Screen printing explosion early warning method and device, computer equipment and storage medium

Abstract

The application discloses a printing screen burst early warning method and device, computer equipment and a storage medium, and relates to the technical field of automation. The method comprises the following steps: photographing a printing screen by using an industrial camera to obtain a current screen image; determining whether the contour edge of the current screen image changes based on the screen mesh offset information corresponding to the current screen image, and determining whether the current screen image has an abnormal gray scale change area according to the current gray scale information corresponding to the current screen image; if the contour edge of the current screen image changes and the current screen image has an abnormal gray scale change area, generating printing screen burst early warning information according to the gray scale information. In this way, the screen mesh offset information and the current gray scale information of the current screen image are analyzed and processed in real time, and once it is detected that the contour edge changes and there is an abnormal gray scale change area, printing screen burst early warning information is immediately generated.

Description

Technical Field

[0001] This invention relates to the field of automation technology, and in particular to a method, apparatus, computer equipment, and storage medium for early warning of printing screen printing plate bursts. Background Technology

[0002] In photovoltaic manufacturing, the printing process uses screen printing plates to print on solar cells. As the number of printing passes increases, problems such as low efficiency, ink leakage, and plate bursting can occur. Among these, plate bursting is particularly serious, causing a large amount of ink to spill out of the screen, increasing ink waste and production costs. Currently, screen management relies on manual experience to determine whether a screen needs to be taken offline, a method that makes it difficult to remove screens from production while ensuring they reach their maximum lifespan. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide a method, device, computer equipment and storage medium for early warning of screen printing plate bursting, which is used to predict the risk of screen printing plate bursting in advance by real-time monitoring of the screen printing plate status, while ensuring that the screen printing plate reaches its maximum service life, and to provide timely warning, thereby reducing slurry loss and improving production efficiency and economic benefits.

[0004] This invention provides the following technical solution: In a first aspect, the present invention proposes a method for early warning of printing screen overprinting, comprising: An image of the printing screen is obtained by photographing the screen using an industrial camera; Based on the mesh offset information corresponding to the current screen printing image, it is determined whether the outline edge of the current screen printing image has changed, and based on the current grayscale information corresponding to the current screen printing image, it is determined whether there are abnormal grayscale change areas in the current screen printing image; If the outline edge of the current screen printing image changes and there is an area of ​​abnormal grayscale change in the current screen printing image, then a screen printing overprint warning message is generated based on the grayscale information.

[0005] In one embodiment, determining whether the contour edge of the current screen printing image has changed based on the mesh offset information corresponding to the current screen printing image includes: The mesh offset information is calculated based on the current mesh position corresponding to the current screen image and the initial mesh position of the printing screen. Determine whether the mesh on the printing screen is offset based on the mesh offset information; If the mesh shifts, the outline edge of the current screen image changes; If the mesh is not offset, the outline edge of the current screen image remains unchanged.

[0006] In one embodiment, determining whether the mesh on the printing screen is offset based on the mesh offset information includes: Determine whether the mesh offset information is greater than a preset offset threshold; If the mesh offset information is greater than the preset offset threshold, then the mesh offset; If the mesh offset information is less than or equal to the preset offset threshold, then the mesh is not offset.

[0007] In one embodiment, determining whether there are abnormal grayscale change regions in the current screen printing image based on the current grayscale information corresponding to the current screen printing image includes: Perform grayscale analysis on the current screen image to obtain the current grayscale information; The grayscale difference value corresponding to each pixel is calculated based on the current grayscale information and the initial grayscale reference information of the printing screen. Based on the grayscale differences, determine whether there are areas of abnormal grayscale variation in the current screen image.

[0008] In one embodiment, determining whether there are abnormal grayscale change regions in the current screen print image based on each of the grayscale differences includes: Determine whether each grayscale difference is within a preset difference threshold range; If the grayscale difference is within the preset difference threshold range, then the pixel corresponding to the grayscale difference is an abnormal pixel. If the grayscale difference is not within the preset difference threshold range, then the pixel corresponding to the grayscale difference is a normal pixel. Perform region clustering analysis on the abnormal pixels to obtain candidate abnormal regions; Determine whether the area of ​​the candidate abnormal region is greater than a preset area threshold; If the area of ​​the candidate abnormal region is greater than a preset area threshold, then the current halftone image has an abnormal grayscale change region. If the area of ​​the candidate abnormal region is less than or equal to a preset area threshold, then the current screen image does not have any abnormal grayscale change areas.

