CN102945461B - Based on the scale-of-two antiforging printing method of three-dimensional encryption anti-fake information - Google Patents

Abstract

A binary anti-counterfeiting printing method based on three-dimensional encrypted anti-counterfeiting information. This method can generate binary modulation signals through N _i @ ¹ _k C @ ² _k C @ ³ _k C encryption operations and channel coding of binary anti-counterfeiting information. The anti-counterfeiting information is embedded in the whole page with the orderly change of the shape of the amplitude modulation dots in the method of method modulation, which can identify the anti-counterfeiting information from any fragment when identifying the printed matter, and can be widely used in the field of anti-counterfeiting printed matter.

Description

Binary anti-counterfeiting printing method based on three-dimensional encrypted anti-counterfeiting information

Technical field:

The invention relates to an anti-counterfeiting printing technology, in particular to a binary anti-counterfeiting printing technology based on three-dimensional encrypted anti-counterfeiting information, which can be used for anti-counterfeiting of various printed products.

Background technique:

The existing relatively common anti-counterfeiting methods are as follows: The first is laser anti-counterfeiting marks, which use laser recessive ink fluorescent ink printing technology to print product logos or special identification patterns into product anti-counterfeiting labels. And the same type of product uses the same label, because the anti-counterfeiting label is easier to forge, and the fake anti-counterfeiting label is used on the counterfeit product, causing the product to be confused, so it is difficult to effectively prevent counterfeiting. The second is the password anti-counterfeiting label. The method adopted is to compile a set of numbers for each product, and the codes of each product are different. The numbers are printed on the labels and covered, and the numbers are stored Into the computer database that can be inquired by consumers. When consumers purchase products, they input the numbers on the logo into the computer database through telephone or networked computer for comparison and identification. The same is true, and the difference is false. The method is simple and easy to identify. It is not easy to forge, but in actual use, because the encoded data is uniformly generated by the computer, the label is printed. The code data representing the authenticity of the product may be illegally copied and falsified. At the same time, the code can also be recycled from the code on the product that has not been inquired to make a label and affixed to the fake product. The anti-counterfeiting effect is difficult to guarantee. The third is texture anti-counterfeiting, which uses the texture features on the label to prevent counterfeiting. Although it is difficult to forge, since only the serial number of the label is set, and it is a clear code, each label can be queried repeatedly, and counterfeiters can store it in the warehouse. The clerk or salesperson plagiarizes the serial number on the label and the necessary texture characteristics reflected in the query, that is, the presence or absence of phenomena in the grid, and then forges them in batches according to this characteristic. In summary, the existing anti-counterfeiting methods have certain shortcomings, and thus cannot fundamentally prevent counterfeit products.

Invention content:

In order to overcome the shortcomings of the existing anti-counterfeiting printing technology for various printed products, the present invention improves the existing technology in view of the shortcomings of the existing anti-counterfeiting printing technology for printed products, and proposes a binary encryption signal to modulate the shape of the AM dots of printed products Encrypted anti-counterfeiting printing technology, this anti-counterfeiting printing technology embeds anti-counterfeiting information in the entire page by changing the shape of AM dots, and can identify anti-counterfeiting information from any fragment when identifying printed matter, so it is highly resistant to shattering and can be read from Fundamentally put an end to the use of photography, scanning and other illegal copying.

The technical solution adopted by the present invention to solve the technical problem is: separately process the amplitude modulation dots and frequency modulation dots in the flexographic printing hybrid screening, and use the image information and text information anti-counterfeiting information to generate an 8-bit binary anti-counterfeiting information table, In order to prevent information overflow during the encryption process, the 8-bit binary information in the binary anti-counterfeiting information table is expanded into a 16-bit binary information, and a 16-bit binary anti-counterfeiting information table with all 0s in the upper 8 bits is generated. The i-th group of 16-bit binary information in the bit-group binary anti-counterfeiting information table is denoted as N _i , i is a positive integer greater than 0, and the eight-bit binary encryption parameter is denoted as C, and the encryption parameter C is an integer of 0≦C<256, The binary operator control variable is denoted as k, the operator control variable k is an integer of 0≦k≦3, the operator Using +, -, ×, ÷ four, Using ×, -, +, ÷ four, Four types of ÷, -, ×, + are used, and when the operator control variable k=0 Defined as "+" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "×" operation, when the operator control variable k=3 Defined as "÷" operation, when the operator control variable k=0 Defined as "×" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "+" operation, when the operator control variable k=3 Defined as "÷" operation, when the operator control variable k=0 Defined as "÷" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "×" operation, when the operator control variable k=3 Defined as "+" operation, the initial value of the encryption parameter C is set, the initial value k=0 of the operator control variable _k is set, and the position control of the 16-bit binary information Ni in the 16-bit group binary anti-counterfeiting information table is set Variable i=1, starting from the first group of 16 binary information N ₁ in the 16-bit binary anti-counterfeiting information table, each group of 16 binary information in the 16-bit binary anti-counterfeiting information table is carried out Encryption operation, and each set of 16-bit binary information Perform i+1 and k+1 operations at the same time as the encryption operation, so that the next operation points to Among them, both i and k have increased by 1, and each set of 16-bit binary information in the 16-bit set of binary anti-counterfeiting information table is carried out Encryption operation, generate a 16-bit binary encrypted anti-counterfeiting information table, the shape of the AM dots is set to two types: □ and ◇, where □ is defined as the number 0, ◇ is defined as the number 1, using the generated 16-bit binary The encrypted anti-counterfeiting information modulates the AM dots through the circular look-up method, so that the shape of the AM dots in the mixed screen can be changed regularly according to the shapes of the above two AM dots, so that the shape of the AM dots in the mixed screen can be changed regularly. After modulation, 16 adjacent AM outlets form a set of 16-bit binary information, which makes it carry anti-counterfeiting information and embeds the anti-counterfeiting information in the entire page outlets, which can more effectively combat illegal copying based on cameras, scanners, and electronic documents. Behavior. By non-obviously embedding extractable anti-counterfeiting information in the printed matter, effective proof can be provided for the genuine product, and at the same time, it has strong anti-counterfeiting ability without adding additional anti-counterfeiting costs.

