CN102831567B - Multilayer Moire encryption method for anti-counterfeiting images - Google Patents
Multilayer Moire encryption method for anti-counterfeiting images Download PDFInfo
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- CN102831567B CN102831567B CN201210224107.5A CN201210224107A CN102831567B CN 102831567 B CN102831567 B CN 102831567B CN 201210224107 A CN201210224107 A CN 201210224107A CN 102831567 B CN102831567 B CN 102831567B
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Abstract
The invention relates to a holographic anti-counterfeiting printing technology, specially relates to a multilayer Moire encryption method for anti-counterfeiting images. The invention provides a multilayer Moire encryption method for anti-counterfeiting images which are good in clarity and concealing properties and strong in anti-counterfeiting ability of superposed, concealed and encrypted patterns and decoded patterns under any pattern. At least one layer of encrypted textures is superposed on a main holographic carrier pattern; through carrying out encryption on the encrypted textures, linear clusters in a certain frequency are obtained, and then a grating pattern is formed; the frequency of the linear clusters of the grating pattern is changed slightly in the area of the encrypted textures, and the staggered and overlapped parts of the linear clusters of the grating pattern and the encrypted textures are provided with a section of arc-shaped curved line clusters which are fluctuant in the same direction; through a decoding slice with a frequency same as the grating pattern, a situation that the main holographic carrier pattern produces Moire patterns at the positions of the linear clusters and does not produce Moire patterns at the bent line clusters staggered and superimposed with the encrypted textures is observed, so that the encrypted textures are identified; and the design on the encrypted textures has no influence on the overall setting of a main pattern, and the parallel setting in a separate area is not required, therefore, the apparent property is perfect.
Description
Technical field
The present invention relates to the plate-making technology in a kind of holographic false proof printing, a kind of method that particularly anti-counterfeiting image multilayer More encrypts.
Background technology
Development along with moulding holographic technology, laser hologram image manufacturing technology is widely used in trade mark, certificate, credit card and securities etc. false proof, in order to improve the anti-counterfeiting power of holographic security technology, many enterprises have carried out new developing to anti-fake product, encryption holographic security technology has been proposed, wherein used Mohr theory to be encrypted, i.e. two overlapping phenomenons that produce moir Lou Lou patterns of striped that frequency is identical, otherwise changing the wherein striped frequency of encrypted patterns just can not produce moir Lou Lou patterns and manifest encrypted patterns, this encryption holographic security technology is that to belong to optical encryption false proof, whether visible according to adopted light path and password, can be divided into and not need " manifesting type " of decoding piece enciphered method and need " hidden-type " enciphered method of decoding piece decoding, More's encryption anti-counterfeiting technology is that original word or pattern-information are hidden on anti-counterfeiting mark, then by special same frequency decoding piece hiding word or pattern displaying out, this technology is mainly used in making encryption anti-counterfeiting label.The method that the More that currently available technology is used encrypts is in the pattern that will encrypt, making encrypted patterns main body lines is that equally spaced parallel lines form grating, the assorted point or the pattern that add therein stochastic distribution, make encrypted patterns fuzzy invisible, while using the decoding piece identical with encrypted patterns grating frequency to cover on pattern, by covering assorted point or pattern, encrypted patterns will display, although realized enciphering hiding pattern, but, this method has two defects, a, in encrypted patterns, adding the method for assorted point or pattern has used after decoding piece, pattern is general show there is no an original clear patterns, if a plurality of encrypted patterns mutually superpose can be more unintelligible, therefore the method that adds assorted point cannot realize multilayer More and encrypt, b: encrypted patterns can not be completely hiding, likely obviously display, if any More's encryption method be to be that black and white strip conversion realizes the method for encrypting implicit pattern by conversion phase place, adopt the chequered with black and white small dislocation translation of striped implicit pattern, also can be described as and done soon live width of lines section translation at pattern place of the simple displacement of lines, or certain slight distance that misplaces, by decoding piece, decode and manifest encrypted patterns, reach the object of encryption, the shortcoming of this method is: this lines displacement method is because be subject to the thickness of black and white line, the factor impacts such as spacing, make indistinct the manifesting of encrypted patterns meeting, hide to hide and to deal with improperly or even to manifest very significantly encrypted patterns, mainly