrates its usage.References:[1] A.P. Stark, K.K. Wojcicki, J.G. Lyons and K.K. Paliwal, "Noise driven short time phase spectrum compensation... Platforms: Matlab

Application for modeling and analysis of stationary noise signals.The method of automatic allocation of non-harmonic periodic components, based on the Fourier expansion, used in this application. GUI in Russian! Platforms: Matlab

With this Fourier Calculator a periodic signal can be analyzed and represented in figures with harmonics.The signals can easily be produced in the model. Platforms: Matlab