CN107578079B - Anti-counterfeiting method for high-fidelity hidden picture in information code area - Google Patents
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Abstract
The invention provides an anti-counterfeiting method for high-fidelity hidden pictures in an information code area, and relates to the technical field of anti-counterfeiting printing. The method comprises the following steps: adjusting part or all of the information code area to be a table diagram which is optimized for a specific printing system and is suitable for the hidden diagram, and taking the table diagram as a hidden diagram area to obtain an information code table diagram containing the hidden diagram area; the base picture to be hidden is screened and printed in the picture hiding area by the special printing system; when color separation, screening and printing are carried out, part or all of at least one color separation of the hidden image area is half-tone. The method of the invention does not affect the reading and detection of the information code by a code scanning machine or a mobile phone, and simultaneously can hide one or more layers of base pictures under the information code area. The information code of the table picture can be read by conventional means, and the base picture can be read and detected by optical means, scanning means or mobile phone corresponding to the hidden picture, so as to achieve the anti-counterfeiting purpose.
Description
Technical Field
The invention relates to the technical field of anti-counterfeiting printing, in particular to an anti-counterfeiting method for high-fidelity hiding in an information code area.
Background
The information code refers to various printed codes which are integrated with coding, printing, identification, data acquisition and processing and contain information, and comprises common bar codes, two-dimensional codes and other related codes.
A bar code or bar code (barcode) is a graphic identifier in which a plurality of black bars and spaces having different widths are arranged according to a certain coding rule to express a set of information. The universal merchandise bar code generally consists of a prefix portion, a manufacturer code, a merchandise code, and a check code.
The two-dimensional code (2-dimensional barcode) is a black-and-white alternate graph which is distributed on a plane (in a two-dimensional direction) according to a certain rule by using a certain specific geometric graph and is used for recording data symbol information; the code making use of the concept of "0", "1" bit stream forming the internal logic foundation of the computer, using several geometric shapes corresponding to binary system to represent the literal numerical information, automatically reading by image input equipment or photoelectric scanning equipment to realize the automatic processing of information, it has some commonalities of bar code technology, each code has its specific character set; each character occupies a certain width; has certain checking function and the like. Meanwhile, the method also has the functions of automatically identifying information of different rows and processing the graph rotation change points.
The application of information codes is very common and is widely used for product packaging, product identification, link redirection, documents, certificates, tickets and the like at present. Therefore, if the information code region can be protected against forgery, the package, product, document, certificate, bill, etc. to which the information code is attached can be protected against forgery.
The information code (mainly including bar code, two-dimensional code at present) itself has very strong anti-fake demand, along with mobile communication equipment, mobile internet, novel interactive communication mode's popularization, it all becomes a part of daily life to sweep the sign indicating number and unblank, sweep the sign indicating number and link, sweep code link redirection, sweep the sign indicating number payment, but these sweep the sign indicating number action and all probably are deceived by the information code (bar code, two-dimensional code) of impersonation. The graph of the information code is optimized for machine reading, and can not be read by a common person. Unprotected information codes are highly likely to be replaced, tampered with and thus used to fool users. Therefore, the anti-counterfeiting protection of the information code, namely the protection of the information carried by the information code, is more significant.
The art of hiding other images or information in printed images has a long history and is widely used in the field of anti-counterfeiting. The actual displayed image that the viewer can see is called a table diagram; the image which is hidden under the surface picture by a specific technology, can not be distinguished by naked eyes and can be seen by a corresponding detection means, and the information or the information code is called as a base picture; the process of hiding the base map under the table map is called hiding map. The existing graph hiding technologies are various, and most of the existing graph hiding technologies are based on digital screening and comprise methods of screen angle modulation, net point frequency modulation, net line frequency modulation, net point shape modulation, net line phase modulation, net point phase modulation, bidirectional net point (net line) phase modulation, dynamic moire and the like. The basic principle of these methods is: the method comprises the steps of starting from an initial reference screen dot system structure, modulating the system structure of the reference screen dot screen according to the graph of the hidden graph and the requirements of the hidden graph, wherein the modulation method comprises the size, the shape, the black and white, the position, the phase, the density, the frequency, the angle and the like of the screen dots. The high-fidelity hidden map method hides one or more layers of high-definition base maps under high-quality black-and-white or color surface maps under the condition of keeping the high fidelity of the surface maps, and the most representative high-fidelity hidden map technology comprises SI technology of Graphics Security System company, ICI technology of Jura company and high-fidelity hidden map digital screening technology with patent application numbers of 201610519053.3 and 201610518384.5.