to make the chap of people's visual inspection sensation lines, hiding pattern is manifesting clearly sometimes, although this method hidden method is simple, but easily find the existence of encrypting and copy simple, also just like another, belong to traditional method, traditional method is to generate a kind of encrypt file by adding assorted point or pattern, by the observation of decoding of the decoding piece of same frequency, in the situation that frequency is the same, by mixing point or pattern covers on moire pattern, form illusion, the thing of encrypting is covered up, what patterned surfaces showed is exactly assorted point or pattern, the problem existing is: this method is that encrypted patterns is hidden in below assorted point or pattern, and can not be hidden in other pattern the insides, must there is an independent region for the hiding moire pattern of assorted point, with an independent region, do Mohr's circle, assorted point blocks, then use the decoding piece of same frequency its solution out, there is assorted some effect attractive in appearance and barely satisfactory above aesthetic appearance, at this moment in design, must there is an independent place to arrange assorted point and can not arrange the content that need to arrange, there is the moire pattern of assorted point can not be embedded into other pattern the inside, because assorted some feature be itself be black and white be again assorted point, very large to the restriction of whole pattern, must there is an independent place, design the region of an assorted point to client, the original sign of made is now more and more less, become increasingly complex, if be separately More, encrypt the whole structure that is certain to affect other, except antiforge function, such laser hologram print product is difficult to meet client for the demand of special technique in packing, particularly to exquisite pattern, bright gloss, the requirement of rich colors.
Summary of the invention
Object of the present invention is exactly in order to overcome defect that above-mentioned prior art exists, a kind of concealed encrypted pattern that superposes under master pattern is arbitrarily provided, without specific region, decoding encrypted patterns is clear, hiding good, anti-counterfeit capability is strong a kind of anti-counterfeiting image multilayer More encryption method.
The object of the invention is to complete by the following technical programs:
A kind of anti-counterfeiting image multilayer of the present invention More encryption method, wherein: on the holographic carrier master pattern of stock, at least stack is provided with an infill layer figure line, described encryption figure line is processed to encrypt by grating and is obtained the grating pattern that the parallel lines bunch by certain frequency forms, there is tiny change in the parallel lines of described grating pattern frequency bunch in encryption figure line region, the tiny change of described its frequency is exactly that the arc line shaped sweep bunch of one section of equidirectional fluctuation is set between the Origin And Destination that is overlapping of parallel lines bunch and encryption figure line, make overlapping being hidden under holographic carrier master pattern of grating pattern of encryption figure line, separately be provided with the decoding piece identical with the frequency of this grating pattern, by described decoding piece, observe described holographic carrier master pattern, and the rotation overlapping with described grating pattern of two frequencies are identical described decoding piece makes in situation that its grating orientation is identical, when described holographic carrier master pattern is obvious, parallel lines bunch position produces moir Lou Lou patterns, and locate moire-free with the sweep bunch that encryption figure line is overlapping and make that encryption figure line is clear to be manifested and identify.
Anti-counterfeiting image multilayer More encryption method of the present invention, wherein: described arc line shaped sweep bunch is arc line shaped " arch bridge " the sigmoid line bunch of one section of equidirectional fluctuation of level and smooth projection between the starting point that is overlapping in encryption figure line and parallel lines bunch and terminal, between its starting point and terminal, spacing is little, camber line is short and radian is little, otherwise spacing between its starting point and terminal greatly, camber line is long and radian is large.
Anti-counterfeiting image multilayer More encryption method of the present invention, wherein: the identical and grating pattern that grating orientation is different of several grating frequencies is set on described holographic carrier master pattern, adopt the decoding piece decoding that frequency is identical, by decoding piece different rotation angle, obtain different encrypted patterns and complete anti-counterfeiting image multilayer More and encrypt.
Anti-counterfeiting image multilayer More encryption method of the present invention, wherein: when multilayer More encrypts, the frequency of described each layer of sweep bunch is identical, is only sweep bunch each have their own radian, curvature and the degree of depth.
Anti-counterfeiting image multilayer More encryption method of the present invention, wherein: two grating orientation angles of described any two grating patterns are not less than 15 °.
