Super-capacity invisible two-dimensional code based on true color multi-color halftone dot array

Abstract

The application discloses a kind of super capacity invisible two-dimensional code technology based on true color multicolor halftone dot array.The technology takes two-dimensional code information capacity and its anti-fake application as target, based on printed true color CMYK corresponding quaternary encoding rule, through self-defined color coding technology, original information is modulated to generate multicolor halftone dot array two-dimensional code.The code takes single printing dot as encoding unit, collects its microscopic image to obtain the dot array distribution data of single dot, and decoding can be realized.Compared with prior art, the super capacity invisible two-dimensional code of the application has large encoding density, high identification reliability, and has the functional advantages of super capacity, invisible anti-fake, and has very high actual market value in e-commerce, printing and packaging, product traceability and other fields.

Description

Technical Field

[0001] This invention relates to QR codes and printing anti-counterfeiting technology, specifically a high-capacity invisible QR code based on true primary color multicolor halftone dot matrix. Background Technology

[0002] QR codes, with their high storage capacity and ease of reading, are widely used in various fields. However, in the era of big data and rampant counterfeiting, they still struggle to meet ever-changing practical needs. On the one hand, small products like semiconductor chips cannot provide enough space to accommodate QR codes, while excessively large QR codes can negatively impact the overall product experience. On the other hand, QR codes are easily counterfeited, making information capacity and anti-counterfeiting measures urgent issues to address. Color QR codes, as an important future development direction, offer additional functionality through color, but the increased color dimension leads to problems such as color aliasing and distortion, posing significant challenges to decoding. With the rapid development of image acquisition technology in smart devices, cameras can easily capture detailed images, and the concept of color QR codes has gradually become widespread. Therefore, a new type of color QR code technology needs to be developed that can achieve reliable decoding while increasing encoding density, and also possess anti-counterfeiting capabilities while adhering to green and environmentally friendly principles.

[0003] CN109948766A discloses a multi-code composite color anti-counterfeiting QR code and its generation and reading method. This code combines multiple QR codes into one using multiplexing technology. The generated multi-code composite color QR code can effectively distinguish between clear and hidden codes under visible light and optical filters. The hidden code enhances its anti-counterfeiting performance to some extent and also increases its capacity; however, it requires optical filters to obtain the hidden code, and the capacity can only be increased by a maximum of 2 to 3 times.

[0004] CN111539503A discloses a method, apparatus, and anti-counterfeiting system for generating a color anti-counterfeiting QR code. This code can be obtained by fusing a color image and a black-and-white QR code through a synthesis method, or by generating it using a substitution method based on color block mapping. Although it adds a color image to the QR code, the color only provides an aesthetically pleasing anti-counterfeiting label and does not solve the technical bottleneck of QR code capacity. Summary of the Invention

[0005] The purpose of this invention is to provide an ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix, which solves the problems of limited information capacity and low security of existing QR codes. It has the functions of reliable decoding, ultra-large capacity and invisible anti-counterfeiting, and also has the application advantages of being green, environmentally friendly and low cost.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows:

[0007] A novel type of color QR code based on a true primary color multi-color halftone dot matrix is ​​described. This code offers multiple advantages, including reliable decoding, large information storage capacity, and invisibility for anti-counterfeiting. It employs a quaternary encoding rule corresponding to the true primary colors of the printed code to determine the encoding method of the original information. A custom color encoding technique is then used to encode the information, generating a multi-color halftone dot matrix QR code.

[0008] Furthermore, the true primary color of printing is a "basic color" that cannot be obtained by mixing other colors, namely ordinary four-color printing ink CMYK.

[0009] Furthermore, the quaternary encoding rule utilizes CMYK four-color printing, where one color block can record 4 bits of information, representing one quaternary number, and the corresponding encoding rule is the quaternary encoding rule.

[0010] The present invention proposes a high-capacity invisible QR code based on true primary color multicolor halftone dot matrix. The customized color encoding technology follows the encoding rules of QR codes, grouping the original information into four-bit groups for storage in corresponding data units. The encoding process includes the following steps:

[0011] Includes the following steps:

[0012] (1) Analysis of raw information;

[0013] (2) Data encoding;

[0014] (3) Error correction coding;

[0015] (4) Placement of the dot matrix module;

[0016] (5) Mask calculation;

[0017] (6) Ultra-large capacity invisible QR code.

[0018] The present invention proposes a high-capacity invisible QR code based on a true primary color multi-color halftone dot matrix. This high-capacity invisible QR code uses a single printed dot as the encoding unit, and its decoding process includes the following steps:

[0019] (1) Image preprocessing;

[0020] (2) Acquisition of microscopic images;

[0021] (3) Module color recognition;

[0022] (4) Parsing of raw information.

