US 12,437,387 B2
Screen defect detection method, apparatus, and electronic device
Xiufeng Song, Shandong (CN); Yifan Zhang, Shandong (CN); Jie Liu, Shandong (CN); and Wenchao Zhang, Shandong (CN)
Assigned to GOERTEK OPTICAL TECHNOLOGY CO., LTD, Shandong (CN)
Appl. No. 18/246,806
Filed by GOERTEK OPTICAL TECHNOLOGY CO., LTD, Shandong (CN)
PCT Filed Aug. 25, 2021, PCT No. PCT/CN2021/114453
§ 371(c)(1), (2) Date Mar. 27, 2023,
PCT Pub. No. WO2022/062812, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 202011039225.X (CN), filed on Sep. 28, 2020.
Prior Publication US 2023/0368361 A1, Nov. 16, 2023
Int. Cl. G06T 7/00 (2017.01); G06T 7/11 (2017.01)
CPC G06T 7/0004 (2013.01) [G06T 7/11 (2017.01); G06T 2207/30164 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A screen defect detection method, comprising the following steps:
identifying a number of suspected defective pixel points from a detection image of a target screen;
determining a suspected defect region corresponding to a suspected defective pixel point in the detection image;
dividing the suspected defect region into a general region and a core region; and
judging whether the target screen has a transparent defect according to a mean gray value of the suspected defect region, a mean gray value of the general region and a minimum gray value of the core region-,
wherein the step of judging whether the target screen has a transparent defect according to a mean gray value of the suspected defect region, a mean gray value of the general region and a minimum gray value of the core region comprises:
calculating a ratio of the minimum gray value of the core region to the average gray value of the general region as a local contrast;
calculating a ratio of the minimum gray value of the core region to the average gray value of the suspected defect region as a global contrast; and
judging whether the target screen has a transparent defect by using the local contrast and the global contrast.