Re: Cardboard cutouts and backdrops...

[P3D Bob Wier <wier@xxxxxxxxxxxxxxxxxxxxxxxx>]

|
|Along with learning to decouple depth cues, it's important to learn to
|recouple them when not viewing stereo photographs. :-)
|
|John R

I recall reading that in the military, there were some photo-interp
guys working with stereo aerial photos  8 hours per day on a continuous
basis (to make topo maps, for example,you can take overlapping photos straight
down from a plane, then use them in a stereo plotter to draw the
contours). I can't recall - it may have been as far back at WWII or
Korea.

Since the plotters were set up for minimum eye strain, the guys
basically just had no convergence and focusing muscles in use since these
parameters were optically generated.

It turned out they developed problems after awhile in coupling for
stereo vision and focusing in "normal" vision since they were doing
so little of it. I guess it was an early version of the problems of
extended weightlessness in orbit that astronauts experience when they
return to earth!

--BW

          ====== wier@xxxxxxxxx ======
  8:13 AM Friday, August 29, 1997
   keeper of the Photo-3d, Overland-Trails, LDS State
    Research Outline Guides and other stuff
     (currently in Ouray, Colorado)



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