Abstract: Lately new types of man-machine interfaces for lightening burdens of users have been studied vigorously. One important example of these interfaces is a system for users to put instruction in the noncontact way. In such systems, users put instruction into virtual environment by gestures through stereo cameras. However, the systems proposed before have several restrictions of the environment where these systems are used. Here, we note two of them, the arrangement of stereo cameras and the background of the user. They are very important in the system applications. Thus we propose a new system to put instruction into virtual environment in the noncontact way through stereo cameras, reducing these two restrictions. First, we describe the outline of the proposed system and then we describe a new algorithm to estimate the 3D motion of user's hand and the position of the head by our system. Experiments to estimate user's hand motion are made and the results are shown.!3
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