The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 1979
Filed:
Apr. 25, 1977
Kurt Ehrat, Steinmaur, CH;
Gretag Aktiengesellschaft, Regensdorf, CH;
Abstract
A method is provided for automatically assessing a printed article, in particular a bank-note. The sample to be assessed is compared point by point with an original and differential values are thereby formed between the reflectance values obtained by photoelectrical scanning from the individual image points of the sample and the reflectance values of the image points of the original corresponding to the sample image points. The differential values of each image point are added, in the correct sign, with predetermined weighting, to the differential values of the image points adjacent thereto, and the sample is assessed as faulty if the absolute amount of the added differential values exceeds a predetermined threshold value at least in one image point.