Method and apparatus for locating an acquisition target in two-d

Details Method and apparatus for locating an acquisition target in two-d Method and apparatus for locating an acquisition target in two-d

1994-06-07

1996-05-07

Boudreau, Leo H.

Image analysis

Applications

382203, 382287, 235494, G06K 900

Patent

active

055154476

ABSTRACT:
A system and method are disclosed for locating an acquisition target consisting of a plurality of concentric rings of alternating levels of reflectivity (bull's-eye pattern) in two-dimensional images such as optically encoded symbologies. Such targets may be found even if they vary in size and tilt angle with respect to an imaging camera. Symmetry characteristics of the targets are used to locate the targets independent of the threshold level selected for determining transitions between rings of different reflectivity.

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