The anti-counterfeiting purpose of the conventional printing is anti-counterfeiting, namely, similar or identical printed matters are prevented from being counterfeited, so that the emphasis is on preventing copying, high-definition scanning reconstruction and counterfeiting copying. The characteristics of the hidden image anti-counterfeiting technology determine the double advantages of the hidden image anti-counterfeiting technology in terms of anti-simulation and anti-information tampering, and the hidden image anti-counterfeiting technology is a very effective method for preventing information code information from being tampered or illegally changed, but the technology of the hidden image anti-counterfeiting technology is limited in that the hidden image is only suitable for a half-tone area of a table image. Information codes such as bar codes and two-dimensional codes are generally printed on a white (or light-colored blank substrate) background by using black (or pure dark color) with maximum contrast for the convenience of detection and reading. Therefore, in general, the image hiding technology cannot be directly used in the conventional information code area such as a bar code and a two-dimensional code.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an anti-counterfeiting method for high-fidelity image hiding in an information code region, which does not affect the reading and detection of the information code by a code scanning machine or a mobile phone and the like, and can hide one or more layers of base images in the information code region. The information code of the table picture can be read by conventional means, and the base picture can be read and detected by optical means, scanning means or mobile phone corresponding to the hidden picture, so as to achieve the anti-counterfeiting purpose.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an anti-fake method for high-fidelity hidden picture in information code region includes screening and printing anti-fake hidden picture in partial or whole region of information code region table picture, hiding one or more layers of base pictures, and covering half-tone area in at least one color separation region by 1% or more and 99% or less.
Further, the region of the hidden image includes a part of the information code background region, a whole information code background region, a part of the information code dark region, a whole information code dark region or a whole information code region.
Further, if the region of the hidden image includes a part or all of the background region of the information code, the table image of the information code is a table image of the background with a base image, the background table image and the part or all of the dark region of the information code are not printed simultaneously, the printing of the background table image is prior to or subsequent to the printing of the dark region of the information code, and the printing of the dark region of the information code is adjacent to or overlapped with the background table image.
Further, the information code table image is obtained by dividing a certain background or background image into a dark area and a light area by an information code pattern, and then performing different image transformations on the dark area and the light area respectively; the image transformation includes, but is not limited to, one or a combination of color transformation, gray-scale transformation, and adjustment or replacement of color tones.
Further, the base map includes character string information or pattern features of at least a part of the information code.
Further, when the base map is detected to be read, the information of the detected base map is compared with the information code information or the information code pattern of the table map.
Further, if the base map comprises pattern features of at least a part of the information codes, when the base map is detected and read, the information code patterns of the table map and at least a part of the information code patterns of the base map are simultaneously displayed to form simultaneous comparison.
Further, if the base map includes pattern features of at least a part of the information codes, when the base map is detected to be read, the information code patterns of the table map and at least a part of the information code patterns of the base map are in close proximity or contact with each other to form a geometric alignment, and the geometric alignment includes but is not limited to one or a combination of translation, mirror image, symmetry, inversion, rotation, scaling, shearing and distortion.
Further, the detection and reading method of the base map includes, but is not limited to, optical means reading, photographic or scanning reading, machine reading or mobile phone reading.
Furthermore, the hidden map adopts a high-fidelity hidden map screening method based on direct correction or a high-fidelity hidden map screening method based on a screen.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention provides an anti-counterfeiting method for high-fidelity hidden pictures in an information code area, which is suitable for anti-counterfeiting hidden pictures by optimizing the image processing of the information code area and the pictures adjacent to the information code area, and simultaneously ensures that the information codes of the table pictures can be read by a conventional method; further, the hidden base map is optimized, and according to the content and pattern of the table map information code, a part of graphs or contents in the base map are associated or compared with the table map through creation or transformation to form one-to-one correspondence between the table map and the base map, so that the anti-counterfeiting effect is further enhanced. The anti-counterfeiting method of the information code provided by the invention is a printing anti-counterfeiting mode of the information code, does not influence the normal reading and detection of the information code by a code scanning machine or a mobile phone, and the like, can hide one or more layers of base pictures under the information code area, can detect the base pictures by optical means and scanning means corresponding to the hidden pictures or mobile phone reading, and thus achieves the anti-counterfeiting purpose.
