Nov.29, 2013
MIT researchers have figured out how to obtained ultrasharp images of weakly illuminated objects using single photons.
Electrical engineer Ahmed Kirmani of the Massachusetts Institute of Technology in Cambridge and his colleagues developed an algorithm that can be used with a standard, off-the-shelf photon detector. "We didn't invent a new laser or a new detector," notes Kirmani.
In their setup, they user a standard photon detector that fired low-intensity pulses at a given location. And the algorithms pick out variations in the time it takes for photons from the laser pulses to be reflected back from the object which provides depth information about the body. After that researchers used various software to eliminate the noise, which enabled them to produce high-resolution, 3D images using a total of about one million photons. By comparison, it would have required several hundred trillion photons with a mobile-phone camera to produce an image of similar quality.
This achievement could be used to for military surveillance, such as in a spy camera that records a scene with a minimum of illumination to elude detection.
via nature
Posted in 3D Scanning
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