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:
Jan. 09, 2018
Filed:
Sep. 25, 2014
Giesecke & Devrient Gmbh, München, DE;
Shanchuan Su, Neubiberg, DE;
GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH, Munich, DE;
Abstract
Described is a method for checking a value document having a polymer substrate and at least one see-through window, in which a digital transmission image of the value document is captured, the transmission image comprising pixels, in the image an edge brightness value for the brightness of an edge of the at least one see-through window is ascertained, using the edge brightness value, a threshold value for the recognition of a print removal is ascertained which is smaller than the edge brightness value but greater than the minimal brightness in the image, it is checked whether pixels which lie in at least one specified portion of the image and outside the at least one see-through window and its edge have a brightness which lies above the threshold value.