13 January 2021 Robust license plate detection and recognition with automatic rectification
Degui Xiao, Lu Zhang, Jianfang Li, Jiazhi Li
Author Affiliations +
Abstract

We propose a robust license plate detection and recognition (LPDR) framework with automatic rectification. We explore the YOLOv2 object detector based on deep learning and train it to detect license plates (LPs) effectively. The LPs in natural scene images tend to be tilted and distorted because of the shooting angle or the geometric deformation of LPs. To solve the problem in which the LP tilt and distortion affect recognition accuracy, we introduce a spatial transformation network with thin-plate-spline transformation and propose a neural network called inverse compositional spatial transformer network-hierarchical spatial transformer network (ICSTN-CRNN). ICSTN-CRNN can automatically rectify and recognize LPs. Furthermore, we manually supplement the LP character annotations in PKUData. Our LPDR method achieves satisfactory results on three datasets, including Chinese City Parking Dataset, PKUData, and application-oriented license plate. Through a series of comparative experiments, we prove that our method is more accurate than other advanced methods.

© 2021 SPIE and IS&T 1017-9909/2021/$28.00© 2021 SPIE and IS&T
Degui Xiao, Lu Zhang, Jianfang Li, and Jiazhi Li "Robust license plate detection and recognition with automatic rectification," Journal of Electronic Imaging 30(1), 013002 (13 January 2021). https://doi.org/10.1117/1.JEI.30.1.013002
Received: 20 May 2020; Accepted: 22 December 2020; Published: 13 January 2021
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CITATIONS
Cited by 7 scholarly publications.
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KEYWORDS
Detection and tracking algorithms

Data modeling

Distortion

Image segmentation

Performance modeling

Convolution

Image processing

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