METHOD AND DEVICE FOR THE INSERTION OF GUILLOCHE PATTERNS

The invention concerns a method for extracting guilloche patterns (601-608) from a secure document (600) likely to be degraded, the method comprising the following operations:- determining (710) a contrast card (c) of at least one portion of the secure document that includes the guilloche patterns;-...

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Bibliographic Details
Main Authors JOURLIN, MICHEL, LEIBENGUTH, JOSEPH, BOUABDELLAH, MOHAMED, CARRÉ, MAXIME
Format Patent
LanguageEnglish
Polish
Published 06.02.2023
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BOOKBINDING
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Summary:The invention concerns a method for extracting guilloche patterns (601-608) from a secure document (600) likely to be degraded, the method comprising the following operations:- determining (710) a contrast card (c) of at least one portion of the secure document that includes the guilloche patterns;- identifying (720), on this contrast card an optimal percolation trajectory; and- extracting (730) the optimal percolation trajectory, said trajectory corresponding to the guilloche pattern.The invention also concerns a method of authentication of the guilloche patterns of a secure document likely to be degraded, involving:- the preceding extraction operations, and- an operation (740) of comparing each extracted guilloche pattern with a corresponding theoretical guilloche pattern.
Bibliography:Application Number: PL20180774049T