Defect detection method for product of mirror surface bowl-shaped structure

Abstract

The invention relates to a defect detection method for a product of a mirror surface bowl-shaped structure. A part of the surface of the product to be detected is imaged in sequence by adopting a plurality of cameras and corresponding strip-shaped light sources, all defects on the surface of the product are well presented, the problem that the surface defects of the high-reflection mirror bowl-shaped product cannot be imaged is solved, automatic detection of the product is realized, and improvements of the quality and productivity of the production line are facilitated.

Description

technical field [0001] The invention relates to the technical field of visual inspection, in particular to a defect detection method for mirror-surface bowl-shaped structure products. Background technique [0002] With the continuous development of society, the degree of industrial automation is getting higher and higher, not only production is replaced by machines, but manual inspection will also be replaced by machines, so machine vision is widely used. In all surface defect inspection, the goal of imaging exploration must be to find an imaging method that can obtain better defect contrast and uniform image. For the surface inspection of mirror products, imaging generally needs to form a spot effect in order to have a good defect presentation, but for products with a mirror surface and a bowl shape, the imaging problem cannot be well solved. According to the characteristics that the dome light source can reduce the influence of surface unevenness, the imaging contrast is ...

AI Technical Summary

Problems solved by technology

For the surface inspection of mirror products, the imaging generally needs to form a spot effect to have a good defect presentation, but for products with a mirror surface and a bowl shape at the same time, the imaging problem cannot be solved well

According to the characteristics that the dome light source can reduce the impact of surface unevenness, the imaging contrast is reduced when the dome light source is used for imaging.

Using a customized large-area vertical ring light and a large-size parallel coaxial test, the large-area vertical ring light can obtain a relatively uniform spot imaging effect, but in the subsequent defect testing process, it is found that the large light spot has a slight defect effect on it The imaging is not good enough to meet the detection requirements. In order to increase its contrast, the light source has been modified by adding a parallel film of the light source, but it still cannot meet the requirements; in many tests, it is found that only a certain range of light spots can better present the defects. To meet the detection requirements, there will be optical interference in the large spot

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