Re: stereovision question

[P3D Josh Rubin <jnr@xxxxxxxxx>]

Jim Crowell writes:     

>   is called motion parallax.  At an abstract, mathematical level
>   it is identical to stereo (you can describe motion parallax as
>   stereo with two eyes displaced in time as well as space, or
>   stereo as one eye moving back & forth at infinite speed), but in
>   the brain they're supported by rather different mechanisms.  Up
>   to a point, anyway; there's probably some level at which the two
>   converge.
   
I recall from my undergrad days that there are
feature detectors, including motion detectors,
at the retina, or at least in the optic nerve,
at least in frogs.  But I betcha that the depth cues
from motion parallax, even though monocular,
occur "after" the convergence of the two
optic nerves.  That being the case (if it is),
why wouldn't it be adaptive for the binocular
mechanisms to be available to parse and
interpret monocular stimuli?

Josh
   


------------------------------

End of PHOTO-3D Digest 1271
***************************