P3D Re: 3-DVG Effect

[Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

> Date: Mon, 2 Nov 1998 09:56:23 MST7MDT
> From: "KENNETH LUKER" <kluker@xxxxxxxxxxxxxxxxxxxxxxx>
> To: photo-3d@xxxxxxxxxxxxxxxxx
> Subject: P3D Re: 3-DVG Effect
> Message-ID: <2886AC42C3C@xxxxxxxxxxxxxxxxxxxxxxx>
>
>
> > I think the operative word here is EFFECT. Not true Stereo, but an optical
> > illusion, I think this is another example. You think you see stereo but it
> > has to be something else entirely.
>
>      I believe it CANNOT be true stereo, since there is nothing seen
> by either eye that cannot be seen also by the other.  There is just
> no stereo information there.  Yet those who have experienced the

Actually, this is incorrect.  Differences in the images are introduced by
chromatic aberration in the ocular lenses (coupled with the fact that the
pinholes have been moved off of the optic axes of the eyes).  The image
disparities introduced are a function of wavelength & hence are generally
not geometrically correct for the scene being viewed (they're also fairly
small), but they _are_ real.

-Jim C.

-------------------------------------
Jim Crowell
Caltech Division of Biology
Mail Code 216-76
1200 E. California Blvd.
Pasadena, CA 91125
mailto:jim@xxxxxxxxxxxxxxx
http://vis.caltech.edu/~jim/Home.html


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