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This article consists of a brief discussion of the energy density over time or frequency that is obtained with the wavelet transform. Also an efficient algorithm is suggested to calculate the continuous transform with the Morlet wavelet. The energy values of the Wavelet transform are compared with the power spectrum of the Fourier transform. Useful definitions for power spectra are given. The focus of the work is on simple measures to evaluate...



This program calculates the non-destructive zoom Fast Fourier transform of a time history.

The input file must be time(sec) and amplitude(units)

Reference: Randall, Frequency Analysis, Bruel & Kjaer, page 170.



Image compression using wavelet transform

*wavelet transform give better information about non-stationary signals in time domain



Finding the Fourier transform of a rectangular pulse..
filtering the spectrum and regenerating the signal using
the filtered spectrum is done...
at the end Rayleigh theorem is proved by showing that the energy content of both time...



MGWT: Identification of protein coding regions using the Modified
Gabor-wavelet transform.

Sequence of test:
F56F11.4.fasta (included into the zip file)
http://www.ncbi.nlm.nih.gov/entrez/viewer....de&val=AF099922



PCSA is a frequency domain analysis technique that can be used to transform PSDs (as those in a spectrogram) to the form of a two-dimensional histogram with frequency-magnitude bins. PCSA can be used to examine the spectral characteristics of a...



The library includes compiled FIR filters, redundant and non redundant wavelet transform with dynamically sized channels, with applications to denoising and differentiation.



function [g] = FFTPF1D (X,binsize, f, P)
Discrete Fourier Transform Low/High Pass Filter.
% This is a simply implement of such a filter for a given 1-D data.
X: the array of you data, each data point is a bin of signal
...



This function returns N point DFT samples of 2dw band of Fourier transform of a sequence. Typically, fft() returns N samples of Fourier transform ranging from 0 to 2pi. This function takes the N-point DFT samples and returns N-point samples...



Used in image compression, the haar transform is an alternative to the DCT transformation. This file compute an n*n Haar matrix. (same use as "dctmtx")



rilt Regularized Inverse Laplace Transform

[g,yfit,cfg] = rilt(t,y,s,g0,alpha)

Array g(s) is the Inverse Laplace Transform of the array y(t), calculated by a regularized least squares method.

This script is an...



Circular Hough transform based on the gradient field of an image.
1. Operates on grayscale images, NOT B/W bitmaps.
2. NO loops in the implementation of Circular Hough transform, which means faster operation but at the same time larger...



Computes matrices required to transform a state space control system into Controllable or Observable form.



Hough transform for circles in any size.
returns a list of all circles found
(position and radius) in an RGB image.

includes function for:
drawing a circle on an image.
finding the maximum points in a 1d signal.



This is a generalized version of Principal Component Pursuit (PCP) where the sparsity is assumed in a transform domain and not in measurement domain. Moreover the samples obtained are lower dimensional projections.
Inputs
y -...



Fast and Efficient Speech Signal Classification with a Novel Nonlinear Transform
Dogaru, R.;
Information Technology Convergence, 2007. ISITC 2007. International Symposium on
23-24 Nov. 2007 Page(s):43 - 47
Digital Object...



matlab code using daubechies wavelet for wavelet transform



This m file acquired and processed using chirp Fourier transform spectrum of HR4000 spectrometer



This Hough transform is highly optimized. It uses the midpoint circle algorithm to draw the circles in voting space quickly and without gaps. It also includes an option for searching only part of the image to increase speed if a rough estimate of...



This Face Recognition System uses Kekre Transform for Face recognition depicted through a GUI.This GUI depicts the face recognition system developed through feature extraction by Kekre Transform Algorithm. There are several functions that are...