Picture compression method in AOI (Automatic Optic Inspection) detection system and display panel defect detection system

A technology for displaying panel defects and compression methods, applied in image analysis, image communication, image data processing, etc., can solve problems such as resource consumption, image lossy compression, image data loss, etc., to reduce information volume, improve compression rate, The effect of reducing compression time

Active Publication Date: 2017-11-07
WUHAN JINGCE ELECTRONICS GRP CO LTD
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Problems solved by technology

However, the original image of the image detected by the display panel is relatively large. Although the use of lossless compression can reduce a part of the storage space, the compression efficiency is very slow, and the consumption of resources is very serious.
[0005] 2. Lossy compression of images
For example, image lossy compression using jpg format, although lossy compression can save a lot of storage space, and the efficiency is faster than lossl

Method used

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  • Picture compression method in AOI (Automatic Optic Inspection) detection system and display panel defect detection system
  • Picture compression method in AOI (Automatic Optic Inspection) detection system and display panel defect detection system
  • Picture compression method in AOI (Automatic Optic Inspection) detection system and display panel defect detection system

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[0023] The present invention will be further described in detail below in conjunction with specific embodiments:

[0024] For display panel AOI defect detection, it is generally necessary to take multiple display panel defect detection images, such as figure 2 As shown, in the process of taking each display panel defect detection image, the relative position of the camera and the display panel does not change. Therefore, the difference between the different display panel defect detection images taken by each camera is relatively small. These differences are often caused by the defects of the display panel itself. Using the pure white detection image as the background, and subtracting the pure white image from the rest of the image, a large amount of repetitive information can be removed and key effective information is retained.

[0025] Based on the same camera, images taken by cameras under different display panel defect detection images have very similar characteristics. The pre...

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Abstract

The invention relates to a picture compression method in an AOI (Automatic Optic Inspection) detection system. The picture compression method comprises the following steps: step 1, arranging a display panel defect detection image group, determining a pure white detection image in the display panel defect detection image group as a first detection image, and sorting other detection images except the pure white detection image in the display panel defect detection image group in any order; step 2, performing a difference value subtraction operation on pixel values of other images except the pure white detection image and a pure black detection image in the display panel defect detection image group and a pixel value of the first detection image orderly, and obtaining a plurality of corresponding foreground images; step 3, removing a negative value of the pixel value of each foreground image and obtaining each corrected foreground image; and step 4, respectively performing image lossless compression on each corrected foreground image, and directly performing image lossless compression on the pure black detection image and the pure white detection image. The picture compression method in the AOI detection system provided by the invention can guarantee the compression ratio and shorten the compression time.

Description

technical field [0001] The invention relates to the technical field of automatic defect detection of display panels, in particular to an image compression method in an AOI (Automatic Optic Inspection, automatic optical inspection) detection system and a display panel defect detection system. Background technique [0002] With the development of the display panel inspection industry, the size and resolution of the display panel are getting higher and higher, and the resolution of the corresponding industrial camera (CCD / CMOS) for defect testing of the display panel is also getting higher and higher. When the panel is subjected to defect testing, more and more testing images are needed to detect each test picture of the display panel. Assuming the detection of a 55-inch 4K (2160*3840) resolution LCD (Liquid Crystal Display, liquid crystal display) panel, on the premise of meeting the minimum detection accuracy of 1 / 2subpixel, at least three cameras with a resolution of 29M are...

Claims

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Application Information

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IPC IPC(8): H04N17/00H04N19/182H04N19/423G06T7/194G06T7/32
CPCG06T7/194G06T7/32H04N17/00H04N19/182H04N19/423
Inventor 张胜森邓标华吕东东
Owner WUHAN JINGCE ELECTRONICS GRP CO LTD
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