نتایج جستجو برای: continuous wavelet transform

تعداد نتایج: 391819  

2008
Jonathan M. Lilly

Properties determining optimal behavior of continuous analytic wavelet functions are investigated, and wavelet functions nearly obtaining such behavior are identified. This is accomplished through detailed investigation of the generalized Morse wavelets, a highly flexible family of exactly analytic continuous wavelets. The degree of time/frequency localization, the existence of a unique interpr...

Journal: :Remote Sensing 2018
Stefano Zecchetto

This paper aims to illustrate and test a method, based on the Two-Dimensional Continuous Wavelet Transform (2D-CWT), developed to extract the wind directions from the Synthetic Aperture Radar (SAR) images. The knowledge of the wind direction is essential to retrieve the wind speed by using the radar-backscatter versus wind speed algorithms. The method has been applied to 61 SAR images from diff...

2015
Manuel Sam Ribeiro Junichi Yamagishi Robert A. J. Clark

The Continuous Wavelet Transform (CWT) has been recently proposed to model f0 in the context of speech synthesis. It was shown that systems using signal decomposition with the CWT tend to outperform systems that model the signal directly. The f0 signal is typically decomposed into various scales of differing frequency. In these experiments, we reconstruct f0 with selected frequencies and ask na...

2007
Emmanouil Athanasiadis Dionisis A. Cavouras Panagiota Spyridonos Ioannis Kalatzis George Nikiforidis

In the present study, a new gridding method based on continuous wavelet transform (CWT) was performed. Line profiles of x and y axis were calculated, resulting to 2 different signals. These signals were independently processed by means of CWT at 15 different levels, using daubechies 4 mother wavelet. A summation, point by point, was performed on the processed signals, in order to suppress noise...

2007
Douglas Cochran

This paper presents a generalization of the continuous wavelet transform to higher dimensions. This generalization includes previous higher dimensional generalizations as special cases, without the loss of the elegance of the one-dimensional equations. One noteworthy special case is a transform that is closely related to the cortex transform developed by Watson. This special case rmly relates t...

2004
Daniel Rudoy

This paper is concerned with the group-theoretical background of integral transforms and the role they play in signal processing on the sphere. An overview of topological groups, measure and representation theories, and an overview of the Windowed Fourier Transform and the Continuous Wavelet Transform are presented. A group-theoretical framework within which these transforms arise is presented....

1995
J. A. Hogan J. D. Lakey

Two standard tools for signal analysis are the short{time Fourier transform and the continuous wavelet transform. These tools arise as matrix coeecients of square integrable representations of the Heisenberg and aane groups respectively, and discrete frame decompositions of L 2 arise from approximations of corresponding reproducing formulae. Here we study two groups, the so-called aane Weyl-Hei...

1997
G. Van de Wouwer P. Vautrot P. Scheunders S. Livens D. Van Dyck N. Bonnet

A successful class of texture analysis methods is based on multiresolution decompositions. Especially Gabor lters have extensively been used [1] [2] [3] [4] [5] [6]. More recently, decompositions with pyramidal and tree structured wavelet transforms have been proposed [7] [8] [9] [10]. An important aspect is the rotation invariance of the features. A discrete wavelet transform does not provide ...

2015
Qiao Wang Yue Liu

In view of the existing seismic signal analysis model there are some problems is Analysis of the result is bad, the accuracy is not high. This paper puts forward an algorithm based on discrete wavelet and generalized the ICA model of seismic signal analysis. First for continuous Wavelet transform exists redundant of problem, on standard small wave transform algorithm of transform domain in the ...

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