Character defect detection method and device based on morphology

Abstract

The invention discloses a character defect detection method and device based on the morphology. The device includes a production line conveyor belt 1, a PC machine 2, an industrial camera 3 and a digital light source 4. The method includes the following steps that, installation and position calibration of the digital light source and the industrial camera are conducted respectively, and pixel equivalent calibration is conducted on the industrial camera; a template is established; a real-time test image, collected by the industrial camera, of a product on a production line conveyor belt is processed through a loading module; the integrity of a test area of the test image is judged; the test image and a character skeleton image and a character expansion image of the template are extracted respectively; the bidirectional morphological operation is used for judging the continuity and integrity of characters in the test image, a character defect area is marked by color rendering, the morphological operation serves as the core, and the two-way comparison of the product and the template is completed. The detection accuracy is high and the cost of manual re-evaluation is reduced.

Description

technical field [0001] The invention relates to the fields of digital images and computer vision, in particular to a method and device for detecting character defects based on morphology. Background technique [0002] Now products in all walks of life will be printed or engraved with some product information (such as origin, company name, product name, QR code, etc.) for customers to identify and verify the authenticity of the product. The detection of these text and image code information is a very important part of the product production process. Character defects such as shadows. [0003] Because the printing head of the current printing equipment or laser engraving equipment prints characters, there are generally certain errors, that is, the thickness of the character strokes and the character spacing are not completely consistent, and the complexity (number of strokes) of each character is not the same. Most of the current character defect detection software achieves ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a character defect detection method and device based on morphology, which can effectively solve the problem of misjudgment of character detection caused by printing errors and complex characters, reduce the rate of manual re-inspection, and improve the efficiency of enterprise production detection

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