05828770 is referenced by 425 patents and cites 7 patents.

A system for determining the spatial position and angular orientation of an object in real-time is provided having a sensor section and a plurality of activatable markers, adapted for mounting to the object. The plurality of markers are activated simultaneously during each cycle of the sensor section after an initial marker-identification mode and energy emitted by such simultaneously activated markers is detected by the remotely located sensor. With such system, because the markers have been each uniquely identified during the marker-identification mode, and the relative marker geometry is known a prior, the markers can be simultaneously activated, detected and tracked during a subsequent marker-tracking mode. With such an arrangement, less expensive sensors with relatively low sensor cycle rates may be used.

Title
System for determining the spatial position and angular orientation of an object
Application Number
8/603791
Publication Number
5828770
Application Date
February 20, 1996
Publication Date
October 27, 1998
Inventor
David Ristau
Kitchener
CA
Stephen Eldon Leis
Waterloo
CA
Agent
Fish & Richardson P C
Assignee
Northern Digital
CA
IPC
G06K 9/00
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