ALL you need to control a cellphone via hand gestures is the phone's signal. The radio waves emitted by cellphones are reflected back to them in unique ways by hands – allowing gestures to be recognized.
Side Swipe is the work of Matthew Reynolds and colleagues at the University of Washington in Seattle. It comprises an algorithm that recognizes the unique reflections created when fingers interrupt a burst of the radio waves that send information between your phone and the cellphone mast. In tests with 10 volunteers, the program could recognize eight separate taps, four hovers and two sliding gestures with 87 per cent accuracy.
The idea is to let people control their phones without having to touch them. "It enables interaction with the phone where touchscreens and camera-based sensors cannot work because they are occluded," says Reynolds. So if the phone in your pocket rings loudly in a meeting, a wave of your fingers silences it, sending the call to voice-mail. Or sliding hand motions can skip, change the volume or mute music tracks. Side Swipe will be presented at a user interface conference in Hawaii in October.
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