| Re: wavelet software for idl [message #4952] |
Thu, 07 September 1995 00:00 |
hahn
Messages: 108
Registered: November 1993
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Senior Member |
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kspencer@s.psych.uiuc.edu (Kevin Spencer) wrote:
> Wavelet routines, from Numerical Recipes in C, were incorporated in
> IDL 3.6. I haven't installed IDL 4.0 yet, but I'm sure they're there --
> look in the "Numerical Recipes" part of the online help.
Heureka!
The function is now called WTN. Usage is similar to FFT. The new
algorithm may optionally use double precision.
Thanks
Norbert
> -----------------------------------------------------------
> Kevin Spencer
> Cognitive Psychophysiology Laboratory and Beckman Institute
> University of Illinois at Urbana-Champaign
> kspencer@p300.cpl.uiuc.edu / kspencer@psych.uiuc.edu
> -----------------------------------------------------------
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| Re: wavelet software for idl [message #4954 is a reply to message #4952] |
Thu, 07 September 1995 00:00  |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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In article <42ljh7$7eq@vixen.cso.uiuc.edu>, kspencer@s.psych.uiuc.edu (Kevin Spencer) writes:
> Wavelet routines, from Numerical Recipes in C, were incorporated in
> IDL 3.6. I haven't installed IDL 4.0 yet, but I'm sure they're there --
> look in the "Numerical Recipes" part of the online help.
In IDL 4.0.1 the function is WTN(), wavelet transform. This is a built-in
(i.e. non-library) routine. There is also /lib/obsolete/nr_wtn.pro, which is
written in IDL.
____________________________________________________________
Mark Rivers (312) 702-2279 (office)
CARS (312) 702-9951 (secretary)
Univ. of Chicago (312) 702-5454 (FAX)
5640 S. Ellis Ave. (708) 922-0499 (home)
Chicago, IL 60637 rivers@cars3.uchicago.edu (Internet)
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| Re: wavelet software for idl [message #4958 is a reply to message #4952] |
Thu, 07 September 1995 00:00 |
agraps
Messages: 35
Registered: September 1994
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Member |
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hahn@hrz.th-darmstadt.de (Norbert Hahn) writes:
> I've read that some time ago that the wavelet transformation
> has been patended in the U.S. and is about to replace JPEG
> (and MPEG) in the near future. If that were the case I think we
> will no longer find a wavelet program in IDL. Any ideas on that ?
Do you remember where you read that? I'm finding it really hard
to believe. The wavelet transform, wavelet packet transform, etc.
are in use all through the sciences. There is currently alot
of wavelet software out there (see my wavelet page at
http://www.amara.com/current/wavelet.html).
There are elements in the wavelet field that are being patented. I
know that some folks at Yale are applying for a patent on the best
basis algorithm for selecting wavelet packets.
Replacing JPEG and MPEG with wavelets is a good idea. It's more
robust and handles signal degradation alot better.
Amara
--
************************************************************ **********
Amara Graps email: agraps@netcom.com
Computational Physics vita: finger agraps@sunshine.arc.nasa.gov
Multiplex Answers URL: http://www.amara.com/
************************************************************ ***********
"That's the whole problem with science. You've got a bunch of empiricists
trying to describe things of unimaginable wonder." - Calvin (& Hobbes)
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| Re: wavelet software for idl [message #4959 is a reply to message #4952] |
Thu, 07 September 1995 00:00 |
kspencer
Messages: 21
Registered: December 1993
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Junior Member |
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Wavelet routines, from Numerical Recipes in C, were incorporated in
IDL 3.6. I haven't installed IDL 4.0 yet, but I'm sure they're there --
look in the "Numerical Recipes" part of the online help.
-----------------------------------------------------------
Kevin Spencer
Cognitive Psychophysiology Laboratory and Beckman Institute
University of Illinois at Urbana-Champaign
kspencer@p300.cpl.uiuc.edu / kspencer@psych.uiuc.edu
-----------------------------------------------------------
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| Re: wavelet software for idl [message #4960 is a reply to message #4952] |
Wed, 06 September 1995 00:00 |
hahn
Messages: 108
Registered: November 1993
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Senior Member |
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"Christian Oehreneder (PHOTO-Dissertand)" <coehrene> wrote:
> Schalom!
> I need wavelet software for IDL. Who knows where i can get it?
> Thanks in advace
> Chris
Version 3.6.1 of IDL has lib/demo/lib/xdemo/wvlttool.pro
a demo program for wavelet transformation. However,
I couldn't find this program in version 4.0 of IDL. What did
I overlook ?
I've read that some time ago that the wavelet transformation
has been patended in the U.S. and is about to replace JPEG
(and MPEG) in the near future. If that were the case I think we
will no longer find a wavelet program in IDL. Any ideas on that ?
Norbert Hahn
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