T3D Re: Re stereo math

[Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 8:46 AM -0700 9/16/98, aij.klooswyk@xxxxxxxxx wrote:
>
>Jim Crowell wrote:
>>Actually, it's a function of the fusional range of the visual system,
>>i.e. the amount of disparity (difference in position of a feature
>>between the two eyes' images) that the brain can merge into a single
>>image.
>>(..) To oversimplify  :-).
>>(...) As I think Boris pointed out on that other list, it may also be
>>affected by the magnitude of the disparity gradient.
>
>Oversimplification can hardly be avoided in necessary short postings.:-)
>"Fusional range of the visual system" seems just a longer way to say:
>viewable.

No, there are other things that contribute to viewability.

>I'm sure Jim Crowell could tell us more about the
>convergence-accommodation relation or about accommodation induced
>convergence, which contribute to the system he mentions.

Not quite sure what you mean here.  You're referring to the fact that
accommodation (human eye lens focal length) and convergence are yoked, such
that mis-matches can lead to eyestrain.  This is another factor that can
hurt viewability, though I think it's typically a minor one for hand-held
viewers.  Where it really gets to be a problem is in an Imax theater, where
they've got you converging maybe 3-4 feet away at times & accommodating
near infinity.  I have yet to leave an Imax film without a splitting
headache (though some of that comes from the weight of the headset).

>But who is Boris?

Boris Starosta, an artist (mainly computer-generated & nude-photo stereo
pairs). (http://www.starosta.com/)

-Jim C.
----------------------
Jim Crowell
Caltech Division of Biology
Mail Code 216-76
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Pasadena, CA 91125
Tel: (626) 395-8337
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jim@xxxxxxxxxxxxxxx
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