CN109726788B - Light and shade double-code two-dimensional code with hidden metamerism - Google Patents
Light and shade double-code two-dimensional code with hidden metamerism Download PDFInfo
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Abstract
A dark and light double-code two-dimensional code with hidden metamerism is characterized in that a dark code two-dimensional code image is implanted into another clear code two-dimensional code image through a metamerism color matching algorithm, a halftone screening technology and an information hiding technology to generate a special two-dimensional code image with the dark and light double-codes, the two-dimensional code image can read information of the clear code two-dimensional code image under visible light, the dark code two-dimensional code image information can be read under infrared light, through contrast analysis of the light and dark two-dimensional code information, whether a printed product is a genuine product or not can be represented, if the two-dimensional code image is copied in a counterfeit mode, due to the fact that the two-dimensional code image loses the color characteristics of the metamerism, the dark code two-dimensional code image is lost, the dark code two-dimensional code image information cannot be read, and whether counterfeit piracy problems of printed products such as labels, bills and securities exist or not can be identified through the characteristics.
Description
Belongs to the technical field of:
the invention relates to an anti-counterfeiting printing technology, in particular to a metamerism hidden light and dark double-code two-dimensional code which can be used for anti-counterfeiting of various printed products.
Background art:
at present, the common anti-counterfeiting methods comprise the following methods: the first one is laser anti-fake mark, which is one kind of anti-fake label printed with laser invisible ink and fluorescent ink. The second is a cipher anti-fake label, the method is that each product is coded with a group of digital codes, the codes of each product are different, the digital codes are printed on the label and covered, and the digital codes are stored in a computer database which can be inquired by consumers, when the consumers buy the products, the digital codes on the labels are input into the computer database by telephone or network computer to compare and identify, the same is true, the different is false, the method is simple, the identification is easy, the label is not easy to forge, but in the actual use, the coded data is printed on the label after the coded data is generated uniformly by the computer. The coded data representing the true and false of the product can be illegally copied and counterfeited, and meanwhile, the code can also be used for recovering the code making label on the product which is not inquired and is pasted on the false product, so that the anti-counterfeiting effect is difficult to ensure. The third one is texture anti-fake, which is anti-fake with the texture characteristic on the label, but it is difficult to forge, because only the sequence number of the label is set and the label is a plain code, each label can be inquired repeatedly, and the counterfeiter can forge in batches according to the characteristic after copying the sequence number on the label and the necessary texture characteristic reflected in the inquiry, i.e. whether there is a phenomenon in the square by the warehouse keeper or salesperson. The fourth one is metamerism ink anti-counterfeiting, which is an anti-counterfeiting printing technology based on metamerism phenomenon, i.e. the anti-counterfeiting is realized by utilizing the phenomenon that two substances present the same color under one light source but different colors under the other light source, but the proportion of metamerism is easy to measure, so the anti-counterfeiting effect is difficult to guarantee.
In summary, the existing anti-counterfeit methods have certain disadvantages, and thus cannot prevent counterfeit products from being radically.
In summary, the existing anti-counterfeit methods have certain disadvantages, and thus cannot prevent counterfeit products from being radically.
The invention content is as follows:
aiming at overcoming the defects of the prior anti-counterfeiting printing technology of various printed products, the invention improves the prior art by aiming at the defects of the prior anti-counterfeiting printing technology of various printed products, provides a dark and light double-code two-dimensional code with hidden metamerism, the two-dimensional code implants one dark two-dimensional code image into the other bright two-dimensional code image through a metamerism color matching algorithm, a half-tone screening and an information hiding technology to generate a special two-dimensional code image with the dark and light double-code, the two-dimensional code image can read the information of the bright two-dimensional code image under visible light and can read the information of the dark two-dimensional code image under infrared light, the two-dimensional code image can be used for representing whether the printed products are genuine products or not through the contrast analysis of the dark and light two-dimensional code information, if the two-dimensional code image is copied in a counterfeit mode, the dark two-dimensional code image is lost because the two-dimensional code image loses the color characteristic of the metamerism, therefore, the image information of the two-dimensional code of the secret code can not be read out, and the characteristic can be used for identifying whether printed matters such as printed labels, bills and securities have the problem of counterfeit infringement.