[0009] In one embodiment, generating printing screen overprint warning information based on the grayscale information includes: Determine whether the grayscale value in the grayscale information is greater than a preset shutdown grayscale threshold; If the grayscale value in the grayscale information is greater than the preset shutdown grayscale threshold, then the printing screen overprint warning information is generated based on the shutdown command.

[0010] In one embodiment, after determining whether the grayscale value in the grayscale information is greater than a preset shutdown grayscale threshold, the method further includes: If the grayscale value in the grayscale information is less than or equal to the preset stop grayscale threshold, then multiple feature points are extracted from the initial screen image corresponding to the printing screen as reference feature points according to the preset features. Multiple real-time feature points are extracted from the current screen image based on each of the aforementioned reference feature points; Based on the feature matching algorithm, each of the aforementioned baseline feature points and each of the aforementioned real-time feature points are matched to obtain successfully matched valid feature point pairs; The overlap ratio is calculated based on the number of effective feature point pairs and the number of reference feature points; The printing screen overprint warning information is generated based on the overlap degree.

[0011] Secondly, the present invention proposes a printing screen printing plate bursting early warning device, comprising: The imaging module is used to capture images of the printing screen using an industrial camera to obtain the current image of the screen. The judgment module is used to determine whether the outline edge of the current screen image has changed based on the mesh offset information corresponding to the current screen image, and to determine whether there is an abnormal grayscale change area in the current screen image based on the current grayscale information corresponding to the current screen image. The early warning module is used to generate printing screen overprint warning information based on the grayscale information if the outline edge of the current screen image changes and there is an abnormal grayscale change area in the current screen image.

[0012] Thirdly, the present invention proposes a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, it implements the printing screen overprint warning method as described in the first aspect.

[0013] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the printing screen overprint warning method as described in the first aspect.

[0014] This invention discloses a printing screen bursting warning method, device, computer equipment, and storage medium. It uses an industrial camera to capture an image of the printing screen, obtaining the current screen image. Based on the mesh offset information corresponding to the current screen image, it determines whether the outline edge of the current screen image has changed, and based on the current grayscale information corresponding to the current screen image, it determines whether there are abnormal grayscale change areas in the current screen image. If the outline edge of the current screen image changes and there are abnormal grayscale change areas, a printing screen bursting warning is generated based on the grayscale information. In this way, the industrial camera can capture images of the printing screen in real time. The system can quickly analyze and process the mesh offset information and current grayscale information in the image. Once a change in the outline edge and the presence of abnormal grayscale change areas are detected, a printing screen bursting warning is immediately generated. This real-time monitoring and rapid response mechanism can issue timely alarms before a bursting incident occurs, buying valuable processing time for operators and avoiding production interruptions and equipment damage caused by bursting. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly described 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 of protection of the present invention. In the various drawings, similar components are numbered similarly.

[0016] Figure 1 A flowchart of the printing screen overprint warning method proposed in this embodiment is shown; Figure 2 Another flowchart of the printing screen overprint warning method proposed in this embodiment is shown; Figure 3 This illustration shows another flowchart of the printing screen overprint warning method proposed in this embodiment; Figure 4 A schematic diagram of the printing screen overprint warning device proposed in this embodiment is shown.

[0017] Explanation of reference numerals in the attached figures: 400 - Printing screen printing plate explosion warning device; 401 - Imaging module; 402 - Judgment module; 403 - Warning module. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] The components of the embodiments of the invention described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] In the following, the terms “comprising,” “having,” and their cognates, which may be used in various embodiments of the invention, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as excluding, firstly, the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations thereof.

[0021] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0022] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the invention pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of the invention.

[0023] Example 1 This disclosure provides a method for early warning of screen breakage in printing, which uses real-time monitoring of the screen status to predict the risk of screen breakage in advance while ensuring that the screen reaches its maximum service life, thereby reducing slurry loss and improving production efficiency and economic benefits.

[0024] Please see Figure 1 The printing screen overprint warning method includes steps S101 to S103, and each step is described in detail below.

[0025] Step S101: Take a picture of the printing screen using an industrial camera to obtain the current screen image.

