Anti-counterfeiting graph generation method and printing method based on silk-screen printing and printed matter

Abstract

The invention relates to a printing, copying, marking or copying process, in particular to an anti-counterfeiting graph generation method and printing method based on screen printing and a printed matter. A first graph layer is manufactured according to target graph content; separating lines are arranged on the first printing layer to form a second pattern layer; the first graph layer is divided into a plurality of filling areas by the separation lines; performing texture filling on the plurality of filling areas to form a third layer, the texture filling of the adjacent filling areas having different angles; according to the first pattern layer, a fourth pattern layer is formed, and the fourth pattern layer is a synergistic printing layer. According to the embodiment of the invention, when the image is photographed or scanned during imitation, the internal texture can be refracted and part of light can be reflected through the three-dimensional transparent covering layer, so that the reversely obtained graph lacks part of content in the graph and the texture is distorted; and the method can be used for main patterns and characters of printed matters, and consumers can easily recognize the patterns and characters.

Description

TECHNICAL FIELD

[0001] The present application relates to a printing, copying, marking or copying process, in particular to a screen printing based anti-counterfeiting pattern generation method, a printing method and a printed matter. BACKGROUND

[0002] In the field of packaging printing, setting anti-counterfeiting marks on packaging is a common technical means for brand owners to identify genuine products. Generally, anti-counterfeiting marks usually include laser stickers or anti-counterfeiting printed marks. Laser stickers reflect different patterns by reflecting light at different angles to distinguish from ordinary stickers. Anti-counterfeiting printed marks use anti-counterfeiting ink to print specific marks, which will show hidden patterns under the irradiation of specific light sources, so as to avoid imitation by unscrupulous manufacturers. With the development of printing technology and ink technology, the technology and materials related to laser stickers and anti-counterfeiting ink are becoming increasingly popular. Some counterfeit packaging boxes also have imitated stickers or marks, and consumers cannot distinguish the difference with the naked eye, so it is necessary to further take supporting anti-counterfeiting measures to increase the difficulty of imitation and facilitate the identification and distinction of consumers. SUMMARY

[0003] In a first aspect, embodiments of the present application provide a screen printing based anti-counterfeiting pattern generation method to solve the problems of easy copying and inconvenient identification and distinction of existing anti-counterfeiting patterns.

[0004] The anti-counterfeiting pattern method includes the following steps: According to the target graphic content, a first layer is made; A separation line is set on the first layer to form a second layer; the separation line separates the first layer into a plurality of filled areas; The plurality of filled areas are filled with textures, and the texture filling of adjacent filled areas has different angles; According to the first layer, a fourth layer is formed, and the fourth layer is a synergistic printing layer.

[0005] Due to the use of the above method, the embodiments of the present application make the final printed pattern have a three-dimensional transparent cover layer covering the internal texture, which has a printing effect. When the image is photographed or scanned during imitation, the internal texture can be refracted and reflected by the three-dimensional transparent cover layer, so that the obtained pattern lacks part of the content in the pattern and the texture is distorted, and this method can be used for main patterns and texts of printed matters, which is easy for consumers to identify.

[0006] In a possible implementation, the first layer is made according to the target graphic content, which further includes: According to the target graphic content, a first pattern is generated; reading the contour line of the first pattern, vectorizing the contour line to obtain a vectorized contour line; performing one-time filling on the vectorized contour line.

[0007] In a possible implementation, the step of setting a separation line on the first layer to form a second layer further includes: setting a first outer node on the vectorized contour line; setting a first inner node in the vectorized contour line; connecting the first outer node and the first inner node to form the separation line.

[0008] In a possible implementation, the vertical distance from any point on the separation line to the adjacent two contour lines is equal.

[0009] In a possible implementation, the separation line is an explicit separation line or an implicit separation line.

[0010] In a possible implementation, the texture filling includes herringbone filling and / or dot matrix filling.

[0011] In a second aspect, embodiments of the present application also provide a printing method based on the above-mentioned first aspect, the printing method including: performing one-time screen printing on a printing carrier according to the first layer to obtain a one-time printed pattern showing a target graphic text background color; performing two-time screen printing on the printing carrier according to the second layer and the third layer to obtain a two-time printed pattern showing a target graphic text edge line and a separation line; performing synergistic printing on the printing carrier according to the fourth layer to obtain a three-time printed pattern with a transparent three-dimensional cover layer.

