WO2021109536A1

WO2021109536A1 - Item anti-counterfeiting method based on digital watermark matching high-temperature firing process and ceramic anti-counterfeiting application

Info

Publication number: WO2021109536A1
Application number: PCT/CN2020/096571
Authority: WO
Inventors: 付强; 周宇欢
Original assignee: 南京环印防伪科技有限公司
Priority date: 2019-12-03
Filing date: 2020-06-17
Publication date: 2021-06-10
Also published as: CN111127287B; CN111127287A

Abstract

An item anti-counterfeiting method based on a digital watermark matching high-temperature firing process and an ceramic anti-counterfeiting application, capable of embedding different watermark information in each product image without changing the appearance of the product image, and associating richer information for each item of watermark information in a database; in the watermark production, as an image will fuse and blur during high-temperature firing, a strongly robust digital watermark algorithm is selected; however, in order to achieve an anti-counterfeiting effect, the digital watermark algorithm cannot be an absolutely robust algorithm; the watermark strength should be set higher than the watermark strength value suitable for ordinary paper printing, and a watermark strength setting method suitable for a ceramic high-temperature firing process be provided; authenticity detection uses the method of taking a photograph with a mobile telephone and uploading same to a server for watermark extraction, and determining the authenticity of the product on the basis of the watermark information and the integrity thereof, thereby implementing rapid and accurate anti-counterfeiting traceability of high-temperature fired items.

Description

An article anti-counterfeiting method based on digital watermark matching high-temperature firing process and ceramic anti-counterfeiting application

Technical field

The invention relates to an article anti-counterfeiting method and ceramic anti-counterfeiting application based on a digital watermark matching high-temperature firing process, and belongs to the technical field of ceramic anti-counterfeiting.

Background technique

Due to the special manufacturing process of ceramics and other reasons, the anti-counterfeiting of ceramics is very difficult. At present, the commonly used anti-counterfeiting technologies mainly include physical anti-counterfeiting technologies represented by temperature change inks, laser labels, fine lines, clusters, materials, structures, etc., and digital anti-counterfeiting technologies represented by two-dimensional codes. These anti-counterfeiting technologies have been widely used in ordinary goods, but they cannot be applied to the anti-counterfeiting of ceramics, because the printing of ceramic images has passed through the screen printing process and the high-temperature firing process. Technology cannot be applied. Traditional physical anti-counterfeiting technologies either require high printing accuracy, such as pattern anti-counterfeiting, or cannot withstand high-temperature firing, such as ink and material anti-counterfeiting. Digital anti-counterfeiting assigns a unique identification code to each single product package, which can be a number, one-dimensional code, two-dimensional code, RFID, etc. It can support telephone inquiries, mobile phone SMS anti-counterfeiting inquiries, scan code inquiries, website inquiries, etc. However, this kind of code is anti-counterfeit through the number of times the code is checked, so there are many defects, such as: the authenticity cannot be checked before the purchase, and the authenticity cannot be checked multiple times. The anti-counterfeiting ability is closely related to the recall rate, and cannot be destroyed. Invisible, especially invisible, makes this kind of technology seriously affect the artistic appearance of ceramic products.

technical problem

The technical problem to be solved by the present invention is to provide an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process, which can embed the watermark information invisibly on the target article to be fired, so as to realize fast and accurate firing and anti-counterfeiting traceability of the finished product.

Technical solutions

In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention designs an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process, including a watermark information burning method, which is used to set the watermark information on the burning target On the article, the method for burning watermark information includes the following steps:

Step A. Apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target item surface, and then proceed to step B;

Step B. Print the electronic image of the surface of the target item on the paper flower to form the paper flower image, and then proceed to step C;

Step C. Transfer the paper flower image to the target position on the target article and burn it to realize the setting of the watermark information on the target article.

