CN102831567A - Multilayer Moire encryption method for anti-counterfeiting images - Google Patents
Multilayer Moire encryption method for anti-counterfeiting images Download PDFInfo
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- CN102831567A CN102831567A CN2012102241075A CN201210224107A CN102831567A CN 102831567 A CN102831567 A CN 102831567A CN 2012102241075 A CN2012102241075 A CN 2012102241075A CN 201210224107 A CN201210224107 A CN 201210224107A CN 102831567 A CN102831567 A CN 102831567A
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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, particularly a kind of anti-counterfeiting image multilayer More method of encrypting.
Background technology
Development along with moulding holographic technology; The laser hologram image manufacturing technology is widely used in the false proof of trade mark, certificate, credit card and securities etc., and in order to improve the anti-counterfeiting power of holographic security technology, many enterprises have carried out new developing to anti-fake product; The encryption holographic security technology has been proposed; Wherein used Mohr theory to encrypt, i.e. two overlapping phenomenons that produce moir of striped that frequency is identical, the striped frequency of encrypted patterns just can not produce moir and manifest encrypted patterns otherwise change wherein; This encryption holographic security technology is that to belong to optical encryption false proof; Whether visible according to light path that is adopted and password, can be divided into " manifesting type " enciphered method that need not separate chip and " hidden-type " enciphered method that need separate the chip decoding, More's encryption anti-counterfeiting technology is that original literal or pattern-information are hidden on the anti-counterfeiting mark; Separate chip through special same frequency then and come out literal or the pattern displaying hidden, this technology is mainly used in makes the encryption anti-counterfeiting label.More's method of encrypting of prior art use at present is in the pattern that will encrypt, and making encrypted patterns main body lines is that equally spaced parallel lines constitute grating, adds the assorted point or the pattern of stochastic distribution therein; Make encrypted patterns fuzzy invisible, uses identical with the encrypted patterns grating frequency when separating chip and covering on the pattern, through covering the assorted perhaps pattern of putting; Encrypted patterns will display; Though realized the enciphering hiding pattern,, this method has two defectives; After assorted point of interpolation or method of patterning are used the understanding chip on a, the encrypted patterns; Pattern is general show do not have an original clear patterns, if a plurality of encrypted patterns mutual superposition can be more unintelligible, the method that therefore adds assorted point can't realize that the multilayer More encrypts; B: encrypted patterns can not be hiding fully; Might obviously display, if any More's encryption method be to be the method that the black and white strip conversion realize to encrypt comes implicit pattern through the conversion phase place, adopt the chequered with black and white small dislocation translation of striped implicit pattern; Also can be described as and done the simple displacement of lines soon live width of lines section translation or certain slight distance that misplaces at pattern place; Decode and manifest encrypted patterns through separating chip, reach the purpose of encryption, the shortcoming of this method is: this lines displacement method is because receive the factor affecting such as thickness, spacing of black and white lines; Make encrypted patterns understand indistinct manifesting; Hide hiding and to deal with improperly or even manifest encrypted patterns very significantly, mainly is to make the chap of people's visual inspection sensation lines, and the pattern of being hidden is manifesting clearly sometimes; Though this method hidden method is simple, finds the existence of encrypting easily and copy simple; Also belong to traditional method just like in addition a kind of, traditional method is to generate a kind of encrypt file through adding assorted point or pattern, separates the chip observation of decoding through same frequency; Under the same situation of frequency,, form illusion through mixing point or pattern covers on moire pattern; Cover up the thing of encrypting, the patterned surfaces performance be exactly assorted point or pattern, the problem of existence is: this method is that encrypted patterns is hidden in assorted point perhaps below the pattern; And can not be hidden in other pattern the insides, and must there be an independent zone to be used for the hiding moire pattern of assorted point, promptly do Mohr's circle with an independent zone; Assorted point blocks, and separates it out with the chip of separating of same frequency then, assorted some effect is arranged promptly attractive in appearance and barely satisfactory above the aesthetic appearance; At this moment design is gone up must be had an independent place to arrange assorted point and can not arrange to need the content that is provided with, have the moire pattern of assorted point can not be embedded into other pattern the inside because assorted some characteristics be itself promptly be black and white be again the point of mixing; Restriction to whole pattern is very big, and an independent place must be arranged, and designs the zone of an assorted point and gives the client; The original sign of made now is more and more littler, becomes increasingly complex, and encrypts the whole structure that is certain to influence other if be the More separately; Except antiforge function, such laser hologram print product is difficult to satisfy the demand of client for special technique in the packing, particularly to exquisite pattern; Bright gloss, the requirement of rich colors.
