TWI609331B - A multi-spectral digital watermark image and manufacturing method therefor - Google Patents

Description

Digital watermark image with multiple spectra and its design method

The invention relates to a watermark image outputted on a physical file and its design The method, in particular, relates to a multi-spectral digital watermark image composed of a two-dimensional barcode, an infrared digital image or an ultraviolet digital image, and a design method thereof.

Binary Code, especially matrix 2D barcode, is currently quite current The anti-counterfeiting design of the line, after converting a lot of information into a binary pattern, converting it into a black and white pattern for presentation to the user, and the user can scan the 2D barcode through a specific device such as a smart mobile device. After that, I learned the message that I protected. Due to the high-capacity information coding, high fault tolerance and easy interpretation, the two-dimensional bar code can be applied at a wide range of levels, including digital and physical information protection.

Image anti-counterfeiting technology is an anti-counterfeiting technology that combines images to apply to physical files. The scope of application is quite wide. For example, it can be applied to valuable physical documents such as banknotes, passports, certificates, stamps or identity cards. The main points to consider when implementing image anti-counterfeiting technology include: (1) Anti-counterfeiting image design (2) printing equipment; (3) the type of ink used; (4) the type of physical documents, etc., in view of the above, in order to successfully design an anti-counterfeit image design that can be practically applied, it is necessary to integrate the above-mentioned various points, however The development of related technologies that integrate the above points is not easy, and therefore there is a need to develop related technologies.

In 2011, at the banknote research conference held in Washington, DC, a novel was proposed. Concept "SIGMA QR 2D barcode image watermarking", this watermark contains 2D barcode, which can be scanned by smart phone to get relevant information instantly, if you can use this SIGMA QR 2D barcode image as watermark The above-mentioned image anti-counterfeiting technology is further embodied, and the scope of its application is inevitably quite extensive. If it can be further applied to the anti-counterfeiting design of a valuable physical file, the anti-counterfeiting effect of the watermark image can be further enhanced. According to this requirement, it is necessary to design a "two-dimensional barcode watermark image" that can simultaneously have "two-dimensional barcode" and "digital image" anti-counterfeiting mechanism, and also needs to provide related design methods.

In order to meet the above needs, the present invention provides a multi-spectral digital watermarking. The image is output on the physical file, which can provide the correct digit and image information, because it can achieve both the digital and image anti-counterfeiting mechanism. The watermark image includes a two-dimensional barcode, an infrared digital image and a ultraviolet digital image, wherein the watermark image is composed of a digital halftone dot, and the above-mentioned dot comprises an amplitude modulation dot. (Amplitude Modulation, AM) and Frequency Modulation (FM); in this watermark image, the dark part is mainly composed of amplitude modulation dots, and the bright area is mainly composed of frequency modulation dots.

In addition, this watermark image allows the user to use only the naked eye without using any optics. When the instrument only sees the two-dimensional bar code, it is convenient for the user to scan the watermark image by using the smart mobile device to obtain the digital information protected by the device; and when the image is inspected by the optical instrument, the present invention can be used. The watermark image presents an infrared digital image or an ultraviolet digital image, respectively, and the image anti-counterfeiting technology is used to enhance the anti-counterfeiting effect of the watermark image.

In order to design the above watermark image, the present invention further provides a multiple light. The design method of the digital watermark image of the spectrum includes the following steps: First, the image design software is used to plan the mask design required to conform to the watermark image; afterwards, the watermark image is obtained by the inkjet output method. The concentration matching guide of the two-dimensional bar code is used to control the dot spread caused by the inkjet output, and the output range of the better neutral gray balance concentration of the infrared digital image is selected; then, the MATLAB program is used. To establish the dot structure of each zone in the watermark image, and according to the above two-dimensional bar code concentration matching guide table, to filter out the ink concentration output range required for each zone in the watermark image; finally, integrate the above The obtained ink concentration output range is combined with five color inks such as cyan, red, yellow, carbon black and fluorescent light to jointly output the watermark image on the physical file.

