Machine vision-based detection method for screen blockage defects in rotary screen or flat screen printing machines

Abstract

The invention discloses a machine vision-based detection method for a clogging defect of a rotary screen or flat screen printing machine, which includes collecting a template image, preprocessing the template image, collecting a detection image, preprocessing the detection image, comparing the template image and the detection image, In the step of outputting the network blocking defect area and the network blocking defect image, the central processor performs an intersection operation on the network blocking defect area Ru obtained in the two detection images before and after, and obtains the center position Pi of each network blocking defect after the intersection, with Pi as the center , respectively from the color substrate image A r and color template image A m The fixed-size defect thumbnails and template thumbnails are intercepted and displayed on the software interface, and the central processing unit controls the alarm to complete the detection of network blocking defects on the substrate. The invention can automatically detect the blocking defects and mark the positions of the blocking defects, which greatly reduces the labor intensity of operators and the skill requirements for operators, greatly reduces the missed detection of printing network blocking defects, and ensures the genuine rate of printed products .

Description

technical field [0001] The invention relates to a method for detecting screen blocking defects of a rotary screen or flat screen printing machine, belonging to the technical field of textile printing and dyeing. Background technique [0002] Rotary screen printing or flat screen printing is a printing method that uses a scraper to print the color paste in the rotary screen or the color paste on the flat screen onto the fabric under pressure. The labor intensity of the rotary screen printing machine and the flat screen printing machine Low cost, high production efficiency, and strong adaptability to fabrics. However, in the process of rotary screen printing or flat screen printing, because impurities such as fiber fluff are often attached to the surface of the rotary screen or flat screen, or insoluble particles in the color paste conjunctiva in the mesh of the rotary screen or flat screen, and the printing color paste The mesh of the rotary screen or the mesh of the flat sc...

AI Technical Summary

Problems solved by technology

At present, the detection of blockage defects on rotary screens or flat screens is mainly based on manual observation during the printing process. Manual observation has the disadvantages of high labor intensity and easy missed inspections.

Moreover, due to the particularity of the rotary screen or flat screen printing process, if there is a screen blockage during the printing process, if it is not discovered by humans in time, it will cause a large number of defective fabrics and bring huge losses to the enterprise.