Summary of the invention
The object of the invention be exactly for overcome defective that above-mentioned prior art exists, provide a kind of master pattern arbitrarily down the concealed encrypted pattern of stack, need not specific region, clear, the hiding a kind of anti-counterfeiting image multilayer More encryption method that property is good, anti-counterfeit capability is strong of decoding encrypted patterns.
The objective of the invention is to accomplish through following technical scheme:
A kind of anti-counterfeiting image multilayer of the present invention More encryption method; Wherein: superpose at least on the holographic carrier master pattern of stock and be provided with an infill layer figure line; Said encryption figure line obtains the parallel lines bunch grating pattern that constitutes by certain frequency through the grating processing encrypted; Tiny change takes place in the parallel lines of said grating pattern frequency bunch in encryption figure line zone; The tiny change of said its frequency is exactly that the camber line shape sweep of one section equidirectional fluctuation bunch is set between the Origin And Destination that is overlapping of parallel lines bunch and encryption figure line; Make overlapping being hidden under the holographic carrier master pattern of grating pattern of encryption figure line; Other be provided with frequency with this grating pattern identical separate chip; State the holographic carrier master pattern through the said chip observation post that separates, promptly identical said of two frequencies separate chip overlapping with said grating pattern and rotation makes under the identical situation of its grating orientation, when said holographic carrier master pattern is obvious, parallel lines bunch position produces moir and the sweep that is overlapping with encryption figure line bunch is located moire-free and make that encryption figure line is clear and manifest and identify.
Anti-counterfeiting image multilayer More encryption method of the present invention; Wherein: said camber line shape sweep bunch is camber line shape " arch bridge " the sigmoid line bunch of level and smooth protruding one section equidirectional fluctuation between encryption figure line and parallel lines bunch starting point that is overlapping and terminal point; Spacing is little between its starting point and the terminal point; Then camber line is short and radian is little, otherwise the spacing between its starting point and the terminal point greatly, then camber line is long and radian is big.
Anti-counterfeiting image multilayer More encryption method of the present invention; Wherein: identical and the grating pattern that grating orientation is different of several grating frequencies is set on the said holographic carrier master pattern; Adopt frequency identical separate the chip decoding, obtain the different encrypted pattern and accomplish anti-counterfeiting image multilayer More and encrypt through separating the chip different rotation angle.
Anti-counterfeiting image multilayer More encryption method of the present invention, wherein: when the multilayer More encrypted, the frequency of said each layer sweep bunch was identical, only is 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 said any two grating patterns are not less than 15 °.
Anti-counterfeiting image multilayer More encryption method of the present invention; Wherein: said encrypted patterns is handled with the mode of computer code and is manufactured grating pattern; The frequency of computing machine adjustment encrypted patterns, line bunch direction, the line bunch straight line that thickness constituted bunch and with its sweep bunch one to one, and make and separate chip.
The present invention has following remarkable advantage:
1, the encrypted patterns of More's encryption method making of the present invention needs the chip of separating of CF to decode, and just can see implicit pattern, does not influence the observing effect of original laser security pattern simultaneously;
2, it is better that encrypted patterns of the present invention is hidden property; Even can not differentiate whether in the original laser security pattern, whether be concealed with encryption figure line; Realize encrypted patterns and conventional holographic effect pattern stack use; The promptly conventional hologram pattern and the stack setting of encrypted patterns, and very little to the influence of other pattern elements, solved the limitation that former traditional More encrypts use;
3, the integral body setting that is provided with master pattern of encrypted patterns of the present invention does not influence, and does not need being set up in parallel of individual region, and apparent property is perfect more;
4, the present invention realizes that the multilayer More encrypts, and promptly in identical position, can see different decoding patterns with separating the different angle of chip rotation, comprises literal and figure line, promptly along with the angle of separating the chip rotation is different, and decoding a plurality of different patterns that come out;
5, through experiment test, this More's encryption method is adapted at observing the decoding pattern under the white light, has also catered to client and consumer's environment of observation.
Description of drawings:
Fig. 1: the synoptic diagram that is a kind of anti-counterfeiting image individual layer More method of encrypting embodiment of the present invention;
Fig. 2: the synoptic diagram that is a kind of anti-counterfeiting image multilayer More method of encrypting embodiment of the present invention;
Fig. 3: the schematic diagram that is a kind of anti-counterfeiting image multilayer More method of encrypting embodiment of the present invention.