In order to enable the watermark image provided by the present invention to be effectively applied, the present invention is here. A method for verifying a multi-spectral digital watermark image is also provided. After the multi-spectral digital watermark image of the present invention is output on the physical file, the verification step includes: an optical verification step of scanning the watermark image by an optical instrument and visually viewing the result. The two-dimensional barcode verification step, through the verification tool of the two-dimensional barcode, such as a two-dimensional barcode scanner, etc., whether the watermark image can accurately cover the correct digital information hidden by the two-dimensional barcode; the copy verification step, the watermark map For direct copying, after checking the copied 2D barcode, the correct digital information can be obtained smoothly through the above verification steps.

In summary, the multi-spectral digital watermark image provided by the present invention has both The anti-counterfeiting mechanism of digital and image, with the image anti-counterfeiting mechanism, the user can directly distinguish the authenticity of the watermark image by the naked eye with the aid of the optical instrument with the aid of the verification method provided by the present invention; With the aid of optical instruments, users can also use the 2D barcode scanner to identify the authenticity of the watermark image, and also because of the 2D barcode, infrared digital image and UV bitmap in the watermark image. It is obtained by the design method provided by the present invention, and is composed of a specific ink concentration, thereby increasing the technicality of the design method. In view of the fact that the watermark image contains multiple anti-counterfeiting mechanisms and the design is not easy, it can be applied. Valuable physical documents such as banknotes, passports, certificates, stamps or identity cards strengthen the prevention of illegal copying.

10‧‧‧Multi-spectral digital watermark image

11‧‧‧2D barcode

12‧‧‧Infrared digital image

13‧‧‧UV digital image

14‧‧‧Overlapping area

15‧‧‧Background area

21‧‧‧Amplitude adjustment outlets

22‧‧‧FM network

~Q‧‧‧Two-dimensional barcode mask design background area

~I‧‧‧Infrared digital image mask design background area

~U‧‧‧UV digital image mask design background area

N‧‧‧Amplitude Network AM

N`‧‧‧ FM site FM

∩‧‧‧Collection

∪‧‧‧Intersection

The final result of the H‧‧‧ watermark image

Q‧‧‧Two-dimensional barcode mask design

I‧‧‧mask design of infrared digital image

U‧‧‧mask design for UV digital images

S11~S22‧‧‧Steps S11~S22

FIG. 1 is a schematic diagram of a digital watermark image of a multiple spectrum according to the present invention.

2 is a schematic diagram of a digital watermark image of a multiple spectrum according to the present invention.

FIG. 3 is a schematic diagram of a digital watermark image design flow of the multiple spectrum disclosed in the present invention.

FIG. 4 is a schematic diagram of a networked program for multi-spectral digital watermark images disclosed in the present invention.

FIG. 5 is a schematic diagram of a multi-spectral digital watermark image verification process disclosed in the present invention.

The present invention provides a multi-spectral digital watermark image, the watermark image With multiple anti-counterfeiting verification mechanisms, such as digital verification of two-dimensional barcodes, image verification and copy verification, it can be applied to valuable physical documents such as banknotes, passports, certificates, stamps or identity because of its multiple anti-counterfeiting mechanisms. Certificates, etc., to strengthen the prevention of illegal copying.

In order to enable the present invention to be fully understood by those of ordinary skill in the art, the present invention is provided herein. The embodiments of the present invention relate to the technical content well known to those skilled in the art in the description of the embodiments of the present invention, and are not described herein again. Meanwhile, the style and size of the watermark image are not in accordance with the actual situation. To draw; at the same time, the matrix type two-dimensional barcode in the present invention includes at least the following Kind: DotCode A, MaxiCode, Data Matrix, Aztec Code, QR Code, etc., and in the following description, the QR Code is taken as an embodiment, but the present invention does not limit which two-dimensional barcode is used. In addition, the present invention is not limited herein, and the present invention is not limited thereto.

