Mailinglist Archives:
Infrared
Panorama
Photo-3D
Tech-3D
Sell-3D
MF3D
|
|
Notice |
This mailinglist archive is frozen since May 2001, i.e. it will stay online but will not be updated.
|
|
P3D depth perception cues
- From: Peter Abrahams <telscope@xxxxxxxxxx>
- Subject: P3D depth perception cues
- Date: Tue, 09 Mar 1999 20:27:19 -0800
>convergence is a "minor" cue for depth perception. ... implies that the
ability of humans to judge
>absolute depth by binocular stereo in the absense of other visual references
>is not very good.
Binocular stereo is based on the disparity between what the right & left
eyes see of the object, and convergence is sometimes a minor assist. What
am I missing here?
>I can think of a possible way to test it - when viewing a monochromatic
>"point" light source (of adjustable brightness) in otherwise total darkness,
>sufficiently far away that accommodation doesn't provide a good cue, and
with
>the test subject not allowed to move their head, then convergence should be
>just about the only cue, and the accuracy in judging distance can be
>evaluated.
If it's far enough that accomodation isn't a cue, then convergence will be
at its far limits as well (I speculate).
Convergence & accomodation together probably have greater sensitivity than
either one alone. Slight mismatches certainly set off alarms in the brain,
or cause objects to appear bigger or smaller than they are.
_______________________________________
Peter Abrahams telscope@xxxxxxxxxx
------------------------------
|