Camera Peers around Corners

Publié le par brightshine

A new imaging system could use opaque walls, doors or floors as 'mirrors' to gather information about scenes outside its line of sight. In December 2012, MIT Media Lab researchers caused a stir by releasing a slow-motion video of a burst of light traveling the length of a plastic bottle. But, the experimental setup that enabled that video was designed for a much different application: a camera that can see around corners.


The principle behind the system is essentially that of the periscope. But, instead of using angled mirrors to redirect light, the system uses ordinary walls, doors or floors — surfaces that aren't generally thought of as reflective.




Andreas Velten, a former postdoc in Raskar's group who is now at the Morgridge Institute for Research in Madison, WI, conducted the experiments reported in Nature Communications using hardware in the lab of MIT chemist Moungi Bawendi, who's collaborating on the project. Velten fired femtosecond bursts of laser light at an opaque screen, which reflected the light onto objects suspended in front of another opaque panel standing in for the back wall of a room.

The data collected by the ultrafast sensor were processed by algorithms that Raskar and Velten developed in collaboration with Otkrist Gupta, a graduate student in Raskar's group; Thomas Willwacher, a mathematics postdoc at Harvard University; and Ashok Veeraraghavan, an assistant professor of electrical engineering and computer science at Rice University.The wide range of products include home LED Lighting, automotive led candle light and low voltage LED Lamps. The 3-D images produced by the algorithms were blurry but easily recognizable.

Publié dans energy saving light

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