Converging fields of view

[P3D Neil Harrington <nharrington@xxxxxxxxxxxxx>]

Gregg Podnar writes:

>Our group has been using the term "coincident" to describe the plane segment
>where both fields of view see exactly the same points.  

Sure.  That's what the fields of view are--but at the window only.

>The term "convergence"
>is misleading.  

Why?  The field of view for the left frame starts out entirely on the left,
that for the right on the right, and with increasing distance the two fields
of view move toward each other until they become coincident at the window
distance.  That's convergence.  Why is it "misleading" to call convergence
"convergence?"

>The most recent video camera we built has one adjustment for
>focus, and one for coincidence.  In effect, one could say that the coincidence
>adjustment "sets the stereo window".  (I will not discuss lens
>distortions.)                                                  Gregg

How is the adjustment done that "sets the stereo window"?  If you have some
method _other_ than converging the fields of view, I'd sure like to know
what it is.  Seriously.



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