Flicker Perception

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

While doing some stereo editing I noticed a curious phenomenon related to
LCS glasses. Remember they alternate left and right sequentially. With my
screen resolution at 1024 x 768, the maximum vertical refresh for my monitor
is 75 Hz. Stereo images viewed at that resolution have noticable flicker,
though it can be ignored.

The observation was made while attempting to freeview an image pair in the
image editor (not stereo mode) while still wearing the goggles. During the
moments that my eyes dissassociate with direct 2D viewing of the screen, and
seek the point where the stereo recombines forming a fusion lock for the
vision process, the alternate nature of the flickering goggles becomes
directly observable. I literally feel the back and forth switching. As soon
as my eyes lock onto the stereo pair, this awareness goes away.

Startled, I tried it several times. Each time, while my eyes aren't seeing
and locked onto similar data, I can *see* the glasses alternating back and
forth quite clearly. (perhaps the only consistently observable phenomena
available to see?)  It goes away with any image fusion whether 2D or stereo
viewing though the images being fused are themselves still alternating
because of the glasses.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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End of PHOTO-3D Digest 2198
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