[0026] In this embodiment, the vision module of an industrial camera is used to capture images of various positions on the initial printing screen to obtain an initial screen image. During subsequent use, the current screen image is captured in real time at various positions on the printing screen, so that the initial screen image and the initial screen image can be used to determine whether the printing screen needs a burst warning.

[0027] Step S102: Based on the mesh offset information corresponding to the current screen printing image, determine whether the contour edge of the current screen printing image has changed, and based on the current grayscale information corresponding to the current screen printing image, determine whether there is an abnormal grayscale change area in the current screen printing image.

[0028] In this embodiment, the contour edge of the current screen image is determined based on the mesh offset information corresponding to the current screen image. This can provide an early warning of mesh tension relaxation or frame deformation, avoiding misregistration caused by structural deformation of the screen. At the same time, if the mesh position changes, the corresponding gray value will definitely change. Therefore, the current gray value information corresponding to the current screen image is used to determine whether there are areas of abnormal gray value change in the current screen image.

[0029] Please see Figure 2 In one specific embodiment, step S102 includes steps S201 to S204, and each step is described in detail below.

[0030] Step S201: Calculate the mesh offset information based on the current mesh position corresponding to the current screen image and the initial mesh position of the printing screen.

[0031] In this embodiment, the mesh offset information is calculated based on the current mesh position corresponding to the current screen image and the initial mesh position of the printing screen. Generally, the position offset at the positioning point is used as the mesh offset information. The initial mesh position is obtained from the initial screen image.

[0032] Step S202: Determine whether the mesh on the printing screen is offset based on the mesh offset information.

[0033] In this embodiment, the offset information is used to further determine whether the mesh on the printing screen is offset, thereby reducing misjudgments.

[0034] In one specific embodiment, step S202 includes: determining whether the mesh offset information is greater than a preset offset threshold; if the mesh offset information is greater than the preset offset threshold, then the mesh is offset; if the mesh offset information is less than or equal to the preset offset threshold, then the mesh is not offset.

[0035] In this embodiment, it is determined whether the mesh offset information is greater than a preset offset threshold. If the mesh offset information is greater than the preset offset threshold, the mesh offset can be determined. If the mesh offset information is less than or equal to the preset offset threshold, it can be known that the mesh has not been offset, thus eliminating false detection.

[0036] Step S203: If the mesh is offset, the outline edge of the current screen image changes.

[0037] In this embodiment, the mesh is an elastic body taut on the frame, and any local offset must be transmitted to the edge through the warp and weft threads. Therefore, if the mesh shifts, it indicates that the outline edge of the current screen image has changed.

[0038] Step S204: If the mesh is not offset, the outline edge of the current screen image remains unchanged.

[0039] In this embodiment, if the mesh is not shifted and the screen tension is balanced, it can be known that the outline edge of the current screen image has not changed and the edge nodes have no displacement.

[0040] Please see Figure 3 In one specific embodiment, step S102 includes steps S301 to S303, and each step is described in detail below.

[0041] Step S301: Perform grayscale analysis on the current halftone image to obtain the current grayscale information.

[0042] In this embodiment, grayscale analysis is performed on the current halftone image to obtain the current grayscale image, and the current grayscale image is used as the current grayscale information.

[0043] Step S302: Calculate the grayscale difference value corresponding to each pixel point based on the current grayscale information and the initial grayscale reference information of the printing screen.

[0044] In this embodiment, the current grayscale information is compared pixel by pixel with the initial grayscale reference information, and the difference between the current grayscale value and the initial grayscale reference value for each pixel is calculated as the grayscale difference. The initial grayscale reference information is obtained from the initial halftone image.

[0045] Step S303: Determine whether there are abnormal grayscale change areas in the current screen image based on the grayscale differences.

[0046] In this embodiment, the presence of abnormal grayscale change areas in the current screen printing image is determined based on the various grayscale differences, thereby effectively determining whether a screen printing overload warning is needed by combining the screen printing outline edge.

[0047] In one specific embodiment, step S303 includes: determining whether each of the grayscale differences is within a preset difference threshold range; if the grayscale difference is within the preset difference threshold range, the pixel corresponding to the grayscale difference is an abnormal pixel; if the grayscale difference is not within the preset difference threshold range, the pixel corresponding to the grayscale difference is a normal pixel; performing region clustering analysis on the abnormal pixels to obtain candidate abnormal regions; determining whether the area of ​​the candidate abnormal region is greater than a preset area threshold; if the area of ​​the candidate abnormal region is greater than the preset area threshold, the current screen image has an abnormal grayscale change region; if the area of ​​the candidate abnormal region is less than or equal to the preset area threshold, the current screen image does not have an abnormal grayscale change region.

