NDLI: Bayesian wavelet-based signal estimation using non-informative priors

Content Provider	IEEE Xplore Digital Library
Author	Figueiredo, M.A.T. Nowak, R.D.
Copyright Year	1998
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Inst. Superior Tecnico, Lisbon, Portugal (Figueiredo, M.A.T.)
Abstract	The sparseness and decorrelation properties of the discrete wavelet transform have been exploited to develop powerful signal denoising methods. Most existing schemes involve arbitrary thresholding nonlinearities and ad hoc threshold levels, or computationally expensive signal-adaptive procedures. Furthermore, because the DWT is not a translation-invariant (TI) transform, results of processing depend on the relative alignment between data and wavelets in a complicated manner. In the context of denoising, this non-stationarity can produce undesirable ("pseudo-Gibbs" or "blocking") artifacts. To overcome these deficiencies, we propose a new wavelet-based signal denoising technique derived using the theory of non-informative Bayesian priors. The resulting estimator is TI and employs a very simple fixed non-linear shrinkage/thresholding rule. Remarkably, our new approach is very computationally efficient and performs better than standard methods that are more computationally demanding.
Starting Page	1368
Ending Page	1373
File Size	599698
Page Count	6
File Format	PDF
ISBN	0780351487
ISSN	10586393
DOI	10.1109/ACSSC.1998.751550
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-11-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bayesian methods Estimation Discrete wavelet transforms Noise reduction Decorrelation Signal processing Power engineering computing Telecommunication computing Power engineering and energy Signal denoising
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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