نتایج جستجو برای: continuous wavelet transform

تعداد نتایج: 391819  

Journal: :Signal, Image and Video Processing 2015
Erdal Dinç Fernando B. Duarte José António Tenreiro Machado Dumitru Baleanu

In this paper, the fractional Fourier transform (FrFT) is applied to the spectral bands of two component mixture containing oxfendazole and oxyclozanide to provide the multicomponent quantitative prediction of the related substances. With this aim in mind, the modulus of FrFT spectral bands are processed by the continuous Mexican Hat family of wavelets, being denoted by MEXH-CWTMOFrFT. Four mod...

2014
Tomohiko Nakamura Hirokazu Kameoka

The continuous wavelet transform (CWT) can be seen as a filterbank having logarithmic frequency subbands spacing similar to the human auditory system. Thus, to make computers imitate the significant functions of the human auditory system, one promising approach would be to model, analyze and process magnitude spectrograms given by the CWT. To realize this approach, we must be able to convert a ...

2005
Zhaoyang Wang Huanfeng Ma

An advanced continuous wavelet transform technique has been developed to automatically analyze photomechanics interferograms. This technique utilizes all possible wavelets to match the local interferogram fringes, and it can automatically detect local fringe frequencies and orientations with high accuracies. The advanced wavelet transform technique has the capability to directly determine gradi...

Journal: :Technometrics 2001
Michael R. Chernick

• wavelets are analysis tools for time series and images • as a subject, wavelets are − relatively new (1983 to present) − a synthesis of old/new ideas − keyword in 29, 826+ articles and books since 1989 (4032 more since 2005: an inundation of material!!!) • broadly speaking, there have been two waves of wavelets − continuous wavelet transform (1983 and on) − discrete wavelet transform (1988 an...

Journal: :international journal of civil engineering 0
r. abbasnia tehran, iran a. farsaei tehran, iran

corrosion of reinforcing steel and other embedded metals is the main cause of severe deterioration in reinforced concrete structures which subsequently imposes adverse effects on ultimate and serviceability limit state performance of the whole structure. in this paper, a new corrosion detection method for reinforced concrete beams, based on wavelet analysis is presented. to evaluate the capabil...

2017
Shing Doong Daniel Chung

Viral hashtags spread across a large population of Internet users very quickly. Previous studies use features mostly in an aggregate sense to predict the popularity of hashtags, for example, the total number of hyperlinks in early tweets adopting a tag. Since each tweet is time stamped, many aggregate features can be decomposed into fine-grained time series such as a series of numbers of hyperl...

2004

Although the discretized continuous wavelet transform enables the computation of the continuous wavelet transform by computers, it is not a true discrete transform. As a matter of fact, the wavelet series is simply a sampled version of the CWT, and the information it provides is highly redundant as far as the reconstruction of the signal is concerned. This redundancy, on the other hand, require...

Journal: :Knowl.-Based Syst. 2013
Yihui Liu Uwe Aickelin Jan Feyereisl Lindy Durrant

Biomarkers which predict patient’s survival can play an important role in medical diagnosis and treatment. How to select the significant biomarkers from hundreds of protein markers is a key step in survival analysis. In this paper a novel method is proposed to detect the prognostic biomarkers of survival in colorectal cancer patients using wavelet analysis, genetic algorithm, and Bayes classifi...

Journal: :IEEE Trans. Communications 1999
Ravi Narasimhan Donald C. Cox

A new technique is described for estimating the speed of a mobile station in a wireless system. The mobile speed maps the characteristic spatial scale of the received signal into a characteristic temporal scale. The continuous wavelet transform tracks changes in the temporal scale to estimate the mobile speed as a function of time. This technique requires neither knowledge of the average receiv...

Journal: :Parallel Processing Letters 1999
Manfred Feil Andreas Uhl Marián Vajtersic

Received (received date) Revised (revised date) Communicated by (Name of Editor) ABSTRACT Strategies for computing the continuous wavelet transform on massively parallel SIMD arrays are introduced and discussed. The diierent approaches are theoretically assessed and the results of implementations on a MasPar MP-2 are compared.

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