To: Color and Vision Network <cvnet@lawton.ewind.com>,
Greg DeAngelis <gregd@cabernet.wustl.edu>
From: David Coombs <david.coombs@nist.gov>
Subject: Re: CVNet - query on projectors for stereo
Greg,
I recently needed to repair the electrohome CRT-based projector in
our stereo projection system. Before we committed, I tried to
determine if any other projector technology would work. I talked
with projector sales reps, etc. Everyone said that only the CRTs
could handle the refresh rates. (We're running 96 Hz field rates to
achieve 48 Hz per eye. That's 77kHz Horizontal. Our resolution is
lower than others I know of: their requirements for CRT rates are
thus even higher.)
LCDs would fall behind, I was told, and the wrong image (or maybe
just pixels) would be presented to the eye.
As far as I know, we're stuck with CRTs for now. If you find
otherwise, please update us.
best regards,
dave
At 1:00 AM -0800 1/4/00, Color and Vision Network wrote:
>From: Greg DeAngelis <gregd@cabernet.wustl.edu>
>To: cvnet@lawton.ewind.com
>Subject: Query about projectors for stereo
>
>Hi,
> I am looking to buy a video projector to generate large-field
>stereoscopic displays using frame alternation. The 3-chip DLP projectors
>seem ideal (bright, no persistence, all optical), but are very large and
>expensive (>$50k). I guess that a 1-chip DLP projector would work if I
>removed the color wheel, but these projectors seldom have refresh rates
>above 60Hz. I think (but am not certain) that LCD projectors would not
>work well because they are slow (long equivalent persistence).
> If anyone has any experience to share or advice about which way to
>go, I would most appreciate hearing about it.
>
>Thanks,
>Greg DeAngelis
David Coombs, PhD Tel: 301-975-2865
NIST Intelligent Systems Div FAX: 301-990-9688
MET B-124
100 Bureau Dr Stop 8230 mailto:coombs@nist.gov
Gaithersburg MD 20899-8230 http://www.isd.mel.nist.gov/personnel/coombs
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