Dynamic holographic anti-counterfeiting pattern generation method and system, computer and storage medium

Abstract

The application provides a dynamic holographic anti-counterfeiting pattern generation method, which comprises the following steps: preparing a group of pictures with continuously changing postures; dividing each picture into several areas according to different brightness values; setting the picture size and vertical grid pixel after linear grating filling, and there are a plurality of grids in the size range of each picture; if the group of pictures after linear grating filling has a plurality of pictures, then each grid is evenly divided into the same number of frames as the number of pictures, and the size of each frame is the same; then, each picture is sequentially placed in the grid, the first picture only retains the first frame of each grid, the next picture only retains the next frame of each grid, and the last picture only retains the last frame of each grid; a cylindrical lens matrix model is established, and the cylindrical lens matrix model is subjected to one-time photo-etching and two-time photo-etching, and the dynamic holographic anti-counterfeiting pattern is obtained after photo-etching.

Description

Technical Field

[0001] This invention relates to the field of anti-counterfeiting image technology, and in particular to a method, system, computer, and storage medium for generating dynamic holographic anti-counterfeiting patterns. Background Technology

[0002] Moiré fringes create grating animations, but this technology often requires two layers: an image layer and a mask / lens layer. However, this is difficult to apply to single-layer film structures in holographic anti-counterfeiting. Existing technologies require a double-layer structure: an image layer and a mask or lens layer. If it's a mask layer, the two layers need some movement to observe the dynamic effect. If it's a lens layer, the two layers can be fixed together, but a certain distance is needed so that the micro-image information array is near the focal point of the lens array to achieve the imaging effect. This is very difficult to achieve in terms of manufacturing, requiring alignment, a certain film thickness, and low yield, making mass production difficult.

[0003] Therefore, it is necessary to provide a novel method, system, computer, and storage medium for generating dynamic holographic anti-counterfeiting patterns to overcome the aforementioned shortcomings. Summary of the Invention

[0004] The purpose of this invention is to provide a method for generating dynamic holographic anti-counterfeiting patterns. The holographic anti-counterfeiting film pattern produced has a dynamic effect that is no less than that of grating animation with a double-layer lens structure. Moreover, since its structure is single-layer, the process is no different from that of traditional holographic anti-counterfeiting film preparation, and the process is easy to implement and therefore can be easily industrialized.

[0005] To achieve the above objectives, the present invention provides a method for generating dynamic holographic anti-counterfeiting patterns, comprising the following steps:

[0006] S1. Prepare a set of images showing continuous changes in posture;

[0007] S2. Divide each image in the set of images described in step S1 into several regions according to different brightness values, and fill each region with a linear raster in a different direction.

[0008] S3. Set the size and vertical grid pixel of the image filled with straight lines as described in step S2. There are a total of several grids within the size range of each image. If there are multiple images filled with straight lines after processing, then divide each grid into a number of frames equal to the number of images, and each frame is the same size.

[0009] Next, each image is placed into the grid in turn. The first image only retains the first frame of each grid, the next image only retains the next frame of each grid, and the last image only retains the last frame of each grid.

[0010] S4. Establish a cylindrical lens matrix model and arrange it in an array in the vertical direction. The size of the array after arrangement is the same as the size of the vertical grid in step S3.

[0011] S5. Perform one and two photolithography processes on the cylindrical lens matrix model to obtain a dynamic holographic anti-counterfeiting pattern.

[0012] Preferably, each region is filled with linear gratings in different directions.

[0013] Preferably, the width of the cylindrical lens is between 30-100 μm, the period of the linear grating is between 1-50 μm, and the depth of the photolithographic structure is 2-3 μm.

[0014] Preferably, the size of the array after arrangement is the same as the size of the vertical grid.

[0015] Preferably, the maximum exposure power for a single photolithography step is 100%, and the maximum exposure power for a single or double photoetching step is 50%.

[0016] A dynamic holographic anti-counterfeiting pattern generation system includes: an acquisition module, a region division and filling module, and an etching unit;

[0017] The acquisition module, region partitioning and filling module, and etching unit are communicatively connected. The acquisition module is used to acquire a set of continuously changing posture images and transmit the acquired continuously changing posture images to the region partitioning and filling module.

[0018] The region division and filling module is used to divide each image in the image into several regions according to different brightness values. Each region is filled with linear rasteres in different directions to establish a cylindrical lens matrix model.

[0019] The etching unit performs optical etching on the cylindrical lens matrix model to create a dynamic holographic anti-counterfeiting pattern.

[0020] A computer includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the dynamic holographic anti-counterfeiting pattern generation method.

[0021] A readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the dynamic holographic anti-counterfeiting pattern generation method described above.