First, please refer to the contents disclosed in FIG. 1 and FIG. 2, FIG. 1 is a multiple light of the present invention. Schematic diagram of a digital watermark image of a spectrum; FIG. 2 is a schematic diagram of a partial amplification of a digital watermark image of a multiple spectrum of the present invention; wherein, FIG. 2 only shows that the microstructure of the watermark image is The digital halftone composite dot is not used to represent the actual distribution of dot distribution in each zone. First, as shown in FIG. 1, the watermark image 10 of the present invention is mainly composed of a two-dimensional barcode 11 (for example, a matrix two-dimensional barcode), an infrared digital image 12, an ultraviolet digital image 13, an overlapping region 14, and a background. A region 15 is formed; as is apparent from FIG. 1, the overlap region 14 here represents a bar code or image of any two or more of the two-dimensional barcode 11, the infrared digital image 12, and the ultraviolet digital image 13, The area formed by the overlap; in addition, the background area 15 is the non-inking area, and this area does not contain any information. In addition, it should be emphasized that the watermark image 10 of the present invention is composed of a digital halftone composite dot, and as shown in FIG. 2, the dot included therein has an amplitude modulation dot 21 and a frequency modulation dot 22; for example; In the embodiment of the present invention, the dark portion of the watermark image 10 is mainly composed of amplitude modulation (AM) dots 21, and the bright portion is mainly composed of frequency modulation (FM) dots 22.

Please continue to refer to FIG. 2, the amplitude modulation dot 21 mentioned in the embodiment means a digital half. The dot output in the color printing technology, and the dot is a fixed frequency, and may have a unit area of different sizes; the dot of such a state is less prone to dot gain, and thus is suitable for forming a dark portion of the pattern The area. In addition, the FM network point 22 mentioned in the embodiment means a dot outputted in the digital halftone printing technology, and the size of the cell point is fixed, but the dot is The output frequency is not the same. The dot of this kind is easier to expand than the amplitude-adjusting dot 22, and is suitable for forming a bright area in the pattern. Obviously, the watermark image 10 disclosed in the embodiment is composed of the above two kinds of dot blends, and thus is an output aspect of a composite dot, as shown in FIG. 2, the output state can be The distribution and size of the dots represent the tone, and the distribution average has the characteristics of clustering.

Next, the flow of the design method of the watermark image 10 will be described herein, and the content thereof Please refer to FIG. 3 , which is a schematic flowchart of a multi-spectral digital watermark image design method according to the present invention. First, as shown in step S11, the area mask design of the watermark image 10 is planned by the image drawing software. The image drawing software may be Adobe Illustrator, Adobe Photoshop, etc., and the invention is not limited thereto. It is to be noted that the mask design in the present invention means that when a certain area in the watermark image 10 is planned as a two-dimensional barcode 11, the area is set as a mask design of the two-dimensional barcode 11, and therefore, By the mask design of the two-dimensional barcode 11, when the watermark image 10 is outputted (for example, inkjet output), other regions can be effectively prevented (for example, the infrared digital image 12 or the ultraviolet digital image 13) When the information is output, it is arbitrarily mixed in the mask design; in other words, the purpose of the mask design is to ensure the information of the two-dimensional barcode 11 and not be represented by the above digital image. The information of the area is arbitrarily interfered; therefore, when the information of the two-dimensional barcode 11 is read, the information presented by the two-dimensional barcode 11 is not arbitrarily interfered by other information. Similarly, the mask design of the infrared digital image 12 and the ultraviolet digital image 13 can also be planned. By means of the mask design, it can be known what kind of information is desired in each area of the watermark image 10; for example, the infrared digital image 12 or the ultraviolet digital image 13 can be used as digital information, The dimension barcode 11 can be covered as image information or both types. In addition, if you want to cover two or more pieces of information in the same area, you must first use the mask design to grasp the possible location, and in order to prevent the mutual confusion of various information, the required ink concentration output range must also be Do a modest screening; this Part of the technical content is disclosed in the subsequent design steps. Finally, the planned mask design can completely and faithfully present the information to be carried by the watermark image 10.

