Printing defect detecting system

Abstract

The invention discloses a printing defect detecting system. The printing defect detecting system comprises an illuminating system, an image collecting system, an image recognition computer system anda defect warming and staged treatment device. The image collecting system transmits collected printed product images to the image recognition computer system to be recognized. The image recognition computer system recognizes the collected product images, whether a printed product has defects or not is judged according to the recognition result, and the printed product with the defects are warned or marked or removed through the defect alarming and staged treatment device. The defect warning and staged treatment device is used for giving an alarm when the printed product with the defects appears and marking the printed product with the defects or removing the printed product with the defects out of an assembly line. According to the printing defect detecting system, missing detection, falsedefection and dependency on the experience of detecting personnel caused by traditional manual detection can be avoided, the yield of outgoing products can be increased, the product quality can be improved, the algorithmic complexity can be reduced, the detecting rate can be increased, and the hardware cost can be reduced; and reliable data are provided for the improvement of the product yield and quality and increase of the yield, the automation and intellectualization degree of a production line is improved, and the human cost is reduced.

Description

technical field [0001] The invention relates to the field of printing defect detection, in particular to a printing defect detection system. Background technique [0002] Printing technology has been applied to more and more industrial production fields such as wall and floor tiles, fabrics, and ceramics. Because inkjet sprays different colors through multiple rows of printing nozzles, different colors are not printed at the same time or at the same position, and patterns of different colors need to be printed at the same position, but because of the temporary failure of the position sensor or some color nozzles, etc., the same time Different colors of a pattern may be misplaced or missing. [0003] The nozzles of each color are composed of many small nozzles or heating blocks, which are easy to be damaged, resulting in large ink droplets on the printed image, or a color missing or dragging line. [0004] If the above situation occurs, it will not only cause defective prod...

AI Technical Summary

Problems solved by technology

[0005] However, manual naked eye inspection has the following disadvantages: manual inspection is easy to miss or make mistakes; due to the possibility of many problems, it needs training and a long time of operation to get familiar with the situation, product quality and yield depend on the experience of workers; a detection station requires at least 3 Manpower, the labor cost is getting higher and higher; human eyes are prone to fatigue, and it is easier to make mistakes after fatigue

[0006] Industrial production such as wall and floor tiles and fabrics have complex and special printing patterns, and it is difficult to find a general image recognition algorithm

Some printing patterns imitate marble, granite and other patterns, and the colors are interlaced and complex

In some patterns, the printed pictures of each brick are different, and the printing system will randomly select a picture from a large picture to print, which causes the printed picture of each brick to be different.

As a result, the automatic judgment of the software system is very difficult and complicated, and it is difficult to find a general image recognition algorithm

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