Re: Indigo Extreme II and Crystal Eyes

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Jim Helman (jimh++at++surreal)
Fri, 16 Dec 94 16:49:40 -0800

> Now for my first question, we have a set of CrystalEyes and when we run the
> application in stereographic mode there appears to be some minor bleeding of
> the right image in the left eye and vice versa. Is there some way to correct
> this?

A number of things can conspire to cause this: 1) phosphor decay times
(some green phosphors are especially bad), 2) LCD shutter extinction
ratio (this tends to be particularly an issue near the edges of the
LCD), 3) LCD shutter transition times.

Most monitor phosphors are fast enough that #1 is not a problem
(although for video projection tubes with a special green phosphor are
available and do make a difference). I believe the largest problem
with desktop stereo is usually #2. From what I've seen, the large
polarization shutters that sit in front of the screen (like Tektronix)
tend to have better extinction ratios and less ghosting than shutter
glasses, but they are considerably more expensive for single-viewer
use.

While not addressing the fundamental problem, using a background with
less contrast (e.g. gray instead of black) may reduce the percieved
severity of the ghosting.

rgds,

-jim helman

jimh++at++surreal.asd.sgi.com
415/390-1151

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