P3D Re: Realist mounting and the "stereo window"

[fj834@xxxxxxxxxxxxxxxxxxxxx (Dr. George A. Themelis)]

>> >Could someone define for me what the stereo window is, exactly?
>> "Exactly"?  No.  There is no mathematical definition.
>Well, actually there is.  Charles Piper provides a mathematical
>formula for the perceived location of the stereo window.... [...]

Yes, indeed... simple geometry can be used to reproduce 3-d space and
reconstruct the stereo window (and formulas are derived from the geometry.)

Anyone so inclined should be encouraged to work out the appropriate
geometry which will lead in a deeper understanding of the concept of the
stereo window.  (Same applies to a number of photographic
formulas/situations, like depth of field/hyperfocal distance, etc.)

One problem however is relating these geometrical figures with real-life
experience and stereo perception.  There are people (and I believe Paul
Talbot is one of them - per earlier P3d postings) who do not perceive the
stereo window set at 7 ft. (or whatever) from the camera.  There are people
who don't "see" or understand the concept, no matter what the "theory"
predicts.  There are people who don't see "stretch" or related space
deformations as described by these geometrical models.

So, the best thing to do, IMO, is to first experiment by shifting/cropping
the images to see what happens.  And, if you are capable or inclined, then
work out the formulas/geometry to gain a better understanding/insight of
the situation.

-- George Themelis


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