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1. (WO2018121006) METHOD AND DEVICE FOR LICENSE PLATE POSITIONING

Pub. No.:    WO/2018/121006    International Application No.:    PCT/CN2017/106661
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Oct 19 01:59:59 CEST 2017
IPC: G06K 9/32
Applicants: HANGZHOU HIKVISION DIGITAL TECHNOLOGY CO., LTD.
杭州海康威视数字技术股份有限公司
Inventors: CAI, Xiaohui
蔡晓蕙
Title: METHOD AND DEVICE FOR LICENSE PLATE POSITIONING
Abstract:
Provided in embodiments of the present application are a method and device for license plate positioning. The method comprises: a license plate image to be positioned is acquired; the license plate image to be positioned is transmitted to a target network used for license plate positioning, the target network comprising a feature extraction layer and a regression layer; the feature extraction layer extracts an eigenvalue of the license plate image to be positioned and transmits the eigenvalue to the regression layer; a combination of a license plate frame area and a license plate character area produced by the regression layer on the basis of the eigenvalue is acquired; and a license plate area of the license plate image to be positioned is determined on the basis of a positioning area corresponding to the acquired combination. The target network is trained in advance with sample license plate images, the sample license plate images comprise positive sample license plate images, and the positive sample license plate images comprise combinations of license plate frame areas and license plate character areas. The application of the solution provided in the embodiments of the present application increases the accuracy of a license plate positioning process.