Embodiment:
To combine specific embodiment, accompanying drawing that the present invention is done detailed introduction below:
As shown in Figure 1; Be a specific embodiment of the present invention, on stock 1, be provided with holographic carrier master pattern 2; Stack is provided with an infill layer figure line 3 on holographic carrier master pattern 2; More's method of encrypting used in the present invention is the encryption figure line 3 that the encryption figure line 3 that has literal is encrypted needs through chequered with black and white striated pattern to be carried out the conversion of grating processing encrypted process grating pattern 9, line 3 is schemed in encryption is hidden in the carrier master pattern 2, said carrier master pattern 2 and same frequency separate chip 4 overlapping alignment the time; Can reproduce by the encryption figure line of hiding 3; Because the encryption figure line 3 hidden is gratings of shape of stripes, encryption is that the grating pattern 9 by the equally spaced parallel lines of certain frequency bunch constitutes, and said frequency is meant the lines number in the parallel lines of unit length; The direction of frequency is meant the direction of parallel lines, the identical grating pattern that is meant that the lines number is identical in unit length, line weight is identical of said frequency.As shown in Figure 2; Be with a literal in the encryption figure line 3 " my god " be example; In the said encryption figure line 3 " my god " word obtains forming (as shown in Figure 2) by the grating pattern 9 that the parallel lines of certain frequency bunches 7 constitutes through the grating processing encrypted; Said encryption figure line 3 " my god " word and parallel lines bunches 7 after amplifying manyfold just as Fig. 2 can see; Be to express for ease and can express and explain just to amplify explanation; Actual is very meticulous literal; The present invention is applied in the holographic security technology by the relation of the figure line of computer research microcosmic and lines and the phenomenon that shows, and tiny change takes place the straight line of the said grating pattern 9 among Fig. 2 bunches 7 frequency in encryption figure line zone 8, and the tiny change of said its frequency is exactly that the camber line shape sweep of one section 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 point 12; Make that the grating pattern 9 of encryption figure line 3 is overlapping to be hidden in the holographic carrier master pattern 2 times; As shown in Figure 2, other be provided with frequency with this grating pattern 9 identical separate chip 4, seen among the figure separate chip be an illustration express have a parallel lines bunch separate chip 4; Be amplified only have a signal effect separate chip 4; The parallel lines of separating chip 4 in practical application bunches 7 be very fine and closely woven, but the chip of separating with light transmission is observed said holographic carrier master pattern 2 through the said chip 4 of separating, promptly identical said of two frequencies separate chip 4 and said grating pattern 9 overlapping and rotate make under the identical situation of its grating orientation, when said holographic carrier master pattern 2 is obvious; Parallel lines bunch 7 positions produce moir and sweep bunch 13 place's moire-frees of being overlapping with encryption figure line 3 and make that encryption figure line 3 is clear and manifest and identify; Be said separate chip 4 with encryption figure line 3 " my god " the word place of being overlapping moire-free produces and identifies encryption figure line 3, separating that chip is overlapping and block in Fig. 2 " my god " part of word, this part just show half " my god " word; In like manner; Separate the whole overlapping coverings of chip " 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 the grating pattern 9; And the trickle change on these frequencies is not using said outward appearance of separating chip 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 the word is: said camber line shape sweep bunches 13 is camber line shape " bridge " sigmoid lines bunches 13 of one section equidirectional fluctuation of between each starting point 11 that encryption figure line 3 and parallel lines bunches 7 is overlapping and each terminal point 12, setting up; This sweep bunches 13 and parallel lines bunches 7 is level and smooth slowly lines of transition; Spacing is little between its starting point 11 and the terminal point 12; Then camber line is short and radian is little, otherwise the spacing between its starting point 11 and the terminal point 12 greatly, then camber line is long and radian is big.Use grating frequency with encryption figure line 3 identical when to separate chip 4 be to cover on the holographic carrier master pattern 2 on the identical angle of frequency direction with specific angle; Said direction of separating the grating of chip 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 to when the angle of the parallel lines of angle and the encryption figure line 3 that separate chip 4 grating orientations bunches 7 is overlapping; The sweep of this sweep bunches 13 will highlight; Other same frequency zone produces irregular, moir at random, and the sweep place of sweep bunches 13 just can not produce moir, just can differentiate the encrypted content of being given prominence to.And difference with the prior art of the present invention also is: be the requirement that does not have diffraction direction in the plain paper printing, and the grating orientation of in laser holographic pattern is used, separating chip 4 will cooperate the diffraction direction of encryption figure line 3 can clearly show encryption figure line 3.