Anti-counterfeiting image multilayer More encryption method of the present invention, wherein: described encrypted patterns is processed and manufactured grating pattern by the mode of computer code, computing machine adjust straight line that frequency, line bunch direction, the line bunch thickness of encrypted patterns form bunch and with its sweep bunch one to one, and make decoding piece.
The present invention has following remarkable advantage:
1, the encrypted patterns that More's encryption method of the present invention is made, needs the decoding piece decoding of characteristic frequency, just can see implicit pattern, does not affect the observing effect of original laser security pattern simultaneously;
2, encrypted patterns hiding of the present invention is better, even can not differentiate and whether in original laser security pattern, whether be concealed with encryption figure line, realize encrypted patterns and conventional holographic effect pattern stack use, be conventional hologram pattern and the stack setting of encrypted patterns, and the impact on other pattern elements is very little, solved the limitation that former traditional More encrypts use;
3, arranging the not impact of the whole installation of master pattern of encrypted patterns of the present invention, does not need being set up in parallel of individual region, and apparent property is more perfect;
4, the present invention realizes multilayer More encryption, in identical position, decoding piece is rotated to different angles and can see different decoding patterns, comprises word and figure line, and, along with the angle of decoding piece rotation is different, decoding is a plurality of different patterns out;
5,, through experiment test, this More's encryption method is adapted at observing decoding pattern under white light, has also catered to client and consumer's environment of observation.
accompanying drawing explanation:
Fig. 1: the schematic diagram that is the embodiment of the method for a kind of anti-counterfeiting image individual layer More encryption of the present invention;
Fig. 2: the schematic diagram that is the embodiment of the method for a kind of anti-counterfeiting image multilayer More encryption of the present invention;
Fig. 3: the schematic diagram that is the embodiment of the method for a kind of anti-counterfeiting image multilayer More encryption of the present invention.
embodiment:
Below in conjunction with specific embodiment, accompanying drawing, the present invention will be described in detail:
As shown in Figure 1, it is a specific embodiment of the present invention, on stock 1, be provided with holographic carrier master pattern 2, on holographic carrier master pattern 2, stack is provided with an infill layer figure line 3, the method that More used in the present invention encrypts is the encryption figure line 3 with word to be carried out to grating processing enciphering transformation by chequered with black and white striated pattern to the encryption figure line 3 of needs encryption make grating pattern 9, encryption figure line 3 is hidden in carrier master pattern 2, during decoding piece 4 overlapping alignment of described carrier master pattern 2 and same frequency, the encryption figure line 3 can reproducing being hidden, because hiding encryption figure line 3 is gratings of shape of stripes, encryption is that the grating pattern 9 by the equally spaced parallel lines of certain frequency bunch forms, described frequency refers to the lines number in the parallel lines of unit length, the direction of frequency refers to the direction of parallel lines, described frequency is identical refers to that number of lines order is identical in unit length, the grating pattern that line weight is identical.As shown in Figure 2, be encrypt a word in figure line 3 " my god " be example, in described encryption figure line 3 " my god " word processes to encrypt by grating and obtain forming (as shown in Figure 2) by parallel lines bunch 7 grating patterns that form 9 for certain frequency, described encryption figure line 3 " my god " word and parallel lines bunches 7 after amplifying manyfold just as Fig. 2 can see, for convenient expression, also can express and illustrate just to amplify explanation, actual is very meticulous word, the present invention is that the computer research figure line of microcosmic and the relation of lines and the phenomenon that shows are applied in holographic security technology, in encryption figure line region 8 interior frequencies, there is tiny change in the straight line of the described grating pattern 9 in Fig. 2 bunches 7, the tiny change of described its frequency is exactly that the arc line shaped sweep of one section of equidirectional fluctuation bunches 13 is set between each starting point 11 of being overlapping of straight line bunches 7 and encryption figure line 3 and each terminal 12, make that the grating pattern 9 of encryption figure line 3 is overlapping is hidden in holographic carrier master pattern 2 times, as shown in Figure 2, separately be provided with the decoding piece 4 identical with the frequency of this grating pattern 9, the decoding piece of seeing in figure is the decoding piece 4 with parallel lines bunch that illustration is expressed, it is the decoding piece only with signal effect 4 having amplified, the parallel lines of decoding piece 4 in actual applications bunches 7 is very fine and closely woven, but the decoding piece with light transmission, by described decoding piece 4, observe described holographic carrier master pattern 2, and the rotation overlapping with described grating