CN110348553A - A kind of laser index carving method of random three-dimensional code - Google Patents

Abstract

The invention discloses a laser marking method for a random three-dimensional code, belonging to the field of laser processing, comprising: changing the black area of a two-dimensional code image into color to generate a three-dimensional code color image; generating a marking path according to the three-dimensional code color image, And classify the marking paths according to the color to obtain classified storage information; according to the classified storage information, use lasers to mark random 3D codes on the multi-layer anti-counterfeiting module; The kind of color in the image. In the present invention, when the marking time is fixed, the output power of the laser is modulated according to the received classified storage information, or when the output power of the laser is constant, the marking time is adjusted according to the received classified storage information. The module is marked with three-dimensional codes with different shades and a concave-convex feeling, which greatly improves the processing efficiency.

Description

A laser marking method for random three-dimensional code

technical field

The invention belongs to the field of laser processing, and more specifically relates to a laser marking method for a random three-dimensional code.

Background technique

QR code is a portable data file with high density and high information content. It can encode digital information such as photos, fingerprints, palm prints, signatures, voices, and texts. It is easy to make and low in cost. Dot matrix, laser, inkjet, thermal, card printing and other printing technologies can print two-dimensional barcodes on paper, cards, PVC, and even metal surfaces. It can be seen that two-dimensional codes play an important role in daily life as information carriers. role is becoming increasingly important.

At present, the two-dimensional code processed on the ordinary plane is easy to be copied, and the anti-counterfeiting ability is poor. Therefore, the random three-dimensional code adds random color information on the basis of the two-dimensional code, and processes it on a special multi-layer anti-counterfeiting material. With the characteristics of structure, three-dimensional, unique and non-reproducible, the combination of two-dimensional code and anti-counterfeiting overcomes the shortcomings of ordinary two-dimensional codes that are easy to be copied, and can be widely used in products that require strict anti-counterfeiting marks.

Since the random three-dimensional code was proposed recently, its processing technology is not yet mature enough. At present, the method of mechanical engraving is used to process the random three-dimensional code, and different depths are carved on the special multi-layer anti-counterfeiting material with a carving knife, showing different colors.

The traditional mechanical processing method is contact processing, which will cause mechanical extrusion and mechanical stress to the processed material. The processing is affected by the physical and mechanical properties of the material. The processing speed is slow and the processing efficiency is low, which cannot meet the needs of random 3D code processing.

Contents of the invention

Aiming at the defects of the prior art, the purpose of the present invention is to provide a laser marking method for random three-dimensional codes, aiming at solving the problem of low efficiency of the existing mechanical processing of random three-dimensional codes.

In order to achieve the above object, the present invention provides a laser marking method for a random three-dimensional code, including:

(1) Change the black area of the two-dimensional code image into color to generate a three-dimensional code color image;

(2) Generate the marking path according to the color image of the three-dimensional code, and classify the marking path according to the color, and obtain the classified storage information;

(3) According to the classified storage information, lasers are used to mark random three-dimensional codes on the multi-layer anti-counterfeiting module;

The multi-layer anti-counterfeiting module is superimposed by materials of different colors, and the colors of the materials include the color types in the color image of the three-dimensional code.

Preferably, step (1) specifically includes:

Divide the black area of the two-dimensional code image into several unit blocks of equal area, and set the size of the color block;

The size of the color block is an integer multiple of the unit block;

Divide the two-dimensional code image according to the color blocks, if the two-dimensional code image is not an integer multiple of the color block, then the remaining part of the two-dimensional code image after division is regarded as a color block;

The color block is randomly filled with different colors to generate a three-dimensional code color image.

Preferably, step (2) specifically includes:

(2.1) Utilize the edge process perimeter tracking method to extract the vector contour data of the three-dimensional code image;

(2.2) Generate a marking path according to the vector contour data;

(2.3) The generated marking path is classified according to the color in the color image of the three-dimensional code, and the classified storage information is obtained;

Preferably, the method for generating a marking path includes a contour filling method and a spiral tracing method;

The contour filling method uses the scanning line as the unit marking, selects the outermost circle vector contour of the two-dimensional code image, and then fills the contour with scanning lines until the scanning line marking path is generated;

The spiral tracking method marks the circle as a unit, first extracts the outermost circle vector contour of the two-dimensional code image, changes the pixel points of the current outermost circle vector contour to the background color to update the two-dimensional code image, and then extracts the updated two-dimensional The outermost vector outline of the code image, until the two-dimensional code image is the background color, generating a spiral marking path.