Cyan, yellow and black, four colors are generally described by CMYK, metamerism generally means that color printed CMYK four color inks form a set of matched color matching inks that are perceived as the same color under visible light, i.e., the same color; under infrared light, the CMYK four-color ink shows different colors due to different mixture ratios, namely, heterochromatism, and the phenomenon is called metamerism phenomenon.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method comprises the steps of forming a two-dimensional code image by using plain code information, forming a two-dimensional code image by using concealed code information, wherein the two-dimensional code image is called a concealed code two-dimensional code image, color blocks in color block images of the concealed code two-dimensional code image and the plain code two-dimensional code image both contain two color blocks of black color blocks and white color blocks, in order to hide the concealed code two-dimensional code image in the plain code two-dimensional code image, the concealed code two-dimensional code image and the plain code two-dimensional code image are printed on the same position of a page in a completely overlapped mode, the color blocks of the concealed code two-dimensional code image and the color blocks of the plain code two-dimensional code image are overlapped in a one-to-one correspondence mode, the color blocks overlapped in the one-to-one correspondence mode can be divided into four types, the first type color block plain code two-dimensional code image requires to appear white under visible light, the concealed code two-dimensional code image requires white under infrared light, the second type color block plain code two-dimensional code image requires black under visible light and the concealed code image requires white under infrared light, the third category of color-block plain code two-dimensional code images requires white color under visible light and the dark code two-dimensional code images requires black color under infrared light, the fourth category of color-block plain code two-dimensional code images requires black color under visible light and the dark code two-dimensional code images requires black color under infrared light,
adopting CMYK four-color ink to generate four groups of color matching ink with matched proportion, wherein the four-color ink proportion of the first group of color matching ink is C1M1Y1K1And the first group of matching color inks are made to see the same white under visible light and infrared light through proportion matching, and the four-color ink proportion of the second group of matching color inks is C2M2Y2K2And the second group of matching ink is black seen under visible light and white seen under infrared light by proportional color matching, and the third group of matching ink has a four-color ink ratio of C3M3Y3K3And the third group of color matching ink is white seen under visible light and black seen under infrared light through proportional color matching, and the fourth group of color matching ink has a four-color ink proportion of C4M4Y4K4And the fourth group of color matching ink is made to see the same black under visible light and infrared light through proportional color matching,
the black-white color blocks of the dark code two-dimensional code image are used for modulating the color blocks of the bright code two-dimensional code image, so that the corresponding color blocks of the dark code two-dimensional code image and the bright code two-dimensional code image which need to show white under visible light and infrared light are printed by adopting a first group of color matching inks, the corresponding color blocks of the bright code two-dimensional code image which need to show black under visible light and the dark code two-dimensional code image which need to show white under infrared light are printed by adopting a second group of color matching inks, the corresponding color blocks of the bright code two-dimensional code image which need to show white under visible light and the dark code two-dimensional code image which need to show black under infrared light are printed by adopting a third group of color matching inks, and thus the areas printed by overlapping the dark code two-dimensional code image and the bright code two-dimensional code image are printed by adopting a fourth group of color matching inks, the bright code two-dimensional code image is displayed under visible light, the bright code two-dimensional code image information can be read out in a scanning mode, the dark code two-dimensional code image is displayed under infrared light, the dark code two-dimensional code image information can be read out in a scanning mode, and the metamerism bright-dark double-code two-dimensional code image is generated.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a block diagram of a generation of a metamerism light and dark double-code two-dimensional code image.
Fig. 2 is a block diagram of identification of a metamerism light and dark double-code two-dimensional code image.
FIG. 3 is a block diagram of distinguishing true from false for metamerism bright-dark double-code two-dimensional code images.
FIG. 4 is a flowchart of a generation process of a metamerism bright-dark double-code two-dimensional code image.
