Object discriminator

Details Object discriminator Object discriminator

1992-09-17

1994-09-06

Hellner, Mark

Optics: measuring and testing

By polarized light examination

359371, 359407, 359501, 250330, 250342, G01J 400

Patent

active

053453085

ABSTRACT:
A device will detect man-made objects by using a polarizer mounted to a video camera. The polarizer rotates about an axis in front of a lens array of the video camera. The rotation of the polarizer alternately polarizes light received in proportion to the speed of rotation. This produces flashing in intensity for detecting the object as well as background rejection due to its lack of polarization. A man-made object having both horizontal and vertical surfaces of a type that will reflect light that can be polarized will provide flashing through the lens array as the polarizer passes through horizontal and vertical position. On the other hand, backgrounds don't have polarized components and won't flash. Attention is drawn to the man-made target. A high pass filter between the video signal processor and the monitor reduces background from the observed scene, permitting precise lock-on to the target.

REFERENCES:
patent: 3549259 (1967-12-01), Klatchko
patent: 4202601 (1980-05-01), Burbo et al.
patent: 4601552 (1986-07-01), Jessmore
patent: 5138162 (1992-08-01), Hacskaylo
patent: 5264916 (1993-11-01), Bushman

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