用生成对抗网络去模糊+YOLOv5检测,提升车牌识别准确率与速度。
A New Hybrid Model of Generative Adversarial Network and You Only Look Once Algorithm for Automatic License-Plate Recognition
- 先用GAN去模糊,再用YOLOv5做车牌检测与识别,流程高效。
- 车牌检测与识别准确率分别达95%和97%,检测仅需0.026秒。
- 对模糊车牌提升近40%准确率,适合移动端实时应用。
自动车牌识别(ALPR)是智慧交通系统的核心组成部分。针对其高变异性问题,本文提出一种结合选择性生成对抗网络(Deblur-GAN)与最新YOLOv5架构的混合模型。该模型在预处理阶段采用Deblur-GAN去除图像模糊,随后利用YOLOv5完成车牌检测(LPD)、字符分割(CS)与字符识别(CR),实现高精度与低计算开销。实验表明,该模型在检测阶段仅需0.026秒,车牌检测准确率达95%,字符识别准确率达97%。引入Deblur-GAN使模糊车牌识别准确率提升近40%。研究还公开了基于伊朗车牌构建的模糊数据集与ALPR数据集,更贴近真实场景。结果证明,该模型在精度与实时性上表现优异,适用于便携式设备部署。
原文摘要 · Abstract (English)
Automatic License-Plate Recognition (ALPR) plays a pivotal role in Intelligent Transportation Systems (ITS) as a fundamental element of Smart Cities. However, due to its high variability, ALPR faces challenging issues more efficiently addressed by deep learning techniques. In this paper, a selective Generative Adversarial Network (GAN) is proposed for deblurring in the preprocessing step, coupled with the state-of-the-art You-Only-Look-Once (YOLO)v5 object detection architectures for License-Plate Detection (LPD), and the integrated Character Segmentation (CS) and Character Recognition (CR) steps. The selective preprocessing bypasses unnecessary and sometimes counter-productive input manipulations, while YOLOv5 LPD/CS+CR delivers high accuracy and low computing cost. As a result, YOLOv5 achieves a detection time of 0.026 seconds for both LP and CR detection stages, facilitating real-time applications with exceptionally rapid responsiveness. Moreover, the proposed model achieves accuracy rates of 95\% and 97\% in the LPD and CR detection phases, respectively. Furthermore, the inclusion of the Deblur-GAN pre-processor significantly improves detection accuracy by nearly 40\%, especially when encountering blurred License Plates (LPs).To train and test the learning components, we generated and publicly released our blur and ALPR datasets (using Iranian license plates as a use-case), which are more representative of close-to-real-life ad-hoc situations. The findings demonstrate that employing the state-of-the-art YOLO model results in excellent overall precision and detection time, making it well-suited for portable applications. Additionally, integrating the Deblur-GAN model as a preliminary processing step enhances the overall effectiveness of our comprehensive model, particularly when confronted with blurred scenes captured by the camera as input.
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