Method for integrating hidden information in a set of notes
OwnerStephen Wolthusen, Christoph Busch +1inventors
InventorsStephen Wolthusen, Christoph Busch, Ero Rademer
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Abstract
The present invention relates to a method for integrating hidden information in a set of notes. In this method, the geometric shape of the geometric elements of the set of notes and/or their geometric relationship to each other are modified compared to the original version according to a predetermined key in such a manner that the modifications bear the to-be-integrated information in digital form and legibility of the set of notes is not impaired. In particular, the method permits integrating a marking in a set of notes that is not lost by copying or simple manipulation of the set of notes.
Claims23
A method for integrating hidden information in a set of notes composed of a multiplicity of geometric elements in which the geometric shape of some of said geometric elements of said set of notes and/or their mutual geometric relationship compared to the original representation are modified according to a predetermined key in such a manner that said modifications bear the to-be-integrated information in digital representation and do not impair the legibility of said set of notes.
A device for carrying out the method according to one of the preceding claims having
- a means to read in or to integrate a set of notes,
- a unit for said geometric analysis of said set of notes for suited geometric elements for integrating said information and for integrating said predetermined information in said set of notes by modifying according to a predetermined key the geometric shape of some of said suited geometric elements and/or their mutual geometric relationship compared to the read in or entered representation, and
- a means for the output of said set of notes provided with said information.
A method for reading out said information integrated in said set of notes using said preceding method, in which said geometric elements of said set of notes are detected and said information is determined by comparing said geometric elements with the original set of notes or by comparing the single elements with each other according to said predetermined key based on deviations in said geometric shape and/or in said mutual geometric relationship.
Dependencies are inferred from the claim text.