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There are many applications for which part location measurements are needed to control or verify a process in manufacturing. Simple applications such as pick and place often use a machine vision system to locate a part on a plane. Bin picking using robots has employed simple 3D measurements such as those from stereo imaging or laser radar to determine both the distance and the orientation of parts. These applications require more than just presence or absence as might be provided by a proximity gage; they require sufficient location information to guide a robot to a part with sufficient dimensional resolution for the robot to be able to grip the part and not just run into it.
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