[0048] In this embodiment, it is determined whether each grayscale difference is within a preset difference threshold range. If the grayscale difference is within the preset difference threshold range, the pixel corresponding to that grayscale difference is an abnormal pixel; if the grayscale difference is not within the preset difference threshold range, the pixel corresponding to that grayscale difference is a normal pixel. By comparing each grayscale difference with the preset difference threshold range, pixels whose grayscale changes exceed the normal range can be accurately filtered out and identified as abnormal pixels. This judgment method based on quantitative indicators avoids the uncertainty and error of subjective judgment, and improves the accuracy and reliability of abnormal pixel identification. For example, in screen printing images, local grayscale abnormal changes caused by printing defects or dust can be accurately captured.

[0049] Regional clustering analysis is performed on anomalous pixels to obtain candidate anomalous regions. This analysis integrates scattered anomalous pixels into connected candidate anomalous regions, helping to grasp the overall anomaly and avoid misclassifying isolated, meaningless anomalous pixels as anomalous regions. For example, in screen printing images, there may be some scattered anomalous pixels caused by noise interference; regional clustering analysis can eliminate these, while extracting continuous anomalous regions truly caused by printing problems.

[0050] The system determines whether the area of ​​a candidate abnormal region exceeds a preset area threshold. If the area exceeds the threshold, the current screen printing image contains an area of ​​abnormal grayscale variation; if the area is less than or equal to the threshold, the image does not contain such an area. By determining whether the area of ​​a candidate abnormal region exceeds the threshold, the system further filters out abnormalities, considering the actual size of the abnormal region and eliminating those that are too small or potentially meaningless. For example, in a screen printing image, some minor, accidental grayscale changes may not have a substantial impact on printing quality. By setting an area threshold, these situations can be avoided from being misclassified as abnormal grayscale variation areas, improving the accuracy and practicality of the detection results.

[0051] It should be noted that the preset difference threshold range can be ±10, which can be adjusted according to parameters such as screen material and paste type; the clustering analysis method can be the connected component labeling algorithm; the preset area threshold can be 30㎡, which can be determined according to the screen size and printing precision.

[0052] Step S103: If the outline edge of the current screen image changes and there is an abnormal grayscale change area in the current screen image, then a printing screen overprint warning information is generated based on the grayscale information.

[0053] In this embodiment, if the outline edge of the current screen printing image changes and there are areas of abnormal grayscale variation in the current screen printing image, a screen printing overprint warning is generated based on the grayscale information. The change in the outline edge may indicate physical damage or deformation of the screen printing structure, such as changes in edge shape caused by local stretching or tearing of the screen; while areas of abnormal grayscale variation may reflect problems affecting printing quality, such as ink accumulation, clogging, or mesh damage in the screen printing area. Combining these two features for judgment avoids misjudgments that may occur when relying on only a single feature, greatly improving the accuracy of the overprint warning.

[0054] In one specific embodiment, step S103 includes: determining whether the grayscale value in the grayscale information is greater than a preset shutdown grayscale threshold; if the grayscale value in the grayscale information is greater than the preset shutdown grayscale threshold, then generating the printing screen overprint warning information based on the shutdown command.

[0055] In this embodiment, it is determined whether the grayscale value in the grayscale information is greater than the preset shutdown grayscale threshold. If the grayscale value in the grayscale information is greater than the preset shutdown grayscale threshold, it can be known that the current risk level of the printing screen is level one risk. Based on the shutdown command, a printing screen overprint warning information is generated, and the machine is automatically shut down and alarmed according to the printing screen overprint warning information.

[0056] In one specific embodiment, after determining whether the grayscale value in the grayscale information is greater than a preset shutdown grayscale threshold, the method further includes: if the grayscale value in the grayscale information is less than or equal to the preset shutdown grayscale threshold, then extracting multiple feature points from the initial screen image corresponding to the printing screen as reference feature points according to preset features; extracting multiple real-time feature points from the current screen image according to each reference feature point; matching each reference feature point and each real-time feature point based on a feature matching algorithm to obtain successfully matched valid feature point pairs; calculating the overlap degree based on the number of valid feature point pairs and the number of reference feature points; and generating the printing screen overload warning information based on the overlap degree.

