US 11,741,591 B2
Method and apparatus for detecting thickness of paper and storage medium
Li Jiang, Shandong (CN); Rongxin Song, Shandong (CN); Xiumei Qi, Shandong (CN); and Jie Xian, Shandong (CN)
Assigned to WEIHAI HUALING OPTO-ELECTRONICS CO., LTD., Shandong (CN)
Appl. No. 16/982,600
Filed by WEIHAI HUALING OPTO-ELECTRONICS CO., LTD., Shandong (CN)
PCT Filed May 17, 2019, PCT No. PCT/CN2019/087344
§ 371(c)(1), (2) Date Sep. 21, 2020,
PCT Pub. No. WO2020/052263, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 201811075178.7 (CN), filed on Sep. 14, 2018.
Prior Publication US 2021/0209745 A1, Jul. 8, 2021
Int. Cl. G06K 9/00 (2022.01); G06T 7/00 (2017.01); G01B 11/06 (2006.01); G06T 5/50 (2006.01); G07D 7/164 (2016.01)
CPC G06T 7/0004 (2013.01) [G01B 11/06 (2013.01); G06T 5/50 (2013.01); G07D 7/164 (2013.01); G06T 2207/20216 (2013.01); G06T 2207/30124 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for detecting a thickness of paper, comprising:
acquiring a first thickness image of a target paper;
extracting at least one first thickness feature and at least one second thickness feature from the first thickness image, wherein a number of pixel points of each of the at least one first thickness feature in the first thickness image is smaller than or equal to a first target threshold, and a number of pixel points of each of the at least one second thickness feature in the first thickness image is greater than the first target threshold;
performing average processing on gray values of a plurality of pixel points in the at least one first thickness feature to acquire a first gray value, and performing the average processing on gray values of a plurality of pixel points in the at least one second thickness feature to acquire a second gray value; and
when the first gray value is smaller than the second gray value of a plurality of pixel points in the at least one second thickness feature, determining that a thickness of a region, corresponding to the at least one second thickness feature, on the target paper has changed.