As a preferred technical solution of the present invention, the step A includes the following steps:

Step A1. Determine whether the standard deviation of the color grayscale histogram corresponding to the target watermark setting area in the electronic image of the target item surface is lower than the preset standard deviation threshold, if yes, go to step A2; otherwise, go to step A3;

Step A2. Set the watermark intensity that matches the high-temperature firing process, and apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target item surface, so that the color grayscale histogram standard corresponding to the target watermark setting area Deviation, increase by more than the preset increase after the watermark information is embedded, and complete the setting of embedding the watermark information in the electronic image on the surface of the target item;

Step A3. Divide the target watermark setting area in the electronic image of the target object surface, so that the standard deviation of the color gray histogram corresponding to each block area is lower than the preset standard deviation threshold, and then go to step A4;

Step A4. Set the watermark intensity that matches the high-temperature firing process, and apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target object surface, so that each block area corresponds to the color grayscale histogram The standard deviation and the pre-set increase after the watermark information is embedded are all increased, and the watermark information is embedded in the electronic image of the target item surface.

As a preferred technical solution of the present invention, the step A3 includes the following steps:

Step A3-1. Divide the undivided area in the target watermark setting area of the electronic image on the surface of the target item to obtain a block area whose standard deviation of the corresponding color grayscale histogram is lower than the preset standard deviation threshold, and proceed to step A3 -2;

Step A3-2. Determine whether the area of the accumulated block area exceeds the preset percentage of the area of the target watermark setting area, if yes, stop the area division; otherwise, return to step A3-1.

As a preferred technical solution of the present invention: in the step A3-2, it is judged whether the area of the accumulated block area exceeds 30% of the area of the target watermark setting area.

As a preferred technical solution of the present invention, in the step B, a screen printing method or a digital printing method is adopted to print the electronic image of the surface of the target article on the paper flower to form the paper flower image.

As a preferred technical solution of the present invention, it also includes a target item watermark detection method, including the following steps:

Step I. Use a watermark collection device with image capture function to acquire an image of the surface of the target item, correct the image size, upload it to the server, and then proceed to step II;

Step Ⅱ. The server extracts the watermark information in the obtained image, and judges whether the watermark information meets the integrity requirements, if yes, then extracts the information from it, combines with other information related to the information in the database, and returns to the watermark collection device. ; Otherwise, return to the watermark collection device prompting to re-shoot or judge to be a fake product.

As a preferred technical solution of the present invention, the target object is any one of ceramics, glass, metal, plastic, purple sand, and ceramic tiles.

The technical problem to be solved by the present invention is to provide a ceramic anti-counterfeiting application based on an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process, which can embed watermark information invisibly in ceramics to realize fast and accurate anti-counterfeiting traceability of ceramic products.

In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention designs a ceramic anti-counterfeiting application based on an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process. The target article is ceramic, and the steps A to C are adopted. In the method, the watermark information is set on the ceramic, and steps I to II are adopted to realize the detection of the watermark on the ceramic.

As a preferred technical solution of the present invention: in the process of setting the watermark information on the ceramic by adopting the method from step A to step C, based on the preset standard deviation threshold of 3,

If the target position for transferring the paper flower image on the ceramic is above the glaze layer, and the firing temperature is a preset fluctuation range of 200 degrees Celsius, the preset increase is 4;

If the target position for transferring the paper flower image on the ceramic is above the glaze layer, and the firing temperature is a preset fluctuation range of 800 degrees Celsius, the preset increase is 10;

If the target position for transferring the paper flower image on the ceramic is in the middle of the glaze layer, and the firing temperature is a preset fluctuation range of 1100 degrees Celsius, the preset increase is 11;

If the target position for transferring the paper flower image on the ceramic is below the glaze layer and above the ceramic embryo, and the firing temperature is a preset fluctuation range of 1300 degrees Celsius, the preset increase is 12.

As a preferred technical solution of the present invention: in the step B, in the process of printing the electronic image of the ceramic surface on the paper flower, based on the difference of the target position for transferring the paper flower image on the ceramic, different selections are made. Firing temperature, for the firing temperature with a preset fluctuation range of 200 degrees Celsius, select the sublimation ink to print the electronic image of the ceramic surface on the paper flower; for the firing temperature above 500 degrees Celsius, select the one that meets the firing temperature requirements The corresponding mineral pigment prints the electronic image of the ceramic surface on the paper flower.