pattern 9 of two frequencies are identical described decoding piece 4 makes in situation that its grating orientation is identical, when described holographic carrier master pattern 2 is obvious, parallel lines bunch 7 positions produce moir Lou Lou patterns, and sweep bunch 13 place's moire-frees that are overlapping with encryption figure line 3 and make that encryption figure line 3 is clear to be manifested and identify, be described decoding piece 4 with encryption figure line 3 " my god " the word place of being overlapping moire-free produces and identifies encryption figure line 3, overlapping the blocking of decoding piece in Fig. 2 " my god " part of word, this part just show half " my god " word, in like manner, the whole overlapping coverings of decoding piece " my god " word, will manifest one complete " my god " word, at this moment can see the anti-counterfeiting information of encryption figure line 3 on grating pattern 9, and trickle change in these frequencies is not being used the outward appearance of described decoding piece 4 direct visual inspection holographic carrier master patterns 2 not observe, the principle analysis signal that Here it is encrypts and decode.
As shown in Figure 2, of the present invention " my god " details of encrypting in word is: described arc line shaped sweep bunches 13 is arc line shaped " bridge " sigmoid lines bunches 13 of one section of equidirectional fluctuation of setting up between encryption figure line 3 and parallel lines bunch 7 each starting points 11 that are overlapping and each terminal 12, this sweep bunches 13 and parallel lines bunches 7 is level and smooth slowly lines of transition, between its starting point 11 and terminal 12, spacing is little, camber line is short and radian is little, otherwise spacing between its starting point 11 and terminal 12 greatly, camber line is long and radian is large.When the use decoding piece 4 identical with the grating frequency of encryption figure line 3 is to cover on holographic carrier master pattern 2 in the angle that frequency direction is identical with specific angle, the direction of the grating of described decoding piece 4 rigidly connects near consistent with the grating of encryption figure line 3, just the enciphered message that manifests encryption figure line 3, it is also understood that as the angle when the angle of decoding piece 4 grating orientations and the parallel lines of encryption figure line 3 bunches 7 is overlapping time, the sweep of this sweep bunches 13 will highlight, other same frequency region produces irregular, random moir Lou Lou patterns, and the sweep place of sweep bunches 13 just can not produce moir Lou Lou patterns, just can differentiate outstanding encrypted content.And difference with the prior art of the present invention is also: be the requirement that there is no diffraction direction in plain paper printing, and the grating orientation of decoding piece 4 will coordinate the diffraction direction of encryption figure line 3 can clearly show encryption figure line 3 in laser holographic pattern application.
The schematic diagram of the embodiment of the method for a kind of anti-counterfeiting image multilayer More encryption of the present invention as shown in Figure 3.In described stock 1, on described holographic carrier master pattern 2, by adopting grating to process to encrypt, there is the identical and encryption figure line 3 of two angle positions that grating angle is different of frequency, in the time of decoding, rotating decoding piece 4 makes decoding piece 4 can manifest two encryption figure line 3-1 and 3-2 in decoding piece 4-1 position and decoding piece 4-2 position, by rotation decoding piece 4 from two different grating orientations in other words conj.or perhaps two different grating angles grating pattern of decoding show two hidden encryption figure line 3-1, 3-2, the holographic carrier master pattern 2 of observing this time is also identical with original observation, when proportion and encryption figure line 3 are encrypted as decoding piece 4 decodings that the frequency of grating pattern 9 is identical, on decoding piece 4, in grating angle 4-1, decode encryption figure line 3-1, by rotating decoding piece 4 in second grating angle 4-2, the present embodiment decoding piece 4 rotates 30 ° and obtains different encryption figure line 3-2, when the parallel lines bunches 7 of using grating angle 4-1 and encryption figure line 3-1 is overlapping, can see encryption figure line 3-1, when the parallel lines bunches 7 of using grating angle 4-2 and encryption figure line 3-2 is overlapping, can see encryption figure line 3-2, be that the present embodiment has been hidden two encryption figure lines, in unwitting situation, holographic carrier master pattern 2 places be cannot judge and one or several encryptions figure line 3 are concealed with, two grating orientation angles of described two encryption figure line 3-1 and 3-2 are not less than 15 °, because in holographic false proof image, because holographic false proof image has diffraction phenomena, if two encrypted patterns 3-1, two grating angle direction angles of 3-2 are less than 15 °, two encryption figure line 3-1 that manifest, 3-1 can produce phase mutual interference, encryption figure line is shown clear not.By decoding piece 4, rotate like this, just complete two layers of Mores' encryption that manifest anti-fake encrpted figure line two positions.In like manner, when multilayer More encrypts, the frequency of described each layer of sweep bunches 13 is identical, is only sweep bunch 13 each have their own radians, curvature and the degree of depth.
