camouflage

[telscope@xxxxxxxxxx (Peter Abrahams)]

To some degree, stereo vision can defeat camouflage.  This is partly 
because the outline of an object seems to move against the background 
when comparing right and left, and partly because the shadows shift 
in a similar way.  There other visual cues that emerge in stereo 
viewing that are difficult to see in flat photos, can they be used to 
reveal patterns or hidden objects?
Stereo World, 1/2 1986, has a brief article on the subject.  The claim
is made that moths will press their wings close to the bark of a tree to
minimize their shadow. In 1986, little was known on animal depth
perception, has that field (be it ever so slightly off topic here) expanded?
Camouflage is also used in warfare, has stereoscopy been used to defeat
this subterfuge?  The SW article notes the German WWII airstrips that
had bomb craters painted on them, a ruse exposed by aerial stereo
photography.  
A search of the Photo 3d archives for 'camouflage' turned up only one 
relevant post, from 12/17/94, concerning the origin of the random dot
 stereogram, partly inspired by observing aerial stereographs of
 camouflaged tanks and noting their appearance in stereo.  This from 
the early 1950s, by Bela Julesz, a psychologist whose student, C. Tyler, 
developed the single picture stereogram.  

Are there stereo photographers who have made a study of animal 
or human camouflage, ViewMaster sets on the subject, or Keystone cards?


telscope@xxxxxxxxxx (Peter Abrahams)          
the history of the telescope, 
     the prism binocular, and the microscope


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