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High-resolution light guide plate image defect detection method

A high-resolution, defect detection technology, applied in the direction of image enhancement, image analysis, image data processing, etc., can solve the problems of detection accuracy and detection time length gap, and achieve the effect of stable algorithm, improved accuracy and simple detection algorithm

Active Publication Date: 2018-12-28
杭州舜浩科技有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, methods such as curvelet transformation, contourlet transformation and shearlet transformation are applied to the detection of common defects in light guide plates, but these algorithms still have a certain gap from the relevant standards of enterprises in terms of detection accuracy and detection time.

Method used

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  • High-resolution light guide plate image defect detection method
  • High-resolution light guide plate image defect detection method
  • High-resolution light guide plate image defect detection method

Examples

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Embodiment 1

[0089] Embodiment 1, high-resolution light guide plate image defect detection method, such as Figure 1-19 shown, including the following steps:

[0090] 1) The defect of the light guide plate is small and difficult to find. In order to detect the defect as much as possible, it is necessary to use a line array camera to collect the original image of the light guide plate; perform step 2;

[0091] After observation, it is found that the image of the light guide plate collected by the line scan camera meets the requirements in terms of texture clarity and light uniformity, which is very beneficial for the processing of follow-up work.

[0092] 2) Perform image enhancement on the original image of the light guide plate to obtain an enhanced image of the light guide plate; perform step 3;

[0093] The original image of the light guide plate collected by the line array camera has textures that are not clear enough in some areas and the details are slightly blurred. Perform detail...

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Abstract

The invention provides a high-resolution light guide plate image defect detection method, including the following steps: the original picture of the light guide plate is collected, a light guide plateoriginal image is enhanced, a maximum inter-class variance method is used for threshold segmentation of that image enhancement image of the light guide plate, the connected domain is obtained from the threshold processing display graph, a light guide plate whole connected region is extracted with that lar area, a maximum area extraction graph is transformed into a shape, a light guide plate imageshape conversion map is adjusted in a gray value, the gray value adjustment map is partitioned, Gaussian bias is applied to the partition display image of the light guide plate, a mask process is performed on the Gaussian partial derivative display image, Fourier positive transform is carried out on the mask processing display graph, a sinusoidal shape band-pass filter is established, inverse Fourier transform is carried out on the convolution display graph, threshold treatment is carried out on the inverse Fourier transform display graph, the connected domain is obtained on the second threshold treatment display graph, defects are extracted on the second connected domain display graph, and defects are displayed.

Description

technical field [0001] The invention relates to a method for detecting common defects of a light guide plate, in particular to a method for detecting image defects of a light guide plate with high resolution. Background technique [0002] Light Guide Plate (LGP) is made of optical-grade acrylic / PC plate, and then using high-tech materials with high reflectivity and non-absorbing light, engraving with V-shaped cross grid on the bottom surface of the optical-grade acrylic plate, laser Engraving and UV screen printing technology to print light guide points. Light guide plates have been widely used in the industrial field due to their advantages of lightness, thinness, high brightness and environmental friendliness. However, during the production process of the light guide plate, defects such as scratches, crushing, black spots, and white spots often appear. It may be that there is a lot of gas mixed in the melt in the heating cylinder (screw) that has not been discharged. In ...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/187
CPCG06T7/0008G06T7/187G06T2207/20024G06T2207/20056
Inventor 李俊峰卢彭飞楼小栋胡浩
Owner 杭州舜浩科技有限公司
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