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Fig. 1 is a flowchart of an anti-counterfeiting method for high fidelity hiding in an information code region according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
An anti-counterfeiting method for high-fidelity hiding of pictures in an information code area is shown in figure 1, and the specific method is as follows.
Step 1: the information contained in the information code is sorted, and the information comprises one or more of but not limited to website addresses, website links, public addresses, public links, telephone numbers, variable codes, character combinations, number combinations and the like, and the information is processed by an information code generator (such as a bar code and a two-dimensional code generator) to generate an information code (such as a bar code and a two-dimensional code) pattern.
Step 2: and carrying out corresponding image processing on the generated information code pattern to obtain an information code table diagram and one or more layers of base diagrams suitable for the hidden diagram.
The method for obtaining the information code table diagram suitable for the hidden diagram comprises the following steps:
step a: dividing the generated information code pattern into an information code pattern black area and an information code pattern background area, wherein the black area can also be other dark areas, contains the characteristics of the information code and is a readable part; the background area is generally white;
step b: converting the black area of the information code pattern, and converting the background area of the information code pattern, wherein the conversion method comprises one mode or a combination of multiple modes of gray scale conversion, color conversion and image conversion; changing the black area of the transformed information code pattern into a dark area pattern, and changing the background area of the transformed information code pattern into a light area pattern;
step c: and synthesizing the dark area pattern and the light area pattern to obtain the information code table chart halftone pattern suitable for the hidden chart.
Hiding an image or information is typically achieved by modulating the halftone dots of the printed matter in some specified manner, and thus the carrier of the hidden image or information is the halftone dots (or lines). That is, the hiding can be realized only in the halftone dot region of the printing, and the hiding cannot be realized by dot modulation in the blank region or the solid region, and the hiding effect (contrast) is limited in the color very close to the blank region or the solid region.
Most conventional printing systems do not have true intrinsic gray scale rendering capability, and can only implement two levels of ink or no ink, such as offset printing, flexography, etc., which is made possible by the screening technique in order to render a gray scale image on a substrate (e.g., paper). Pure solid color, ink area coverage is 100%. Blank areas, completely free of ink, with an area coverage of 0%. Intermediate gray levels need to be achieved by varying the halftone dot coverage, e.g., 1% to 99%. Thus, macroscopic gray scale is achieved by microscopic area coverage of halftone dots.
For example, in conventional four-color printing, all colors in the color gamut of the system can be printed by combining and superimposing the four basic colors cmyk and their half tones. However, some areas of the gamut are less suitable for hiding, such as white space, pure cmyk area, and pure color overlay areas c + m, m + y, c + y, etc. For example, in spot color printing, hiding of a picture cannot be realized in a solid color region of a spot color. Thus, for a particular printing system, including the color combinations of the inks, the separation of colors prior to printing, etc., there will be color regions or areas (solid colors, blank regions, very dark colors, etc.) that are not suitable for hiding. If all or most of the image area is composed of the areas which are not suitable for hiding the picture, the hidden picture can not be realized, the effect is not good or the anti-counterfeiting function is lost.
Therefore, the main criterion of the table image optimization step is to predict whether the halftone (area size, halftone intensity, color separation superposition and the like) in the information code image area is suitable for storing the table image in the subsequent screen-making printing process, and simultaneously, the information code image of the table image needs to have enough contrast and uniformity to be successfully identified and read by a machine.
For the hidden graph technique, the mesh point coverage rate can be realized between 1% and 99%. Among them, the contrast is strongest near the halftone (near 50%). For machine recognition, such as scanning, photography, cell phone recognition, etc., image analysis means, the ability to read the detection base image can be extended to a wide range of halftones, such as 1% to 99% halftones throughout.
The following example is used to analyze the optimization process performed to obtain the information code table diagram suitable for the hidden diagram in the specific implementation.
Table diagram optimization embodiment one
A halftone is used in the information code background region, and a picture is hidden in the halftone background. Preferably with a light background, which may be colored. The printing of the information and the background can be completed at one time, or the background containing the hidden picture can be printed first, and then the information code and the like are printed in the information code area printed with the background when appropriate. The double printing method is especially suitable for the instant input spray printing or printing of the variable information code. The prior background printing can be only printed in the background area of the information code which is predicted in advance, and a black or dark area of the information code is left for the second printing. The prior background printing can also cover the whole information code area, and another layer of ink color is superposed on the information code dark color area during the second printing.