Fig. 5 is a partial diagram corresponding to the clear code two-dimensional code image and the dark code two-dimensional code image.
Detailed Description
In fig. 1, 4 and 5, a two-dimensional code image is formed by using plain code information, which is called a plain code two-dimensional code image, and a two-dimensional code image is formed by using concealed code information, which is called a concealed code two-dimensional code image, color blocks in color block images of the concealed code two-dimensional code image and the plain code two-dimensional code image both contain two color blocks of black color block and white color block, in order to hide the concealed code two-dimensional code image in the plain code two-dimensional code image, the concealed code two-dimensional code image and the plain code two-dimensional code image are printed on the same position of a page in a completely overlapped manner, and the color blocks of the concealed code two-dimensional code image and the color blocks of the plain code two-dimensional code image are overlapped in a one-to-one correspondence manner, the color blocks overlapped in a one-to-one correspondence manner can be divided into four types, the first type color block 1 plain code two-dimensional code image requires to appear white under visible light and the concealed code two-dimensional code image requires white under infrared light, the second type color block 2 plain code two-dimensional code image requires black color under visible light and the concealed code image requires infrared light White appears under light, a third category of color block 3 clear code two-dimensional code image requires white appears under visible light and a dark code two-dimensional code image requires black appears under infrared light, a fourth category of color block 4 clear code two-dimensional code image requires black appears under visible light and a dark code two-dimensional code image requires black also appears under infrared light,
adopting CMYK four-color ink to generate four groups of color matching ink with matched proportion, wherein the four-color ink proportion of the first group of color matching ink is C1M1Y1K1And the first group of matching color inks are made to see the same white under visible light and infrared light through proportion matching, and the four-color ink proportion of the second group of matching color inks is C2M2Y2K2And the second group of matching ink is black seen under visible light and white seen under infrared light by proportional color matching, and the third group of matching ink has a four-color ink ratio of C3M3Y3K3And the third group of color matching ink is white seen under visible light and black seen under infrared light through proportional color matching, and the fourth group of color matching ink has a four-color ink proportion of C4M4Y4K4And the fourth group of color matching ink is made to see the same black under visible light and infrared light through proportional color matching,
the black-white color blocks of the dark code two-dimensional code image are used for modulating the color blocks of the bright code two-dimensional code image, so that the corresponding color blocks of the dark code two-dimensional code image and the bright code two-dimensional code image which need to show white under visible light and infrared light are printed by adopting a first group of color matching inks, the corresponding color blocks of the bright code two-dimensional code image which need to show black under visible light and the dark code two-dimensional code image which need to show white under infrared light are printed by adopting a second group of color matching inks, the corresponding color blocks of the bright code two-dimensional code image which need to show white under visible light and the dark code two-dimensional code image which need to show black under infrared light are printed by adopting a third group of color matching inks, and the corresponding color blocks of the dark code two-dimensional code image and the bright code two-dimensional code image which need to show black under visible light and infrared light are printed by adopting a fourth group of color matching inks, thereby generating a special two-code image containing light and dark codes,
in fig. 2 and 3, the special two-dimensional code image can read information of a plain code two-dimensional code image under visible light, and can read information of a dark code two-dimensional code image under infrared light, and the information is used for representing whether a printed matter is a genuine product through comparison and analysis of the light and dark two-dimensional code information.
