Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ulowell!masscomp!garyo
From: garyo@masscomp.UUCP (Gary Oberbrunner)
Newsgroups: comp.graphics
Subject: Re: How to view Superbowl 3-D
Keywords: TV 3-D graphic
Message-ID: <466@masscomp.UUCP>
Date: 27 Jan 89 21:46:07 GMT
References: <3230@datapg.MN.ORG> <3047@pixar.UUCP> <41153818.16321@apollo.COM>
Reply-To: garyo@masscomp.UUCP (Gary Oberbrunner)
Distribution: na
Organization: MASSCOMP - Westford, Ma
Lines: 38

In article <41153818.16321@apollo.COM> ron_b@apollo.COM (Ronald Buttiglieri) writes:
:
:With (or without, just use a dark lens on the "trailing eye") the 3-D
:glasses, other TV shows can produce a similar effect. Try it. Again, 
:the horizontal motion is the real key.
:
:Ron

After hearing the psychophysical explanation, I thought that they must
be broadcasting two distinct images, one darker than the other, and
delayed by a single frame time.  The dark one (the earlier one) gets
percieved only by the unfiltered eye, since it's too dark to be seen by
the filtered eye.  The bright one (the later one) gets perceived by
both eyes, but the filtered eye has already "made up its mind," as it
were, about the image content.  This is similar to acoustic attack
perception - for localization, it doesn't much matter what comes after
the initial attack/image.

Thus the two eyes perceive two different images, which I assumed were
generated by two cameras with the usual stereo separation.  This
technique, as far as I can tell, does not require the source to move in
any direction, and it could even be stationary.  I figured that the
computer graphics they showed were just twirling to heighten the 3-d
effect.

I assumed that this was why the effect was vastly more pronounced on
the actual "3-d" commercials than on the normal ones; after all normal
commercials have lots of motion too.

Am I way off base here?  I really don't know *how* they actually did
it, this just seemed like the obvious thing to me after hearing that
the glasses were simply light/dark.

-- 
Remember,			Truth is not beauty;      (617)692-6200x2445
Information is not knowledge;	Beauty is not love;	  Gary   Oberbrunner
Knowledge is not wisdom;	Love is not music;	  ...!masscomp!garyo
Wisdom is not truth;		Music is the best. - FZ   ....garyo@masscomp