P3D Re: Pulfrich and one-eyed depth perception

[Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Wed, 31 Dec 1997
>From: Michael _ Kaplan writes:
>................. Some while back, I posted
>results of informal experiments I had done viewing lenticular prints with
>only one eye. By rotating the prints along a vertical axis and delivering
>L and R images sequentially to only one eye, the brain (at least, *my*
>brain) could assemble a 3-D image with full depth. 

****  So reading, I grabbed the most recent batch of lenticulars...

It seems to work for me too. I get a developed sense of depth, but it's not
stereo... Stereo imparts the depth and something more that is a synthesis of
both eye's vision as well as the differences therein.

>Whether this is a
>learned rather than unconscious operation, I don't know. However, I
>suspect Pulfrich was fully able to see his "effect," and referred to his
>assistants only for confirmation of what he was seeing with one eye. 

****  We seem to agree about Pulfich... wonder if there is any way to verify
specifics?

>And I
>also suspect viewers could be trained to see horizontal-scan shots
>3-dimensionally *without* the Pulfrich glasses. 2 years ago I mentioned
>*almost* being able to do this while watching IMAX HD (48 fps). 
>

***  With the presence of page flipped stereo, at various rates, and
interlaced 3D in video, I've had numerous opportunities to view stereo
material without use of the LCS glasses, or any other device. I've often
asked myself if I can see the depth in the cyclic patterns created by
parallax. The answer? Sort of. It's uniquely different from stereo vision,
but the interpretation of depth is possible. It seems to work better at the
slower speeds and seems heightened by the flicker effect. I've seen at least
one cyclic image on the internet that might have been done in QTime, that
alternated between L and R at some relatively slow rate, compared to LCS
flicker rates... It gave a reasonable sense of depth, but again wasn't quite
stereo.

It seems that the mind is capable of extracting sophisticated subsets of our
visual environment and correctly interpreting it. That facility can be
stimulated by program content in a variety of ways...

3D exploration and exploitation...

or 3D tools will continue to influence 2D programming content... improving
along with the tools.

Larry Berlin

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


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