Re: Nimslo Prints vs Slides

[crowell@xxxxxxxxxxxxxxxxx (Jim Crowell)]

At 1:13 PM 2/28/96, John Bercovitz wrote:

>> Tsk, tsk, John; this is geometry, _not_ perception!
>
>I think to the first order, perception must follow geometry.
>I see the aspect of perception you're probably talking about
>as being that which fixes up the problems which come from
>ambiguous, incomplete, and/or contradictory geometry.
>

Reasonable, but this is a situation in which there are
conflicting cues about the distances to the objects being
viewed, & since the interpretation of binocular disparity
logically depends on viewing distance, it follows that the
stereo information for shape is ambiguous.

>
>I guess that's perception at work.  Most people see enlarged
>objects if the pair is shot with a reduced baseline.  This is
>the basis of the sport called "hypostereo".  Most people see
>stretched objects if the viewpoint is too far from the prints.
>

What's your basis for saying "most people"?  I find that most
people find 3DMagic prints to look flat, but then of course I
haven't controlled for disparities going sub-threshold...

-Jim C.


------------------------------------------------
Jim Crowell
U.C. Berkeley School of Optometry
360 Minor Hall, Berkeley, CA 94720
(510) 642-7679
jim@xxxxxxxxxxxxxxxxx



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