Rapid high-precision appearance quality detection system and detection method for reflective curved surface

Abstract

The invention discloses a rapid and high-precision appearance quality detection system and method for a reflective curved surface. The rapid and high-precision appearance quality detection system comprises a high-speed light source control system, a motion control system, a line scanning image acquisition system and a real-time controller. Before detection, a light source control technology is used for testing light path information of surface reflection in advance, or a CAD model is used for automatic generation through computer analysis, and a model of working surface reflection is obtained. During detection, a high-resolution line scanning camera is used for scanning a curved surface, an LED of a light source at a specific angle is controlled to be lightened through known reflection model information, and finally a non-reflection multi-angle diffuse reflection image and a specular reflection image with proper brightness are obtained. After the two images are subtracted, a good enhancement effect is achieved on defects such as scratches and smudginess with diffuse reflection characteristics and surface damage defects such as edge breakage and concave-convex points, good imaging quality is guaranteed, and the detection accuracy of tiny defects on the reflective surface is improved. And meanwhile, aiming at the problem of curved surface detection, through adjustment of hardware such as a light source and a camera, accurate detection within a 120-degree range is completed on the premise of ensuring the detection speed.

Description

technical field [0001] The invention belongs to the technical field related to industrial quality detection, and more specifically relates to a fast and high-precision appearance quality detection system and detection method for reflective curved surfaces. Background technique [0002] In recent years, the shells of many products have undergone processes such as baking paint and electroplating to make the surface smooth and bright. The back cover of the mobile phone has also changed from the original frosted plastic to 3D tempered glass. The resulting problem is that machine vision equipment often faces strong reflections when performing automated inspections, which affects the accuracy of inspection results. Compared with ordinary objects, the defects of reflective surface objects are slightly different from normal surfaces, and the contrast is very low. For example, some concave and convex points, this kind of defect is only that the surface is no longer flat, but the col...

AI Technical Summary

Problems solved by technology

However, this method is applied to an area array camera and cannot be used on an online scanning system, and the detection accuracy is limited

In addition, more than 10 images need to be taken to decode the correct shape information, which cannot be widely used in the high-efficiency needs of the industry.

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