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

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...

AI Technical Summary

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 lossless compression, but lossy compression may cause some weak image data loss, while the display panel Defects can be very weak, so this form of lossy compression is also not advisable

[0006] In addition, consider this problem from the perspective of the hard disk, such as using multiple hard disk components Raid for storage, or using solid-state hard disks, but after all, the problem of image data volume and compression performance has not been solved.

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