Then, as shown in step S12, the plurality of devices are output first by way of inkjet output. After the two-dimensional barcode 11 of the threshold matrix of the threshold matrix, the possible ink concentration output values of the infrared digital image 12 and the ultraviolet digital image 13 are compared with each other to form a plurality of combinations (ie, at least: The two-dimensional barcode 11 is combined with the infrared digital image 12, the two-dimensional barcode 11 and the infrared digital image 12, and the ultraviolet digital image 13; and then, after scanning the two-dimensional barcode 11, the situation in which the digital information can be obtained is examined. Finally, combining the above results to produce a two-dimensional barcode 11 concentration matching guide table, the concentration matching guide table is used to indicate the plurality of combinations of the above two-dimensional barcodes after scanning, the ratio of the digital information obtained by each combination; After that, based on this concentration matching guide, the possible ink concentration output range of each zone is planned. Obviously, the two-dimensional barcode concentration matching guide is in the present invention, and one of its design purposes is: when the two-dimensional barcode 11 uses the inkjet output, it may be due to the dot structure, the output device, or the attached physical file. The difference in conditions may cause the dot to expand. Therefore, the two-dimensional bar code concentration matching guide can be used to control the dot expansion to avoid the infrared digital image 12 in the output watermark image 10. The ultraviolet digital image 13 is seen when visually observed by the naked eye, and the overall design effect is destroyed; and the second purpose of using the two-dimensional bar code concentration matching guide is to select the ink concentration that can meet the better neutral gray balance. When the output range is such that the cyan red and yellow colors are output together with the carbon black, the mixed gray can be bright and uniform, thereby avoiding the overall rendering effect of the watermark image 10 of the present invention by the infrared digital image 12 Interference; for example, when the ink density output range of the two-dimensional barcode 11 is not optimal, it may be used by the user after the infrared digital image 12 is output. As seen by the eye, it interferes with the scanning and verification of the two-dimensional barcode 11 in the watermark image 10 of the present invention, thereby affecting the overall anti-counterfeiting effect of the watermark image 10 of the present invention. Be strong here In the embodiment of the present invention, the ink jet output is described. The purpose of the present invention is to explain the industrial applicability of the present invention. Therefore, the embodiment of the present invention is not limited to the ink jet output.

In order to clearly disclose the concentration matching guide described above, the technical content thereof will be described in detail herein. When reading the following contents, please refer to the contents of Tables 1 to 3 at the same time, which is the concentration matching guide disclosed in the present invention. 1 is a multi-spectral digital watermark image of the present invention, which is a two-dimensional barcode and an infrared digital image, and a concentration matching guide established by the ink concentration output range; Table 2 is the present invention. The disclosed multi-spectral digital watermark image, the inner two-dimensional barcode and the infrared digital image, and the intermediate gray balance concentration matching guide established by the two ink concentration output ranges; and Table 3 is disclosed in the present invention. The multi-spectral digital watermark image, the two-dimensional barcode, the infrared digital image and the ultraviolet image, and the concentration matching guide established by the three ink concentration output ranges; and additionally, in the present embodiment, The range of ink concentration output of each zone mentioned is a range of ink concentrations required for outputting each zone in the watermark image 10, and the unspecified part is the range of the background zone of each zone. For example, when the ink density output range of the infrared digital image 12 is 30% to 60%, the background area of the uninked region is 40% to 70%; that is, the sum of the ink concentration values of the two regions is 100%, similarly. Yu Ben 10 yards watermarked image a two-dimensional digital image with ultraviolet ink 13 concentration in the range of its output uninked the background area 11 is also above the range of the relationship.

The infrared watermarks previously studied are mostly digitally based on the ink density output value of 5%. Output, however, the two-dimensional barcode verification machine used in the present invention can verify that the ink concentration is at least 10%, so the watermark image 10 disclosed in the present invention is based on the infrared digital image 12 thereof. The ink density output value is 10%, and the following design procedure is performed as a reference; and at this time, the ink density output value of the ultraviolet digital image 13 is based on 70% to plan the ink concentration output of each region. The range, and after the output of the watermark image 10, the digital verification program of the two-dimensional barcode 11 is performed, and the effective ink concentration output range of each zone is determined by the result of the above verification.

First, as shown in Table 1 below, the watermark image 10 provided by the present invention has infrared rays The ink concentration output range of the digital image 12 matches the two-dimensional barcode density distribution table formed by the ink density output range of the two-dimensional barcode 11 , and the circle symbol represents the two-dimensional barcode 11 at this concentration combination, and the watermark image thereof The infrared digital image 12 in 10 has a hidden effect, so the message of the two-dimensional barcode 11 has a verification result of the readable effect. For example, when the ink density output range of the infrared digital image 12 is 10% to 40%, the ink concentration output range of the two-dimensional barcode 11 can be 15% to 35%, and the combination of the concentrations can be effective 2D barcode 11 The result of the verification, that is, the average person can see the two-dimensional barcode 11 with the naked eye, but the infrared digital image 12 is not visible.

