阅读说明：本技术 数字打印自定义潜影图文水印信息的复制可显影方法 (Copying and developing method for digital printing user-defined latent image and text watermark information ) 是由 曹鹏 李�杰 于 2021-07-28 设计创作，主要内容包括：本发明属于印刷防伪领域,尤其涉及数字打印自定义潜影图文水印信息的复制可显影方法。本发明包括以下步骤：用户水印图文信息定义、潜影水印图像生成、图文信息调制、隐藏潜影水印图文信息的打印文件生成、打印设备参数最佳匹配。本发明是一种可将自主定义的不可变或可变图文信息以视觉不可见方式,植入到打印文档中,随打印文档一并打印在打印稿上,扫描复制该打印稿时,隐藏在其中的不可见图文水印便显影出来,该显影出的水印信息用于打印稿图文信息防伪及其复印件的标识与溯源。(The invention belongs to the field of printing anti-counterfeiting, and particularly relates to a copying and developing method for digitally printing user-defined latent image and text watermark information. The invention comprises the following steps: defining watermark image and text information of a user, generating a latent image watermark image, modulating image and text information, generating a printing file of hidden latent image watermark image and text information, and optimally matching parameters of printing equipment. The invention relates to a method for embedding self-defined unchangeable or changeable graphic and text information into a printed document in a visual invisibility mode, printing the information on the printed document along with the printed document, developing the watermark of the invisible document hidden in the printed document when scanning and copying the printed document, wherein the developed watermark information is used for printing the anti-counterfeiting of the graphic and text information of the document and the identification and tracing of a copy of the information.)

1. A method for copying and developing watermark information of digitally printed self-defined latent image and text, which is characterized in that the method for copying and developing is characterized in that the self-defined unchangeable or changeable text information is implanted into a document in a visual invisible mode, the text information is printed on a printing stock together with the document, and the invisible text information hidden in the document is developed when the document is scanned or copied, and the method for copying and developing comprises the following steps:

(1) defining watermark image-text information of a user;

(2) generating a latent image watermark image;

(3) modulating image-text information;

(4) generating a printing file for hiding latent image watermark image-text information;

(5) the printing device parameters are best matched.

2. The method for copying and developing the watermark information of the digitally printed custom latent image and text according to claim 1, wherein the image and text information is hidden in the AM/FM mixed modulated shading and embedded in the document in a way that the image and text information is invisible.

3. The method for copying and developing the watermark information of the digitally printed custom latent image and text according to claim 1, wherein the method for realizing the method comprises the following steps:

(1) user watermark graphic and text information definition

According to the anti-counterfeiting requirement, a user provides corresponding image-text information to be hidden, and the image-text information can be required to be arranged in a certain mode;

(2) latent image watermark image generation

Generating an image which is equal to the breadth of the printed document according to the required arrangement requirement of the provided image-text information according to the breadth requirement and the anti-counterfeiting requirement of the printed document, and then carrying out gray scale modulation by using a carrier image G1 to obtain a latent image watermark image G2 with the same gray scale as the carrier image;

(3) modulation of teletext information

An AM threshold matrix CM1 and an FM threshold matrix CM2 are designed according to a digital screening principle, a matrix CM1 is used for carrying out amplitude modulation screening on a carrier image G1 to obtain an image GAM, then the matrix CM2 is used for carrying out frequency modulation screening on a latent image watermark image G2 to obtain an image GFM, and the image GAM and the image GFM are synthesized into a shading image GM by using a 2PSK modulation method;

(4) print file generation for hidden latent image watermark image-text information

Implanting the shading image GM serving as a background color into a document to be printed to generate a printed file of hidden latent image watermark image-text information to be printed;

(5) optimal matching of printing device parameters

And according to the generation mode of the shading image GM, selecting the printing resolution matched with the printer, the optimal overprinting color control, the screen angle and other parameter settings to achieve the optimal printing effect.

4. The method for copying and developing watermark information of digitally printed custom latent image and text according to claim 1 or 3, characterized in that the image GAM and the image GFM are synthesized into a shading image GM by using a 2PSK modulation method, and the image GM is formed by fusing the GAM and the GFM without obvious visual difference.

5. The method for copying and developing the watermark information of the digitally printed custom latent image and text according to claim 1 or 4, characterized in that the quantization errors of the frequency modulation net and the amplitude modulation net are reduced by adjusting the number and the positions of the frequency modulation net points until the effect that the embedded latent image and the watermark are not visible is achieved.

6. The method for copying and developing watermark information of digitally printed custom latent image and text according to claim 1, characterized in that the anti-counterfeiting features are: the printed document is implanted with the invisible latent image watermark, and after the latent image watermark is printed on a printing stock, obvious and full warning information appears through scanning or copying, so that the anti-counterfeiting requirement is met.

Technical Field

The invention belongs to the field of printing anti-counterfeiting, and particularly relates to a copying and developing method for digitally printing user-defined latent image and text watermark information.

