P3D Cyclopean Image

[Ray Zone <r3dzone@xxxxxxxxxxxxx>]

Robert A. Schreiber and Ron Labbe wrote:

>I hate to be the one to point out the obvious, but all our so-called 3d
>cameras take two TWO-D images, on FLAT film.  We are not holographers.  We
>are just using a trick to make it APPEAR three-D.  <

>Excuse me? Since when is a hologram actually three dimensional? It's on very
>flat film last time I looked. It's understood that stereo3D is the ILLUSION
>of three dimensions, by somehow channeling disparate images to each eye.

The perception of 3-D is a wonderful and (still) mysterious thing.  From
the two slightly different (xy) or 'flat' left and right eye images the
brain synthesizes the cyclopean 3-D image loaded with depth information.
The cyclopean 3-D visual field
is  a perceptual construct created in the brain and hence, you might say,
an illusion.  This dynamic is the same whether the 3-D display is a
stereoscope, a viewmaster, an anaglyph or a hologram.  Stereoscopic
perception is made in the brain where it is completed as a perceptual
construct from cerebral processing of parallax difference information
between the two visual sets.

The mystery may be expressed thus:  xy + xy = xyz.  A recent posting by
Larry Berlin regarding 3-D information processing is very much to the
point.  As is Dr T's reference to Don Peck's work cited in the new issue of
The Stereogram.  Peck's work actually builds upon the fundamental discovery
of Bela Julesz of "Cyclopean Perception" from his book of the same name
published in 1974 by University of Chicago Press.  Julesz discovered the
"Random Dot Stereogram" and included examples as stereo pairs and anaglyphs
in his book (as well as an article which preceded it in an issue of
Scientific American).

---Ray Zone

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