T3D Re: stereo math

[john bercovitz <bercov@xxxxxxxxxxx>]

Abram, loved your gedanken experiment!  

This may be a red herring but I would be most gratified for 
your comments on a closely-related subject.  I have made 
interesting (to me at least) graphs which are on the calcite
3D web site at:

http://calcite.rocky.edu/ftpdir/photo/photo-3d/SL3D/

convscar.gif shows the geometric setup for what I call the
"conventional" approach, much like your torch, and also the
geometric setup that Bill Carter (also of this list) uses.
llp.gif shows the results of the two approaches plotted on
the same graph.  The inputs to the two were made alike and
the outputs are remarkably similar right up to the very end
where they diverge.  I am wondering if you have ever seen
such an approach as Carter's and whether you can think of a 
physical justification for it.  I'm not much for coincidences 
8-) so although I do not see a physical basis for Carter's 
approach, I am fascinated that it mimics the conventional 
approach so closely.

For background, Carter is the inventor of a class of single 
lens stereo equipment which is used in the medical field.

I am still reading your article but your experiment exhumed
these old questions.  I should be able to finish it over the
weekend.

Thanks,
John B


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