Beneficial effect

The article anti-counterfeiting method based on digital watermark matching high-temperature firing process of the present invention adopts the above technical scheme and has the following technical effects compared with the prior art:

The article anti-counterfeiting method and ceramic anti-counterfeiting application based on the digital watermark matching high-temperature firing process designed in the present invention can embed different watermark information in each product image without changing the appearance of the product image, and store it in the database. Each watermark information is associated with richer information, such as: ceramic production information, author information, traceability information, etc. The information can be in the form of text, image, audio, video, etc.; in the production of watermarks, for high-temperature firing, The image will be fused and blurred. Choose a more robust digital watermarking algorithm. At the same time, in order to have an anti-counterfeiting effect, the digital watermarking algorithm cannot be an absolutely robust algorithm; when setting the watermark strength, it is better than the ordinary one. Paper printing has a higher watermark strength value, and gives a watermark strength setting method suitable for the ceramic high-temperature firing process; the authenticity detection is to use a mobile phone to take a picture and upload it to the server for watermark extraction. According to the watermark information Its completeness determines the authenticity of the product, thus realizing fast and accurate anti-counterfeiting traceability of ceramic products.

Description of the drawings

Figure 1 is a schematic diagram of different ceramic firing positions in the design scheme of the present invention;

Figure 2 is a schematic diagram of each layer of the paper flower in the design scheme of the present invention.

Embodiments of the present invention

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings of the specification.

The present invention designs an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process, including a watermark information firing method, which is used to set the watermark information on a fired target article, and the target article is ceramic, glass, metal, etc. Any one of plastic, purple sand, and ceramic tiles, the watermark information burning method includes the following steps A to C.

Step A. According to the following steps A1 to A4, apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target object surface, and then go to step B.

Step A1. Determine whether the standard deviation of the color grayscale histogram corresponding to the target watermark setting area in the electronic image of the target object surface is lower than the preset standard deviation threshold, if yes, go to step A2; otherwise, go to step A3.

The main purpose of the above step A1 is to judge whether the gray level change of the electronic image itself is smooth. If it is smooth, you can go directly to step A2 to calculate the overall histogram standard deviation; if the gray level change of the image itself is relatively large and exceeds a certain threshold, Then go to step 3, divide the electronic image into several relatively flat gray areas, calculate the histogram standard deviation of each area separately, and the method to judge whether the image gray level changes smoothly is to calculate whether the image histogram standard deviation is lower than the preset The standard deviation threshold, lower than the threshold means flat, and higher than the threshold means larger changes.

Step A2. Set the watermark intensity that matches the high-temperature firing process, and apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target item surface, so that the color grayscale histogram standard corresponding to the target watermark setting area Deviation, after the watermark information is embedded, increase by more than the preset increase, and the watermark information is embedded in the electronic image of the target item surface; after the digital watermark is embedded, the standard deviation of the image histogram will increase, for the watermark that needs to be printed on the target item , The watermark strength is appropriate, and the criterion is to make the increase of the standard deviation of the image histogram exceed the preset increase.

Step A3. Divide the target watermark setting area in the electronic image of the target object surface so that the standard deviation of the color gray histogram corresponding to each block area is lower than the preset standard deviation threshold, and then go to step A4.

For the design of the above step A3, a preferred technical solution is further proposed, namely the following steps A3-1 to A3-2.

Step A3-1. Divide the undivided area in the target watermark setting area of the electronic image on the surface of the target item to obtain a block area whose standard deviation of the corresponding color grayscale histogram is lower than the preset standard deviation threshold, and proceed to step A3 -2.

When the block cannot be passed and the standard deviation of the image histogram of all block areas is lower than the preset standard deviation threshold, the condition can be relaxed, as long as a certain proportion of the block area meets the standard deviation of the image histogram is lower than the preset standard The condition of the deviation threshold is sufficient. That is, the above-mentioned further preferred design for step A3 only needs to stop the block division when the accumulated area of the block area exceeds 30% of the area of the target watermark setting area, which effectively reduces the amount of calculation and improves the work efficiency.