Then, according to the verification result of Table 1, the infrared digital image 12 is further subjected to neutral gray. The matching result of the balanced ink concentration output range, as shown in Table 2, is the concentration matching guide of the neutral gray balance image of the infrared digital image 12, wherein the circle symbol represents the two-dimensional barcode 11 under the corresponding concentration combination, so that the infrared rays The digital image 12 has a better hiding effect, which in turn makes the digital information of the two-dimensional barcode 11 have a better readable effect. For example, similarly, when the carbon black ink concentration output range of the infrared digital image 12 is 10% to 40%, the output range of the blue-red and yellow-color ink density of the two-dimensional barcode 11 is 5% to 20%. In combination, at this time, the infrared digital image 12 in the watermark image 10 has a more hidden effect; it is obvious that the matching ratio required can be selected according to the matching ratio disclosed in Table 2 of the present invention. For example, in an embodiment of the present invention, the infrared black digital image 12 is disclosed as having a preferred neutral gray balance with a carbon black ink concentration ranging from 10% to 20%; The two-dimensional barcode 11 of the Tibetan effect has a blue-yellow-yellow three-color ink density output preferably in the range of 6% to 12%, and the watermark image obtained by the above process (not shown) has an infrared digital image 12 When viewed by the naked eye, it can be viewed by the user, because the watermark image 10 can only present the two-dimensional barcode 11 at this time, so that the user can perform subsequent related verification procedures.

Then, with the verification result of Table 1, the two-dimensional barcode 11 and the infrared number can be performed. The matching result of the bit image 12 and the two-dimensional bar code density matching guide of the ultraviolet digital image 13 is as shown in Table 3, which is an ultraviolet digital image added according to the concentration table established in Tables 1 and 2 above. The matching result of 13, wherein the circle symbol represents the two-dimensional bar code 11 under the corresponding concentration combination, so that the digital message still has a readable verification result. For example, when the ink density output range of the infrared digital image 12 is 10% to 40% and the ink density output range of the ultraviolet digital image 13 is 70%, the ink concentration output range of the ratio and the two-dimensional barcode 11 is When 15% to 35% match, the above combination of concentrations can obtain valid 2D barcode verification results. It should be emphasized that the desired watermark image 10 can be selectively generated in sequence according to the procedure disclosed in the above embodiments of the present invention. For this reason, the matching ratio of the concentration matching guide table of the present invention is not limit.

Then, as shown in step S13, the digital halftone network technology (digitalhalftoning) error diffusion method and ordered dithering method for the distribution of dot distribution to construct the watermark image 10 (as shown in Figure 1, the watermark image 10 includes a microstructure of a two-dimensional barcode 11, an infrared digital image 12, and an ultraviolet digital image 13). Then, as shown in step S14, the MATLAB program is selected to adjust the above-mentioned planning result, and the appropriate ink concentration output range of each area in the watermark image 10 is selected to prevent the above-mentioned dot enlargement phenomenon. In the present embodiment, the area where the design of the two-dimensional barcode 11 mask overlaps with the infrared digital image 12 and the ultraviolet digital image 13 mask design (overlap region 14) is established by the error diffusion method described above. Randomly distributed dots to form the microstructure; and the mask design of the infrared digital image 12 and the ultraviolet digital image 13 adopts the dot matrix method described above, and the threshold matrix with a screen angle of 0 degrees (threshold matrix) To plan its network to form its microstructure; to plan the proportion of the network of the watermarked image 10 of the present invention in each of the regions to establish the microstructure of each region, and to refer to the above established The dimension bar code matching guide table is used to filter out the ink concentration output range of each zone of the watermark image 10 so that the overlap zone 14 can have more than two kinds of information at the same time without being confused with each other. For example, in the embodiment of the present invention, it is disclosed that the ink density output range of the two-dimensional barcode 11 in the watermark image 10 of the present invention is 15% to 35%, and the ink density output range of the infrared digital image 12 is 10% to 20%, the ultraviolet digital image 13 has an ink concentration output range of 70% or more, and has a better output effect in combination with the above.