[0023] Furthermore, the generation method includes the following steps:

[0024] (1) Image preprocessing

[0025] Image preprocessing of printed ultra-large capacity invisible QR codes mainly includes operations such as image grayscale conversion, grayscale image binarization, image positioning, and image correction to obtain a more standardized QR code image.

[0026] (2) Acquisition of microscopic images

[0027] The module location is determined from the halftone image in step (1), and its microscopic image is acquired using the image acquisition technology of the smart device.

[0028] (3) Module color recognition

[0029] Based on the microscopic images acquired in step (2), the colors of the QR code modules are identified.

[0030] (4) Parsing of raw information

[0031] The original information was obtained by decoding according to the encoding rules of the ultra-large capacity invisible QR code.

[0032] Furthermore, the ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix is ​​an ultra-large capacity color QR code, in which one data unit module represents one quaternary number, and each module has 16 possibilities, thereby achieving the purpose of increasing information storage capacity.

[0033] Furthermore, the ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix is ​​a dot matrix invisible QR code, which records information through individual C, M, Y, K color dots. The size of the color dots is lower than the resolution of the human eye, thereby achieving the effect of anti-counterfeiting and invisibility.

[0034] Furthermore, the ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix is ​​not limited to printing true primary color CMYK, but is also applicable to multicolor printing such as five-color or six-color printing, corresponding to quinary or hexadecimal encoding rules respectively, and the information storage capacity increases accordingly.

[0035] The beneficial effects of this invention are as follows:

[0036] This invention is a high-capacity invisible QR code based on true primary color multi-color halftone dot matrix. The code is based on the quaternary encoding rules corresponding to the true primary colors CMYK in printing. It encodes the original information using a custom color encoding technology to generate a multi-color halftone dot matrix QR code. The code uses individual printed dots as encoding units; decoding is achieved by acquiring the dot matrix distribution data of a single dot through microscopic image acquisition. Through simple printing using ordinary production processes and CMYK ink, it solves the problems of limited information capacity and low security of existing QR codes. It combines reliable decoding, high capacity, and invisible anti-counterfeiting features, while also offering advantages such as being environmentally friendly and low-cost. This invention brings beneficial effects to the development and improvement of QR code technology in e-commerce, printing and packaging, product traceability, and other fields. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] Appendix Figure 1 This is a flowchart of the ultra-large capacity invisible QR code encoding based on true primary color multicolor halftone dot matrix of the present invention.

[0039] Appendix Figure 2 This is a flowchart of the ultra-large capacity invisible QR code decoding based on true primary color multicolor halftone dot matrix of the present invention. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited to the following embodiments.

[0041] Example 1

[0042] The ultra-large capacity invisible QR code based on true primary color multi-color halftone dot matrix is ​​a new type of color QR code with multiple features such as reliable decoding, ultra-large information storage capacity, and invisible anti-counterfeiting. It adopts a quaternary encoding rule corresponding to the true primary colors of printing, and encodes the original information through a custom color encoding technology to generate a multi-color halftone dot matrix QR code.

[0043] The true primary colors for printing are the "basic colors" that cannot be obtained by mixing other colors, namely the ordinary four-color printing ink CMYK.

[0044] The quaternary encoding rule uses CMYK four-color printing. One color block can record 4 bits of information, representing one quaternary number. The corresponding encoding rule is the quaternary encoding rule.

[0045] Example 2

[0046] Encoding steps for ultra-large capacity invisible QR codes based on true primary color multicolor halftone dot matrix.

[0047] This step is used to encode the ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix in Example 1. The encoding process is as follows: Figure 1 The custom color encoding technology follows the QR code encoding rules, grouping the original information into four-bit blocks for storage in corresponding data units. The encoding process includes the following steps:

[0048] (1) Analysis of raw information;

[0049] (2) Data encoding;

[0050] (3) Error correction coding;

[0051] (4) Placement of the dot matrix module;

[0052] (5) Mask calculation;

[0053] (6) Ultra-large capacity invisible QR code.

[0054] Example 3

[0055] Decoding steps for ultra-large capacity invisible QR codes based on true primary color multicolor halftone dot matrix.

[0056] This step is used to decode ultra-large capacity invisible QR codes based on true primary color multicolor halftone dot matrix. The decoding process is as follows: Figure 2 Using a single printed halftone dot as the encoding unit, the decoding process includes the following steps:

[0057] (1) Image preprocessing

[0058] Image preprocessing of printed ultra-large capacity invisible QR codes mainly includes operations such as image grayscale conversion, grayscale image binarization, image positioning, and image correction to obtain a more standardized QR code image.

