LED light guide plate defect detection method based on machine vision

Abstract

The invention discloses an LED light guide plate defect detection method based on machine vision. The method comprises the steps of: collecting multi-view original images of a light guide plate in aneffective illumination structure; preprocessing the original image; positioning the light guide plate ROI area of the image after edge enhancement and segmenting the light guide plate ROI area and a background area; performing illumination influence elimination and defect part enhancement processing on the segmented light guide plate image to obtain an image after defect part enhancement; detecting the defect of the conventional size in the image with the enhanced defect part, and determining the final defect point of the conventional size; and detecting fine-size defects in the image with theenhanced defect part, and determining final fine-size defect points. The method has the advantages that an image acquisition and lighting scheme is combined with machine vision, automation of light guide plate image segmentation and defect classification detection is achieved, and detection precision and accuracy are improved through adoption of an effective image enhancement and preprocessing method while detection efficiency is not affected.

Description

technical field [0001] The invention relates to a defect detection method of an LED light guide plate based on machine vision, and belongs to the technical field of defect detection. Background technique [0002] As an important part of the underlying structure of the LED LCD screen, the quality of the light guide plate determines the imaging quality of the LED screen. During the production of the light guide plate in the injection molding machine, due to the internal defects of the machine and the external dust pollution, the light guide plate is often caused. Defects such as white spots, dark spots, scratches, dirt, and side light leakage occur, and because of the small size of these defects, it is very difficult to detect them manually, and at the same time, manual inspection also causes waste of labor costs and Increased production costs. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of the pr...

AI Technical Summary

Problems solved by technology

[0002]Light guide plate is an important part of the underlying structure of the LED LCD screen, its quality determines the imaging quality of the LED screen, and the light guide plate is produced in the injection molding machine. Due to the internal defects of the machine and external dust pollution, defects such as white spots, dark spots, scratches, dirt, and side light leakage often occur on the light guide plate. Due to the small size of these defects, they can be inspected manually It is very difficult to produce, and at the same time, the waste of labor costs and the increase of production costs caused by manual inspection

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