| Framegrabber [message #9591] |
Fri, 25 July 1997 00:00  |
Armand J. L. Jongen
Messages: 9
Registered: April 1997
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Junior Member |
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I am looking for a framegrabber at the moment to port through the
videosignal of a CCD-camera to IDL. Does anyone have experience on
writing the intermediate DLL for a certain type of framegrabber?
I would appreciate any suggestions that can keep me from having to write
my own C-programmes :-)
Thanks,
--
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Armand Jongen Academic Medical Centre
Laser Centre
Phone +31-20-5667418 \\||||// Meibergdreef 9
Fax +31-20-6975594 | ~ ~ | 1105 AZ Amsterdam
E-mail a.j.jongen@amc.uva.nl [| o o |] The Netherlands
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| Re: framegrabber [message #15111 is a reply to message #9591] |
Tue, 20 April 1999 00:00  |
David G. Grier
Messages: 8
Registered: September 1997
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Junior Member |
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Gunnar Hedin wrote:
> I would like to read in picture directly from a framgrabber into IDL,
> for direct processing of the images. I my opionon this can't be the
> most unlikely usage of IDL and I therefore wonder if there is
> anyone who has already done this and who would like to enlighten
> me in the do and don't and if possible send some code.
>
> I have no specific framegrabber card in mind and I'm eager
> to here if any suggest of what kind to choose.
I've had success with both the Matrox Meteor and the MuTech
MV-1000running under Linux on an Intel machine. In both cases, I wrote
IDL-callable
C libraries to control the framegrabbers and used CALL_EXTERNAL to
communicate
with the libraries. This worked well enough that I never bothered to
delve into
the possibilities of LINK_IMAGE. It's best to allocate a BYTEARR for
the image in
IDL and pass the pointer to C to get the data. That way you take
advantage of
IDL's memory allocation machinery. The examples in the directory
/usr/local/rsi/idl/external/call_external/
got me started under IDL 5.2. They may be elsewhere on your system.
In short, if you can write command line programs for the framegrabber
(or GPIB, or
any other equipment) in C, running it from IDL is straightforward.
Best regards,
David
--
============================================================ =============
David G. Grier (773) 702-9176 (voice)
Dept. of Physics and James Franck Institute (773) 702-5863 (FAX)
The University of Chicago grier@fafnir.uchicago.edu
5640 S. Ellis Ave
Chicago, IL 60637 http://rainbow.uchicago.edu/~grier/
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