Background

With the popularization of printers, the number of printed documents is increased, the research on the anti-copy technology of the documents is an important problem, and a copy developing method for digitally printing user-defined latent image-text watermark information is invented aiming at the safety problem and the practical application requirement of the documents in the aspect of anti-counterfeiting.

The invention aims to solve the problem of copy prevention of a document, and aims to increase the anti-counterfeiting capability of the document on the basis of different identification capabilities of a copying machine on different network lines and different network points and through FM/AM mixed modulation and screening a large amount of embedded latent image watermark information, so that the document has the basic function of normally displaying information.

Based on the principle, the invention makes a document which is copied or scanned and displays the warning information, namely, a large number of invisible latent image watermarks are implanted into the printed document, once the original document is scanned or copied, the obvious warning information is displayed, and the original document and the copied document are obviously distinguished. Can meet various scenes and anti-counterfeiting requirements.

Disclosure of Invention

The invention aims to realize the copy prevention of a document, and provides a method for copying and developing digital printing user-defined latent image-text watermark information based on FM/AM mixed screening.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a copying and developing method for digitally printing customized latent image-text watermark information, wherein the copying and developing method implants customized unchangeable or changeable image-text information into a document in a visual invisible mode, the customized unchangeable or changeable image-text information is printed on a printing stock along with the document, and the invisible image-text information hidden in the document is developed when the document is scanned or copied, the copying and developing method comprises the following steps:

(1) defining watermark image-text information of a user;

(2) generating a latent image watermark image;

(3) modulating image-text information;

(4) generating a printing file for hiding latent image watermark image-text information;

(5) the printing device parameters are best matched.

Further, the image-text information is hidden in the AM/FM mixed modulation shading and embedded into the document in a mode that the image-text information is invisible.

Further, the method for realizing the copy developing method comprises the following steps:

(1) user watermark graphic and text information definition

According to the anti-counterfeiting requirement, a user provides corresponding image-text information to be hidden, and the image-text information can be required to be arranged in a certain way to determine the implanted content and the arrangement way;

(2) latent image watermark image generation

Generating an image which is equal to the breadth of the printed document according to the required arrangement requirement of the provided image-text information according to the breadth requirement and the anti-counterfeiting requirement of the printed document, and then carrying out gray scale modulation by using a carrier image G1 to obtain a latent image watermark image G2 with the same gray scale as the carrier image;

(3) modulation of teletext information

An AM threshold matrix CM1 and an FM threshold matrix CM2 are designed according to a digital screening principle, a matrix CM1 is used for carrying out amplitude modulation screening on a carrier image G1 to obtain an image GAM, then the matrix CM2 is used for carrying out frequency modulation screening on a latent image watermark image G2 to obtain an image GFM, and the image GAM and the image GFM are synthesized into a shading image GM by using a 2PSK modulation method;

(4) print file generation for hidden latent image watermark image-text information

Implanting the shading image GM serving as a background color into a document to be printed to generate a printed file of hidden latent image watermark image-text information to be printed;

(5) optimal matching of printing device parameters

And according to the generation mode of the shading image GM, selecting the printing resolution matched with the printer, the optimal overprinting color control, the screen angle and other parameter settings to achieve the optimal printing effect.

Further, the image GAM and the image GFM are synthesized into a shading image GM by using a 2PSK modulation method, and the image GM is formed by fusing the GAM and the GFM and has no obvious visual difference.

Furthermore, the quantization errors of the frequency modulation net and the amplitude modulation net are reduced by adjusting the number and the positions of the frequency modulation net points until the situation that human eyes cannot distinguish is achieved, and the effect that the embedded latent image watermark is invisible visually is achieved.

Further, the anti-counterfeiting characteristic is as follows: the printed document is implanted with the invisible latent image watermark, and after the latent image watermark is printed on a printing stock, obvious and full warning information appears through scanning or copying, so that the anti-counterfeiting requirement is met.

Further, in the step (2), different gray values can be modified according to anti-counterfeiting requirements.

Furthermore, in the step (3), the shape of the amplitude modulation dots and the arrangement of the frequency modulation dots can be improved to further enhance the visual invisibility.

The invention has the following beneficial effects:

the invention is based on FM/AM mixed screening technology, invents a copy developing method of digital printing self-defined latent image-text watermark information, which implants the self-defined unchangeable or changeable image-text information into the document in a visual invisible mode, and prints the image-text information on the printing stock along with the document, and when scanning or copying the document, the invisible image-text information hidden in the document is developed. The technology is suitable for various scenes, greatly increases the implanted watermark information, does not influence the identification of the document content, and brings beneficial effects to the document anti-counterfeiting.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a technical flow diagram of the present invention;

FIG. 2 is an exemplary illustration of an image of a print document before scanning and copying in accordance with the present invention;

FIG. 3 is an exemplary image of a scanned copy of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the invention provides a copy developing method for digitally printing user-defined latent image-text watermark information, which implants the user-defined unchangeable or changeable image-text information into a document in a visual invisible mode, prints the document on a printing stock together with the document, and develops the invisible image-text information hidden in the document when scanning or copying the document, wherein the copy developing method comprises the following steps:

(1) defining watermark image-text information of a user;

(2) generating a latent image watermark image;

(3) modulating image-text information;

(4) generating a printing file for hiding latent image watermark image-text information;

(5) the printing device parameters are best matched.