Preferably, the black area of the two-dimensional code image is randomly filled with three colors of red, green and blue in units of color blocks;

When classifying the marking path, red, green and blue are used as the foreground color in turn, and other colors are the background color, and the marking paths corresponding to the three colors are obtained;

The material of the first layer of the multi-layer anti-counterfeiting module is a white coating layer; the material of the second layer is green; the material of the third layer is red; the material of the fourth layer is blue;

In step (3), the method for the laser to mark on the multi-layer anti-counterfeiting module is:

When the marking time is fixed, the output power of the laser is modulated according to the received classified storage information, and the target color material on the multi-layer anti-counterfeiting module is marked;

Or when the output power of the laser is constant, the marking time is adjusted according to the received classification and storage information, and the target color material on the multi-layer anti-counterfeiting module is marked.

Through the above technical solutions conceived by the present invention, compared with the prior art, the following beneficial effects can be obtained:

(1) The laser marking method of the random three-dimensional code provided by the present invention first adds random multiple colors on the basis of the black and white two-dimensional code image to generate a three-dimensional code color image, which ensures the randomness of the three-dimensional code and ensures the anti-counterfeiting Function; based on the color image of the three-dimensional code, according to the color information, the vector marking paths corresponding to different colors are obtained as classified storage information; according to the classified storage information, the laser output laser beam is used to mark random three-dimensional marks on the multi-layer anti-counterfeiting module Code; when the marking time is fixed, the output power of the laser is modulated according to the received classified storage information, or when the laser output power is constant, the marking time is adjusted according to the received classified storage information, and the multi-layer anti-counterfeiting The module is marked with three-dimensional codes with different shades and a concave-convex feeling, which greatly improves the processing efficiency compared with traditional mechanical processing. In the marking process, the method of modulating the output power of the laser in real time is more efficient than the method of adjusting the marking time with a certain output power.

(2) The present invention adopts the edge process perimeter tracking method to extract the vector contour data of the two-dimensional code image; two methods for generating marking paths are provided, including the contour filling method and the spiral tracing method; wherein, the spiral tracing method takes circle as a unit Marking and contour filling method mark with scanning line as the unit. Compared with the contour filling method, the spiral tracking method obtains a marking path that takes a shorter distance during the marking process, and the marking efficiency is higher.

(3) The present invention divides the black region of the two-dimensional code image into several unit blocks equal in area, and sets the size of the color block, which is an integer multiple of the unit block; divides the two-dimensional code image according to the color block Divide, the size of each color block is equal, if the two-dimensional code image is not an integer multiple of the color block, then the remaining part of the two-dimensional code image after division is used as a color block; with the color block as a unit, randomly fill the color to obtain the color image of the three-dimensional code , which avoids the problem of high complexity of subsequent classification and storage of data due to the different sizes and irregularities of each color block. Therefore, compared with the 3D code color image generated without any color block division and unit block division Therefore, the three-dimensional code color image of the present invention has lower color clutter and is more conducive to recognition.

(4) The present invention randomly fills the black area of the two-dimensional code image with three colors of red, green and blue; correspondingly, the multi-layer anti-counterfeiting module is designed as a white coating layer for the first layer of material; its second layer of material is green ;The material of the third layer is red; the material of the fourth layer is blue, which ensures the feasibility of laser marking three-dimensional codes with different shades and concave-convex feeling. At the same time, the difference between the three colors and white is high. , It is easier to distinguish while ensuring anti-counterfeiting.

Description of drawings

Fig. 1 is the flowchart of laser marking random three-dimensional code color image provided by the present invention;

Fig. 2 is a schematic diagram of generating a three-dimensional code color image from a black and white two-dimensional code image provided by an embodiment;

Fig. 3 is a schematic diagram of the marking path obtained from the color image of the three-dimensional code provided by the embodiment.

Fig. 4 is a schematic structural diagram of a multi-layer anti-counterfeiting module provided by the embodiment.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The invention provides a laser marking method for random three-dimensional codes. A laser marking machine is used to process random, colorful and structured three-dimensional codes of different shades on a special multi-layer anti-counterfeiting module. The advantages of fast processing speed and high efficiency overcome the shortcomings of low efficiency of traditional mechanical processing.

As shown in Figure 1, the present invention provides a laser marking method for a random three-dimensional code, including:

(1) Change the black area of the two-dimensional code image into color to generate a three-dimensional code color image;

(2) Generate the marking path according to the color image of the three-dimensional code, and classify the marking path according to the color, and obtain the classified storage information;

(3) According to the classified storage information, lasers are used to mark random three-dimensional codes on the multi-layer anti-counterfeiting module;

The multi-layer anti-counterfeiting module is superimposed by materials of different colors, and the colors of the materials include the color types in the color image of the three-dimensional code.

