Re: Depth reconstruction in freeviewed images

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 6:26 AM -0800 2/4/97, P3D wrote:
>
>What I *was* able to determine, however, is that the light source that
>I used when I made my initial observation was somewhat inadequate, and
>may have caused a condition similar to the "low-res" situation John B
>suggests.

Definitely!  At low light levels the number of photons available is the
limiting factor to acuity...regular acuity anyway, but I wouldn't be
surprised if it was true for stereoacuity as well...

>
>Incidentally, with the bright light source, moving father away from the
>slide (within my limited range of focus without my glasses) clearly has
>a dramatic impact on the stretch, as John B indicated it would.  This
>stretch effect appears far more than what woule be predicted by a linear
>relationship if 200mm freeview distance is equivalent to 4 times the FL
>of the approx 50mm lenses of the $3 viewer.  That is, the stretch effect
>is far more dramatic with a 50% to 100% increase of FV distance than it
>is in a supposed 300% increase from 50mm viewer FL to 200mm FV distance.

Are you free-viewing cross- or wall-eyed?  If wall-eyed, then I'd guess it
is the removal of the lens...

-Jim C.

----------------------
Jim Crowell
Division of Biology
216-76
Caltech
Pasadena, CA
(818) 395-8337
jim@xxxxxxxxxxxxxxx



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