CN111556221B - Printed matter halftone information hiding and hiding method based on electronic hiding tool - Google Patents

Abstract

The invention discloses a halftone information hiding and revealing method of printed matter based on an electronic revealing and concealing tool. The two-dimensional code on the printed matter is scanned by a mobile phone to access the halftone concealed information image with anti-counterfeiting information; according to the screening of the halftone image Physical parameters, according to the generation algorithm of the dots of the electronic revealing and concealing tool, generate the electronic dots revealing and concealing tool that can display the halftone hidden information, and automatically display the hidden information through the loading and matching of the electronic dot revealing and concealing tool and the halftone concealing information image. information; the method can improve the efficiency and experience of consumers in verifying the authenticity of products, making the anti-counterfeiting verification of printed matter more direct and efficient.

Description

A halftone information hiding and revealing method for printed matter based on electronic revealing and concealing tools

technical field

The invention belongs to the technical field of anti-counterfeiting of printed matter, relates to a halftone image hidden information display technology of printed matter, and in particular relates to a halftone information hiding and revealing and concealing method of printed matter based on an electronic revealing and concealing tool.

Background technique

With the continuous development of society and economy, the dazzling variety of products has brought great improvement to people's quality of life. The effective printing and packaging of products has played an extremely important role in the promotion and circulation of products. The anti-counterfeiting effect of printing on the outer packaging of goods can not only protect the goods and increase the value of the products themselves, but also attract consumers and promote the sales of goods by virtue of their innovative appearance and direction of counterfeiting. Therefore, more and more enterprises have begun to pay attention to the anti-counterfeiting performance of their products, and regard it as a breakthrough in the innovation of their own products to improve the performance and quality of their products. In recent years, traditional anti-counterfeiting technologies for printed matter have mainly focused on ink anti-counterfeiting, paper anti-counterfeiting and printing process anti-counterfeiting, which have curbed the occurrence of piracy to a certain extent. At the same time, it puts forward higher requirements for production technology and equipment, which limits the wide application of technology.

In recent years, with the rapid development of the Internet and computer technology, it has provided new support for printing anti-counterfeiting technology. Halftone anti-counterfeiting technology. Because the halftone anti-counterfeiting technology of printed matter is a method that does not change the printing process and does not increase the extra cost of the product, it has attracted much attention from enterprises and industries. The display of halftone hidden anti-counterfeiting information is realized under specific conditions through printing or printed physical grating tools. However, the reliability and convenience of such a physical grating have certain limitations in use, which affects the consumer's counterfeiting experience.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a halftone information hiding and revealing method of printed matter based on electronic revealing and concealing tools, access to concealed information through a two-dimensional code, and realize the acquisition of halftone concealed information images by scanning on a mobile phone, thereby improving the The efficiency and experience of consumers verifying the authenticity of products makes the anti-counterfeiting verification of printed matter more efficient.

In order to achieve the above objects, the present invention adopts the following technical solutions.

A halftone information hiding and revealing method for printed matter based on an electronic revealing and concealing tool, comprising the following steps:

Step 1: Make the original carrier image, and set the halftoning of the image;

Step 2: Embed the hidden information into the halftone image carrier image in Step 1, and perform the change processing of the hidden information to complete the hidden setting of the information;

Step 3: store the halftone hidden information image containing the hidden information produced in step 2 in the server, and create a two-dimensional code corresponding to the image;

Step 4: generating a dot-type electronic display and concealment tool on the mobile terminal display platform according to the dot physical structure parameters of the halftone image in step 1;

Step 5: The dot-type electronic display and concealment tool generated in Step 4 is superimposed on the halftone hidden information image through the mobile terminal platform, so as to realize the display of the hidden information.

Further, in step 1, create a file in Photoshop with a size of (1-10) cm×(1-10) cm, an output resolution of 800-2400 dpi, and a grayscale color mode to obtain the original carrier image.

Further, in the step 1, the obtained original carrier image is filled with the foreground color, and the fill rate of the foreground color is 25%-70%, and then the halftone screen operation is performed in the bitmap mode, the number of screen lines is 100-200lpi, and the The screen angle was 45° and the dot shape was circular, resulting in a halftone image.

Further, in the step 2, the hidden information is a grayscale image of (1-10) cm×(1-10) cm.

Further, in the step 2, the hidden information is embedded in the halftone image, the boundary of the hidden information is extracted, the non-boundary part is removed, and the dot information within the boundary of the hidden information is subjected to a slight displacement transformation to complete the hidden setting of the information.

