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From: gsh7w@astsun9.astro.Virginia.EDU (Greg Hennessy)
Newsgroups: comp.lang.idl-pvwave
Subject: Cubic interpolations
Message-ID: <1991Mar18.062824.10741@murdoch.acc.Virginia.EDU>
Date: 18 Mar 91 06:28:24 GMT
Sender: usenet@murdoch.acc.Virginia.EDU
Organization: University of Virginia
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I am posting this for a friend who is currently without acces to
usenet. I will forward any posted reply, or e-mail replies. The person
has their e-mail at the end.

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I am looking for an IDL procedure, or a FORTRAN or C program that
can be linked to IDL, which would rotate images using a cubic
interpolation algorithm.   More generally, I would be looking for
an emulation of POLY_2D that would include a cubic interpolation option.

Our group has found (using a mainframe) that rotation with cubic
interpolation significantly reduces the smearing that can occur when
using the bilinear algorithm.    There is, of course, a significant
increase in computation time, but workstations are now powerful enough
that this can be an interactive option.


Wayne Landsman
ST Systems Co.
landsman@stars.gsfc.nasa.gov           (Internet)
6170:::LANDSMAN                        (SPAN)

(301) - 286 - 3625

--
-Greg Hennessy, University of Virginia
 USPS Mail:     Astronomy Department, Charlottesville, VA 22903-2475 USA
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