[0057] In this embodiment, if the grayscale value in the grayscale information is less than or equal to a preset stop grayscale threshold, multiple feature points are extracted from the initial screen image corresponding to the printing screen as reference feature points according to preset features. The preset features can be unique and stable features (such as screen edge corners, line intersections, specific pattern markings, etc.).

[0058] Multiple real-time feature points are extracted from the current screen printing image based on each reference feature point; each reference feature point and each real-time feature point are matched based on a feature matching algorithm to obtain successfully matched valid feature point pairs; the percentage of the quotient of the number of valid feature point pairs and the reference feature points is used as the overlap degree; and printing screen printing overprint warning information is generated based on the overlap degree.

[0059] For example, when the overlap is 100%, the risk level of the screen printing plate is level four, which is low. Based on the monitoring instructions, a screen printing plate overprint warning is generated. At this time, the equipment is continuously monitored according to the screen printing plate overprint warning information, and no warning is required.

[0060] When the overlap is 80%, the risk level of the screen printing plate is level three, which is relatively low. Based on the mild warning instruction, a screen printing plate overprint warning message is generated. At this time, the equipment is controlled to continue production according to the screen printing plate overprint warning message, and a mild warning signal is issued.

[0061] When the overlap is 60%, the risk level of the screen printing plate is level 2, which is medium risk. Based on the medium warning instruction, a screen printing plate overprint warning message is generated. At this time, a medium warning signal is issued based on the screen printing plate overprint warning message. Manual confirmation is required to stop the machine.

[0062] When the overlap is 40%, the risk level of the screen printing plate is Level 1, which is medium risk. Based on the medium warning instruction, a screen printing plate overprint warning message is generated. At this time, the machine will automatically stop and issue a warning based on the screen printing plate overprint warning message.

[0063] It should be noted that the audible and visual alarm unit consists of LED warning lights and a buzzer. When a warning message about a printing plate overprint is received, the LED lights will flash according to the color of the signal light corresponding to the different warning messages, and at the same time, the buzzer will sound an alarm.

[0064] In addition, the system transmits printing screen overprint warnings to the workshop monitoring center's management system in real time. The transmitted information includes key details such as the screen number, warning time, risk type, and risk level. Managers can use this platform to quickly locate the problematic screen and take timely countermeasures, such as assigning staff to inspect or replace it.

[0065] The printing screen bursting warning method proposed in this embodiment uses an industrial camera to capture an image of the printing screen. Based on the mesh offset information corresponding to the current screen image, it determines whether the outline edge of the current screen image has changed, and based on the current grayscale information corresponding to the current screen image, it determines whether there are abnormal grayscale change areas in the current screen image. If the outline edge of the current screen image changes and there are abnormal grayscale change areas, a printing screen bursting warning is generated based on the grayscale information. In this way, the industrial camera can capture images of the printing screen in real time. The system can quickly analyze and process the mesh offset information and current grayscale information in the image. Once a change in the outline edge and the presence of abnormal grayscale change areas are detected, a printing screen bursting warning is immediately generated. This real-time monitoring and rapid response mechanism can issue an alarm in time before a bursting incident occurs, buying valuable processing time for operators and avoiding production interruptions and equipment damage caused by bursting.

[0066] Example 2 Furthermore, this disclosure provides a printing screen printing plate burst warning device 400, please refer to [link to relevant documentation]. Figure 4 ,include: The imaging module 401 is used to capture images of the printing screen using an industrial camera to obtain the current screen image; The judgment module 402 is used to determine whether the contour edge of the current screen image has changed based on the mesh offset information corresponding to the current screen image, and to determine whether there is an abnormal grayscale change area in the current screen image based on the current grayscale information corresponding to the current screen image. The early warning module 403 is used to generate printing screen overprint warning information based on the grayscale information if the outline edge of the current screen image changes and there is an abnormal grayscale change area in the current screen image.

[0067] Optionally, the judgment module 402 is further configured to calculate the mesh offset information based on the current mesh position corresponding to the current screen image and the initial mesh position of the printing screen; determine whether the mesh on the printing screen is offset based on the mesh offset information; if the mesh is offset, the outline edge of the current screen image changes; if the mesh is not offset, the outline edge of the current screen image does not change.

