Researchers see through walls with 'Wi-Vi'

MIT professor Dina Katabi and graduate student Fadel Adib have announced Wi-Vi, a demonstration of a technology that uses Wi­Fi to allow a viewer to "see" a person moving behind a wall.

The system, called "Wi-Vi" (Wi-Vi stands for "Wi­Fi" and "vision"), is based on a concept similar to radar and sonar imaging. But in contrast to radar and sonar, it transmits a low-power Wi-Fi signal and uses its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a wall.

"We wanted to create a device that is low-power, portable and simple enough for anyone to use, to give people the ability to see through walls and closed doors," Katabi says.

"The technology can also determine the motion of different persons in a closed room," the team explains on the project's page. "It can answer questions such as: Is the person moving towards the device or away from it? What is the angle of motion of a person inside a closed room relative to the location of WiVi?"

Wi-Vi, being presented at the Sigcomm conference in Hong Kong in August, could be used to help search-and-rescue teams to find survivors trapped in rubble after an earthquake, say, or to allow police officers to identify the number and movement of criminals within a building to avoid walking into an ambush.

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