As shown in Figure 3 is the schematic diagram of a kind of anti-counterfeiting image multilayer More method of encrypting embodiment of the present invention.In said stock 1; On the said holographic carrier master pattern 2 through adopting the grating processing encrypted that the identical and encryption figure line 3 of two angle positions that the grating angle is different of frequency is arranged; Decoding time rotation is separated chip 4 and is made and separate chip 4 and conciliate chip 4-2 position and can manifest two encryption figure line 3-1 and 3-2 separating chip 4-1 position; Through rotation separate chip 4 from two different grating orientations in other words conj.or perhaps two different grating angles grating pattern of decoding show two encryption figure line 3-1, the 3-2 that is hidden; The holographic carrier master pattern of observing this time 2 is identical with original the observation also; Adopt frequency and encryption figure line 3 be encrypted as the frequency of grating pattern 9 identical separate chip 4 and decode in, separate and in grating angle 4-1, decode encryption figure line 3-1 on the chip 4, separate chip 4 in second grating angle 4-2 through rotation; Present embodiment is separated chip 4 rotations and is obtained different encrypted figure line 3-2 for 30 °; Promptly when the parallel lines of using grating angle 4-1 and encryption figure line 3-1 bunches 7 is overlapping, can see encryption figure line 3-1, when the parallel lines of use grating angle 4-2 and encryption figure line 3-2 bunches 7 is overlapping, can see encryption figure line 3-2, promptly present embodiment has been hidden two encryption figure lines; Under unwitting situation; Can't judge holographic carrier master pattern 2 places and be concealed with one or several encryptions figure line 3, two grating orientation angles of said two encryption figure line 3-1 and 3-2 are not less than 15 °, because in the holographic false proof image; Because the holographic false proof image has diffraction phenomena; If two encrypted patterns 3-1, two grating angle directions of 3-2 angle are less than 15 °, two encryption figure line 3-1,3-1 being manifested can produce the phase mutual interference, make encrypt the figure line show clear inadequately.Through separating chip 4 rotations, just accomplish two layers of More that manifest anti-fake encrpted figure line two positions and encrypt like this.In like manner, when the multilayer More encrypted, the frequency of said each layer sweep bunches 13 was identical, only is sweep bunch 13 each have their own radians, curvature and the degree of depth.
The present invention can also be provided with the grating encryption figure line 3 of several grating orientations on said holographic carrier master pattern 2, constitute anti-counterfeiting image multilayer More and encrypt.For example shown in Figure 3; Two grating encryption figure line 3-1 and 3-2 that grating orientation is different are set on said 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 that the literal of grating orientation 4-2 is formed, these two encrypt figure line 3-1,3-2 constitute the two-layer More's encrypted patterns of anti-counterfeiting image, two the grating orientation 4-1 and the 4-2 angle of said two grating encryption figure lines 3 should be not less than 15 °; Since just can be luminous under certain angle after observation holographic laser pattern is that optical diffraction is arranged, if two encrypted patterns of two angle too small can produce the phase mutual interference.
Encrypted patterns according to the invention is handled with the mode of computer code, and frequency, line orientations, line weight that figure line 3 is encrypted in the computing machine adjustment constitute the random wave Slippage that the wave group forms.For cooperating top pattern to encrypt, can use the software that some professional pattern lines are handled.
The pattern that it is good that the present invention adopts encryption goes out the film (comprise and separate chip); Film sheet turns over mask plate, through the method for mask photoetch, with the design transfer of the film to photoresist; Translate into the nickel version then; Observe the encryption and decryption effect, adopt encryption method of the present invention after, can in antifalsification label, be used with conventional laser anti-counterfeiting characteristic.
Claims (6)
1. anti-counterfeiting image multilayer More encryption method; It is characterized in that: superposeing at least on the holographic carrier master pattern (2) of stock (1) is provided with an infill layer figure line (3); Said encryption figure line (3) obtains the grating pattern (9) by parallel lines bunch (7) formation of certain frequency through the grating processing encrypted; Tiny change takes place in the parallel lines of said grating pattern (9) bunch (7) frequency in encrypting figure line zone (8); The tiny change of said its frequency be exactly parallel lines bunch (7) and encrypt starting point (11) that figure line (3) is overlapping and terminal point (12) between the camber line shape sweep bunch (13) of one section equidirectional fluctuation is set; Make overlapping being hidden under the holographic carrier master pattern (2) of grating pattern (9) of encryption figure line (3); Other be provided with frequency with this grating pattern (9) identical separate chip (4); Observe said holographic carrier master pattern (2) through the said chip (4) of separating; Promptly identical said of two frequencies separate chip (4) overlapping with said grating pattern (9) and rotation makes under the identical situation of its grating orientation, when said holographic carrier master pattern (2) is obvious, parallel lines bunch (7) position produce moir 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 and manifest and identify.
