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A head position detector system includes a cue definition apparatus arranged to be securely mounted on a head whose position is to be monitored, a single camera electro-optical detector arranged to view the cue definition apparatus, a cue processing apparatus receiving an output of the detector and

A head position detector system includes a cue definition apparatus arranged to be securely mounted on a head whose position is to be monitored, a single camera electro-optical detector arranged to view the cue definition apparatus, a cue processing apparatus receiving an output of the detector and a memory apparatus for storing updated cue addresses for providing an output indication of head position to utilization apparatus.

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A head position detector system comprising: cue definition means carrying cues thereon and arranged to be securely mounted on a head of a subject, a position of which is to be monitored; a single camera arranged to view said cues of the cue definition means; cue detection means receiving an output o

A head position detector system comprising: cue definition means carrying cues thereon and arranged to be securely mounted on a head of a subject, a position of which is to be monitored; a single camera arranged to view said cues of the cue definition means; cue detection means receiving an output of said camera; and memory means for storing updated cue addresses for providing an output indication of the head position to a utilization apparatus, said cue definition means comprising three cues located along imaginary circle and being angularly spaced from each other, said imaginary line having its center located at the center of the head to be monitored.