Table diagram optimization embodiment two
The information code is printed in a dark halftone by replacing the solid color of the dark color of the information code, and the halftone area is hidden. For example, a bar code is printed in 80% black halftone, and the halftone of dark line is modulated to hide the image without affecting machine reading, and there is enough space in one thick line of the bar code to hide the Arabic numerals of the whole bar code.
Table diagram optimization embodiment three
The dark and light areas of the information code do not necessarily need to be of completely uniform color, and under certain conditions, as long as the dark and light areas maintain sufficient contrast while maintaining low contrast in the respective areas (dark and light areas), no disturbance is caused to the reading of the information code. For example, the dark area is an image having a gradation range of 60% to 100%, and the light area is an image having a gradation range of 0% to 30%. As another example, the background is a light-ink halftone, such as 70% of Y (yellow), and the dark regions are dark-ink halftones, such as 50% of K (black). Furthermore, the information code can be overlapped to process the image in the subarea from an independent color table picture, the color of the dark color area of the information code is deepened, and the color of the light color area is lightened, so that an information code image with enough contrast is formed, and the requirement of being suitable for the anti-counterfeiting hidden picture is met.
In order to ensure the authenticity of the information code, the invention further copies the content of the table image information code in the base image, and lays a foundation for the comparison of the subsequent step 5. In order to accurately and conveniently compare, when the base map is detected, the base map and the table map are ensured to be simultaneously displayed as much as possible, and the corresponding comparison graphs and characters are overlapped or closely adjacent to each other, so that the comparison and detection can be simultaneously and simultaneously completed.
The method for obtaining the base map comprises the following steps:
and transforming the generated information code pattern in one or a combination of a plurality of modes including but not limited to translation, cutting, scaling, mirror image and the like, and forming one or a plurality of layers of base pictures by the transformed information code pattern and other images needing to be hidden.
The following examples are presented to analyze the optimization of base patterns to enhance anti-counterfeiting functions in specific implementations.
Bottom map optimization embodiment one
And (5) comparing the information. The information of the information code which can be read by a common person, such as Arabic numerals under the bar code, can be copied in the base picture and is hidden in the information code area. For this information, the underlying diagrams may be in different fonts, sizes, etc., i.e., the graphics may not be identical or similar, but may be identical or partially identical in content.
Second embodiment of the base map optimization
And (6) comparing graphs. The information which can not be read by normal people, such as the graph images of the two-dimensional codes and the bar codes, can be hidden in the adjacent area of the corresponding table diagram, when the information is detected, the table diagram and the hidden diagram are displayed at the same time, and the adjacent areas are very easy to compare patterns, thereby identifying the authenticity. For example, a bar code, may hide a copy of the bar pattern translated up (or down) in the background area, either immediately above or below the bar. For another example, the two-dimensional code may use one side of the black area of the two-dimensional code as a reflection line, generate a mirror image of the two-dimensional code as a base image, and hide the light area of the two-dimensional code. During detection, the surface pattern and the bottom pattern appear in mirror image simultaneously to form perfect comparison, and especially in the periphery near the reflection line, the comparison judgment of the image is clear at a glance depending on the symmetry.
The two convenient graph comparison modes are shown, and other geometric deformation, such as translation, inversion, rotation, scaling, mirror image, distortion and other multiple transformations and comprehensive use thereof can be used for optimizing comparison of the hidden image and the base image so as to achieve rapid and accurate comparison and detection.
And step 3: and (3) performing high-fidelity hidden picture screening and printing on the table picture and one or more layers of base pictures of the information codes suitable for the hidden pictures to obtain a printed matter containing the base pictures. The high-fidelity hidden map technology includes, but is not limited to, existing hidden map technologies, such as a high-fidelity hidden map digital screening method and System based on direct correction (application No. 201610519053.3), a high-fidelity hidden map screen digital screening method and System (application No. 201610518384.5), SI technology of Graphics Security System company, ICI technology of JURA company, and the like.
And 4, step 4: the table picture of the hidden picture printed matter containing the information code contains one or more hidden base pictures hidden during the net hanging, and a detection means corresponding to the hidden picture operation is selected to detect the hidden base pictures; the most common hidden picture and detection method is to cover a transparent optical film or plate on the picture, rotate the transparent optical film or plate, and when the position and angle are appropriate, the hidden picture can be detected.
