It uses variations in radio signals to recognise human silhouettes and track movement
X-ray vision, a comic book fantasy for decades, is becoming a reality in a lab at the Massachusetts Institute of Technology (MIT).
A group of researchers, led by Professor Dina Katabi, has developed software that uses variations in radio signals to recognise human silhouettes through walls and track their movements.
Researchers say the technology will be able to help health-care providers and families keep closer tabs on toddlers and the elderly, and it could be a new strategic tool for law enforcement and the military.
“Think of it just like cameras, except that it’s not a camera,” said Fadel Adib, a researcher on the MIT team developing the device. “It’s a sensor that can monitor people and allow you to control devices just by pointing at them.” Work began in 2012 to determine how wireless signals could be used to “see” what’s happening in another room, said Professor Katabi, who directs the MIT Wireless Centre.
“At first, we were just interested ... can you at all use wireless signals to detect what’s happening in occluded spaces, behind a wall, couch, something like that,” Professor Katabi said. “It turned out that we were able to detect that. And when we figured out we could detect that, we started asking more advanced questions — Could we use it to detect exactly how people are moving in a space if they are behind a wall?”
The device displays the signal on a screen, where the person’s movements can be tracked in real time. It depicts the target as a red dot moving around the room, occupying a chair and speeding up or slowing down. A company set up to market the technology, now dubbed Emerald, will spin out of the MIT lab next year, with a goal of marketing the device early in 2017 at $250-300, Mr. Adib said. — AP