In order to clearly expose the above MATLAB method to screen out the watermark image The technical content of the appropriate ink concentration output range of each zone will be described with reference to FIG. 4; wherein, FIG. 4 is a schematic diagram of the watermarking image 10 of the present invention being traversed by the MATLAB program. As shown in FIG. 4, after the concentration matching guide of the two-dimensional barcode 11 is established, the appropriate ink concentration output range of each area in the watermark image 10 of the present invention is filtered out; if the selected ink concentration is selected If it is not suitable, mutual interference may occur; for example, when the infrared image of the output infrared image 12 is not suitable for the ink concentration, it may interfere with the rendering effect of the two-dimensional barcode 11 and cause the failure of the two-dimensional barcode digital verification. Further affecting the overall efficiency of the watermark image 10; therefore, in order to minimize the above-mentioned interference phenomenon, in the embodiment of the present invention, the MATLAB program is selected to perform the over-the-air of the watermark image 10 of the present invention. The program, in this way, plans the proportion of the dot points of the watermark image 10 of the present invention, and simultaneously selects the possible ink concentration output range of each zone, wherein the relationship equation of the network program is expressed as: H=(N∩Q)∪(N`∩~Q)∪(N∩I)∪(N`∩~I)∪(N∩U)∪(N`∩~U) where H is the network program The final result of the post-float image; Q is the mask design of the 2D barcode; ~Q is the background area of the mask of the 2D barcode; I is the mask design of the infrared digital image; ~I is the infrared digit map The mask is designed to have its background area; U is the mask design of the ultraviolet digital image; ~U is the background area of the ultraviolet digital image mask; N is the AM dot AM; N` is the FM dot FM; Union; ∪ indicates intersection. Therefore, the present invention can construct the proportion of the dot points of each area in the watermark image 10 of the present invention based on the above equation, and filter out the ink concentration output range of each of the appropriate regions, so that the watermark image 10 can simultaneously It has two different anti-counterfeiting designs with two-dimensional barcode and digital image, and the information of each overlapping area 14 does not interfere with each other.

Finally, as shown in step S14, reference is made to each of the selected watermark images 10 The ink concentration output range of the area is used to output the watermark image 10 of the present invention on the physical file in five color inks such as cyan, red, yellow, carbon black and fluorescent. The watermark image 10 obtained by the above-mentioned disclosed design method can be applied to various physical documents such as banknotes, passports, securities, stamps or identity cards, etc., but the present embodiment only discloses the watermark image 10 The design method does not limit the subject matter of the designed watermark image. Therefore, according to the above description, when the watermark image 10 of the present invention is outputted on a physical file, the watermark image 10 can only see the two-dimensional barcode 11 in the general naked state, and the infrared digital image 12 is The infrared digital image 12 and the ultraviolet digital image 13 are not visible at this time.

In order to make the watermark image 10 of the present invention more efficient in use, the present invention A verification method for providing the watermark image 10 of the present invention is provided. When reading the verification method described below, please refer to FIG. 5; wherein, FIG. 5 is a schematic diagram of the verification process of the watermark image 10 of the present invention. First, the present embodiment is only used to explain the implementation contents of the verification steps in the verification method of the watermark image 10 of the present invention, each of which The order of the verification steps is not limited to the content described in this embodiment, and the order of the verification steps may be arranged according to the different needs of the user and the content disclosed in the embodiment, so that the watermark of the present invention The image 10 is outputted on the physical file at this time, and the watermark image 10 can only see the two-dimensional barcode 11 in the normal naked state, and the infrared digital image 12 and the ultraviolet digital image 13 are not visible at this time. .

As shown in step S21 in FIG. 5, the two-dimensional barcode digital digit of the watermark image 10 of the present invention is shown. The verification step of operating the QR Code App tool software, such as the QR Code barcode scanner, which has been set in the smart mobile device to perform the scanning process of the two-dimensional barcode 11 to verify whether the watermark image 10 can provide the correct digit News.

As shown in step S22 in FIG. 5, the optical verification step of the watermark image 10 is advantageous. The watermark image 10 is scanned by an optical instrument such as an infrared detector or an ultraviolet detector, and the user can directly observe whether it can present the correct infrared digital image 12 by the optical instrument. Ultraviolet digital image 13.