Encryption figure line 3 of the present invention can utilize the mode of computer code to process and manufacture grating pattern 9, the frequency of figure line 3 is encrypted in computing machine adjustment, line bunch direction, the straight line that line bunch thickness forms bunches 7 and with its sweep bunches 13 and decoding piece 4 one to one, make that the grating pattern 9 of encryption figure line 3 is overlapping is hidden in holographic carrier master pattern 2 times, or make encryption figure line 3 incorporate other holographic element patterns, make the encryption figure line can be completely hiding, can on holographic carrier master pattern 2, obviously not find out encrypted patterns, if lines are excessively thick, the degree of depth of projection is excessive, gray scale is crossed mostly may obviously see indistinct encrypted patterns on holographic carrier master pattern 2.The grating encryption figure line 3 of at least one grating orientation is set on holographic carrier master pattern 2 of the present invention, and described grating orientation can be any direction.
The present invention can also arrange the grating encryption figure line 3 of several grating orientations on described holographic carrier master pattern 2, forms anti-counterfeiting image multilayer More and encrypts.Example as shown in Figure 3, two grating encryption figure line 3-1 and 3-2 that grating orientation is different are set on described holographic carrier master pattern 2, one is that grating orientation is the little encryption figure line 3-1 of 4-1, another is the encryption figure line 3-2 of the word composition of grating orientation 4-2, encrypt figure line 3-1 for these two, 3-2 forms the two-layer More's encrypted patterns of anti-counterfeiting image, two grating orientation 4-1 and the 4-2 angle of described two grating encryption figure lines 3 should be not less than 15 °, because after observation holographic laser pattern is to have optical diffraction, under certain angle, just meeting is luminous, if two encrypted patterns of two angle too small can produce phase mutual interference.
Encrypted patterns of the present invention is processed by the mode of computer code, and frequency, line orientations, the line weight of computing machine adjustment encryption figure line 3 forms the random wave Slippage that wave group forms.For coordinating pattern above to encrypt, can use the software that some professional pattern lines are processed.
The present invention adopts the pattern of having encrypted to go out the film (comprising decoding piece), film turns over mask plate, by the method for mask photoetch, by the design transfer of the film to photoresist, then translate into nickel version, observe encryption and decryption effect, adopt after encryption method of the present invention, can in antifalsification label, be used in conjunction with conventional laser anti-counterfeiting characteristic.
Claims (6)
1. an anti-counterfeiting image multilayer More encryption method, it is characterized in that: on the holographic carrier master pattern (2) of stock (1), at least stack is provided with an infill layer figure line (3), described encryption figure line (3) is processed and is encrypted the grating pattern (9) obtaining by parallel lines bunch (7) formation of certain frequency by grating, there is tiny change in the parallel lines of described grating pattern (9) bunch (7) frequency in encrypting figure line region (8), the tiny change of described frequency be exactly parallel lines bunch (7) and encrypt starting point (11) that figure line (3) is overlapping and terminal (12) between the arc line shaped sweep bunch (13) of one section of equidirectional fluctuation is set, make overlapping being hidden under holographic carrier master pattern (2) of grating pattern (9) of encryption figure line (3), separately be provided with the decoding piece (4) identical with the frequency of this grating pattern (9), by described decoding piece (4), observe described holographic carrier master pattern (2), and the rotation overlapping with described grating pattern (9) of two frequencies are identical described decoding piece (4) makes in situation that its grating orientation is identical, when described holographic carrier master pattern (2) is obvious, parallel lines bunch (7) position produces moir Lou Lou patterns, and with encrypt sweep bunch (13) that figure line (3) is overlapping and locate moire-free and make that encryption figure line (3) is clear to be manifested and identify.
