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Thursday, July 19, 2012

Light trick to see around corners

15 July 2012 

Light trick to see around corners

By Jason Palmer
Science and technology reporter, BBC News

The letter A with no scattering (top), behind scattering
plastic (centre) and re-imaged with the new technique

Scientists have found a novel way to get images through "scattering" materials such as frosted glass or skin, and even to "see around corners".

Much research in recent years has focused on correcting for scattering, mostly for medical applications.

But the new trick, reported in Nature Photonics, is quick, simple and uses natural light rather than lasers.

It uses what is called a spatial light modulator to "undo" the scattering that makes objects opaque or non-reflecting.

A camera that can "see around corners" garnered much attention in 2010, using a series of timed laser pulses to illuminate a scene and working out what is around a corner from the timing of the reflections. (...)

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