Want X­ray vision like the man of steel? A technology that lets you see behind walls could soon be built in to your cell phone.
MIT professor Dina Katabi and graduate student Fadel Adib have announced Wi­Vi, a demonstration of a technology that uses Wi­Fi to allow a viewer to "see" a person moving behind a wall. (Wi­Vi stands for "Wi­Fi" and "vision."
Previous work demonstrated that the subtle reflections of wireless inter signals bouncing off a human could be used to track that person's movements, but those previous experiments either required that a wireless routerwas already in the room of the person being tracked, or "a whole truck just to carry the radio," said Katabi.
The new device uses the same wireless antenna as is found in a cell phone or laptop and could in theory one day be embedded in a phone.
The trick is canceling out all interfering signals – Wi-Fi doesn't just bounce off humans, but also walls, floors, and furniture. And those signals are 10,000 to 100,000 times more powerful than the reflections off a human body.
Katabi's wi­vi sends out two wireless signals, one of which is the inverse of the other. In what Katabi calls "interference nulling," the two signals cancel each other out unless they hit a moving target – such as a human.
"To silence the noise, we change the structure of the Wi-Fi signal so all the undesired reflections cancel," she said.
The device is meant to be portable so, for example, a person worried that someone was hiding in the bushes could do a quick scan for her personal safety.
Wi­Vi could also serve as a high tech baby monitor or help Superman – or just cops – catch baddies.
www.livescience.com

good moves. hope it won't be used to see via someone "privacy"

pendusky: good moves. hope it won't be used to see via someone "privacy"

when it gets to Nigeria? Yes!
I'll just advice the gurls to invent anti Wi-vi and install in their bathrooms.

Just like Google glasses, it can scan through human body. Currently it is used by security to search for weaponry

In Nigeria its going to be used for other purposes such as invading other's privacy.

psucc: In Nigeria its going to be used for other purposes such as invading other's privacy.

so do we pray it doesn't get to Nigeria?

Beautiful!