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A New Input Device for 3D Sketching

We present a 3D input device consisting of a stiff piece of paper which is tracked by a digital video camera. The user can also draw on the paper using a pen-like device. The user moves the paper to specify the location of a virtual plane. By drawing on the paper, the user can specify points in 3D space. The primary technical contribution of this paper is a new pose estimation algorithm suitable for a hand-held, moving pattern. To demonstrate the usefulness of the device we developed a sketching application for simple characters. The characters are constructed by sketching and joining together 3D ellipses, much as traditional cartoon characters are created in 2D using 2D ellipses.