In practical applications, as shown in Figure 1, if the target object is ceramic, based on the preset standard deviation threshold of 3, if the target position for transferring the paper flower image on the ceramic is above the glaze layer, the firing temperature is around 200 degrees Celsius. For the preset fluctuation range, the preset increase is 4;

Step B. Use screen printing or digital printing to print the electronic image of the surface of the target article on the paper flower to form the paper flower image, and then proceed to step C. As shown in Figure 2, the paper flowers from top to bottom are transfer film, pigment, water-soluble film, and bottom paper.

In practical applications, if the target object is ceramic, in the process of printing the electronic image of the ceramic surface on the paper flower, a different firing temperature is selected based on the difference of the target position used to transfer the paper flower image on the ceramic. The firing temperature within the preset fluctuation range of degrees Celsius, using sublimation ink to print the electronic image of the ceramic surface on the paper flower; for firing temperatures above 500 degrees Celsius, select the corresponding mineral pigments that meet the firing temperature requirements to apply the ceramic surface The electronic image is printed on the paper flower.

In the above steps, the watermark image is burned into the target item, and the watermark information is completely integrated with the target item, and cannot be copied, destroyed, or reused, and the anti-counterfeiting traceability of the target item can be realized. For the specific verification and detection method of watermark information, the following steps I to II are executed to realize the target item watermark detection method.

Step I. Use a watermark collection device with image capture function to obtain an image of the surface of the target item, correct the image size, upload it to the server, and then proceed to step II.

The anti-counterfeiting method and ceramic anti-counterfeiting application designed based on the digital watermark matching high-temperature firing process designed by the above technical solution can embed different watermark information in each product image without changing the appearance of the product image, and store it in the database Associate richer information for each watermark information, such as: ceramic production information, author information, traceability information, etc. The information can be in the form of text, image, audio, video, etc.; in the production of watermarks, for high-temperature firing , The image will be fused and blurred. Choose a robust digital watermarking algorithm. At the same time, in order to have an anti-counterfeiting effect, the digital watermarking algorithm cannot be an absolutely robust algorithm. At the same time, when setting the watermark strength, it should be based on the original The invented watermark strength setting method is to set the watermark strength that matches the high-temperature firing process. For authenticity detection, it uses a mobile phone to take a picture and upload it to the server for watermark extraction, and judge the authenticity of the product based on the watermark information and its integrity In this way, fast and accurate anti-counterfeiting traceability of ceramic products is realized.

The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and can be made without departing from the purpose of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. Various changes.

Claims

An article anti-counterfeiting method based on a digital watermark matching high-temperature firing process, including a watermark information burning method for setting the watermark information on a fired target article, characterized in that the watermark information burning method includes the following steps:

Step A. Apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target item surface, and then proceed to step B;

Step B. Print the electronic image of the surface of the target item on the paper flower to form the paper flower image, and then proceed to step C;

Step C. Transfer the paper flower image to the target position on the target article and burn it to realize the setting of the watermark information on the target article.
An article anti-counterfeiting method based on a digital watermark matching high-temperature firing process according to claim 1, wherein said step A includes the following steps:

Step A1. Determine whether the standard deviation of the color grayscale histogram corresponding to the target watermark setting area in the electronic image of the target item surface is lower than the preset standard deviation threshold, if yes, go to step A2; otherwise, go to step A3;

Step A2. Set the watermark intensity that matches the high-temperature firing process, and apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target item surface, so that the color grayscale histogram standard corresponding to the target watermark setting area Deviation, increase by more than the preset increase after the watermark information is embedded, and complete the setting of embedding the watermark information in the electronic image on the surface of the target item;

Step A3. Divide the target watermark setting area in the electronic image of the target object surface, so that the standard deviation of the color gray histogram corresponding to each block area is lower than the preset standard deviation threshold, and then go to step A4;

