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Here's a cheap way to make a rangefinder with a laser and a webcam.
You adjust the laser to be parallel with the camera, but a few inches away. Then, you can measure how far the visible dot is from the camera's center to calculate the distance. Further from center = closer to object.
It's sort of like binocular distance estimation with a single camera!
Submitted by jason - 2007-05-07 13:31:27
Channels - makezine 
futuretech
Tags - laser hack robotics webcam rangefinder binocular
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Fascinating ... though I sure as hell don't know anyone who'd have the technical skill to use this information...
Submitted by nbr - 2007-05-13 21:14:26