Further, in the step 3, the two-dimensional code corresponding to the halftone hidden information image containing the hidden information stored in the server is made, and after the user scans the two-dimensional code to access the server, enter the page to download the halftone image and save it to the mobile phone for storage. space.

Further, in the step 4, when generating the dot-type electronic display and concealment tool, take the upper left corner (0, 0) point of the display window of the mobile phone as the starting point, and take the screen angle of 45° as the limit, including the dots on 45 degrees, 45 degrees on the mobile phone screen refers to the left angle between the upper left corner and the lower right corner;

When the screen point is limited by the screen angle of 45°, including the screen point above 45 degrees, the generation rule is line generation, that is, line by line, and the coordinate points (X _i , Y _j ) of the electronic display and concealment tool network point are as follows. Formula calculation:

X _i =W·(i-1)

When the screen point is limited by the screen angle of 45°, and the screen point including 45° is generated to the lower left, the generation rule is column generation, that is, column _generation , column by _column . The following formula calculates:

X _j =W·(j-1) (4)

i表示行标，j表示为列标；上述公式中“[ ]”代表取整,M为手机屏幕横向像素点数，N等于电子显隐工具纵向像素点数。Wherein, W is the width of the dots of the electronic display and concealment tool, D is the output resolution of the halftone image, and L is the number of screen lines of the halftone image;

i means row index, j means column index; in the above formula, "[ ]" means rounding, M is the number of horizontal pixels of the mobile phone screen, and N is equal to the number of vertical pixels of the electronic display and concealment tool.

Further, in the described step 4, according to the coordinates of the calculated electronic display and concealment tool network points, by using the drawPoints function in the Android development platform Android Studio, the generation of the electronic display and concealment tools is completed, wherein the color of the network point is designated as black, and the color of the network point is black. The shape is square.

Further, in the step 5, the halftone hidden information image stored in the mobile phone is retrieved through the mobile phone terminal platform and displayed in the display area of the mobile phone terminal, and the electronic display and concealment tool in step 4 is loaded on the halftone hidden information image, Realize the display of hidden information.

The beneficial effects of the present invention are:

The invention is based on an electronic display and concealment tool for hiding halftone information of printed matter and a method for revealing and concealing it. By printing a two-dimensional code on the printed matter, the access to the halftone hidden information is realized, and the two-dimensional code on the printed matter is scanned by a mobile phone to access the anti-counterfeiting information. The halftone hidden information image of the information; according to the screening physical parameters of the halftone image, according to the generation algorithm of the dots of the electronic revealing tool, an electronic dot revealing and concealing tool that can display the halftone hidden information is generated. The loading and matching of halftone hidden information images automatically displays hidden information and provides real-time feedback to consumers on the anti-counterfeiting effect of printed products; it can improve the efficiency and experience of consumers in verifying the authenticity of products, and make the anti-counterfeiting verification of printed products more direct and effective. More efficient, improve the printing and packaging performance of products, and promote commodity sales.

Description of drawings

Fig. 1 is a kind of halftone information hiding and revealing method flow chart of printed matter based on electronic revealing and concealing tools

Figure 2 shows the information to be hidden

Figure 3 is an image with hidden information

Figure 4 shows the QR code corresponding to the halftone hidden information image

Figure 5 shows the electronic display and concealment tool on the mobile phone

Figure 6 is a rendering of hidden information reproduction

Detailed ways

The present invention will be described in further detail below with reference to specific embodiments, but it is not intended to limit the present invention.

As shown in Figure 1, the present invention is based on the halftone information concealment and the method of revealing and concealing of printed matter based on electronic revealing and concealing tools, and the concrete flow is as follows:

Step 1: Make the original carrier image and make halftoning settings for the image. Create a new file in Photoshop with a size of (1～10)cm×(1～10)cm, an output resolution of 800-2400dpi, and a grayscale color mode. Fill the image with the foreground color, and set the fill value in the range of 25%-70%.

Perform halftone screen operation on the image in bitmap mode, the number of screen lines is 100-200lpi, the screen angle is 45°, and the shape of the dots is circular to form a halftone image.

Step 2: Select a grayscale file (image or text) with size (1~10)cm×(1~10)cm as hidden information and embed it in the halftone image, extract the boundary of the hidden information, and remove the non-boundary part. A small amount of displacement transformation is performed on the dot information within the boundary of the hidden information to complete the hidden setting of the information.

