Method and Apparatus for Checking a Value Document
AssigneeGiesecke & Devrient GmbH
InventorsJan Domke, Ingo Scholz
Life of this patent
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Abstract
There is described a method for checking a value document of a specified type for the suspected presence of a forgery, in particular of a pieced-together forgery, wherein at least one ultrasonic property of the value document is captured in a spatially resolved manner so as to form location-dependent measuring data, wherein while employing the location-dependent measuring data it is checked whether there are present in a specified checking region of the value document two areal regions whose ultrasonic properties deviate from each other according to a specified difference criterion, and wherein there is formed an authenticity signal which represents the result of the check. Further, a corresponding checking device is described.
Claims21
1-20. (canceled)
A method for checking a value document of a specified type for the suspected presence of a forgery;
- wherein at least one ultrasonic property of the value document is captured in a spatially resolved manner so as to form location-dependent measuring data,
- wherein while employing the location-dependent measuring data it is checked whether two areal regions are present in a specified checking region of the value document, so that the at least one ultrasonic property has a specified first course at locations in a first one of the two areal regions, and the at least one ultrasonic property in the first areal region and the at least one ultrasonic property in the other areal region deviate from each other according to a specified difference criterion, and
- wherein there is formed an authenticity signal which represents the result of the check.
A system of value documents which comprises at least two different value-document types which respectively have a carrier material specific to the respective value-document type having a weight per unit area specific to the respective value-document type, with the weights per unit area differing for at least different value-document types.
Dependencies are inferred from the claim text.