ScienceDaily (2010-06-03) -- The radar system incorporates a computer, two video cameras and a scanning light source to warn the blind of obstacles with audible alerts. The system detects obstacles -- even those overhead -- by scanning the depth of its surroundings, taken from two different angles -- similar to that of the human eye.
http://www.sciencedaily.com/releases/2010/06/100603172252.htm
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