[0012] In a possible implementation, the step of performing two-time screen printing on the printing carrier according to the second layer and the third layer further includes: performing edge line printing on the one-time printed pattern according to the second layer; further performing texture line printing according to the third layer.

[0013] In a possible implementation, the step of performing two-time screen printing on the printing carrier according to the second layer and the third layer further includes: merging the second layer and the third layer to obtain a line layer; performing screen printing on the one-time printed pattern according to the line layer.

[0014] In a third aspect, embodiments of the present application provide a printed matter having a printed pattern, the printed pattern having a base color layer on a bottom layer, an edge line and a filling layer on the base color layer, and a synergistic transparent three-dimensional layer on a surface. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Flow chart of the first embodiment of the present application; Figure 2 Textual example chart of the first embodiment of the present application; Figure 3 Textual example chart of the second embodiment of the present application; Figure 4 Hidden separation line pattern example chart of the third embodiment of the present application; Figure 5 Actual presented pattern example chart of the third embodiment of the present application; Figure 6 Flow chart of the fourth example of the present application. DETAILED DESCRIPTION

[0016] The specific embodiments will now be described with reference to the drawings. These embodiments are described in order to explain the application to those skilled in the art. The embodiments do not limit the scope of the application. Based on the embodiments described below, those skilled in the art can obtain all other embodiments without creative effort, which are also within the scope of protection of the present application.

[0017] The embodiments disclosed provide many different embodiments or examples for implementing the various aspects, embodiments and examples of the present application. For purposes of explanation and ease of understanding, specific examples of components and arrangements are described. Of course, they are merely examples and are presented for purposes of illustration only. The intention is not to limit the application. Additionally, the embodiments can repeat reference numerals and / or letters in different examples and / or aspects of the present application. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or arrangements discussed.

[0018] In order to facilitate the understanding of the problems to be solved by the embodiments of the present application and the background and principles of the implementation of the technical solutions, a brief description of the technologies related to the embodiments is first provided.

[0019] The existing product packaging, such as the anti-counterfeiting on the packaging box of wine and cigarettes, is generally displayed by special range marks. Such marks are only in the local part and are not the theme pattern or character of the packaging. Moreover, such anti-counterfeiting marks need special processes or materials for printing.

[0020] Screen printing is a common printing method, when multi-color printing or superimposed multi-element printing is carried out, the complex pattern needs to be decomposed into multiple single-color layers during graphic processing, and then printed one by one. This method can realize color-rich, detailed design. The following is the detailed overall process and matters needing attention.

[0021] At the same time, screen printing can make the texture have a certain three-dimensional effect, which is usually called thick plate printing or three-dimensional printing. The ink layer used in ordinary screen printing is relatively thin. To achieve three-dimensional effect, special ink and specific printing control are used. High-density ink or three-dimensional paste is used to make it maintain a certain thickness after printing. During printing, the ink is accumulated on the screen of the screen, and is transferred to the printing material by the pressure of the squeegee, forming a relatively thick ink layer. After each printing, the ink layer is dried or preliminarily cured (such as by baking or ultraviolet curing), and then the next printing is carried out. The ink layer can be stacked one by one, and finally the three-dimensional height and profile are formed.

[0022] No matter what kind of screen printing method is adopted, the pattern to be printed and the plate making according to the pattern are important prerequisites for determining the screen printing process and also determine the final printing effect. The existing screen printing is generally used for printing the main elements such as background color, texture, pattern, character, etc. on the package. It is difficult to include anti-counterfeiting content in the printed content. Counterfeiters can easily obtain printed patterns by reverse graphic acquisition of the real object, and the counterfeiting is relatively simple.

[0023] In order to solve the above-mentioned basic principles and technical problems, the first embodiment of the present application provides a screen printing-based anti-counterfeiting pattern generation method, which is used to solve the problems that the existing anti-counterfeiting pattern is easy to copy and inconvenient to distinguish.

[0024] As shown in Figure 1 The anti-counterfeiting pattern method comprises the following steps: S11. According to the target graphic content, a first layer is made; S12. A separation line is arranged on the first printing layer to form a second layer; the separation line separates the first layer into a plurality of filling areas; S13. The plurality of filling areas are filled with textures to form a third layer, and the textures of adjacent filling areas have different angles; S14. According to the first layer, a fourth layer is formed, and the fourth layer is a synergistic printing layer.