[0022] Compared with existing technologies, the advantages are that the holographic anti-counterfeiting film pattern produced has a dynamic effect that is no less than that of the grating animation effect of the double-layer lens structure. Moreover, since its structure is single-layer, the process is no different from that of traditional holographic anti-counterfeiting film preparation, and the process is easy to implement, so it is very easy to industrialize.

[0023] Other features and advantages of the invention will be set forth in the following description, and in part will be apparent from the description, or may be learned by practice of the invention. The features and advantages of the invention may be realized and obtained by means of the elements and combinations specifically pointed out in the appended claims. These and other features of the invention will become more apparent from the following description and the appended claims, or may be learned by practice of the embodiments described herein. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 The first image is a schematic diagram for an embodiment of the present invention.

[0026] Figure 2 The second image is a schematic diagram for an embodiment of the present invention.

[0027] Figure 3 The third image is a schematic diagram for an embodiment of the present invention.

[0028] Figure 4 for Figure 1 The diagram after filling in the blanks.

[0029] Figure 5 for Figure 2 The diagram after filling in the blanks.

[0030] Figure 6 for Figure 3 The diagram after filling in the blanks.

[0031] Figure 7 This is a schematic diagram of the cylindrical lens matrix model established in an embodiment of the present invention.

[0032] Figure 8 for Figure 7 The diagram shows a cylindrical lens matrix model at one angle.

[0033] Figure 9 for Figure 7 A schematic diagram of the cylindrical lens matrix model shown from another angle.

[0034] Figure 10 for Figure 7 A schematic diagram of the cylindrical lens matrix model shown from another angle.

[0035] Figure 11This is a schematic diagram of the beam splitting principle of the cylindrical lens matrix model after photolithography in an embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the invention and are not intended to limit the invention.

[0037] It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0038] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0040] This invention provides a method for generating dynamic holographic anti-counterfeiting patterns, comprising the following steps:

[0041] S1. Prepare a set of images showing continuously changing postures. Figures 1-3 The image depicts the dynamic effect of a butterfly's wings gradually opening.

[0042] S2, take the set of images described in step S1 (i.e.) Figures 1-3 Each image in the dataset is divided into several regions based on different brightness values, and each region is filled with linear raster lines in different directions. Figures 1-3 The effects after filling are as follows: Figures 4-6 As shown.

[0043] S3. Set the size and vertical grid pixel of the image filled with straight lines as described in step S2. There are a total of several grids within the size range of each image. If there are multiple images filled with straight lines after processing, then divide each grid into a number of frames equal to the number of images, and each frame is the same size.

[0044] Next, each image is placed into the grid in sequence. The first image retains only the first frame of each grid, the next image retains only the next frame of each grid, and the last image retains only the last frame of each grid.

[0045] The specific process of step S3 is as follows: set the size of the image filled with straight raster lines in step S2 to 1000*1000 pixels, and set the vertical grid pixels to 100*1000 pixels. Then there are 10 grids in each image size range. If there are 5 images filled with straight raster lines in this group, then divide each grid into 5 frames evenly. Each frame is the same size, and each frame is 20*10000 pixels.

[0046] Next, each image is placed into the grid in sequence. The first image retains only the first frame of each grid, the second image retains only the second frame, the third image retains only the third frame, the fourth image retains only the fourth frame, and the fifth image retains only the fifth frame. At this point, each grid is filled with images.

[0047] It should be noted that the above filling method is only an example. The actual image processed may have tens of thousands or hundreds of thousands of pixels. During photolithography, the period of the linear grating is between 1 and 5 μm, the width of the cylindrical mirror in step S3 is between 30 and 100 μm, and the depth of the photolithographic structure is 2 to 3 μm.

[0048] S4. Establish a cylindrical lens matrix model and arrange it in an array in the vertical direction. The size of the array after arrangement is consistent with the size of the vertical grid in step S3. The three-dimensional structure of the cylindrical lens matrix model is as follows: Figure 7 As shown.

[0049] S5. Perform a first photolithography on the cylindrical lens matrix model, with a maximum exposure power of 100%. After the first photolithography, perform a second photolithography, with a maximum exposure power of 50%. This photolithography will roughly preserve the shape of the cylindrical lens, and will also include straight grating lines containing image information on the cylindrical lens. The 3D structure of the cylindrical lens matrix model after photolithography is shown below. Figure 8 (Front view) Figure 9 (Top view) Figure 10 As shown in the side view.

