Method for recognition and tracking of fibrous media and applications of such a method, particularly in the computer field

Method for acceptance of a candidate fibrous medium made of paper, cardboard or non-woven as an authentic fibrous medium, comprising the following steps:

• generation of at least one authentic digital signature from a structural characteristic extracted from a reference zone of an authentic fibrous medium, said digital signature representing the fibrous structure of the reference zone, and recording said digital signature on a digital data medium;
• generation of a candidate digital signature from a structural characteristic extracted from a reference zone of a candidate fibrous medium, said digital signature representing the fibrous structure of said reference zone
• comparison of the candidate digital signature with at least one of the previously recorded authentic digital signatures, in order to issue a positive or negative decision about acceptance of the candidate fibrous medium,
• characterised in that:
• the structural characteristic of the candidate fibrous medium and the structural characteristic(s) of the authentic fibrous medium(a) are obtained scanning a volume of the medium,
• the comparison is intended to use a statistical method to determine a similarity index between the candidate digital signature and the authentic digital signature, and to compare this similarity index with a given acceptance threshold, the acceptance threshold being chosen so as to enable issuing a positive acceptance decision if the candidate digital signature does not exactly correspond to the authentic digital signature with which it is compared.