As shown in step S23 in FIG. 5, the copy verification step of the watermark image 10 is The watermarking image 10 performs the copying operation, and then performs the digital verification step of the two-dimensional barcode 11 on the copied document to detect whether the copied watermark image 10 can contain the correct digital information, and if the copied two-dimensional barcode 11 can obtain the correct digital information by the above-mentioned two-dimensional barcode digital verification step, which means that the copied watermark image 10 is obtained through the above design process, which means that the genuine authorization; otherwise, the non-transmission through the above design flow Obtained, that is, identified as pirated counterfeit goods.

In order to more clearly disclose the design method of the watermark image 10, an implementation will be provided herein. For example, please refer to FIG. 1, FIG. 2 and FIG. 3 when reading this embodiment. As mentioned above, the mask design of the watermark image is first planned by the image drawing software, and then the output is output by the inkjet output. A plurality of two-dimensional barcodes 11 having different critical value matrix dots are compared with the possible ink density values of the infrared digital image 12 and the ultraviolet digital image 13, and a concentration matching guide is created through the above steps. Then, based on the concentration matching guide established above, the error diffusion method and the dot matrix tonal method in the digital halftone over-the-network technique are used to plan the distribution of the dots in each area of the watermark image 10 to form a distribution. The micro-structure of the watermark image 10, and the MATLAB program is operated to filter out the ink concentration output range of each region in the watermark image 10; in this embodiment, the ink density output value of the two-dimensional barcode 11 is used. 25%, the ink density output value of the infrared digital image 12 is 10%, the ink density output value of the ultraviolet digital image 13 is 70%; and the ink density output value of the two-dimensional barcode 11 is 30%, the infrared digital image The ink concentration output value of 12 is 10%, and the ink density output value of the ultraviolet digital image 13 is 70%. The combination of the two sets of ink concentration output values is preferred, and finally, the disclosed watermark image 10 is referred to. , the ink concentration required in each area, the five-color ink such as cyan, red, yellow, carbon black and fluorescent light is used to jointly output the watermark image 10 on the physical file; wherein the fluorescent ink constitutes the type of material, In this embodiment There may be three categories: one is an organic fluorescent material having a large conjugated unsaturated molecule; the other is an inorganic fluorescent material synthesized by a high temperature environment; and the third is an organic rare earth complex synthesized by chemical synthesis. Things.

In order to more clearly disclose the verification method of the watermark image 10, relevant realities will be provided herein. For the purpose of explanation, please refer to FIG. 5 when reading this embodiment. As described above, the verification method of the watermark image 10 includes: a digital verification step of the two-dimensional barcode, and the operation flow is as described above, the user operates the QR Code App such as a QR Code barcode scanner, and the output is output on the physical file. The watermark image 10 performs a two-dimensional barcode verification step to check whether the watermark image 10 can contain correct digital information; the optical verification step of the image uses an optical instrument such as an infrared detector or an ultraviolet detector. The watermark image 10 is scanned, and the user can directly observe whether the correct image can be presented through the instrument. The infrared detector has an infrared wavelength range of 0.7 um to 2 um, the ultraviolet detector has an ultraviolet wavelength of 200 nm to 400 nm, preferably 365 nm, and the copy verification step directly copies the watermark image 10. After the action, the digital verification step of the two-dimensional barcode 11 is performed on the copied document, and it is detected whether the copied watermark image 10 can contain the correct digital information, and if the copied watermark image 10 simultaneously presents the two-dimensional barcode 11 and The infrared digital image 12 and the infrared digital image 12 thus interfere with the scanning of the two-dimensional barcode 11 and thus cannot obtain the correct digital information. At this time, it is determined that the copied document is a pirated product; otherwise, if the copied document is used, the two-dimensional barcode 11 If the correct digital information can be obtained by scanning the 2D barcode, it is determined that the copied document is a genuine license.

