Optics: measuring and testing – By shade or color
Patent
1992-10-30
1993-08-17
Noland, Tom
Optics: measuring and testing
By shade or color
101181, 101 76, 283 70, G01N 2127
Patent
active
052373940
ABSTRACT:
A print verification method and apparatus verifies the integrity of information printed on a document. The information to be verified is printed on a document in a first color. Desired information is printed on the document in a second color which is different from the first color. The desired information is printed directly above the information printed in the first color. It is detected whether any of the information printed in the first color is exposed following printing of the desired information in the second color. If any of the information printed in the first color is detected to be exposed, an indication is made that improper printing has occurred. If, however, no information printed in the first color is exposed following printing of the desired information in the second color, it is verified that proper printing has occurred.
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Noland Tom
Xerox Corporation
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