Defect based lossless image compression method and display panel defect detection system

Abstract

The invention relates to a defect based lossless image compression method, which comprises the following steps: step one, correcting image distortion; step two, cutting a ROI region; step three, carrying out illumination compensation and strengthening the contrast; step four, inhibiting noise and texture; and step five, carrying out image lossless compression. The provided method has the advantages that the detection image compression rate can reach 85% or more, (the normal lossless compression rate is about 50%), and the processing time is only about 64% of that of common lossless compression.

Description

technical field [0001] The invention relates to the technical field of display panel automatic defect detection, in particular to a defect-based image compression method 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 required. Assuming that 15 inspection images are required to inspect each di...

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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