Scientists find way to photograph people through walls using WiFi

Scientist at the Technical University of Munich have come up with a new technology that can take 3D photographs of objects inside a room or building using WiFi.

The research, which was published by Physical Review Letters, shows that wireless data transmission systems including WiFi or Bluetooth emit electromagnetic waves with a precisely known amplitude and phase which can be used to map objects in their surroundings.

“Propagating in space, this radiation forms a hologram — a two-dimensional wave front encoding a three-dimensional view of all objects traversed by the light beam. Three-dimensional views of objects and emitters are made by feeding the resulting data into digital reconstruction algorithms,” Philip Holls and Friedemann Reinhard noted in their report.

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