Method and apparatus for comparing data signals in a container i

Details Method and apparatus for comparing data signals in a container i Method and apparatus for comparing data signals in a container i

1980-12-22

1984-03-13

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 718

Patent

active

044371160

ABSTRACT:
The present invention relates to an apparatus and method for generating a comparison signal representing the magnitude difference between two successive video signals representing adjacent inspection points on the container. The comparison signal is generated with a magnitude representing the ratio between the two video signals. The ratio is calculated with the one of the two video signals having the larger magnitude as the denominator. A comparison signal generated in this manner is insensitive to general light variations across the container.

REFERENCES:
patent: 3379826 (1968-04-01), Gray
patent: 4054377 (1977-10-01), Gibson
patent: 4246606 (1981-01-01), Yoshida

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