Tuesday, 11 June 2013

Gesture recognition technology using wi-fi signals.



This technology, which they call 'WiSee', is to appear at The 19th Annual International Conference on Mobile Computing and Networking.  A team, led by a Indian researcher, has developed a system which uses radio waves from Wi-Fi to sense human body movements and detect command gestures from anywhere within a home or office.  University of Washington computer scientists have shown it’s possible to leverage Wi-Fi signals around us to detect specific movements without needing sensors on the human body or cameras.  By using an adapted Wi-Fi router and a few wireless devices in the living room, users could control their electronics and household appliances from any room in the home with a simple gesture.  “This is repurposing wireless signals that already exist in new ways,” lead researcher Shyam Gollakota, a UW assistant professor of computer science and engineering, said.  “You can actually use wireless for gesture recognition without needing to deploy more sensors,” he said.  This technology, which they call “WiSee,” is to appear at The 19th Annual International Conference on Mobile Computing and Networking.  The concept is similar to Xbox Kinect – a commercial product that uses cameras to recognize gestures – but the UW technology is simpler, cheaper and doesn’t require users to be in the same room as the device they want to control.  That’s because Wi-Fi signals can travel through walls and aren’t bound by line-of-sight or sound restrictions.  The UW researchers built a “smart” receiver device that essentially listens to all of the wireless transmissions coming from devices throughout a home, including smartphones, laptops and tablets.  A standard Wi-Fi router could be adapted to function as a receiver.  When a person moves, there is a slight change in the frequency of the wireless signal.  Moving a hand or foot causes the receiver to detect a pattern of changes known as the Doppler frequency shift.  These frequency changes are very small – only several hertz – when compared with Wi-Fi signals that have a 20 megahertz bandwidth and operate at 5 gigahertz.  Researchers developed an algorithm to detect these slight shifts. The technology also accounts for gaps in wireless signals when devices aren’t transmitting.  The technology can identify nine different whole-body gestures, ranging from pushing, pulling and punching to full-body bowling.  The researchers tested these gestures with five users in a two-bedroom apartment and an office environment.  Out of the 900 gestures performed, WiSee accurately classified 94 percent of them.

Source: DnaIndia.