T3D Re: Cardboarding...

[john bercovitz <bercov@xxxxxxxxxxx>]

Bill Carter wrote:
> I believe "cardboarding" is a dual lens artifact; [...]
> One way of testing this thesis might be to suspend dull, un-textured spheres
> (such as last years "Father Christmas"'s balls) in an evenly illuminated set
> (having a back ground that contrasts the spheres), and examining the results?
> Do you know of any arguments to support this concept?

I disagree with your thesis but I commend your suggested experiment.

P.J.Homer wrote:
> Would a matte featureless sphere give any stereo effect even though each eye 
> would be viewing a different hemisphere?

I think whether dual or single lens stereo, a featureless sphere with perfectly
uniform lighting will shown no depth.

The experiment as I envision it would be pretty simple.  Shoot the featureless
sphere with the single lens stereo camera and then shoot is again with an SLR
on a slide bar to mimic the dual lens camera.  For the separation, use the separation of the centroids in the single lens camera.  For aperture, use the 
half the aperture of the single since in the single, half the aperture goes to 
each image.  And of course match focal lengths.

John B


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