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...

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