Geometrical instruments – Straight-line light ray type – Multisight line
Reexamination Certificate
2007-06-12
2007-06-12
Fulton, Christopher W. (Department: 2859)
Geometrical instruments
Straight-line light ray type
Multisight line
C356S138000, C356S622000
Reexamination Certificate
active
11312826
ABSTRACT:
One embodiment of the present invention provides a system that uses a visual tag to determine an angle. During operation, the system observes the visual tag from an observation point, wherein the visual tag includes an angle-sensitive image which changes in appearance when observed from different angles. Next, the system uses the appearance of the angle-sensitive image (as observed from the observation point) to determine the angle between the visual tag and the observation point. In a variation on this embodiment, the system uses the determined angle along with supplemental information to determine the physical location of the observation point.
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Fulton Christopher W.
Palo Alto Research Center Inc.
Park Vaughan & Fleming LLP
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