(19)

(11)

EP 4 226 274 A1

(12)

(43) Date of publication: 16.08.2023 Bulletin 2023/33 (21) Application number: 21936704.2 (22) Date of filing: 18.09.2021

(51) International Patent Classification (IPC):  G06K 9/00(2022.01) (52) Cooperative Patent Classification (CPC): G06V 20/54; G06V 10/267; G06V 10/12 (86) International application number: PCT/CN2021/119300 (87) International publication number: WO 2022/217834 (20.10.2022 Gazette 2022/42)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 15.04.2021 CN 202110406602 (71) Applicant: Zhejiang Dahua Technology Co., Ltd. Hangzhou, Zhejiang 310053 (CN)	(72) Inventors: ZHANG, Xingming Hangzhou, Zhejiang 310053 (CN) WANG, Lisheng Hangzhou, Zhejiang 310053 (CN) ZHU, Mengchao Hangzhou, Zhejiang 310053 (CN) WANG, Yayun Hangzhou, Zhejiang 310053 (CN) (74) Representative: Wang, Bo  Panovision IP Ebersberger Straße 3 85570 Markt Schwaben 85570 Markt Schwaben (DE)