FIELD: technologies for preventing falsification and, in particular, methods for applying a non-reproducible authentication image onto a product.
SUBSTANCE: in accordance to the invention, digitized authentication image is encoded to create encoded concealed image and printed on the print surface of product using pervious printing substance. Concealed image is observed through optical decoder, when optical decoder is above the concealed image.
EFFECT: ensured impossible copying of concealed image and, respectively, increased degree of falsification protection.
3 cl, 8 dwg
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