[photo-3d] Re: wobble stereo/motion parallax

[Jim Crowell <crowell@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Joshua N. Rubin wrote:
> Jim Crowell:
>> For anyone who's playing with this, try viewing the images through a pinhole
>> (as small as you can see the image clearly through).
>
> Haven't tried this but I'm curious about the concept.  Did you drop a ;^)?
> 
> Josh (whizzing by at 80, blue-green on the left eye, X-Ray Spex on the
> right)
> 


No, actually it's a serious suggestion (I know, what're the odds?  :-)  ).

To get the best effect, you want to minimize the conflicting cues that are
telling you the screen is flat.  Covering one eye will definitely help.
Also, when looking through a pinhole, your eye doesn't have to focus on the
screen; as in a pinhole camera, it increases your depth of field, so your
ocular lens can relax (i.e. focus father away) & still keep the screen in
focus.  Another way to achieve this would be to wear about a +2 pair of
reading glasses.  This is assuming you still have your accommodation, i.e.
it wouldn't apply to most people older than 45 or so.  Also, with a pinhole
you'll probably hide the rest of the stuff around the image (the monitor
frame, etc.) that's telling you it's a flat screen.

For anyone who's been on the list a while, the latter are two of the
principles behind Ken Dunckley's (sp?) 3-DVG thingy.

-Jim C.


-------------------------------------
Jim Crowell, Ph.D.
Dept. of Psychology
Cognitive/Experimental Group
216 Lazenby Hall
Ohio State University
Columbus, OH 43210
mailto:crowell@xxxxxxxxxxxxxxxxx
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http://vision-lab.psy.ohio-state.edu/crowell/