Imagine playing a video gamewhile moving freely throughout your house!
A
revolutionary new technology that uses radio signals to track a person
through walls and obstructions could change the way video games are
played, scientists say.
Researchers from the Massachusetts
Institute of Technology (MIT) have developed the new high-resolution, 3D
motion tracking system dubbed "WiTrack," which can pinpoint a person's
3D location to within 10 to 20 centimetres - about the width of an adult
hand.
"Imagine playing an interactive video game that
transforms your entire home into a virtual world. The game console
tracks you as you run down real hallways away from video game enemies,
or as you hide from other players behind couches and walls. This is
what WiTrack can bring to video gaming," said Dina Katabi, a professor
of computer science and engineering and co-director of the MIT Centre
for Wireless Networks and Mobile Computing.
Earlier this year,
Katabi and her graduate student Fadel Adib unveiled WiVi, a system that
detects humans through walls and can track the direction of their
movement using WiFi signals.
Based on this earlier work, Katabi
and Adib developed WiTrack in collaboration with Rob Miller, a professor
of computer science and engineering, and graduate student Zach
Kabelac.
In comparison to WiVi, WiTrack has significantly higher
accuracy and can track both two-dimensional and three-dimensional
movement using specialised radio waves, as opposed to WiFi signals.
WiTrack operates by tracking specialised radio signals reflected off a person's body to pinpoint location and movement.
The system uses multiple antennas: one for transmitting signals and three for receiving.
The
system then builds a geometric model of the user's location by
transmitting signals between the antennas and using the reflections off a
person's body to estimate the distance between the antennas and the
user.
WiTrack is able to locate motion with significantly
increased accuracy, as opposed to tracking devices that rely on wireless
signals, said Adib.
The system's ability to track motion
through obstructions could make it particularly useful not only in
gaming, but also in tracking elderly patients at high risk of falling.
Current
approaches to fall detection require individuals to continuously wear
sensors or install cameras in the person's home, researchers said.
While
WiTrack does not require individuals to wear sensors or install
cameras, it can still detect falls with very high accuracy.