Step A4. Set the watermark intensity that matches the high-temperature firing process, and apply the digital watermark method to embed the watermark information in the target watermark setting area in the electronic image of the target object surface, so that each block area corresponds to the color grayscale histogram The standard deviation and the pre-set increase after the watermark information is embedded are all increased, and the watermark information is embedded in the electronic image of the target item surface.
The article anti-counterfeiting method based on digital watermark matching high-temperature firing process according to claim 2, wherein said step A3 comprises the following steps:

Step A3-1. Divide the undivided area in the target watermark setting area of the electronic image on the surface of the target item to obtain a block area whose standard deviation of the corresponding color grayscale histogram is lower than the preset standard deviation threshold, and proceed to step A3 -2;

Step A3-2. Determine whether the area of the accumulated block area exceeds the preset percentage of the area of the target watermark setting area, if yes, stop the area division; otherwise, return to step A3-1.
An article anti-counterfeiting method based on a digital watermark matching high-temperature firing process according to claim 3, characterized in that: in step A3-2, it is determined whether the area of the accumulated block area exceeds the area of the target watermark setting area. 30%.
An article anti-counterfeiting method based on a digital watermark matching high-temperature firing process according to claim 1, characterized in that, in step B, screen printing or digital printing is used to print the electronic image of the surface of the target article on On the paper flower, make up an image of the paper flower.
The article anti-counterfeiting method based on digital watermark matching high-temperature firing process according to claim 1, characterized in that it further comprises a target article watermark detection method, comprising the following steps:

Step Ⅰ. Use a watermark collection device with image capture function to obtain an image of the surface of the target item, correct the image size, upload it to the server, and then proceed to step Ⅱ;

Step Ⅱ. The server extracts the watermark information in the obtained image, and judges whether the watermark information meets the integrity requirements, if yes, then extracts the information from it, combines with other information related to the information in the database, and returns to the watermark collection device. ; Otherwise, return to the watermark collection device prompting to re-shoot or judge to be a fake product.
An article anti-counterfeiting method based on digital watermark matching high-temperature firing process according to any one of claims 1 to 6, characterized in that: the target article is any of ceramics, glass, metal, plastic, purple sand, and ceramic tiles One kind.
A ceramic anti-counterfeiting application based on an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process according to any one of claims 1 to 7, characterized in that: the target article is ceramic, and the steps A to In the method of step C, the watermark information is set on the ceramic, and steps I to II are adopted to realize the detection of the watermark on the ceramic.
The ceramic anti-counterfeiting application of an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process according to claim 8, characterized in that: in the process of setting the watermark information on the ceramic by using the method from step A to step C, Based on a preset standard deviation threshold of 3,

If the target position for transferring the paper flower image on the ceramic is above the glaze layer, and the firing temperature is a preset fluctuation range of 200 degrees Celsius, the preset increase is 4;

If the target position for transferring the paper flower image on the ceramic is above the glaze layer, and the firing temperature is a preset fluctuation range of 800 degrees Celsius, the preset increase is 10;

If the target position for transferring the paper flower image on the ceramic is in the middle of the glaze layer, and the firing temperature is a preset fluctuation range of 1100 degrees Celsius, the preset increase is 11;

If the target position for transferring the paper flower image on the ceramic is below the glaze layer and above the ceramic embryo, and the firing temperature is a preset fluctuation range of 1300 degrees Celsius, the preset increase is 12.
The ceramic anti-counterfeiting application of an article anti-counterfeiting method based on a digital watermark matching high-temperature firing process according to claim 8 or 9, characterized in that: in the step B, the process of printing the electronic image of the ceramic surface on the paper flower Based on the difference in the target position for transferring the paper flower image on the ceramic, different firing temperatures are selected. For the firing temperature within the preset fluctuation range of 200 degrees Celsius, the sublimation ink is used to print the electronic image on the ceramic surface. On paper flowers: For firing temperatures above 500 degrees Celsius, the corresponding mineral pigments that meet the firing temperature requirements are selected to print the electronic image of the ceramic surface on the paper flowers.