Offset printing online quality inspection system

Abstract

The invention discloses an online quality inspection system for offset printing. Comprising an image acquisition module, an image processing module, a layout positioning module, an image comparison module, a color detection module, a size detection module, a defect detection module, a bar code identification module, a data storage module, a statistical analysis module, an alarm module, an automatic elimination module, a user interface module, an equipment self-inspection module and a remote monitoring module. According to the offset printing online quality inspection system provided by the invention, full-automatic real-time quality inspection in the printing production process is realized through combination of multiple functional modules such as image acquisition, processing, layout positioning, color detection, flaw detection and automatic rejection, and the quality inspection accuracy is improved by utilizing a high-definition image acquisition and comparison algorithm. The accuracy of detection data is ensured, personal errors are effectively reduced, all the modules form a closed loop through the data processing unit and the control unit, the detection data are fed back in real time, and unqualified products are automatically removed.

Description

Technical Field

[0001] The invention relates to an online printing quality inspection system, in particular to an online offset printing quality inspection system, and belongs to the technical field of printing quality control. Background Art

[0002] In the offset printing production process, traditional quality inspection relies on manual sampling. Although manual inspection can detect some printing deviations and defects, it is impossible to fully cover each printed product, resulting in a high missed detection rate and slow data feedback, affecting the overall production quality control. With the improvement of production efficiency and quality requirements in the printing industry, the existing manual sampling methods are difficult to meet the high precision and high automation requirements of modern production. Although there are some online detection equipment on the market, there are generally problems such as large detection errors and poor real-time feedback effects, which affect the accuracy of online quality management. Therefore, there is an urgent need for an automated quality inspection system that can perform online detection efficiently and in real time to improve the quality and detection efficiency of printed products. Summary of the invention

[0003] The object of the present invention is to provide an online quality inspection system for offset printing to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an offset printing online inspection system, comprising an image acquisition module, an image processing module, a layout positioning module, an image comparison module, a color detection module, a size detection module, a defect detection module, a barcode recognition module, a data storage module, a statistical analysis module, an alarm module, an automatic rejection module, a user interface module, an equipment self-inspection module and a remote monitoring module, wherein the image acquisition module is connected to the image processing module, the image processing module is connected to the layout positioning module, the layout positioning module is connected to the image comparison module, the image comparison module is connected to the color detection module and the size detection module in parallel, the color detection module and the size detection module are connected to the defect detection module, the defect detection module is connected to the barcode recognition module, the barcode recognition module is connected to the data storage module, the data storage module is connected to the statistical analysis module, the statistical analysis module is connected to the alarm module and the automatic rejection module, the alarm module and the automatic rejection module are connected to the user interface module, and the user interface module is connected to the remote monitoring module and the equipment self-inspection module.

[0005] As a preferred technical solution of the present invention, the image processing module includes an image denoising unit and a contrast enhancement unit, which pre-process the image to remove image noise and enhance contrast.

[0006] As a preferred technical solution of the present invention, the layout positioning module identifies the layout position of the printed product through a position detection algorithm, and compares the boundary of the printed layout with the standard layout.

[0007] As a preferred technical solution of the present invention, the color detection module is based on spectral analysis technology and is provided with a color difference detection unit for detecting color deviation of an image and ensuring color consistency of each printed product through a color calibration algorithm.

[0008] As a preferred technical solution of the present invention, the size detection module includes a size measurement unit for measuring the edge and size of the printed product.

[0009] As a preferred technical solution of the present invention, the defect detection module detects common defects on printed products, including scratches, ink spots, missing prints and incomplete printing defects, through an image defect recognition algorithm, and transmits the detection results to a data processing unit.

[0010] As a preferred technical solution of the present invention, the barcode recognition module includes a barcode and QR code recognition unit, which is used to read and recognize the barcode or QR code on the printed matter, ensure the integrity and clarity of the barcode / QR code content, and store the recognition results in the data storage module.

[0011] As a preferred technical solution of the present invention, the data storage module is used to store the data of each detection module, including images, detection results, identification information and statistical analysis data, so as to facilitate quality traceability and future analysis.

[0012] As a preferred technical solution of the present invention, the statistical analysis module includes a data statistics unit and a quality analysis unit, which are used to summarize and analyze the detection data.

[0013] As a preferred technical solution of the present invention, the user interface module provides a visual interface for operators to view detection status, data, and images in real time, and supports the adjustment and setting of system parameters.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is an online quality inspection system for offset printing. The online quality inspection system for offset printing provided by the present invention realizes full-automatic real-time quality inspection in the printing production process through a combination of multiple functional modules such as image acquisition, processing, layout positioning, color detection, defect detection, and automatic rejection. It utilizes high-definition image acquisition and comparison algorithms to ensure the accuracy of detection data and effectively reduce human errors. Moreover, each module forms a closed loop through a data processing unit and a control unit, and real-time feedback of detection data is provided to automatically reject unqualified products, thereby realizing rapid response and online quality control. Furthermore, through an automatic rejection module and a remote monitoring module, the need for manual intervention is reduced and production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the module flow of the present invention. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 The present invention provides an offset printing online quality inspection system, an offset printing online quality inspection system, including an image acquisition module, an image processing module, a layout positioning module, an image comparison module, a color detection module, a size detection module, a defect detection module, a barcode recognition module, a data storage module, a statistical analysis module, an alarm module, an automatic rejection module, a user interface module, an equipment self-test module and a remote monitoring module, each module is connected through a data processing unit and a control unit to form a closed-loop system of real-time detection and feedback. The data processing unit is responsible for collecting and analyzing the output data of each module, and feeding back the analysis results to the control unit in real time to realize dynamic management and automatic control of printing quality detection.

