Image subtraction to remove ambient illumination

Details Image subtraction to remove ambient illumination Image subtraction to remove ambient illumination

1997-12-01

2000-02-01

Boudreau, Leo H.

Image analysis

Applications

Personnel identification

348370, 348701, G06K 900, H04N 5222, H04N 514

Patent

active

060212101

ABSTRACT:
In a method of image subtraction a series of frames of a subject are taken using a video camera The subject is illuminated in a manner so that illumination is alternately on then off for successive fields within the image frame. A single frame is grabbed and an absolute difference between the odd field and the even field within that single image frame is determined. The resulting absolute difference image will represent the subject as illuminated by the system illumination only, and not by any ambient illumination, and can then be used to identify the subject in the image.

REFERENCES:
patent: 4490037 (1984-12-01), Anagnostopoulos et al.
patent: 4636850 (1987-01-01), Stewart
patent: 4641349 (1987-02-01), Flom et al.
patent: 5291560 (1994-03-01), Daugman
patent: 5497430 (1996-03-01), Sadovnik et al.
patent: 5574511 (1996-11-01), Yang et al.

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