This paper describes SmartCanvas, an intelligent desk system that allows a user to perform freehand drawing on a desk or similar surface with gestures. Our system requires one camera and no touch sensors. The key underlying technique is a vision-based method that distinguishes drawing gestures and transitional gestures in real time, avoiding the need for "artificial" gestures to mark the beginning and end of a drawing stroke. The method achieves an average classification accuracy of 92.17%.

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... shaped menus and a "rotateto-and-select" approach eliminate the need for a fixed menu display, resulting in an "invisible" interface.