And 5: the detected hidden image is compared with the information code of the original table image, the compared information comprises but is not limited to information characters, patterns and/or shapes, if the comparison is successful, the carrier attached with the information code is a genuine product, the information of the information code is not changed, and if the comparison is unsuccessful, the carrier attached with the information code is a fake product or the information of the information code is changed.
The invention provides a printing anti-counterfeiting mode of an information code (including but not limited to a bar code and a two-dimensional code), which does not influence the reading and detection of the information code by a machine or a mobile phone and can hide one or more layers of base pictures under an information code area. The information code of the table image can be read by conventional means, such as a code scanner or a mobile phone, and the base image can be read by optical means corresponding to the hidden image, including but not limited to scanning detection or mobile phone reading, so as to achieve the anti-counterfeiting purpose. The invention can not only identify the carrier with the information code, but also verify whether the information of the information code is true.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (9)
1. An anti-counterfeiting method for high-fidelity hidden pictures in an information code area is characterized in that: the method comprises the steps of carrying out anti-counterfeiting hidden picture screening and printing in a local or whole area of an information code area table picture, hiding one or more layers of base pictures, wherein the local or whole area of the information code area table picture is called a hidden picture area, and the hidden picture area comprises an area with the half-tone area coverage rate of more than or equal to 1% and less than or equal to 99% on at least one color separation;
the information code region table image is obtained by dividing a certain background or background image into a dark color region and a light color region by an information code pattern, and then respectively carrying out different image transformations on the dark color region and the light color region; the image transformation includes but is not limited to one or a combination of multiple transformations of color transformation, gray scale transformation, and adjustment or replacement of color tone;
the method for obtaining the base map comprises the following steps: and transforming the information code pattern in a mode of one or a combination of multiple modes including but not limited to translation, cutting, scaling and mirroring, and forming one or more layers of base pictures by the transformed information code pattern and other pictures needing to be hidden.
2. The anti-counterfeiting method for hiding high fidelity pictures in the information code area as claimed in claim 1, wherein the anti-counterfeiting method comprises the following steps: the map hiding area comprises a partial information code background area, a whole information code background area, a partial information code dark color area, a whole information code dark color area or a whole information code area.
3. The anti-counterfeiting method for hiding high fidelity pictures in the information code area as claimed in claim 2, wherein the anti-counterfeiting method comprises the following steps: if the hidden image area comprises part or all of the information code background area, the information code area table image is a background table image containing a base image, the background table image and part or all of the information code dark color area are printed in a different mode, the background table image is printed before or after the information code dark color area, and the information code dark color area is printed next to or overlapped with the background table image.
4. The anti-counterfeiting method for hiding high fidelity pictures in the information code area as claimed in claim 1, wherein the anti-counterfeiting method comprises the following steps: the base map includes character string information or pattern features of at least a part of the information code.
5. The anti-counterfeiting method for hiding high fidelity in the information code area as claimed in claim 4, wherein the anti-counterfeiting method comprises the following steps: and when the base map is detected and read, comparing the information of the detected base map with the information code information or the information code pattern of the table map.
6. The anti-counterfeiting method for hiding high fidelity in the information code area as claimed in claim 5, wherein the anti-counterfeiting method comprises the following steps: if the base map comprises pattern features of at least a part of information codes, the information code patterns of the table map and at least a part of information code patterns hidden by the base map appear simultaneously when the base map is detected and read, and simultaneous comparison is formed.
7. The anti-counterfeiting method for hiding high fidelity in the information code area as claimed in claim 5, wherein the anti-counterfeiting method comprises the following steps: if the base map comprises pattern features of at least a part of the information codes, when the base map is detected and read, the information code patterns of the table map and at least a part of the information code patterns of the base map are in close proximity or contact to form a geometric alignment, and the geometric alignment mode comprises but is not limited to one or a combination of translation, mirror image, symmetry, inversion, rotation, scaling, shearing and distortion.
8. The anti-counterfeiting method for hiding the high fidelity pictures in the information code area as claimed in claim 5, 6 or 7, wherein the anti-counterfeiting method comprises the following steps: the detection and reading method of the base map comprises but is not limited to optical means reading, photographic or scanning reading, machine reading or mobile phone reading.
9. The anti-counterfeiting method for hiding high fidelity pictures in the information code area as claimed in claim 1, wherein the anti-counterfeiting method comprises the following steps: the hidden map adopts a high-fidelity hidden map screening method based on direct correction or a high-fidelity hidden map screening method based on a screen.
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