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ansgri
on April 20, 2012
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If You Have A Smartphone, Anyone Can Now Track You...
AFAIK, current machine vision technology can provide at most ~85% tracking accuracy in crowded environments.
fennecfoxen
on April 20, 2012
[–]
This technique may be relevant to your interests.
http://www.google.com/patents?id=hXYEAgAAEBAJ
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