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公开(公告)号：US10922913B2
公开(公告)日：2021-02-16
申请号：US16473825
申请日：2017-12-22
发明人： Johannes Feulner , Steffen Schmalz
摘要： A method is described for detecting a security thread in a value document, in which magnetic data are employed for sites on the value document, said magnetic data representing a magnetic property of the value document at the site, check sites on the value document are determined employing the sites, and from the check sites, a straight line is specified, along or on which at least some of the check sites lie and which represents a location of the security thread.
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公开(公告)号：US10573113B2
公开(公告)日：2020-02-25
申请号：US16092520
申请日：2017-04-10
发明人： Hendrik Derks , Jan Domke , Johannes Feulner , Norbert Holl , Steffen Schmalz , Dieter Stein , Stefan Kokrhoun
摘要： An apparatus and a corresponding method for checking value documents, involves at least one first sensor configured to detect electromagnetic radiation reflected and/or transmitted by a value document and to convert the radiation into corresponding first sensor signals. At least one second sensor is configured to detect sound waves reflected and/or transmitted by the value document and to convert the sound waves into corresponding second sensor signals, and an evaluation device configured to determine a first area value which characterizes a first area of the value document on the basis of the first sensor signals, to determine a second area value which characterizes a second area of the value document on the basis of the second sensor signals, and to infer a possible identification marking of the value document with a marking ink on the basis of the first and second area value.
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