Step 3: Store the halftone image containing the hidden information produced in Step 2 in the server, and create a two-dimensional code corresponding to the image. The halftone image containing hidden information stored in the server has a unique access address. After the user scans the QR code to access the server, the user can download the halftone image and save it to the storage space of the mobile phone.

Step 4: A dot-type electronic display and concealment tool is generated on the mobile terminal display platform according to the dot physical structure parameters of the halftone image in Step 1. The generation of the dot-type electronic display and concealment tool starts from the upper left corner (0, 0) of the display window of the mobile phone, and takes the screen angle (45 degrees) as the limit (including the dots on the 45 degree, 45 degrees refers to the mobile phone screen). is the left angle of the line connecting the upper left and lower right).

When the screen dots are generated to the right with the screen angle (45 degrees) as the limit (including the dots on 45 degrees), the generated rule is line generation (ie, line by line generation), the coordinate points of the electronic display and concealment tool network points (X _i , Y _j ) is calculated according to the following formula:

X _i =W·(i-1) (1)

When the dots are generated to the left with the screen angle (45 degrees) as the limit (including the dots on 45 degrees), the generated rule is column generation (ie, column by column generation), the coordinates of the dots of the electronic display and concealment tools (X _j , Y _i ) is calculated according to the following formula:

X _j =W·(j-1) (4)

i表示行标，j表示为列标；上述公式中“[]”代表取整,M为手机屏幕横向像素点数，N等于电子显隐工具纵向像素点数。Wherein, W is the width of the dots of the electronic display and concealment tool, D is the output resolution of the halftone image, L is the number of screen lines of the halftone image, and S is the dot area ratio of the background image;

i means row index, j means column index; in the above formula, "[]" means rounding, M is the number of horizontal pixels of the mobile phone screen, and N is equal to the number of vertical pixels of the electronic display and concealment tool.

According to the calculated coordinates of the network point of the electronic display and concealment tool, the generation of the electronic display and concealment tool is completed by using the drawPoints function in the Android development platform (Android Studio) (the color of the network point is specified as black, and the shape of the network point is square).

Step 5: The dot-type electronic display and concealment tool generated in Step 4 is superimposed on the halftone hidden information image through the mobile terminal platform, so as to realize the display of the hidden information. The halftone hidden information image stored in the mobile phone is retrieved through the mobile terminal platform and displayed in the display area of the mobile phone. The electronic display and concealment tool in step 4 is loaded on the halftone hidden information image to realize the display of the hidden information.

Example

Taking Photoshop and a mobile phone of a well-known domestic brand as an example, the process of revealing and concealing halftone information images is implemented. details as follows:

Step 1: Make a halftone original carrier image, create a new file in Photoshop with a size of 6cm×6cm, output a file with a resolution of 1050dpi and a color mode of grayscale, and set its dot area rate to 30%. Perform halftone screen operation on the image in bitmap mode, set the screen line number to 175lpi, the screen angle to 45°, and the dot shape to be circular.

Step 2: Take Figure 2 as the information to be hidden (3.5cm×3.5cm), convert it into grayscale mode, embed it in the background image, extract the boundary of the hidden information, and remove the non-boundary part. A small amount of displacement transformation is performed on the dot information within the boundary of the hidden information to complete the hidden setting of the information. The halftone hidden information image is shown in Figure 3.

Step 3: Store the halftone image containing the hidden information produced in Step 2 in the server, and create a two-dimensional code corresponding to the image, as shown in FIG. 4 . A halftone image with hidden information stored on a server with a unique access address. After the user scans the QR code to access the server, the user can enter the page to download the halftone image and save it to the storage space of the mobile phone.

Step 4: Calculate according to the generation method of the electronic network point display and concealment tool, and generate its electronic network point display and concealment tool, wherein, D=1050dpi; M=1080; N=1080; L=175lpi; S=0.3; (6) Solving the network point coordinates of the electronic display and hidden tools. Taking 45° as the boundary line, including the dots on the boundary, the right side of the boundary is generated row by row according to the coordinate points; the left side of the boundary is generated column by column according to the coordinate points.

Using the programming implementation of the drawPoints function in the Android development platform (Android Studio), the generation of the electronic display and concealment tool is completed (the color of the network point in the function is specified as black, and the shape of the network point is square), as shown in Figure 5.

