LED light guide plate defect detection method based on machine vision

A defect detection and machine vision technology, applied in the field of defect detection, can solve problems such as small size, scratches, side light leakage, etc., and achieve the effect of improving precision and accuracy

Active Publication Date: 2020-06-09
HOHAI UNIV CHANGZHOU
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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

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  • LED light guide plate defect detection method based on machine vision
  • LED light guide plate defect detection method based on machine vision
  • LED light guide plate defect detection method based on machine vision

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[0051] The present invention will be further described below in conjunction with the drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0052] Such as figure 1 , 2-1 As shown in 2-2, a defect detection device and detection method for LED light guide plates based on machine vision includes the following steps:

[0053] (1) Multi-camera multi-angle deployment structure for collecting images of light guide plates

[0054] (2) The lighting device structure that provides good lighting conditions for the light guide plate body;

[0055] The specific structure of the device is as follows:

[0056] As shown in Figure 2, the light guide plate image acquisition device adopts the setup of dual cameras (6), one of the cameras is located directly above the light guide plate (1) display stand, and the other camera is located at the 45° angle positio...

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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...

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Application Information

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IPC IPC(8): G01N21/958
CPCG01N21/958
Inventor 张学武邵晓琦卢鑫许海燕徐晓龙
Owner HOHAI UNIV CHANGZHOU
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