| Re: Frame Grabber Support? [message #7305] |
Sun, 03 November 1996 00:00 |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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In article <327A8E89.7B5@rit.edu>, Tuo Wu <txw8826@rit.edu> writes:
> Hi,everybody,
>
> I am a new comer in the world of IDL. I have just taken a research
> project which requries capturing RGB images from a 3-CCD camera using a
> Oculus TCX frame grabber (2 MB TCX, 1024x512 / 1x24 bits). Since all the
> following image processing and analysis will be done in IDL, it would be
> best to use IDL from very beginning. The technical support of Research
> System has informed me that there is no such interface in IDL to support
> any frame grabber. I wonder anyone here can help me out with this
> matter, either providing an interface for IDL to support the frame
> grabber, or let me know which RGB frame grabber (at least 2 MB/1x24
> bits) can be supported by IDL.
There are 2 ways to support a frame grabber in IDL, and I have done both.
1) You can write a true IDL device driver for it. To do so requires that you
obtain a copy of the IDL Internals Manual. The advantage of writing a true
device driver is that you can use all of the standard IDL graphics and
imaging routines (PLOT, TV, TVRD, TVLCT, XYOUTS, etc.) to do output and
input from the device. The disadvantage is that it is a bit of work. Also,
with IDL 5.0 about to be released, I think the graphics interface will
completely change, and you will have work to do to make your driver work
with the new version.
2) You can simply use CALL_EXTERNAL to do the operations you want to do with
the device. You take the library of routines which the frame grabber
manufacturer probably provided with it, make a thin wrapper layer so the
routines can be called from IDL with CALL_EXTERNAL, make some simple IDL
routines which do the CALL_EXTERNAL, and you are done.
____________________________________________________________
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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