Hi Koen,
On Thu, 2010-10-14 at 10:18 +0200, koen buys wrote:
> >> > Next on my list is getting two GC1020s to work in a stereo setup. I
> >> > don't know when I'll get around to that yet, though.
> >>
> >> Here I believe that your main problem will be getting the timestamps
> >> from the two cameras to exactly match. I have heard that there is a
> >> node to do this, but am not sure off-hand what it is called. It is on
> >> a non-WG repo.
> >
> > I vaguely remember this being mentioned on the mailing list now. I'll
> > check the archives later today.
> >
>
> If you found it, could you post the topic?
I think this is the message I remembered:
http://code.ros.org/lurker/message/20101007.133812.c45bb049.en.html
I haven't looked at the code yet, though.
> We are currently doing a similar setup, the camera's are configured to
> be triggered
> externally or one triggers the other, but still the timing doesn't match, the
> images do match.
I wouldn't expect the timestamps to match exactly. We typically see
timestamp differences of about 10-200 microseconds with both GC1020s
connected via dedicated GigE cards and one realtime thread per camera on
a quadcore machine (using our own software framework).
> I'm interested in collaborating in a joint package setup.
Supposedly, the easiest way to get a working setup is to have an
intermediary node assign the earlier of the two timestamps to both
frames (assuming that frame correspondence is known). A more
sophisticated approach would involve some sort of external observation
of latencies and/or filtering on the timestamps.
Cheers,
Rene
--
------------------------------------------------------------
Dipl.-Inf. René Wagner Junior Researcher
DFKI Bremen Enrique-Schmidt-Str. 5
Safe and Secure Cognitive Systems D-28359 Bremen
Phone: (+49) 421-218-64224 Fax: (+49) 421-218-98-64224
Web: http://www.informatik.uni-bremen.de/agebv/en/ReneWagner
--- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
Deutsches Forschungszentrum für Künstliche Intelligenz GmbH
Firmensitz: Trippstadter Strasse 122, D-67663 Kaiserslautern
Geschäftsführung:
Prof. Dr. Dr. h.c. mult. Wolfgang Wahlster (Vorsitzender)
Dr. Walter Olthoff
Vorsitzender des Aufsichtsrats:
Prof. Dr. h.c. Hans A. Aukes
Amtsgericht Kaiserslautern HRB 2313
------------------------------------------------------------
(text/plain)