[0068] Optionally, the judgment module 402 is further configured to determine whether the mesh offset information is greater than a preset offset threshold; if the mesh offset information is greater than the preset offset threshold, then the mesh is offset; if the mesh offset information is less than or equal to the preset offset threshold, then the mesh is not offset.

[0069] Optionally, the judgment module 402 is further configured to perform grayscale analysis on the current screen image to obtain the current grayscale information; calculate the grayscale difference value corresponding to each pixel point based on the current grayscale information and the initial grayscale reference information of the printing screen; and determine whether there are abnormal grayscale change areas in the current screen image based on each grayscale difference value.

[0070] Optionally, the judgment module 402 is further configured to determine whether each of the grayscale differences is within a preset difference threshold range; if the grayscale difference is within the preset difference threshold range, the pixel corresponding to the grayscale difference is an abnormal pixel; if the grayscale difference is not within the preset difference threshold range, the pixel corresponding to the grayscale difference is a normal pixel; perform region clustering analysis on the abnormal pixels to obtain candidate abnormal regions; determine whether the area of ​​the candidate abnormal region is greater than a preset area threshold; if the area of ​​the candidate abnormal region is greater than the preset area threshold, the current screen image has an abnormal grayscale change region; if the area of ​​the candidate abnormal region is less than or equal to the preset area threshold, the current screen image does not have an abnormal grayscale change region.

[0071] Optionally, the early warning module 403 is also used to determine whether the gray value in the gray information is greater than a preset shutdown gray value threshold; if the gray value in the gray information is greater than the preset shutdown gray value threshold, then the printing screen overprint warning information is generated based on the shutdown command.

[0072] Optionally, the early warning module 403 is further configured to: if the grayscale value in the grayscale information is less than or equal to the preset shutdown grayscale threshold, extract multiple feature points from the initial screen image corresponding to the printing screen as reference feature points according to preset features; extract multiple real-time feature points from the current screen image according to each reference feature point; match each reference feature point and each real-time feature point based on a feature matching algorithm to obtain successfully matched valid feature point pairs; calculate the overlap degree according to the number of valid feature point pairs and the number of reference feature points; and generate the printing screen overload early warning information according to the overlap degree.

[0073] The apparatus provided in this embodiment can execute the steps of the printing screen overprint warning method provided in Embodiment 1. To avoid repetition, the steps will not be repeated.

[0074] The screen printing plate bursting early warning device proposed in this embodiment uses an industrial camera to capture images of the printing screen, obtaining the current screen image. Based on the mesh offset information corresponding to the current screen image, it determines whether the outline edge of the current screen image has changed, and based on the current grayscale information corresponding to the current screen image, it determines whether there are abnormal grayscale change areas in the current screen image. If the outline edge of the current screen image changes and there are abnormal grayscale change areas, then a screen printing plate bursting early warning message is generated based on the grayscale information. In this way, the industrial camera can capture images of the printing screen in real time. The system can quickly analyze and process the mesh offset information and current grayscale information in the image. Once a change in the outline edge and the presence of abnormal grayscale change areas are detected, a screen printing plate bursting early warning message is immediately generated. This real-time monitoring and rapid response mechanism can issue timely alarms before a bursting incident occurs, buying valuable processing time for operators and avoiding production interruptions and equipment damage caused by bursting.

[0075] Example 3 Furthermore, this disclosure provides a computer device including a memory and a processor. The memory stores a computer program, which, when executed by the processor, implements the printing screen overprint warning method described in Embodiment 1.

[0076] The device provided in this embodiment can execute the steps of the printing screen overprint warning method provided in Embodiment 1. To avoid repetition, the steps will not be repeated.

[0077] Example 4 This disclosure provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the printing screen overprint warning method described in Embodiment 1.

[0078] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0079] The computer-readable storage medium provided in this embodiment can implement the printing screen overprint warning method provided in Embodiment 1. To avoid repetition, it will not be described again here.

[0080] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0081] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0082] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for early warning of printing screen overprinting, characterized in that, include: An image of the printing screen is obtained by photographing the screen using an industrial camera; Based on the mesh offset information corresponding to the current screen printing image, it is determined whether the outline edge of the current screen printing image has changed, and based on the current grayscale information corresponding to the current screen printing image, it is determined whether there are abnormal grayscale change areas in the current screen printing image; If the outline edge of the current screen printing image changes and there is an area of ​​abnormal grayscale change in the current screen printing image, then a screen printing overprint warning message is generated based on the grayscale information.