[0025] As shown in Figure 2As shown, for example, by the character mark shown in the figure, in step S11, the first layer can be obtained by inputting the character, selecting a suitable font and size, and then performing graphical processing on the character.

[0026] In step S12, there are several different processing methods for the separation line. Due to the stroke characteristics of Chinese characters, independent graphic areas are formed between disconnected strokes, and connected graphic areas are formed between connected strokes. Therefore, the most basic separation line can be the edge line of the stroke. Therefore, it is necessary to first generate the contour line of each graphic area. The generation of the contour line can be manually operated or automatically generated by a computer. Manual operation is a manual outlining operation, which will not be described here. For computer-generated contour lines, the process mainly includes image preprocessing, edge detection, and contour rendering.

[0027] The purpose of image preprocessing is to convert the Chinese character graphics into a format that can be processed by a computer and prepare for subsequent edge detection. The first layer at this time is the file obtained after graphical processing, which can be a vector graph (such as SVG, AI format) or a bitmap (such as PNG, JPEG format). Convert the first layer to a grayscale image, which only contains brightness information. The value of each pixel represents its gray level, from 0 (pure black) to 255 (pure white). This step can eliminate the interference of color information on edge detection. In order to more clearly separate the Chinese characters and the background, further binarization processing is needed. By setting a threshold, all pixel gray values in the image are converted to only two values: 0 (black) and 255 (white), which makes the Chinese character part completely black and the background white.

[0028] Edge detection is a core step for identifying the contour line of the Chinese character graphics. For this purpose, an edge detection algorithm can be selected: there are many classic edge detection algorithms to choose from. Generally, one of the following algorithms can be selected for processing: Canny algorithm: This is a relatively common algorithm that can provide high-quality edges and is not sensitive to noise. It detects edges through multiple gradient values and uses non-maximum suppression and hysteresis thresholding to refine the edges.

[0029] Sobel operator and Prewitt operator: These two are gradient-based algorithms that find areas of sharp brightness changes, i.e., edges, by calculating the gradient of each pixel in the image. They are relatively simple but sensitive to noise.

[0030] After selecting the appropriate algorithm, apply it to the preprocessed first layer. The algorithm will output an edge map, in which all the contour lines of the Chinese characters are highlighted (usually white), and the rest is black.

[0031] Contour rendering is to convert the detected edges into the contour line effect you want. In graphics software, create a new, transparent layer, import the contour line, if the output contour line is vector data, you can directly specify the thickness and color of the path, and then perform the stroke rendering.

[0032] If the output contour line is a bitmap (i.e. edge map), use the map as a mask or selection, and then fill the area with the specified color.

[0033] In the separate strokes, or connected strokes as a separate graphic area, further fill the texture of each graphic area by step S13. Fill the texture of the plurality of filling areas to form a third layer, and the texture filling of adjacent filling areas has different angles; finally, superimpose the rendered contour line layer on the original Chinese character graphic layer, thus forming a Chinese character graphic with contour lines.

[0034] Then fill the texture of the plurality of filling areas by step S13 to form a third layer, and the texture filling of adjacent filling areas has different angles, and the texture filling includes stripe filling or dot array filling, so that the graphic interior presents a texture effect, and the texture effect of adjacent filling areas has different angles, which means that the extension direction of the stripe or dot array filling in the texture effect of adjacent filling areas is different. In fact, the texture effect of non-adjacent filling areas also has different angles, which is a better embodiment, aiming to avoid that the texture angle of a certain part can be used to infer the texture angle of other filling areas.

