FIELD: printing industry.
SUBSTANCE: it is proposed for protection and authentication of printed products to introduce the latent marker into the reproduced original image by changing the optical densities of the inner regions of the original image. Identity control of printed products is carried out by scanning the printed image and analyzing the distribution of optical densities within a narrow selected tone range of the selected image area. Revealing the fact of existence of the marker introduced in the image indicates the authenticity of the product.
EFFECT: increase of protection latency of printed products.
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|
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