[0059] (2) Acquisition of microscopic images

[0060] The module position is determined from the QR code image in step (1), and its microscopic image is acquired using the image acquisition technology of smart devices.

[0061] (3) Module color recognition

[0062] Based on the microscopic images acquired in step (2), the colors of the modules are identified respectively.

[0063] (4) Parsing of raw information

[0064] The original information was obtained by decoding according to the encoding rules of the ultra-large capacity invisible QR code.

[0065] Example 4

[0066] The ultra-high capacity invisible QR code based on true primary color multicolor halftone dot matrix is ​​an ultra-high capacity color QR code. Each data unit module represents a single quaternary digit, meaning each module has 16 possibilities. Therefore, the information capacity of n modules is 16... k =(2 k ) 4 This achieves the goal of increasing information storage capacity. Simultaneously, it is a dot-matrix invisible QR code, recording information through individual C, M, Y, and K color dots in a single printed halftone pattern. The size of these dots is lower than the resolution of the human eye, thus achieving an anti-counterfeiting and invisible effect. It is not limited to printing true CMYK primary colors; it is also suitable for five-color or six-color printing, corresponding to quinary or hexadecimal encoding rules, thereby increasing information storage capacity.

[0067] The specific embodiments of the present invention have been described in detail above, but the content is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A super capacity steganographic two-dimensional code based on true color multi-color halftone dot matrix, characterized in that: The ultra-large capacity invisible QR code based on true primary color multi-color halftone dot matrix is ​​a color QR code with multiple functions including reliable decoding, ultra-large information capacity, and invisible anti-counterfeiting. It adopts a quaternary encoding rule corresponding to the true primary colors of printing, and encodes the original information through a custom color encoding technology to generate a multi-color halftone dot matrix QR code. The quaternary encoding rule uses CMYK four-color printing, with each color block recording 4 bits of information, and the corresponding encoding rule is the quaternary encoding rule. In this case, a single printed dot is used as the encoding unit, and the size of the color dot is lower than the resolution of the human eye.

2. The super capacity steganographic two-dimensional code based on the true color multi-color halftone dot array according to claim 1, characterized in that: The true primary colors used in printing are "basic colors" that cannot be obtained by mixing other colors.

3. The super capacity steganographic two-dimensional code based on the true color multi-color halftone dot array according to claim 1, characterized in that: The custom color encoding technology follows the encoding rules of QR codes, and its encoding process includes the following steps: (1) Analysis of raw information; (2) Data encoding; (3) Error correction coding; (4) Placement of the dot matrix modules; (5) Mask calculation; (6) Ultra-large capacity invisible QR code.

4. The super capacity steganographic two-dimensional code based on the true color multi-color halftone dot array according to claim 1, characterized in that: The decoding process of the ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix includes the following steps: (1) Image preprocessing; (2) Acquisition of microscopic images; (3) Module color recognition; (4) Analysis of raw information.

5. The super capacity steganographic two-dimensional code based on the true color multi-color halftone dot matrix of claim 4, wherein: The decoding process includes the following steps: (1) Image preprocessing First, the printed ultra-large capacity invisible QR code is preprocessed to obtain a more standardized QR code image. (2) Acquisition of microscopic images The module position is determined from the halftone image in step (1), and its microscopic image is acquired using the image acquisition technology of the smart device; (3) Module color recognition Based on the microscopic images acquired in step (2), the colors of the QR code modules are identified respectively; (4) Analysis of raw information The original information was obtained by decoding according to the encoding rules of the ultra-large capacity invisible QR code.

6. The super capacity steganographic two-dimensional code based on the true color multi-color halftone dot matrix of claim 5, wherein, The ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix is ​​an ultra-large capacity color QR code, in which one data unit module represents one quaternary number, and each module has 16 possibilities.

7. The super capacity steganographic two-dimensional code based on the true color multi-color halftone dot array according to claim 5, characterized in that, The ultra-large capacity invisible QR code based on true primary color multicolor halftone dot matrix is ​​a dot matrix invisible QR code that records information through individual color dots, the size of which is lower than the resolution of the human eye.

8. The super capacity invisible two-dimensional code based on the true color multi-color halftone dot matrix according to any one of claims 1-7, characterized in that: The ultra-large capacity invisible QR code is not limited to printing true primary color CMYK, but is also applicable to five-color printing, six-color printing, or multi-color printing, corresponding to quinary or hexadecimal encoding rules respectively.

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