Shape recognition of laser beam trace for human-robot interface
Pattern Recognition Letters
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We propose a new pointing device that can measure pointed positions by processing the interference concentric circles projected with a pointing device. The pointing device has a donut-shaped lens that is designed so as both to make the laser source be two hypothetical sources for forming optical interference and to project the concentric circle pattern widely. Two image sensors set on the projected side capture small parts of the concentric circles, and its center coordinate that is a pointed position of the pointing device is calculated from two normal lines to the arcs of the circles. In practice, we succeeded in measuring the pointed position accurately by real-time processing of the widely projected concentric circle patterns. We demonstrated mouse cursor operation on a large screen with the pointing device and also used it as real-object-based user interface to show the related information of real objects by pointing them.