Preferably, as shown in Figure 2, step (1) specifically includes:

(1.1) divide the black region of the two-dimensional code image into several unit blocks with equal areas, and set the size of the color block;

The size of the color block is an integer multiple of the unit block;

(1.2) divide the two-dimensional code image according to the color block, if the two-dimensional code image is not an integer multiple of the color block, then the remaining two-dimensional code image after division is used as a color block;

(1.3) The color block is randomly filled with different colors to generate a three-dimensional code color image.

Preferably, as shown in Figure 3, step (2) includes:

(2.1) Utilize the edge process perimeter tracking method to extract the vector contour data of the three-dimensional code image;

(2.2) Marking according to the vector contour data to generate a marking path;

(2.3) The generated marking path is classified according to the color in the color image of the three-dimensional code, and the classified storage information is obtained.

Preferably, the method for generating a marking path includes a contour filling method and a spiral tracing method;

As shown in Figure 3, the contour filling method uses the scanning line as the unit marking, selects the outermost vector contour of the two-dimensional code image, and then fills the contour with scanning lines until the scanning line marking path is generated;

The spiral tracking method marks the circle as a unit, first extracts the outermost circle vector contour of the two-dimensional code image, changes the pixel points of the current outermost circle vector contour to the background color to update the two-dimensional code image, and then extracts the updated two-dimensional The outermost vector outline of the code image, until the two-dimensional code image is the background color, generating a spiral marking path.

Example

(1) Change the black area of the two-dimensional code image into color to generate a three-dimensional code color image;

Traverse the entire image on the black and white two-dimensional code image to obtain the size of the unit block that can form the black area of the image, define the size of the color block according to the size of the unit block, the size of the color block is an integer multiple of the size of the unit block, and convert the entire black and white two-dimensional code The image is divided according to the size of the color block. If the image size of the two-dimensional code is not an integer multiple of the color block, the remaining area is regarded as a color block, and the entire two-dimensional code image is traversed, and the black area corresponding to the same color block is randomly changed. One of the three colors of red, green, and blue (R, G, B), the white area remains unchanged, and finally a random color three-dimensional code image is generated;

By setting the size of the color block, the color clutter of the three-dimensional code color image can be controlled. Due to the randomness of the color information, the randomness of the three-dimensional code image is guaranteed, making it difficult to copy the three-dimensional code and improving the anti-counterfeiting ability;

The two-dimensional code is a QR code. In this embodiment, the above-mentioned two-dimensional code can be any type of two-dimensional code that currently exists, and there is no limitation on its specific type;

(2) Generate the marking path according to the color image of the three-dimensional code, and classify the marking path according to the color, and obtain the classified storage information;

Use the edge process contour tracking method to extract the vector contour data of the two-dimensional code image; and then obtain the marking path, as follows:

After obtaining the outermost contour of the two-dimensional code image, change the pixels of the contour into the background color, and then use the contour tracking method to obtain the outermost contour on the transformed image, and repeat the above operations in turn until two All the pixels in the two-dimensional code image become the background color, and the spiral marking path can be obtained;

As shown in Figure 3, in the process of obtaining the above marking path, the marking path corresponding to the area of different colors is obtained by selecting the foreground color, as follows: select green as the foreground color, and the area of other colors is the background color, and obtain The marking path corresponding to the green area; select red as the foreground color, then the other color areas are the background color, and obtain the marking path corresponding to the red area; select blue as the foreground color, then the other color areas are the background color, and obtain blue The marking path corresponding to the colored area;

(3) According to the classified storage information, lasers are used to mark random three-dimensional codes on the multi-layer anti-counterfeiting module;

As shown in Figure 4, the first layer of material of the multi-layer anti-counterfeiting module is a white coating layer; its second layer of material is green; its third layer of material is red; its fourth layer of material is blue; Among them, by changing the PWM output duty cycle of the carbon dioxide laser, the output power of the laser is controlled in real time, and different output powers mark different depths on the multi-layer anti-counterfeiting module at the same time, thus presenting different colors; When marking the green area in the three-dimensional code, the PWM output duty cycle is the smallest, so that the output power of the laser can mark off the white coating layer of the first layer, showing the green color of the second layer; when marking the red area in the three-dimensional code When the PWM output duty cycle is increased, the marking thickness is greater than the sum of the first layer and the second layer, but less than the sum of the first three layers, showing the red color of the third layer; in marking the three-dimensional code In the blue area, the PWM output duty cycle is the largest, making the marked thickness greater than the sum of the first three layers and less than the total thickness of the material, showing the blue color of the fourth layer. After completing one processing path, you can get random , colorful, structured 3D codes in different shades;