2. anti-counterfeiting image multilayer More encryption method according to claim 1; It is characterized in that: said camber line shape sweep bunch (13) is camber line shape " arch bridge " the sigmoid line bunch (13) of one section equidirectional fluctuation of level and smooth convexity between encryption figure line (3) and parallel lines bunch starting point that (7) are overlapping (11) and terminal point (12); Spacing is little between its starting point (11) and the terminal point (12); Then camber line is short and radian is little, otherwise the spacing between its starting point (11) and the terminal point (12) greatly, then camber line is grown and radian is big.
3. anti-counterfeiting image multilayer More encryption method according to claim 2; It is characterized in that: said holographic carrier master pattern (2) is gone up overlapping identical and the grating pattern (9) that grating orientation is different of several grating frequencies that is provided with; Adopt the chip (4) of separating of a same frequency to decode, obtain different encrypted figure line (3) and then accomplish anti-counterfeiting image multilayer More encryption through separating chip (4) different rotation angle.
4. a kind of anti-counterfeiting image multilayer More encryption method according to claim 2; It is characterized in that: when the multilayer More encrypts; The frequency of said each layer sweep bunch (13) is identical, only is 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 2, it is characterized in that: two grating orientation angles of said any two grating patterns (9) are not less than 15 °.
6. a kind of anti-counterfeiting image multilayer More encryption method according to claim 1; It is characterized in that: said encryption figure line (3) is handled with the mode of computer code and is manufactured grating pattern (9), the frequency of computing machine adjustment encrypted patterns, line bunch direction, the line bunch straight line that thickness constituted bunch (7) and with its sweep bunch (13) and separate chip (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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| CN103802517A (en) * | 2014-02-19 | 2014-05-21 | 湖南工业大学 | Grating anti-counterfeiting technology based on fractal |
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| CN107644581A (en) * | 2016-07-22 | 2018-01-30 | 昆山科技大学 | Anti-fake fabric |
| 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 |
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| CN110751083A (en) * | 2019-10-17 | 2020-02-04 | 曹轶 | Gem image feature identification method based on homomorphic encryption protection |
| CN111477095A (en) * | 2020-05-19 | 2020-07-31 | 广州一品一码科技有限公司 | Compound safe antifalsification label of multilayer |
| CN113156792A (en) * | 2021-02-09 | 2021-07-23 | 北京理工大学 | Translation holographic multiplexing method based on cascade metasurfaces |
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Cited By (15)
| 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 |
| US9836857B2 (en) | 2013-12-17 | 2017-12-05 | Beijing Zhigu Rui Tuo Tech Co., Ltd. | System, device, and method for information exchange |
| CN103802517A (en) * | 2014-02-19 | 2014-05-21 | 湖南工业大学 | Grating anti-counterfeiting technology based on fractal |
| 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 |
| CN107644581A (en) * | 2016-07-22 | 2018-01-30 | 昆山科技大学 | Anti-fake fabric |
| 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 |
| CN106274098A (en) * | 2016-08-08 | 2017-01-04 | 杭州电子科技大学 | A kind of method utilizing moire phenomenon identification hidden text figure |
| 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 |
| CN108446083A (en) * | 2018-02-24 | 2018-08-24 | 维沃移动通信有限公司 | A kind of verification information display methods, mobile terminal |
| 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 |
| CN110751083A (en) * | 2019-10-17 | 2020-02-04 | 曹轶 | Gem image feature identification method based on homomorphic encryption protection |
| CN110751083B (en) * | 2019-10-17 | 2023-04-18 | 曹轶 | Gem image feature identification method based on homomorphic encryption protection |
| CN111477095A (en) * | 2020-05-19 | 2020-07-31 | 广州一品一码科技有限公司 | Compound safe antifalsification label of multilayer |
| 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 |
| CN113156792A (en) * | 2021-02-09 | 2021-07-23 | 北京理工大学 | Translation holographic multiplexing method based on cascade metasurfaces |
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| CN102831567B (en) | 2014-08-27 |
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