2. The printing screen overprint warning method according to claim 1, characterized in that, The step of determining whether the contour edge of the current screen printing image has changed based on the mesh offset information corresponding to the current screen printing image includes: The mesh offset information is calculated based on the current mesh position corresponding to the current screen image and the initial mesh position of the printing screen. Determine whether the mesh on the printing screen is offset based on the mesh offset information; If the mesh shifts, the outline edge of the current screen image changes; If the mesh is not offset, the outline edge of the current screen image remains unchanged.

3. The printing screen overprint warning method according to claim 2, characterized in that, The step of determining whether the mesh on the printing screen is offset based on the mesh offset information includes: Determine whether the mesh offset information is greater than a preset offset threshold; If the mesh offset information is greater than the preset offset threshold, then the mesh offset; If the mesh offset information is less than or equal to the preset offset threshold, then the mesh is not offset.

4. The printing screen overprint warning method according to claim 1, characterized in that, The step of determining whether there are abnormal grayscale change regions in the current screen printing image based on the current grayscale information corresponding to the current screen printing image includes: Perform grayscale analysis on the current screen image to obtain the current grayscale information; The grayscale difference value corresponding to each pixel is calculated based on the current grayscale information and the initial grayscale reference information of the printing screen. Based on the grayscale differences, determine whether there are areas of abnormal grayscale variation in the current screen image.

5. The printing screen overprint warning method according to claim 4, characterized in that, The step of determining whether there are abnormal grayscale change regions in the current screen image based on the grayscale differences includes: Determine whether each grayscale difference is within a preset difference threshold range; If the grayscale difference is within the preset difference threshold range, then the pixel corresponding to the grayscale difference is an abnormal pixel. If the grayscale difference is not within the preset difference threshold range, then the pixel corresponding to the grayscale difference is a normal pixel. Perform region clustering analysis on the abnormal pixels to obtain candidate abnormal regions; Determine whether the area of ​​the candidate abnormal region is greater than a preset area threshold; If the area of ​​the candidate abnormal region is greater than a preset area threshold, then the current halftone image has an abnormal grayscale change region. If the area of ​​the candidate abnormal region is less than or equal to a preset area threshold, then the current screen image does not have any abnormal grayscale change areas.

6. The printing screen overprint warning method according to claim 1, characterized in that, The step of generating printing screen overprint warning information based on the grayscale information includes: Determine whether the grayscale value in the grayscale information is greater than a preset shutdown grayscale threshold; If the grayscale value in the grayscale information is greater than the preset shutdown grayscale threshold, then the printing screen overprint warning information is generated based on the shutdown command.

7. The printing screen overprint warning method according to claim 1, characterized in that, After determining whether the grayscale value in the grayscale information is greater than the preset shutdown grayscale threshold, the method further includes: If the grayscale value in the grayscale information is less than or equal to the preset stop grayscale threshold, then multiple feature points are extracted from the initial screen image corresponding to the printing screen as reference feature points according to the preset features. Multiple real-time feature points are extracted from the current screen image based on each of the aforementioned reference feature points; Based on the feature matching algorithm, each of the aforementioned baseline feature points and each of the aforementioned real-time feature points are matched to obtain successfully matched valid feature point pairs; The overlap ratio is calculated based on the number of effective feature point pairs and the number of reference feature points; The printing screen overprint warning information is generated based on the overlap degree.

8. A printing screen bursting early warning device, characterized in that, include: The imaging module is used to capture images of the printing screen using an industrial camera to obtain the current image of the screen. The judgment module is used to determine whether the outline edge of the current screen image has changed based on the mesh offset information corresponding to the current screen image, and to determine whether there is an abnormal grayscale change area in the current screen image based on the current grayscale information corresponding to the current screen image. The early warning module is used to generate printing screen overprint warning information based on the grayscale information if the outline edge of the current screen image changes and there is an abnormal grayscale change area in the current screen image.

9. A computer device, characterized in that, The device includes a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, implements the printing screen overprint warning method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the printing screen overprint warning method as described in any one of claims 1 to 7.

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