P3D polarization

[bob Wier <wier@xxxxxxxxxxxxxxxxx>]

Hi Tom (and everybody else). Thanks for the informative (and
lengthy!) posting on the polarization topic.

In case anyone is interested, the reason I'm looking at this
is that I have a Board meeting coming up shortly which will
be discussing funding some photographic images made this way.
I'm attempting to get a handle on the technology to ascertain
how well it might work, etc, since I personally have not seen
any results yet. 

Here are a couple of URLs:


http://www.rutnut.com/nwocta/preservation/signature/signature.html


This was an original proposal along these lines, and mentions
linear polarization.

A much more recent update is:

http://www.rutnut.com/nwocta/newsletters/99jul/kelton.html

Which mentions "cross polarization" techniques, which I 
could interpret either as linear *or* circular polarizers.

The thought here is that the crystal grains of the rock
matrix should reflect or depolarize light differently than
an organic compound or minerals with an organic binder. Since
all of these have been exposed to the weather for 125+ years,
pulling information out of the photos may well be rather
difficult!

In fact, I can possibly see a 3D application for this. If you
took *stereo* pictures, not only would you preserve the shape
of the original objects,  but if you used different polarization
over each lens on the *taking* camera, you might produce retinal
rivalry or pseudo stereoscopic effects which would further enhance
picking up the faint images.

-THANKS!

--Bob Wier

       mailto:wier@xxxxxxxxxxxxxxxxx 
       1:32 PM Friday, July 30, 1999
     Unix/Internet Systems Administrator
    Rocky Mountain College, Billings, MT
      (currently in Ouray, Colorado)



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