To sum up, the laser marking method of random three-dimensional code provided by the present invention firstly adds random multiple colors on the basis of black and white two-dimensional code image to generate three-dimensional code color image, which ensures the randomness of three-dimensional code and guarantees Anti-counterfeiting function; on the basis of the color image of the three-dimensional code, according to the color information, the vector marking paths corresponding to different colors are obtained as classified storage information; according to the classified storage information, the laser output laser beam is used to mark randomly on the multi-layer anti-counterfeiting module Three-dimensional code; when the marking time is fixed, the output power of the laser is modulated according to the received classified storage information, or when the laser output power is constant, the marking time is adjusted according to the received classified storage information, and the processing path can be quickly processed in multiple layers The anti-counterfeiting module is marked with three-dimensional codes with different shades and a concave-convex feeling, which greatly improves the processing efficiency compared with traditional mechanical processing. In the marking process, the method of modulating the output power of the laser in real time is more efficient than the method of adjusting the marking time with a certain output power.

The marking path generated by the spiral tracking method is marked in units of circles, and the marking path generated by the contour filling method is marked in units of scan lines. Compared with the contour filling method, the marking path of the spiral tracing method is significantly shortened, and the marking efficiency Can be significantly improved.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (7)

1. A laser marking method of a random three-dimensional code, characterized in that, comprising: (1) Change the black area of the two-dimensional code image into color to generate a three-dimensional code color image; (2) generate marking paths according to the color image of the three-dimensional code, and classify the marking paths according to the colors, and obtain classified storage information; (3) According to the classified storage information, lasers are used to mark random three-dimensional codes on the multi-layer anti-counterfeiting module; The multi-layer anti-counterfeiting module is superimposed by materials of different colors, and the colors of the materials include the color types in the color image of the three-dimensional code. 2. The laser marking method according to claim 1, wherein step (1) specifically comprises: (1.1) divide the black region of the two-dimensional code image into several unit blocks with equal areas, and set the size of the color block; The size of the color block is an integer multiple of the unit block; (1.2) divide the two-dimensional code image with the color block as a unit, if the two-dimensional code image is not an integer multiple of the color block, then the remaining two-dimensional code image after division is used as a color block; (1.3) The color block is randomly filled with different colors to generate a three-dimensional code color image. 3. The laser marking method according to claim 1 or 2, wherein step (2) comprises: (2.1) Utilize the edge process perimeter tracking method to extract the vector contour data of the three-dimensional code image; (2.2) Generate a marking path according to the vector contour data; (2.3) The generated marking path is classified according to the color in the color image of the three-dimensional code, and the classified storage information is obtained. 4. The laser marking method according to claim 3, wherein the method for generating a marking path comprises a contour filling method and a spiral tracing method; The contour filling method uses scanning lines as units to mark, obtains the outermost vector contour of the two-dimensional code image, and then fills the contour with scanning lines to generate a scanning line marking path; The spiral tracking method marks the circle as a unit, first extracts the outermost circle vector outline of the two-dimensional code image, changes the pixel points of the current outermost circle vector outline to the background color to update the two-dimensional code image, and then extracts the updated two-dimensional The outermost vector outline of the code image, until the two-dimensional code image is the background color, generating a spiral marking path. 5. laser marking method according to claim 1, is characterized in that, in described step (3), the method that laser device marks on multi-layer anti-counterfeiting module is: When the marking time is fixed, the output power of the laser is modulated according to the received classified storage information, and the target color material on the multi-layer anti-counterfeiting module is marked; Or when the output power of the laser is constant, the marking time is adjusted according to the received classification and storage information, and the target color material on the multi-layer anti-counterfeiting module is marked. 6. The laser marking method according to any one of claims 1 to 5, wherein the black area of the two-dimensional code image is randomly filled with three colors of red, green and blue in units of color blocks; The material of the first layer of the multi-layer anti-counterfeiting module is a white coating layer; the material of the second layer is green; the material of the third layer is red; the material of the fourth layer is blue. 7. The laser marking method according to claim 6, wherein when the marking paths are classified, red, green and blue are used as foreground colors in turn, and other colors are used as background colors to obtain markings corresponding to the three colors path.