Object location apparatus

Details Object location apparatus Object location apparatus

1990-04-27

1991-05-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250560, 356376, G01N 2186

Patent

active

050139274

ABSTRACT:
A translucent support, which may be the support surface of an article conveyor, supports objects, locations or dimensions of which are to be determined. A point light source or light sources severally illuminate the surface and object thereupon. An imaging apparatus located below the translucent surface generates signals representing the images of the illuminated translucent surface and the shadows generated by the object thereon. The signals for two or more illumination conditions are processed to determine the locations of at least portions of the object. A particular avatar of the invention uses a conveyor with translucent web.

REFERENCES:
patent: 4063820 (1977-12-01), Borgese
patent: 4105925 (1978-08-01), Rossol et al.
patent: 4705081 (1987-11-01), Birk et al.
patent: 4803371 (1989-02-01), Durland
patent: 4926917 (1990-05-01), Kirbach
patent: 4929843 (1990-05-01), Chmielewski, Jr. et al.

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