Background suppression method in TFT-LCD screen automatic optical detection

A background suppression and optical detection technology, applied in optics, nonlinear optics, image enhancement, etc., can solve the problem of poor texture suppression effect, and achieve the effect of maintaining contrast, suppressing background texture, adaptive and robust.

Active Publication Date: 2017-04-05
WUHAN JINGCE ELECTRONICS GRP CO LTD
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a background suppression method in the automatic optical inspection of TFT-LCD screens, aiming to solve the problem that the background suppression weakens the defect contrast in the prior art, resulting in poor texture suppression effect. technical problem

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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] The invention provides a method for background suppression in automatic optical detection of TFT-LCD screens; the method performs multi-scale and multi-directional wavelet decomposition on TFT-LCD images, and suppresses and decomposes the high-frequency and low-frequency sub-bands after wavelet decomposition respectively. Enhancement, and finally the defect image after texture background suppression is obtained through wavelet reconstruction, so as to solve the problem that the traditional filtering method weakens the contrast of defects while suppressing the background.

[0032] The backgro...

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Abstract

The invention provides a background suppression method in TFT-LCD screen automatic optical detection. The method includes the following steps that firstly, images under different TFT-LCD point screen modes are collected; secondly, a series of high-frequency sub-bands and low-frequency sub-bands are obtained after multi-stage wavelet decomposition of the images; thirdly, each stage of high-frequency sub-bands in multiple directions are subjected to coefficient smoothing, and each stage of low-frequency sub-bands are subjected to contrast enhancement; fourthly, the processed high-frequency sub-bands and the processed low-frequency sub-bands are subjected to wavelet reconstruction, and defect images are obtained after background suppression. The images are subjected to multi-scale multi-resolution decomposition, the decomposed high-frequency sub-bands and the decomposed low-frequency sub-bands are subjected to texture suppression and image enhancement respectively, the contrast of original defects can be kept while background texture is suppressed, and the texture suppression effect is good.

Description

technical field [0001] The invention belongs to the technical field of automatic optical defect detection, and more specifically relates to a background suppression method in automatic optical detection of TFT-LCD screens. Background technique [0002] Due to the characteristics of low power consumption, high definition and low radiation, TFT-LCD (Thin Film Transistor Liquid Crystal Display) has become the current mainstream display device and plays an irreplaceable role in the process of two-dimensional and three-dimensional information transmission. [0003] The production process of TFT-LCD is very complicated, so that various display defects will inevitably occur in the actual preparation process, among which mura defects are the most difficult to detect. The traditional detection method relying on human eyes has many shortcomings, such as high cost, instability and low efficiency. In recent years, machine vision defect detection methods have attracted widespread attent...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G06T5/00G06T5/20
CPCG02F1/1309G06T5/20G06T2207/30121G06T2207/20064G06T2207/10004G06T5/73G06T5/70G06T5/10G06T2207/10024G06T2207/20016G06T5/40G06T7/0004G06T2207/30108G06T5/92
Inventor 鲁方波姚峰邓标华陈凯沈亚非
Owner WUHAN JINGCE ELECTRONICS GRP CO LTD
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