In one embodiment of the invention, the graphic and text information is hidden in the AM/FM mixed modulation shading and is embedded into the document in a mode of invisible graphic and text information.

In an embodiment of the present invention, a method for implementing a copy developable method includes the following steps:

(1) user watermark graphic and text information definition

According to the anti-counterfeiting requirement, a user provides corresponding image-text information to be hidden, and the image-text information can be required to be arranged in a certain way to determine the implanted content and the arrangement way;

(2) latent image watermark image generation

Generating an image which is equal to the breadth of the printed document according to the required arrangement requirement of the provided image-text information according to the breadth requirement and the anti-counterfeiting requirement of the printed document, and then carrying out gray scale modulation by using a carrier image G1 to obtain a latent image watermark image G2 with the same gray scale as the carrier image;

(3) modulation of teletext information

An AM threshold matrix CM1 and an FM threshold matrix CM2 are designed according to a digital screening principle, a matrix CM1 is used for carrying out amplitude modulation screening on a carrier image G1 to obtain an image GAM, then the matrix CM2 is used for carrying out frequency modulation screening on a latent image watermark image G2 to obtain an image GFM, and the image GAM and the image GFM are synthesized into a shading image GM by using a 2PSK modulation method;

(4) print file generation for hidden latent image watermark image-text information

Implanting the shading image GM serving as a background color into a document to be printed to generate a printed file of hidden latent image watermark image-text information to be printed;

(5) optimal matching of printing device parameters

And according to the generation mode of the shading image GM, selecting the printing resolution matched with the printer, the optimal overprinting color control, the screen angle and other parameter settings to achieve the optimal printing effect.

In one embodiment of the invention, the image GAM and the image GFM are synthesized into the shading image GM by using a 2PSK modulation method, and the image GM is formed by fusing the GAM and the GFM and has no obvious visual difference.

In one embodiment of the invention, the quantization errors of the frequency modulation net and the amplitude modulation net are reduced by adjusting the number and the positions of the frequency modulation net points until the situation that human eyes cannot distinguish the frequency modulation net and the amplitude modulation net, so that the effect that the embedded latent image watermark is invisible visually is achieved.

In one embodiment of the present invention, the anti-counterfeit feature is: the printed document is implanted with the invisible latent image watermark, and after the latent image watermark is printed on a printing stock, obvious and full warning information appears through scanning or copying, so that the anti-counterfeiting requirement is met.

In one embodiment of the present invention, in the step (2), different gray values may be modified according to the anti-counterfeiting requirement.

In one embodiment of the present invention, in step (3), the shape of the amplitude modulation dots and the arrangement of the frequency modulation dots can be improved to further enhance the visual invisibility.

The present invention will be described in further detail with reference to examples, but the present invention is not limited to the following examples.

Example 1 office document printing

Referring to fig. 1, the method includes the steps of:

(1) user watermark graphic and text information definition

According to the anti-counterfeiting requirement, a user provides corresponding image-text information to be hidden, and the image-text information can be required to be arranged in a certain way to determine the implanted content and the arrangement way;

(2) latent image watermark image generation

Generating an image which is equal to the breadth of the printed document according to the required arrangement requirement of the provided image-text information according to the breadth requirement and the anti-counterfeiting requirement of the printed document, and then carrying out gray scale modulation by using a carrier image G1 to obtain a latent image watermark image G2 with the same gray scale as the carrier image;

(3) modulation of teletext information

An AM threshold matrix CM1 and an FM threshold matrix CM2 are designed according to a digital screening principle, a matrix CM1 is used for carrying out amplitude modulation screening on a carrier image G1 to obtain an image GAM, then the matrix CM2 is used for carrying out frequency modulation screening on a latent image watermark image G2 to obtain an image GFM, and the image GAM and the image GFM are synthesized into a shading image GM by using a 2PSK modulation method;

(4) print file generation for hidden latent image watermark image-text information

Implanting the shading image GM serving as a background color into a document to be printed to generate a printed file of hidden latent image watermark image-text information to be printed;

(5) optimal matching of printing device parameters

And according to the generation mode of the shading image GM, selecting the printing resolution matched with the printer, the optimal overprinting color control, the screen angle and other parameter settings to achieve the optimal printing effect.

EXAMPLE 2 antifalsification Label printing

The method is modified according to the required breadth in the step (2), and the anti-counterfeiting label is implanted into the specified position of the document in the step (4), and the rest is the same as the use case 1.