HEAD TRACKING SYSTEM
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United States of America Patent
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Issued Date -
Jul 25, 2013
app pub date -
Jan 23, 2013
filing date -
Jan 25, 2012
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Abstract
The invention relates to a head tracking system that determines an absolute head position of a user's head. The head tracking system comprises a first positioning system and a second positioning system. The first positioning system comprises a reference unit that is fixedly installed remote from the head and defining a first coordinate system. The first positioning system further comprises a positioning unit attached to the head and configured to communicate with the reference unit to establish position data including indicators indicating a head position in the first coordinate system when the positioning unit is within a field of view of the reference unit. The second positioning system comprises a digital compass attached to the head and configured to establish second position data including indicators indicating a head position in a second coordinate system. The head tracking system further comprises a head position determining module configured to determine the absolute head position based on at least one of the first position data and the second position data.
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