[0035] In fact, the texture effect can also be obtained by photographing, scanning, etc., and there is still a problem of easy imitation, so in step S14 in this embodiment, after printing the above layers, the graphic formed is further printed to form an efficiency printing layer. The efficiency printing layer specifically refers to a transparent efficiency layer formed by efficiency printing of resin ink or gloss oil material. The transparent efficiency layer generally forms a transparent three-dimensional effect on the surface of the graphic. In this embodiment, since the internal graphic has texture filling, after printing the transparent efficiency layer, an irregular lens effect is formed on the surface, which produces a refraction effect on the internal texture filling. In addition, the large and irregular curved surface at the edge also has a greater reflection effect on the light, so when copying by photographing, scanning, etc., first, the internal texture filling undergoes irregular refraction, forming an irregular texture effect in part, as shown at A in Figure 2 Secondly, the large curvature surface at the edge irregularly reflects the light, presenting an irregular reflection white spot in part, as shown at B in Figure 2The reflective white spot can shield the texture below, and the reflective area itself has an irregular shape, covering the texture and the edge part of the stroke. Therefore, when copying the pattern by photographing, scanning, etc., the local texture of the obtained pattern changes from the original pattern, and the local texture image cannot be normally displayed, greatly increasing the difficulty of copying.

[0036] By using the above method, the first embodiment of the present application fills the texture of the target graphic content and increases the printing effect, so that the final printed pattern is a printed effect with a three-dimensional transparent cover layer covering the internal texture. Especially at the irregular turning part of the edge, an irregular transmission effect is formed, and the transparent cover layer at different edge shapes has different and irregular curved surfaces. When copying by photographing or scanning the image, the internal texture is refracted and reflected by the three-dimensional transparent cover layer, so that the obtained pattern lacks part of the content in the pattern and the texture is distorted, which cannot be directly copied. Moreover, this method can be used for main patterns and texts of printed matter, which is easy for consumers to identify.

[0037] In step S12 of the above first embodiment, independent graphic areas are formed between disconnected strokes, so the most basic separation line can be the edge line of the stroke. Therefore, the contour line of each graphic area needs to be generated first. At this time, it is easy to form a larger filling area between connected strokes. When the larger filling area is filled with the same texture with the area edge as the boundary, the texture direction and density can be easily inferred according to the clearly displayed part during copying. In order to further solve this technical problem, a second embodiment is further proposed on the basis of the first embodiment. In the second embodiment, the separation line includes an edge line and an internal separation line, as shown by the line at position C in Figure 3 The internal separation line further divides the area surrounded by the edge line, and the internal separation line includes a middle line and a connecting line connecting the middle line and other vertices. The internal separation line can further divide the area surrounded by the edge line into multiple subareas, and the texture filling with different angles in each subarea can make the texture filling in each subarea have different extension directions. The intersection position of each edge line and internal separation line is further affected by the refraction and reflection of the surface transparent layer, further improving the difficulty of copying by directly obtaining the image.

[0038] The internal separation line can be manually drawn or generated by computer graphics analysis software. When generating the internal separation line, A first outer node is arranged on the vectorized contour line. A first inner node is arranged in the vectorized contour line. The first outer node and the first inner node are connected to form the separation line.

[0039] In order to avoid the generation of the separation line as a straight line connecting the first outer node and the first inner node, the trajectory of which is easy to imitate, in the embodiment, the vertical distance of a selected point on the separation line to the two adjacent contour lines is equal, the position of the selected point is defined by constraint, and then a plurality of selected points are connected to generate the separation line. When the contour line is an irregular line, the selected point is perpendicular to the tangent of the corresponding point on the contour line.

[0040] In computer graphics processing, there is another way of skeletonizing the graphics algorithm that can be applied to the generation of the separation line of the character graphics of the embodiment, which is achieved by iteratively removing the pixels of the image edge.

[0041] A new layer is created on the image of the underlying character and edge line, the layer is copied, and the copied layer is binarized. Generally, the pixel value of black is 0 and the pixel value of white is 255.

[0042] The skeletonization process is performed in two steps and repeated in a large loop until the image no longer changes.

[0043] First round of removal: remove the points at the lower left and upper right corners Traverse the image: start from the upper left corner and scan the binarized image pixel by pixel.

[0044] Check the pixel: for each foreground pixel point P1 (whose value is 1), check its 8 neighbor pixels (from P2 to P9) around it.

[0045] P9 P2 P3 P8 P1 P4 P7 P6 P5 Judge the removal condition: only when P1 meets the following four conditions at the same time, it will be marked as to be removed: Condition A: 2<=N(P1)<=6. N(P1) is the number of pixel points with a value of 1 among the 8 neighbors of P1. This condition ensures that isolated points or points on the intersection of the center line will not be removed.