[0018] During the production process, the image acquisition module uses a high-definition camera to collect real-time images of each printed product and transmits the image data to the image processing module. The image processing module removes noise and enhances contrast on the collected images to ensure that the image data is clear and accurate. Subsequently, the image is transmitted to the layout positioning module, which uses a position detection algorithm to identify the layout boundaries of the printed product to ensure that the image is aligned with the printing layout.

[0019] The aligned images are transmitted to the image comparison module for comparison, which compares the live image with the standard image at pixel level to detect color difference, blur and other inconsistencies. The color detection module further analyzes the color deviation of the image to ensure the color consistency of each print. The size detection module is used to measure the edges and dimensions of the print to ensure that it meets the set size standards.

[0020] During the inspection process, if defects, size deviations or color discrepancies are found, the alarm module will immediately sound and light alarms to notify the operator. At the same time, the automatic rejection module is activated to remove unqualified products from the production line through mechanical devices to ensure the qualified rate of the output products. Each inspection data and image is stored in the data storage module to support subsequent quality traceability and data statistical analysis.

[0021] The statistical analysis module will summarize the test data and generate real-time quality reports and test pass rates. Operators can view the test status in real time through the user interface module and set and adjust the test parameters in the system. The remote monitoring module supports managers to view the production status through the network, facilitating remote quality control and parameter optimization.

[0022] When used specifically, the present invention provides an offset printing online inspection system, image acquisition: the image acquisition module acquires the printed image through a high-definition camera and transmits the image data to the image processing module, the image processing module performs denoising and contrast enhancement on the image data to improve the clarity and contrast of the image, the pre-processed image enters the layout positioning module to determine the boundary matching between the image and the printed layout to ensure the consistency of the layout position; the positioned image enters the image comparison module to compare the standard image with the detection image in real time to identify the difference between the printed product and the standard; the color detection module performs spectral analysis on the color of the image, detects color difference, and ensures color consistency; the size detection module measures the edge and size of the printed product, and compares it with the set standard , ensure that it meets the specifications; the defect detection module detects common printing defects such as scratches and ink spots in the image to determine whether it is qualified; the barcode recognition module recognizes the barcode or QR code content on the printed matter and stores the results in the data storage module; each test result and image is stored in the data storage module to support subsequent analysis and traceability; the statistical analysis module summarizes the data, generates quality reports and qualified rates, and supports quality control; when unqualified products are detected, the alarm module issues an audible and visual alarm, and the unqualified products are removed through the automatic rejection module; the user interface module displays real-time detection status and data, and the operator can adjust parameters; the remote monitoring module supports remote real-time monitoring of the system status, and the equipment self-test module regularly detects the system to ensure normal operation of the system.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An offset printing online inspection system, comprising an image acquisition module, an image processing module, a layout positioning module, an image comparison module, a color detection module, a size detection module, a defect detection module, a barcode recognition module, a data storage module, a statistical analysis module, an alarm module, an automatic rejection module, a user interface module, an equipment self-inspection module and a remote monitoring module, characterized in that: The image acquisition module is connected to the image processing module, the image processing module is connected to the layout positioning module, the layout positioning module is connected to the image comparison module, the image comparison module is connected in parallel to the color detection module and the size detection module, the color detection module and the size detection module are connected to the defect detection module, the defect detection module is connected to the barcode recognition module, the barcode recognition module is connected to the data storage module, the data storage module is connected to the statistical analysis module, the statistical analysis module is connected to the alarm module and the automatic rejection module, the alarm module and the automatic rejection module are connected to the user interface module, and the user interface module is connected to the remote monitoring module and the equipment self-test module.

2. The offset printing online quality inspection system according to claim 1, characterized in that: The image processing module includes an image denoising unit and a contrast enhancing unit, which preprocess the image to remove image noise and enhance contrast.

3. The offset printing online quality inspection system according to claim 1, characterized in that: The layout positioning module identifies the layout position of the printed product through a position detection algorithm, and compares the boundary of the printed layout with the standard layout.

4. The offset printing online quality inspection system according to claim 1, characterized in that: The color detection module is based on spectral analysis technology and is provided with a color difference detection unit for detecting the color deviation of the image and ensuring the color consistency of each printed product through a color calibration algorithm.

5. The offset printing online quality inspection system according to claim 1, characterized in that: The size detection module includes a size measurement unit for measuring the edge and size of the printed product.

6. The offset printing online quality inspection system according to claim 1, characterized in that: The defect detection module detects common defects on printed products, including scratches, ink spots, missing prints and incomplete printing defects, through an image defect recognition algorithm, and transmits the detection results to the data processing unit.

7. The offset printing online quality inspection system according to claim 1, characterized in that: The barcode recognition module includes a barcode and two-dimensional code recognition unit, which is used to read and recognize the barcode or two-dimensional code on the printed matter, ensure the integrity and clarity of the barcode / two-dimensional code content, and store the recognition result in the data storage module.

8. The offset printing online quality inspection system according to claim 1, characterized in that: The data storage module is used to store the data of each detection module, including images, detection results, identification information and statistical analysis data, so as to facilitate quality traceability and future analysis.

9. The offset printing online quality inspection system according to claim 1, characterized in that: The statistical analysis module includes a data statistics unit and a quality analysis unit, which are used to summarize and analyze the detection data.

10. The offset printing online quality inspection system according to claim 1, characterized in that: The user interface module provides a visual interface for operators to view detection status, data, and images in real time, and supports the adjustment and setting of system parameters.

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