[0050] These cylindrical mirrors possess a grating pattern, and the direction of the grating lines reflects the brightness of different areas of the pattern. This dense micro / nano structure, under the diffraction of light, forms a pattern discernible to the human eye. Furthermore, the cylindrical mirror itself has a beam-splitting effect, and its inherent undulations control the image presentation. Figure 11 As shown, when the human eye is positioned above, the raster information at the position of the first image (P1) will be observed. As the viewing angle moves, the raster information at the positions of the second, third, fourth, and fifth images will be observed sequentially. Therefore, when we observe, the image information we see changes as the viewing angle moves, presenting a dynamic effect.

[0051] The holographic anti-counterfeiting film pattern produced by the embodiments of the present invention has a dynamic effect that is no less than that of the grating animation effect of the double-layer lens structure. Moreover, since its structure is single-layer, its process is no different from that of traditional holographic anti-counterfeiting film preparation, so it is very easy to achieve industrialization.

[0052] The present invention also provides a dynamic holographic anti-counterfeiting pattern generation system, comprising: an acquisition module, a region division and filling module, and an etching unit;

[0053] The acquisition module, region partitioning and filling module, and etching unit are communicatively connected. The acquisition module is used to acquire a set of continuously changing posture images and transmit the acquired continuously changing posture images to the region partitioning and filling module.

[0054] The region division and filling module is used to divide each image in the image into several regions according to different brightness values. Each region is filled with linear rasteres in different directions to obtain a cylindrical lens matrix model.

[0055] The etching unit performs optical etching on the cylindrical lens matrix model to create a dynamic holographic anti-counterfeiting pattern.

[0056] The present invention also provides a computer, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the dynamic holographic anti-counterfeiting pattern generation method described above.

[0057] The present invention also provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the aforementioned dynamic holographic anti-counterfeiting pattern generation method.

[0058] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media containing computer-usable program code (but not limited to phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory, or other optical, magnetic storage media, etc.).

[0059] The computer-readable storage medium provided in the above embodiments of this application and the method provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the applications stored therein.

[0060] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0061] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0062] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0063] The present invention is not limited to the description in the specification and embodiments, and thus other advantages and modifications can be readily realized by those skilled in the art. Therefore, the present invention is not limited to the specific details, representative devices and illustrated examples shown and described herein without departing from the spirit and scope of the general concept as defined by the claims and their equivalents.

Claims

1. A dynamic holographic anti-counterfeiting pattern generation method, characterized in that, It comprises the following steps: S1, preparing a set of pictures with continuously changing postures; S2, dividing each picture in the set of pictures prepared in step S1 into several regions according to different brightness values, and filling each region with linear gratings in different directions; S3, setting the size and vertical grid pixels of the set of pictures filled with linear gratings prepared in step S2 uniformly, and dividing each grid into the same number of frames as the number of pictures in the set of pictures filled with linear gratings, and the size of each frame is the same; Next, put each picture into the grid in turn, and only keep the first frame of each grid for the first picture, only keep the next frame of each grid for the next picture, and only keep the last frame of each grid for the last picture; S4, establishing a cylindrical lens matrix model and arranging the matrix in the vertical direction; S5, performing first photo-etching and second photo-etching on the cylindrical lens matrix model, and obtaining a dynamic holographic anti-counterfeiting pattern after photo-etching.

2. The dynamic holographic security pattern generation method of claim 1, wherein, Each region is filled with linear gratings in different directions.

3. The dynamic holographic security pattern generation method of claim 1, wherein, The width of the cylindrical lens is between 30-100um, the period of the linear grating is between 1-50um, and the photoetching structure depth is 2-3um.

4. The dynamic holographic security pattern generation method of claim 1, wherein, The size of the array after arrangement is consistent with the size of the vertical grid.

5. The dynamic holographic security pattern generation method of claim 1, wherein, The maximum exposure power of the first photo-etching is 100%, and the maximum exposure power of the second photo-etching is 50%.

6. A dynamic holographic security pattern generating system, which performs the dynamic holographic security pattern generating method according to any one of claims 1 to 5, characterized by It comprises: an acquisition module, a region division and filling module, and an etching unit; The acquisition module, the region division and filling module, and the etching unit are communicatively connected, the acquisition module is configured to acquire a set of pictures with continuously changing postures, and transmit the pictures with continuously changing postures to the region division and filling module, The region division and filling module is configured to divide each picture in the pictures into several regions according to different brightness values, fill each region with linear gratings in different directions, and establish a cylindrical lens matrix model, The etching unit performs photo-etching on the cylindrical lens matrix model to obtain a dynamic holographic anti-counterfeiting pattern.

7. A computer comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the dynamic holographic anti-counterfeiting pattern generation method of any one of claims 1-5.

8. A readable storage medium, having stored thereon a computer program, characterized in that, The program is executed by the processor to realize the dynamic holographic anti-counterfeiting pattern generation method of any one of claims 1-5.

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