How to see around corners

Exploiting scatter
Most ultra-fast imaging technologies aim to mitigate the effects of scattered light, focusing instead on just the first photons to reach the sensor. The difference here, says Raskar, "is that we actually exploit the scattered light".

The camera really earns its ultra-fast label. It can record images every 2 picoseconds, the time it takes light to travel just 0.6 mm. So it can record the distance travelled by each photon with sub-millimetre precision.



Uploaded by NatureVideoChannel on Mar 14, 2012
This video shows how scientists at the MIT Media Lab (www.media.mit.edu/) reconstruct a hidden object using scattered laser light. Future applications may include seeing in dangerous or inaccessible locations, such as inside machinery with moving parts, or in highly contaminated areas.

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