Claims (1)
1. A dark and light double-code two-dimensional code with hidden metamerism is characterized in that: a two-dimensional code image is formed by clear code information, which is called a clear code two-dimensional code image, a two-dimensional code image is formed by dark code information, which is called a dark code two-dimensional code image, color blocks in color block images of the dark code two-dimensional code image and the clear code two-dimensional code image both contain two color blocks of black color blocks and white color blocks, in order to hide the dark code two-dimensional code image in the clear code two-dimensional code image, the dark code two-dimensional code image and the clear code two-dimensional code image are printed on the same position of a page in a completely overlapped mode, the color blocks of the dark code two-dimensional code image and the color blocks of the clear code two-dimensional code image are overlapped correspondingly one by one, the color blocks overlapped correspondingly one by one are divided into four types, the first type color block and clear code two-dimensional code image requires to appear white under visible light, the dark code two-dimensional code image requires to also appear white under infrared light, the second type color block and clear code two-dimensional code image requires to appear white under visible light, the third category of color-block plain code two-dimensional code images requires white color under visible light and the dark code two-dimensional code images requires black color under infrared light, the fourth category of color-block plain code two-dimensional code images requires black color under visible light and the dark code two-dimensional code images requires black color under infrared light,
adopting CMYK four-color ink to generate four groups of color matching ink with matched proportion, wherein the four-color ink proportion of the first group of color matching ink is C1M1Y1K1And the first group of matching color inks are made to see the same white under visible light and infrared light through proportion matching, and the four-color ink proportion of the second group of matching color inks is C2M2Y2K2And the second group of matching ink is black seen under visible light and white seen under infrared light by proportional color matching, and the third group of matching ink has a four-color ink ratio of C3M3Y3K3And the third group of color matching ink is white seen under visible light and black seen under infrared light through proportional color matching, and the fourth group of color matching ink has a four-color ink proportion of C4M4Y4K4And the fourth group of color matching ink is made to see the same black under visible light and infrared light through proportional color matching,
the black-white color blocks of the dark code two-dimensional code image are used for modulating the color blocks of the bright code two-dimensional code image, so that the corresponding color blocks of the dark code two-dimensional code image and the bright code two-dimensional code image which need to show white under visible light and infrared light are printed by adopting a first group of color matching inks, the corresponding color blocks of the bright code two-dimensional code image which need to show black under visible light and the dark code two-dimensional code image which need to show white under infrared light are printed by adopting a second group of color matching inks, the corresponding color blocks of the bright code two-dimensional code image which need to show white under visible light and the dark code two-dimensional code image which need to show black under infrared light are printed by adopting a third group of color matching inks, and thus the areas printed by overlapping the dark code two-dimensional code image and the bright code two-dimensional code image are printed by adopting a fourth group of color matching inks, the bright code two-dimensional code image is displayed under visible light, the bright code two-dimensional code image information can be read out in a scanning mode, the dark code two-dimensional code image is displayed under infrared light, the dark code two-dimensional code image information can be read out in a scanning mode, and the metamerism bright-dark double-code two-dimensional code image is generated.
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| CN113269289A (en) * | 2021-05-14 | 2021-08-17 | 北京印刷学院 | Method for generating multispectral composite anti-counterfeiting image and printed matter |
| CN113762446B (en) * | 2021-08-13 | 2023-05-05 | 北京印刷学院 | Multi-color spectrum-multi-spectrum composite anti-counterfeiting two-dimensional code based on CMYK common ink |
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| US8460781B2 (en) * | 2007-06-05 | 2013-06-11 | Xerox Corporation | Infrared encoding of security elements using standard xerographic materials |
| US9892585B2 (en) * | 2009-08-25 | 2018-02-13 | Xerox Corporation | Magnetic watermarking of a printed substrate by metameric rendering |
| US8261988B2 (en) * | 2009-11-30 | 2012-09-11 | Xerox Corporation | Phase locked IR encoding for peened 2D barcodes |
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| CN101819647A (en) * | 2010-05-08 | 2010-09-01 | 福建鸿博印刷股份有限公司 | Anti-counterfeiting printing method by using invisible two-dimensional codes |
| CN103093265A (en) * | 2011-11-07 | 2013-05-08 | 天津奥柏科技发展有限公司 | Anti-fake method for bills or commodities |
| CN105131718A (en) * | 2015-09-16 | 2015-12-09 | 永发印务(东莞)有限公司 | Anti-counterfeiting metamerism ink as well as preparation method and printing method of anti-counterfeiting metamerism ink |
| CN108985420A (en) * | 2018-08-01 | 2018-12-11 | 深圳大学 | A kind of decoding method and decoding system of information code |
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