3D curved surface glass surface flatness defect detection method based on linear scan laser

Abstract

Provided is a 3D curved surface glass surface flatness defect detection method based on a linear scan laser; a to-be-detected 3D curved surface glass and an objective table are provided; the defect detection method comprises the following steps: enabling a visual imaging system to gather three dimensional point cloud data; three dimensional reconstructing to obtain a three dimensional contour of the 3D curved surface glass; rendering the three dimensional point cloud data; projecting along the vertical direction of the objective table and carrying out gray scale transformation so as to obtaina first grey-scale map and a second grey-scale map; extracting ROI of an image area of the 3D curved surface glass; selecting a defect area according to the first and second grey-scale maps; automatically coupling and evaluating the defects of the 3D curved surface glass. The invention provides the 3D curved surface glass surface flatness defect detection method based on the linear scan laser, sothe 3D curved surface glass surface flatness defects can be obviously displayed in the image; the invention also provides an image processing detection algorithm that can fast and accurately detect insufficient flatness defects, and the defects can be automatically coupled and evaluated via analysis comparison.

Description

technical field [0001] The invention relates to the technical field of detection of curved glass defects, in particular to a detection method for surface flatness defects of 3D curved glass based on a line-scanning laser. Background technique [0002] As the glass back cover of the mobile phone replaces the traditional metal case, the 3D curved glass cover plate has become a highlight. Its high-value appearance and excellent handle quickly become the new favorite of consumers, and gradually become the pursuit of domestic manufacturers. hotspot. 3D curved glass is mainly used in the protective screen and back cover of intelligent terminal products. Compared with traditional 2D or 2.5D glass, curved glass has the characteristics of light and thin, transparent and clean, anti-fingerprint, and anti-vertigo. [0003] After the production of 3D curved glass is completed, the surface of the glass screen needs to be inspected to determine its surface quality and whether there are a...

AI Technical Summary

Problems solved by technology

The existing technology is to use machine vision instead of artificial vision for detection. Using machine vision to detect the surface smoothness of 3D curved glass is a method, but due to the good transparency and low reflection of glass, errors are prone to occur in long-term detection, and it is difficult Record specific location information; defects cannot be quickly detected on some glass where defects are not obvious

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