In order to solve the above-mentioned technical problems, at first the anti-counterfeiting information is digitized to generate an 8-bit binary anti-counterfeiting information table. The anti-counterfeiting information can be image information and text information, and the 8-bit binary information in the binary anti-counterfeiting information table is expanded into A 16-bit group of binary information, generate a 16-bit group of binary anti-counterfeiting information table with all 0s in the upper 8 bits, and carry out each group of 16-bit binary information in the 16-bit group of binary anti-counterfeiting information table Encryption operation, generate a 16-bit binary encrypted anti-counterfeiting information table, use the 16-bit binary information in the generated 16-bit binary encrypted anti-counterfeiting information table to undergo channel coding, and generate a 16-bit group with error detection and error correction functions binary modulated signal. Channel coding can adopt various forms such as cyclic coding, convolutional coding or Turbo coding, and the original continuous tone image signal is rasterized and mixed to output a halftone mixed screened image signal, including AM and FM dot images Signal, use the generated 16-bit binary modulation signal to modulate the shape of the AM dots in the halftone mixed screen image signal, so that the shape of the AM dots changes regularly according to □ and ◇, so that the halftone The 16 adjacent amplitude modulation dots in the tone mixed screen image signal carry 16-bit binary anti-counterfeiting information through the change of shape, thereby generating a halftone mixed screen image signal with anti-counterfeit information embedded in the entire page dots, realizing anti-counterfeiting printing.

When extracting anti-counterfeiting information, first collect the dot image signal, and then extract the edge signal of the dot after fuzzy identification of the shape of the AM dot to distinguish the shape of the AM dot. Demodulate the shape information of AM dots, and output a 16-bit binary modulation signal. Channel decoding and decryption are respectively performed on the 16-bit binary modulation signals output by demodulation, the anti-counterfeiting signals are recovered and anti-counterfeiting information is output.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a flow chart of loading anti-counterfeiting information.

Figure 2 is a flow chart of extracting anti-counterfeiting information.

detailed description

In flow chart 1 of loading anti-counterfeiting information, the original anti-counterfeiting information (image, text) is digitized to generate an 8-bit binary anti-counterfeiting information table, and the 8-bit binary information in the binary anti-counterfeiting information table is expanded to 16-bit one Group binary information, generate a 16-bit binary anti-counterfeiting information table whose upper 8 bits are all 0, the i-th group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table is recorded as N _i , i is a positive integer greater than 0 , the eight-bit binary encryption parameter is denoted as C, the encryption parameter C is an integer of 0≦C﹤256, the binary operator control variable is denoted as k, the operator control variable k is an integer of 0≦k≦3, and the operator Using +, -, ×, ÷ four, Using ×, -, +, ÷ four, Four types of ÷, -, ×, + are used, and when the operator control variable k=0 Defined as "+" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "×" operation, when the operator control variable k=3 Defined as "÷" operation, when the operator control variable k=0 Defined as "×" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "+" operation, when the operator control variable k=3 Defined as "÷" operation, when the operator control variable k=0 Defined as "÷" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "×" operation, when the operator control variable k=3 Defined as "+" operation, the initial value of the encryption parameter C is set, the initial value k=0 of the operator control variable _k is set, and the position control of the 16-bit binary information Ni in the 16-bit group binary anti-counterfeiting information table is set Variable i=1, starting from the first group of 16 binary information N ₁ in the 16-bit binary anti-counterfeiting information table, each group of 16 binary information in the 16-bit binary anti-counterfeiting information table is carried out Encryption operations, and each set of 16-bit binary information Perform i+1 and k+1 operations at the same time as the encryption operation, so that the next operation points to Among them, both i and k have increased by 1, and each group of 16-bit binary information in the 16-bit group of binary anti-counterfeiting information table is carried out Encryption operation to generate a 16-bit binary encrypted anti-counterfeiting information table. The shape of the AM dots is set to two types: □ and ◇, where □ is defined as the number 0 and ◇ is defined as the number 1. The generated 16-bit binary encrypted anti-counterfeiting information is passed through Channel coding to generate a binary modulated signal with error detection and correction. Channel coding can adopt various forms such as cyclic coding, convolutional coding or Turbo coding. The original continuous tone image signal is rasterized and mixed and screened to output a halftone mixed screen image signal, including amplitude modulation dot and frequency modulation dot image signals. Utilize the generated binary modulation signal and use the circular look-up modulation method to modulate the shape of the AM dots in the halftone mixed screen image signal, so that the shape of the AM dots in the mixed screen can be changed regularly, and the halftone mixed screen embedded with anti-counterfeiting information can be generated. The network image signal, through the circular look-up table modulation method, makes the adjacent 16-bit AM network dots generate a set of 16-bit binary data through shape changes, so that it carries anti-counterfeiting information, and embeds the anti-counterfeiting information in the entire page dots to achieve anti-counterfeiting print.