The verification method disclosed in the above embodiment may be in the order of the verification steps included Use the requirements to make adjustments. For example, you can first verify the steps with the image verification step first, and then check the copy file for the above results by the copy verification step. Finally, the verification step of the 2D barcode 11 is performed to ensure the file. Authentic or not, in addition to the implementation described above, the appropriate verification process can also be planned according to the requirements of use and the verification steps disclosed in the present invention. The above embodiments only indicate the possible implementation process. It cannot be used to limit the aspects of its processes in other embodiments.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; the above description should be understood and implemented by those having ordinary knowledge in the related art, so that the other is not departing from the present invention. Equivalent changes or modifications made by the disclosed concepts are intended to be included in the scope of the claims.

10‧‧‧Watermark image

11‧‧‧2D barcode

12‧‧‧Infrared digital image

13‧‧‧UV digital image

14‧‧‧Overlapping area

15‧‧‧Background area

Claims (7)

A multi-spectral digital watermark image formed by a two-dimensional barcode and an infrared digital image, wherein: an overlapping area is an overlapping area of the two-dimensional barcode and the infrared digital image; a background area is a non-inking area, wherein the watermark image is formed by a digital halftone composite dot of the two-dimensional barcode, and a dark portion of the watermark image is controlled by an amplitude modulation network Forming, a bright portion of the watermark image is composed of frequency modulation dots, and an ink concentration output range of the two-dimensional barcode is 15% to 35%, and the ink concentration output range of the infrared digital image is 10% to 20%. A multi-spectral digital watermark image formed by a two-dimensional barcode and an ultraviolet digital image, wherein: an overlapping area is an overlapping area of the two-dimensional barcode and the ultraviolet digital image; a background area is a non-inking area, wherein the watermark image is formed by a digital halftone composite dot of the two-dimensional barcode, and a dark portion of the watermark image is controlled by an amplitude modulation network Constructing, a bright portion of the watermark image is composed of frequency modulation dots, and an ink concentration output range of the two-dimensional barcode is 15% to 35%, and the ink concentration output range of the ultraviolet digital image is More than 70%. A multi-spectral digital watermark image is formed by a two-dimensional barcode, an infrared digital image and an ultraviolet digital image, and is characterized in that: an overlapping area is the two-dimensional barcode and the infrared digital image And or an overlapping area of any two or three of the ultraviolet digital images; and a background area, which is a non-inking area, wherein the watermark image is a digital halftone composite dot of the two-dimensional barcode To form a microstructure thereof, a dark portion of the watermark image is composed of amplitude modulation dots, a bright portion of the watermark image is composed of frequency modulation dots, and an ink concentration output range of the two-dimensional barcode 15% to 35% of the infrared image of the digital output of the ink concentration in the range of 10-20%, the ultraviolet range of the ink density of an output digital image is 70% or more. The multi-spectral digital watermark image according to claim 1 or 3, wherein one of the carbon black inking concentrations of one of the neutral gray balances in the infrared digital image is out of the range of 10% to 20 %, and one of the two-dimensional barcodes has an output range of 6% to 12%. A method for designing a multi-spectral digital watermark image according to claim 1 of the patent application, the method comprising: using an image drawing software to plan a message region of the watermark image; generating a plurality of concentration matches a guide table, outputting a plurality of the two-dimensional barcodes having different threshold value matrix dots, and then comparing the ink-injected image output values of the infrared digital image or the ultraviolet digital image to obtain the watermark image The concentration matching output table required for design; selecting the ink concentration output range is based on the concentration matching guides, and filtering out the ink concentration output range of the neutral gray balance of the infrared digital image; The microstructure of a digital watermark image is a micro-structure of the digital watermark image generated by the error diffusion method and the dot matrix color method in the digital halftone network technology; and the watermark image is created The dot structure of each zone is based on the concentration matching guide to filter out the ink concentration output range of each zone in the watermark image, and output the watermark map. Like on a physical file. The design method of claim 5, wherein the two-dimensional barcode has an ink concentration output range of 15% to 35%. A method for verifying a digital watermark image using multiple spectra as described in claim 1 of the patent application, the method comprising: a two-dimensional barcode verification step, using the verification tool of the two-dimensional barcode to view the watermark image Whether it can accurately cover the digital information hidden by the two-dimensional barcode; the optical verification step, the watermark image is detected by an optical instrument, and the image inspection is performed by the naked eye; and the copy verification step is performed The watermark image is directly copied, and then whether the infrared digital image copied by the copy affects the verification result of the two-dimensional barcode copied.