Dynamic Mohr encryption method of anti-counterfeiting image

Abstract

The invention relates to a plate-making technology in holographic anti-counterfeiting printing and particularly relates to a dynamic Mohr encryption method of an anti-counterfeiting image. The invention provides the dynamic Mohr encryption method of the anti-counterfeiting image, which has the advantages of laser hologram, overlapping of a plurality of hidden encrypted patterns, clear decoded encrypted patterns, good hiding performance, continuous vivid representation and dynamic effect; a plurality of layers of related white and black encrypted patterns are overlapped on an anti-counterfeiting identification and are processed by a computer optical grating to obtain parallel straight-line clusters which have the same optical grating frequency and have the different optical grating directions to form an optical grating pattern; the frequency of the parallel straight-line clusters is slightly changed in an encrypted pattern region, namely one section of an arc-shaped bending line cluster which is waved in the same direction is arranged between a starting point and a finishing point of crossing the parallel straight-line clusters and the encrypted pattern; the direction of each layer of the parallel straight-line clusters is rotated, overlapped and hidden according to a related sequence at an equal angle to form a synthesized pattern; and a decoding sheet with the frequency which is the same as that of the optical grating pattern is overlapped on the synthesized pattern to be rotated and observed, and n layers of the related encrypted patterns are obviously displayed in sequence in an animation manner. The dynamic Mohr encryption method of the anti-counterfeiting image improves the anti-counterfeiting capability and is novel.

Description

technical field [0001] The invention relates to a plate-making technology in holographic anti-counterfeiting printing, in particular to a dynamic Moire encryption method for anti-counterfeiting images. Background technique [0002] Holography is a widely recognized optical anti-counterfeiting technology. With the development of embossed holographic technology, laser holographic image production technology is widely used in the anti-counterfeiting of trademarks, certificates, credit cards and securities. In order to improve the security of holographic anti-counterfeiting technology Anti-counterfeiting efforts, many companies have made new developments in anti-counterfeiting products, and proposed encryption holographic anti-counterfeiting technology, which uses Moiré theory for encryption. Moiré encryption holographic anti-counterfeiting technology belongs to optical encryption anti-counterfeiting technology. Some text or pattern information is hidden on the anti-counterfeiti...

AI Technical Summary

Problems solved by technology

At present, when the existing technology uses the moiré principle to perform dynamic effects, the moiré fringe is because the grating moves a little, and the moiré fringe has a very obvious dynamic effect, but the dynamic mode of this dynamic moiré hologram is not yet able to Controlling, that is to say, the appearance of moiré fringes is random, and the direction in which moiré fringes will move is unknown, and the change of moiré fringe shape is uncontrollable. Such moiré fringe holograms are very blind and random , the reproduced moiré pattern is just some meaningless stripes, and the dynamic effect of the moiré pattern is also random, which cannot be described exactly, and it is a pattern with no practical application value.

How to use Moiré technology to produce dynamic effects is an urgent problem for technicians to solve. In addition, the metho

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