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

1980-11-07

1983-05-24

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328160, 328161, 358160, 358282, H04N 519, H04N 718

Patent

active

043853188

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. One of the two video signals is multiplied by a first predetermined value to generate a first product signal. The first product signal and the other one of the two video signals are combined to generate a second product signal having a magnitude representing the ratio between the other one of the two video signals and the first product signal with the first product signal as the denominator. A signal having a second predetermined value is then subtracted from the second product signal to generate the comparison signal. 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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