来源：未知 作者：纵旁 时间：2017-04-18 02:00:16
Toshiba is making computers that respond to hand gestures. Eight light-emitting diodes on the PC flash infrared light at 50 hertz while a lens and motion detector pick up reflections from the user’s hand. The motion detector is programmed to ignore low-level reflections from the background but respond to movements close to the screen. The computers are now being taught to recognise sign language.