Step 5: The dot-type electronic display and concealment tool generated in Step 4 is superimposed on the halftone hidden information image through the mobile terminal platform, so as to realize the display of the hidden information. The rendering effect diagram is shown in Figure 6, which completes the intelligent display of halftone information.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: Modifications or equivalent substitutions are made to the specific embodiments, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention shall all be included in the scope of the present claims.

Claims (6)

1. A printed matter halftone information hiding and hiding method based on an electronic hiding tool is characterized by comprising the following steps:

step 1: making an original carrier image, and carrying out halftone setting on the image to obtain a halftone image carrier image;

step 2: embedding the hidden information into the halftone image carrier image in the step 1, and performing change processing on the hidden information to obtain a halftone hidden information image and complete the hidden setting of the information;

and step 3: storing the halftone hidden information image loaded with the hidden information manufactured in the step 2 into a server, and manufacturing a two-dimensional code corresponding to the image;

and 4, step 4: generating a dot type electronic display and hiding tool on a mobile phone terminal display platform according to the dot physical structure parameters of the halftone image carrier image in the step 1;

when the dot type electronic display and hidden tool is generated, a point at the upper left corner (0, 0) of a display window of the mobile phone end is taken as a starting point, a screen adding angle of 45 degrees is taken as a boundary, dots at 45 degrees are included, and the 45 degrees refer to a left-direction included angle of a connecting line between the upper left corner and the lower right corner on a mobile phone screen;

when the dot is generated to the upper right with the dot at 45 degrees and with the screen angle of 45 degrees as a boundary, the rule is line generation, namely line generation, and the coordinate point (X) of the dot of the electronic display and hidden tool_i,Y_j) Calculated according to the following formula:

X_i＝W·(i-1)(1)

when the dot is generated from the dot at the screening angle of 45 degrees to the left and down, the rule is column generation, i.e. one column generation, and the coordinate point (X) of the dot of the electronic display and hidden tool_j,Y_i) Calculated according to the following formula:

X_j＝W·(j-1) (4)

wherein, W is the width of the mesh point of the electronic display and hidden tool, D is the output resolution of the halftone image, and L is the number of the screen lines of the halftone image; s is the area ratio of the dots of the background image;

i represents a row label and j represents a column label; the above formula]"represents rounding, M is the number of horizontal pixels of the mobile phone screen, N is equal to the number of longitudinal pixels of the electronic display and hiding tool；

And 5: and (4) superposing the dot type electronic display and hiding tool generated in the step (4) on the halftone hidden information image through a mobile phone terminal platform to realize the display of the hidden information.

2. The halftone information hiding and hiding method for printed matters based on the electronic hiding tool as claimed in claim 1, wherein: and (2) performing foreground color filling on the obtained original carrier image in the step (1), wherein the foreground color filling rate is 25-70%, and then performing halftone screening operation in a bitmap mode, wherein the screening lines are 100-200lpi, the screening angle is 45 degrees, and the screen dots are circular, so that a halftone image carrier image is formed.

3. The halftone information hiding and hiding method for printed matters based on the electronic hiding tool as claimed in claim 1, wherein: in the step 2, the hidden information is embedded into the halftone image carrier image, the boundary of the hidden information is extracted, the non-boundary part is removed, the dot information in the hidden information boundary is subjected to micro displacement transformation to obtain a halftone hidden information image, and the hidden setting of the information is completed.

4. The halftone information hiding and hiding method for printed matters based on the electronic hiding tool as claimed in claim 1, wherein: in the step 3, a two-dimensional code corresponding to the halftone hidden information image containing the hidden information stored in the server is manufactured, and after the user scans the two-dimensional code to access the server, the user enters a page to download the halftone hidden information image and stores the halftone hidden information image in the storage space of the mobile phone.

5. The halftone information hiding and hiding method for printed matters based on the electronic hiding tool as claimed in claim 1, wherein: in the step 4, according to the calculated coordinates of the dots of the electronic hiding tool, the generation of the electronic hiding tool is completed by applying a drawPoints function in an Android Studio of an Android development platform, wherein the color of the dots is designated as black, and the shape of the dots is square.

6. The halftone information hiding and hiding method for printed matter based on electronic hiding tool as claimed in claim 5, wherein: in the step 5, the halftone hidden information image stored in the mobile phone is called by the mobile phone terminal platform and displayed in the mobile phone terminal display area, and the electronic display and hiding tool in the step 4 is loaded on the halftone hidden information image, so that the display of the hidden information is realized.

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