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Detection method of shadow defect of light guide plate (LGP)

A defect detection and light guide plate technology, which is applied in image data processing, instruments, calculations, etc., can solve problems such as light guide plate shadow defects, artificial shadow detection accuracy, efficiency, and stability that are difficult to adapt to enterprises

Active Publication Date: 2018-11-23
金名山光电(吴江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, shadow detection is mainly done manually. Under the light of the inspection fixture, the inspector visually checks whether there are dark areas in one or more places of the light guide plate. If there are dark areas, it means that the light guide plate has shadow defects.
The accuracy, efficiency, and stability of artificial shadow detection are difficult to meet the requirements of enterprises

Method used

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  • Detection method of shadow defect of light guide plate (LGP)
  • Detection method of shadow defect of light guide plate (LGP)
  • Detection method of shadow defect of light guide plate (LGP)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Embodiment 1, light guide plate shadow defect detection method, such as Figure 1-17 shown, including the following steps:

[0093] (1) Adopt the surface frame camera of Hikvision Company to obtain the image F of the light guide plate, and perform step 2;

[0094] After observation, the light guide points are different in density and size, which can make the light guide points emit light evenly. The production precision of the light guide plate is high, and the shadow defect belongs to the surface defect, which needs to be observed as a whole, and does not need a very clear image. Generally, the required image is obtained by means of an area array camera.

[0095] (2) Obtain the size of the light guide plate image F, wherein the height and width are M and N respectively; perform step 3;

[0096] (3) realize image contrast enhancement by PECE (practical and efficient contrast enhancement method) method, obtain the contrast-enhanced image, and perform step 4;

[0097] ...

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Abstract

The invention provides a detection method of a shadow defect of a light guiding plate. Contrast is enhanced, salt and pepper noises are suppressed, filtering is carried out, two times of convolution are carried out, normalization of grayscale values is carried out, then two times of mean filtering are carried out, threshold segmentation processing is carried out, a connected domain of a foregroundimage is extracted, a connected-domain feature is processed, then the shadow defect is obtained, and the extracted shadow defect is displayed. According to the self-adaptive detection method of the light guide plate provided by the invention, complexity is relatively low, and automatic detection and extraction on a shadow of the light guide plate can be realized. An experiment result shows that detection accuracy and detection efficiency of the algorithm are higher, stability is higher, and the shadow can be detected in real time.

Description

technical field [0001] The invention relates to a defect detection method, in particular to a shadow defect detection of a light guide plate. Background technique [0002] Light Guide Plate (LGP) is made of optical-grade acrylic / PC sheet, and then high-tech materials with high reflectivity and non-absorbing light are used to engrave and V-shaped cross grid on the bottom surface of the optical-grade acrylic sheet Engraving and UV screen printing technology to print light guide points. LGP has been widely used in liquid crystal display, advertising lights, X-ray, flat panel lighting and other occasions due to its advantages of thinness, high brightness, uniform light guide, environmental protection, energy saving, and convenient maintenance. During the production process of the light guide plate, defects such as scratches, scratches, black spots, and shadows will inevitably appear on the surface; compared with other defects, shadows are difficult to detect and the detection p...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/62G06T5/00
CPCG06T7/0004G06T7/62G06T2207/20056G06T5/70
Inventor 李俊峰卢彭飞楼小栋胡浩
Owner 金名山光电(吴江)有限公司
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