[0046] Condition B: Z(P1)=1. Z(P1) is the number of jumps (changes) from 0 to 1 when traversing P2 to P9 in order. This condition ensures that only the points on the stroke edge are removed.

[0047] Condition C: P2xP4xP6=0.

[0048] Condition D: P4xP6xP8=0.

[0049] Conditions C and D are used to prevent the skeleton from breaking during the removal process and ensure that only the points at the corners are removed.

[0050] Mark for removal: If P1 meets all four conditions, record its coordinates in a list, but do not change its value yet.

[0051] Uniform removal: After one image traversal, change the value of all pixels marked for removal from 1 to 0.

[0052] Second round of removal: Remove the top-left and bottom-right corner points This round of removal is similar to the first round of removal, except that two conditions are changed: Traverse the image: Traverse the entire image again.

[0053] Check the pixel: For each foreground pixel point P1, check its 8 neighbor pixels.

[0054] Judge removal conditions: Only when P1 meets the following four conditions at the same time, mark it for removal: Condition A: 2 <= N(P1) <= 6 (same as the first round).

[0055] Condition B: Z(P1) = 1 (same as the first round).

[0056] Condition C: P2 x P4 x P8 = 0 (different from the first round).

[0057] Condition D: P2 x P6 x P8 = 0 (different from the first round).

[0058] Mark for removal: Record all points that meet the conditions.

[0059] Uniform removal: After traversal, change the value of all marked points from 1 to 0.

[0060] Repeat the above first round of removal and second round of removal until after a complete two-round removal operation, there is no pixel point that can be removed. When this condition is met, the loop terminates. The remaining foreground pixel points (value 1) are the skeleton or center line of the Chinese character strokes.

[0061] In this way, the pixels on the periphery are peeled off layer by layer until only the most core skeleton is left.

[0062] After obtaining the skeleton, vectorization processing can be performed, and then the line width and coloring can be changed to make it have the same color as the edge line.

[0063] As Figure 3In the glyph area, the above-mentioned skeletonization algorithm can reduce the strokes of graphical text by deleting edge pixels, called a line located at the center of the stroke. By connecting the endpoints of the line and the specified points on the edge line, the area within one or more strokes can be further subdivided into multiple irregular small areas, and then filled with textures at different angles to obtain a more complex line effect.

[0064] Since the contour lines at the ends of some strokes, such as the strokes of the left-falling and right-falling strokes, have an endpoint at the top, as Figure 3 in the "human" glyph area, the dividing line can directly extend to this endpoint without secondary connection. According to the above-mentioned skeletonization algorithm, the stroke will become shorter and cannot extend to this end endpoint. At this time, it can be realized based on the skeletonization calculation of the distance transform. This algorithm calculates the distance from each pixel inside the stroke to the nearest background (or contour) pixel. The higher this distance value, the closer the pixel is to the center of the stroke. Specifically, it includes: Finding local maxima: In the result of the distance transform, find all pixel points with the largest local distance values. These points are the "spinal points" of the stroke.

[0065] Connecting the "spinal points": Connecting these local maximum points forms the center line of the stroke.

[0066] The above first embodiment and second embodiment provide an image generation method based on text graphics. In the above two embodiments, the dividing line is a visible dividing line, that is, a physical line finally presented on the image. By setting the edge line and the dividing line, the content expression of the text graphics is not affected. However, if the graphic itself is a graphic content expressed by lines, then adding an edge line or a dividing line in this graphic will affect the performance of the original lines. Therefore, in the third embodiment, as Figure 4 and Figure 5 shown in the graphic of the character's clothing line, Figure 4 the dotted line in it is the dividing line, but presenting this dividing line will affect the complete performance of the graphic. Therefore, this dividing line is an invisible dividing line, which is only used for the function of dividing the filling area and is different from the final presentation. For a graphic with lines inside, using the existing lines and invisible dividing lines to divide the filling area can better avoid obvious marks on the dividing boundaries of filling textures at different angles and avoid generating regular dividing features, which can better prevent reverse imitation.

