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1. WO2020133464 - SYSTEMS AND METHODS FOR LICENSE PLATE RECOGNITION

Publication Number WO/2020/133464
Publication Date 02.07.2020
International Application No. PCT/CN2018/125762
International Filing Date 29.12.2018
IPC
G06K 9/00 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
9Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
CPC
G06K 2209/15
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
2209Indexing scheme relating to methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
15Detection and recognition of car license plates
G06K 9/00785
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
9Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
00624Recognising scenes, i.e. recognition of a whole field of perception; recognising scene-specific objects
00785Recognising traffic patterns acquired by static cameras
G06K 9/3275
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
9Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
20Image acquisition
32Aligning or centering of the image pick-up or image-field
3275Inclination (skew) detection or correction of characters or of image to be recognised
Applicants
  • ZHEJIANG DAHUA TECHNOLOGY CO., LTD. [CN]/[CN]
Inventors
  • CHEN, Yichao
  • WANG, Yaonong
  • YIN, Jun
Agents
  • METIS IP (CHENGDU) LLC
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEMS AND METHODS FOR LICENSE PLATE RECOGNITION
(FR) SYSTÈMES ET PROCÉDÉS DE RECONNAISSANCE DE PLAQUE D'IMMATRICULATION
Abstract
(EN)
A system and method for license plate recognition may be provided, the method may include obtaining an image including a license plate mounted on a vehicle, and identifying at least one feature point associated with the vehicle. The method may also include determining an approximate angle range within which a tilt angle of the license plate is located based on the at least one feature point, and determining the tilt angle of the license plate within the approximate angle range. The method may further include performing a tilt correction on the license plate based on the tilt angle of the license plate.
(FR)
L'invention concerne un système et un procédé de reconnaissance de plaque d'immatriculation, le procédé pouvant consister à obtenir une image comprenant une plaque d'immatriculation montée sur un véhicule, et à identifier au moins un point caractéristique associé au véhicule. Le procédé peut également consister à déterminer une plage d'angle approximatif à l'intérieur de laquelle un angle d'inclinaison de la plaque d'immatriculation est situé sur la base du ou des points caractéristiques, et à déterminer l'angle d'inclinaison de la plaque d'immatriculation à l'intérieur de la plage d'angle approximatif. Le procédé peut en outre consister à effectuer une correction d'inclinaison sur la plaque d'immatriculation sur la base de l'angle d'inclinaison de la plaque d'immatriculation.
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