2. anti-counterfeiting image multilayer More encryption method according to claim 1, it is characterized in that: described arc line shaped sweep bunch (13) is arc line shaped " arch bridge " the sigmoid line bunch (13) of one section of equidirectional fluctuation of level and smooth projection between encryption figure line (3) and the parallel lines bunch starting point that (7) are overlapping (11) and terminal (12), between its starting point (11) and terminal (12), spacing is little, camber line is short and radian is little, otherwise spacing between its starting point (11) and terminal (12) greatly, camber line is long and radian is large.
3. anti-counterfeiting image multilayer More encryption method according to claim 2, it is characterized in that: on described holographic carrier master pattern (2), overlap the identical and grating pattern (9) that grating orientation is different of several grating frequencies, adopt decoding piece (4) decoding of a same frequency, by decoding piece (4) different rotation angle, obtain different encryption figure lines (3) and then complete anti-counterfeiting image multilayer More encrypting.
4. a kind of anti-counterfeiting image multilayer More encryption method according to claim 3, it is characterized in that: when multilayer More encrypts, the frequency of each layer of sweep bunch (13) is identical, is only sweep bunch (13) each have their own radian, curvature and the degree of depth.
5. a kind of anti-counterfeiting image multilayer More encryption method according to claim 3, is characterized in that: two grating orientation angles of any two grating patterns (9) are not less than 15 °.
6. a kind of anti-counterfeiting image multilayer More encryption method according to claim 5, it is characterized in that: described encryption figure line (3) is processed and manufactured grating pattern (9) by the mode of computer code, computing machine adjust straight line bunch (7) that frequency, line bunch direction, the line bunch thickness of encrypted patterns form and with its sweep bunch (13) and decoding piece (4) one to one.
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| CN201210224107.5A CN102831567B (en) | 2012-07-02 | 2012-07-02 | Multilayer Moire encryption method for anti-counterfeiting images |
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| CN201210224107.5A CN102831567B (en) | 2012-07-02 | 2012-07-02 | Multilayer Moire encryption method for anti-counterfeiting images |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015090038A1 (en) * | 2013-12-17 | 2015-06-25 | Beijing Zhigu Rui Tuo Tech Co., Ltd | Information exchange |
| CN103802517B (en) * | 2014-02-19 | 2017-07-11 | 湖南工业大学 | A kind of grating anti-counterfeiting technology based on point shape |
| CN103903216B (en) * | 2014-03-11 | 2017-01-18 | 陕西科技大学 | Determination method based on raster anti-fake concealed image vector diagram line width |
| TWM534099U (en) * | 2016-07-22 | 2016-12-21 | Liang-Yuan Hsiung | Security fabric structure |
| CN106274098B (en) * | 2016-08-08 | 2018-11-02 | 杭州电子科技大学 | A method of identifying hidden text figure using moire phenomenon |
| CN108171642A (en) * | 2016-12-07 | 2018-06-15 | 中国科学院大学 | The asymmetrical optical Information Hiding Techniques of view-based access control model cryptography |
| CN108446083B (en) * | 2018-02-24 | 2022-02-01 | 维沃移动通信有限公司 | Verification information display method and mobile terminal |
| CN110751083B (en) * | 2019-10-17 | 2023-04-18 | 曹轶 | Gem image feature identification method based on homomorphic encryption protection |
| CN111477095B (en) * | 2020-05-19 | 2021-12-17 | 江苏联恒物宇科技有限公司 | Compound safe antifalsification label of multilayer |
| CN113156792B (en) * | 2021-02-09 | 2022-03-18 | 北京理工大学 | Translation holographic multiplexing method based on cascade metasurfaces |
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| CN1962287A (en) * | 2005-11-09 | 2007-05-16 | 四川大学 | Method for making multiple optical watermark |
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