Object detector

Details Object detector Object detector

1994-10-26

1996-08-06

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

359465, 359501, G01J 400

Patent

active

055439179

ABSTRACT:
A method for detecting objects while eliminating unwanted background utilizes polarizing contrasts. A lens systems focuses light from the field of view through a beam splitter. One beam passes to a digitizer through a polarizer which polarizes the beam at one angle. The other beam is reflected to another polarizer, which is located at a 90.degree. angle relative to the first polarizer. The pixels from the polarized images are digitized. A processor compares the corresponding pixels, subtracting one from the other to find a polarizing contrast. A range that can be varied will display only those pixels which have polarizing contrasts within the selected range. The selection of the range will either include or eliminate the background while displaying man-made targets.

REFERENCES:
patent: 3904293 (1975-09-01), Gee
patent: 3992571 (1976-11-01), Garlick et al.
patent: 5138162 (1992-08-01), Hacskaylo
patent: 5264916 (1993-11-01), Bushman
patent: 5345308 (1994-09-01), Bushman
patent: 5404225 (1995-04-01), Bushman
patent: 5452089 (1995-09-01), Bushman

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