In the flow chart 2 of extracting anti-counterfeiting information, first collect the network dot image signal, and through the fuzzy recognition of the spatial position of the network dot, distinguish the frequency modulation network dot and the AM dot, and extract the edge signal and shape information of the AM dot. Demodulate the shape information of AM dots and output binary modulation signals. Perform channel decoding and decryption on the binary modulation signal output by demodulation, recover the anti-counterfeiting signal and output the anti-counterfeiting information.

Claims (1)

1. A binary anti-counterfeiting printing method based on three-dimensional encrypted anti-counterfeiting information that generates a binary modulation signal through encryption operations and channel coding, and embeds the anti-counterfeiting information in the entire page through a cyclic look-up table modulation method, and is characterized in that: The anti-counterfeiting information is digitized to generate an 8-bit binary anti-counterfeiting information table. The anti-counterfeiting information is image information and text information. In order to prevent information overflow during the encryption process, the 8-bit binary information in the binary anti-counterfeiting information table is expanded to 16 A set of binary information, generate a 16-bit binary anti-counterfeiting information table with all 0s in the upper 8 bits, record the i-th group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table as N _i , where i is greater than 0 The positive integer of the eight-bit binary encryption parameter is denoted as C, the encryption parameter C is an integer of 0≦C﹤256, the binary operator control variable is denoted as k, the operator control variable k is an integer of 0≦k≦3, and the operator Using +, -, ×, ÷ four, Using ×, -, +, ÷ four, Four types of ÷, -, ×, + are used, and when the operator control variable k=0 Defined as "+" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "×" operation, when the operator control variable k=3 Defined as "÷" operation, when the operator control variable k=0 Defined as "×" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "+" operation, when the operator control variable k=3 Defined as "÷" operation, when the operator control variable k=0 Defined as "÷" operation, when the operator control variable k=1 Defined as "-" operation, when the operator control variable k=2 Defined as "×" operation, when the operator control variable k=3 Defined as "+" operation, the initial value of the encryption parameter C is set, the initial value k=0 of the operator control variable _k is set, and the position control of the 16-bit binary information Ni in the 16-bit group binary anti-counterfeiting information table is set Variable i=1, starting from the first group of 16 binary information N ₁ in the 16-bit binary anti-counterfeiting information table, each group of 16 binary information in the 16-bit binary anti-counterfeiting information table is carried out Encryption operation, and each set of 16-bit binary information Perform i+1 and k+1 operations at the same time as the encryption operation, so that the next operation points to Among them, both i and k have increased by 1, and each set of 16-bit binary information in the 16-bit set of binary anti-counterfeiting information table is carried out Encryption operation to generate a 16-bit binary encrypted anti-counterfeiting information table, the shape of the AM dots is set to two types: and in Defined as the number 0, Defined as the number 1, use the generated 16-bit binary encrypted anti-counterfeiting information to undergo channel coding to generate a 16-bit binary modulation signal with error detection and error correction functions, and rasterize the original continuous tone image signal and Hybrid screen output halftone mixed screen image signal, including amplitude modulation dot and frequency modulation dot image signal, use the generated 16-bit binary modulation signal to modulate the amplitude modulation dot in the halftone mixed screen image signal by means of circular look-up table modulation shape, so that the shape of the AM dot follows the and Changes occur regularly, so that the adjacent 16 AM dots in the halftone mixed screen image signal carry 16-bit binary encrypted anti-counterfeiting information through shape changes, thereby generating a halftone mixed screen image with anti-counterfeiting information embedded in the entire page dots Signal, to achieve anti-counterfeiting printing.