In-air Typing Interface for Mobile Devices
We propose vision-based interface for mobile devices by tracking 3D motion of a human fingertip using a single camera and by recognizing small input gestures in the air. Since the fingertip near the camera moves fast in the image, a high-frame-rate camera is used for stable tracking. In order to separate the click gesture from the others, frequency filter is applied to scale change in the fingertip images.
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