公开(公告)号：EP3910548A1

公开(公告)日：2021-11-17

申请号：EP20472005.6

申请日：2020-05-14

申请人： Demax - Holograms AD

发明人： Monovski, Valentin Konstantinov ,  Laskov, Evgenii Atanassov ,  Ivanovskii, Andrii ,  Baldjiev, Anguel Georgiev ,  Tonchev, Dimitar Antonov ,  Dinova, Margita Todorova ,  Dobrev, Mario Roumenov ,  Akuzov, Danail Trendafilov ,  Pogan, Ignat ,  Stoilov, Georgi Ivanov

IPC分类号： G06K9/22 ,  B42D25/30 ,  G06K9/32 ,  G06K9/76 ,  G06K9/78 ,  G07D7/00

摘要： The method relates to the security of the documents and goods from forgery. Its application enhances the protective properties of the diffractive optical variable device by improving the inspection procedure, with automatic recognition of machine-readable features added to visually controlled ones. The following operations are performed: after forming the diffractive optical variable element, it is subjected to verification by launching an application using the algorithm on a smartphone with a camera. The user manually positions the smartphone over the optical variable device (1) and shoots it at two substantially different observation conditions. The images are geometrically straightened and correlated with the original one. From the straightened images, color characteristics are found, dynamic effect parameters are measured and hidden information is decrypted. Upon a successful comparison of the characteristics and parameters with predefined values, the originality of the captured diffractive optical variable device is determined.