Position determination
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United States of America Patent
Stats
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Apr 15, 1986
Grant Date -
N/A
app pub date -
Dec 20, 1984
filing date -
Jan 16, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for determining the relative positions of a first object (1) and a second object (3). The method comprises illuminating the first object (1) so as to produce a shadow (17) of the first object on a surface (15) lying at a known position with respect to the second object (3) and forming a two dimensional image of a scene including the surface (15). The distance between the position of the shadow (17) and a reference position (19) in the two dimensional image is monitored, and this distance is used to derive information relating to the relative positions of the first object (1) and the second object (3).
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