[0067] The fourth embodiment of the present invention also provides a printing method, which is used to print the graphics generated by the anti-counterfeiting graphic generation method based on screen printing in the above first embodiment to the third embodiment. The printing method includes: S21. According to the first layer, a first screen printing is performed on the printing carrier to obtain a first printed pattern showing the background color of the target graphics and texts; S22. According to the second layer and the third layer, a second screen printing is performed on the printing carrier to obtain a second printed pattern showing the edge lines and the separation lines of the target graphics and texts; S23. According to the fourth layer, a synergistic printing is performed on the printing carrier to obtain a third printed pattern having a transparent stereoscopic cover layer.

[0068] In the embodiment, the second screen printing according to the second layer and the third layer further comprises: performing edge line printing on the first printed pattern according to the second layer; further performing texture line printing according to the third layer.

[0069] Preferably, in the embodiment, the second screen printing according to the second layer and the third layer further comprises: combining the second layer and the third layer to obtain a line layer; performing screen printing on the first printed pattern according to the line layer.

[0070] An embodiment of the present application also provides a printed matter, which has a printed pattern on the printing surface, the printed pattern having a background layer located at the bottom layer, an edge line and a filling layer located on the background layer, and a synergistic transparent stereoscopic layer located on the surface. The synergistic transparent stereoscopic layer performs light reflection on the filling layer to shield or bend the edge line and the filling layer when being inversely photographed or scanned.

[0071] The above only describes the preferred embodiments of the present application, and does not limit the disclosure range of the embodiments of the present application. Any equivalent structure or equivalent flow transformation, or direct or indirect application in other related technical fields, which is made by using the content of the specification and drawings of the embodiments of the present application, is also included in the patent protection range supported by the embodiments of the present application.

Claims

1. A method for generating anti-counterfeiting graphics based on screen printing, characterized in that, Includes the following steps: Create the first layer based on the target text and image content; A dividing line is set on the first layer to form a second layer; the dividing line divides the first layer into multiple filled areas. Texture filling is applied to the multiple filling areas to form a third layer, wherein the texture filling of adjacent filling areas has different angles; Based on the first layer, a fourth layer is formed, wherein the fourth layer is an enhancement printing layer.

2. The method for generating anti-counterfeiting graphics based on screen printing as described in claim 1, characterized in that, The step of creating the first layer based on the target graphic content further includes: Generate a first graphic based on the target graphic content; Read the outline of the first graphic, perform vectorization processing on the outline, and obtain the vectorized outline; The vectorized outline is filled once to form the first layer.

3. The method for generating anti-counterfeiting graphics based on screen printing as described in claim 2, characterized in that, The step of setting a separator line on the first layer to form a second layer further includes: A first outer node is set on the vectorized contour line; A first inner node is set within the vectorized contour line; Connect the first outer node and the first inner node to form the separator line.

4. The method for generating anti-counterfeiting graphics based on screen printing as described in claim 3, characterized in that, The perpendicular distance from any point on the dividing line to the two adjacent contour lines is equal.

5. The method for generating anti-counterfeiting graphics based on screen printing as described in claim 3 or 4, characterized in that, The dividing line can be a visible dividing line or a hidden dividing line.

6. The method for generating anti-counterfeiting graphics based on screen printing as described in claim 1, characterized in that, The texture filling includes twill filling and / or dot matrix filling.

7. A printing method based on the anti-counterfeiting graphic generation method according to any one of claims 1-6, characterized in that, include: Based on the first layer, a screen printing is performed on the printing carrier to obtain a printed graphic that displays the background color of the target image. Based on the second and third layers, a second screen printing is performed on the printing carrier to obtain a second printed graphic that displays the edge lines and dividing lines of the target graphic. Based on the fourth layer, enhanced printing is performed on the printing carrier to obtain a three-dimensional printed pattern with a transparent three-dimensional overlay.

8. The printing method as described in claim 7, characterized in that, Based on the second and third layers, secondary screen printing on the printing substrate further includes: Based on the second layer, edge lines are printed on the first printing pattern; Based on the third layer, further texture line printing is performed.

9. The printing method as described in claim 7, characterized in that, Based on the second and third layers, secondary screen printing on the printing substrate further includes: Merge the second and third layers to obtain a line layer; Based on the line layer, screen printing is performed on a single print pattern.

10. A printed matter having a printed graphic, characterized in that, The printed pattern has a base color layer at the bottom, an edge line and a fill layer on the base color layer, and an enhanced transparent three-dimensional layer on the surface.

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