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License plate detection and recognition based on YOLOv3 and ILPRNET

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Abstract

This paper is concerned with the detection and recognition of Chinese license plates in complex backgrounds. Most applications are currently focused on good conditions. In complex natural scenes such as CCPD-DB, CCPD-FN, CCPD-Rotate, CCPD-Tile, CCPD-Weather, and CCPD-Challenge from the Chinese City Parking Dataset (CCPD), inaccurate localization and poor character recognition accuracy issues appear towards existing license plates. Therefore, this paper proposes a two-stage license plate recognition algorithm based on YOLOv3 and Improved License Plate Recognition Net (ILPRNET). In the first stage, YOLOv3 is adopted to detect the position of the license plate and then extract the license plate. In the second stage, the ILPRNET license plate recognition network is used to perform localization of license plate characters and the 2D attentional-based license plate recognizer with an CNN encoder is capable of recognizing license plates accurately. The test results indicate that our proposed algorithm performs well in a variety of complex scenarios. Especially in sub-datasets like CCPD-Base, CCPD-DB, CCPD-FN, CCPD-Weather, and CCPD-Challenge, the recognition accuracy achieved 99.2%, 98.1%, 98.5%, 97.8%, and 86.2%, respectively.

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Acknowledgements

This work was supported by 2017 Zhuhai introduces innovation and entrepreneurship team (ZH01110405170027PWC, No.ZH0405-1900-01PWC) and Cloud Service Platform and Applications based on “ZHUHAI No.1” Constellation & Remote Sensing Big Data.(ZDXK[2018]007), Key Supported Disciplines of Guizhou Province-Computer Application Technology (No. QianXueWeiHeZi ZDXK [2016]20), and the work was also supported by National Natural Science Foundation of China (61462013, 61661010)

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Authors and Affiliations

  1. Key Laboratory of Intelligent Medical Image Analysis and Precise Diagnosis of Guizhou Province, College of Computer Science and Technology, Guizhou University, Guiyang, 550025, China

    Yongjie Zou & Yongjun Zhang

  2. Zhuhai Orbita Aerospace Science and Techology Co, Ltd, Oribita Tech Park, 1 BaiSha Road, TangJia DongAn, ZhuHai, 519000, China

    Jun Yan, Xiaoxu Jiang, Tengjie Huang & Haisheng Fan

  3. Big Data Science and Intelligent Engineering Research Institute, Guizhou Education University, Guiyang, 550018, China

    Zhongwei Cui

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  1. Yongjie Zou
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  2. Yongjun Zhang
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  4. Xiaoxu Jiang
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  7. Zhongwei Cui
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Correspondence to Yongjun Zhang or Jun Yan.

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Zou, Y., Zhang, Y., Yan, J. et al. License plate detection and recognition based on YOLOv3 and ILPRNET. SIViP 16, 473–480 (2022). https://doi.org/10.1007/s11760-021-01981-8

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  • DOI: https://doi.org/10.1007/s11760-021-01981-8

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