Article View: sci.image.processing
Article #235Re: image restoration
From: Stan Reeves
Date: Wed, 29 Jul 1992 19:29
Date: Wed, 29 Jul 1992 19:29
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1538 bytes
In article <ALIEN.92Jul28092012@vulcan.essex.ac.uk> alien@essex.ac.uk ("Adrian F Clark") writes:
>Note that cepstral filtering will result in ringing at sharp edges
>(after all, you will be throwing away the high frequencies). To do
>any better than this, you have to go to non-linear techniques such as
>maximum entropy (MEM) or maximum _a posteriori_ (MAP).
Not necessarily. See
@article{lagendijk88,
TITLE = "Regularized Iterative Image Restoration with Ringing Reduction",
AUTHOR = "R. L. Lagendijk and J. Biemond and D. E. Boekee",
JOURNAL = "IEEE Transactions on Acoustics, Speech, and Signal Processing",
YEAR = "1988",
VOLUME = "36",
NUMBER = "12",
PAGES = "1874-1888",
MONTH = "Dec."}
for a method that uses space-variant linear techniques to avoid ringing.
It's quite powerful and works well.
--
Stan Reeves
Auburn University, Department of Electrical Engineering, Auburn, AL 36849
INTERNET: sjreeves@eng.auburn.edu
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Newsgroups: sci.image.processing Path: arc1-ca.pugleaf.net!sparky!uunet!darwin.sura.net!news.duc.auburn.edu!eng.auburn.edu!sjreeves From: sjreeves@eng.auburn.edu (Stan Reeves) Subject: Re: image restoration Message-ID: <sjreeves.920729142934@fourier.ee.eng.auburn.edu> Sender: usenet@news.duc.auburn.edu (News Account) Nntp-Posting-Host: fourier.ee.eng.auburn.edu Organization: Auburn University Engineering References: <1992Jul24.105328.1@ntuvax.ntu.ac.sg> <ALIEN.92Jul28092012@vulcan.essex.ac.uk> Date: Wed, 29 Jul 1992 19:29:35 GMT Lines: 27