轻量级网络端到端矫正识别中文车牌,实时高效。
LPTR-AFLNet: Lightweight Integrated Chinese License Plate Rectification and Recognition Network
- 用识别结果反向指导矫正,提升透视畸变修正精度。
- 双行车牌识别准确率高,在低中端显卡上<10毫秒运行。
- 适合边缘设备部署,解决复杂场景下的车牌识别难题。
中文车牌识别在非受限复杂环境下面临诸多挑战,尤其源于不同拍摄角度导致的透视畸变,以及单行与双行车牌的矫正问题。鉴于边缘设备计算资源有限,开发一种低复杂度、端到端集成的矫正与识别网络对实现实时高效部署至关重要。本文提出一种轻量级统一网络LPTR-AFLNet,结合透视变换矫正模块(PTR)与优化的车牌识别网络AFLNet。该网络利用识别输出作为弱监督信号,有效引导矫正过程,确保透视畸变矫正的准确性。为提升识别精度,对LPRNet引入改进注意力模块以减少相似字符混淆,并采用焦点损失(Focal Loss)缓解训练中的类别不平衡问题。实验表明,LPTR-AFLNet在矫正透视畸变和识别双行车牌图像方面表现优异,可在多种挑战性场景下保持高识别准确率。此外,在低中端GPU平台上,该方法运行时间低于10毫秒,体现了其实际效率与广泛适用性。
原文摘要 · Abstract (English)
Chinese License Plate Recognition (CLPR) faces numerous challenges in unconstrained and complex environments, particularly due to perspective distortions caused by various shooting angles and the correction of single-line and double-line license plates. Considering the limited computational resources of edge devices, developing a low-complexity, end-to-end integrated network for both correction and recognition is essential for achieving real-time and efficient deployment. In this work, we propose a lightweight, unified network named LPTR-AFLNet for correcting and recognizing Chinese license plates, which combines a perspective transformation correction module (PTR) with an optimized license plate recognition network, AFLNet. The network leverages the recognition output as a weak supervisory signal to effectively guide the correction process, ensuring accurate perspective distortion correction. To enhance recognition accuracy, we introduce several improvements to LPRNet, including an improved attention module to reduce confusion among similar characters and the use of Focal Loss to address class imbalance during training. Experimental results demonstrate the exceptional performance of LPTR-AFLNet in rectifying perspective distortion and recognizing double-line license plate images, maintaining high recognition accuracy across various challenging scenarios. Moreover, on lower-mid-range GPUs platform, the method runs in less than 10 milliseconds, indicating its practical efficiency and broad applicability.
Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品;中文卡片由大模型生成,请以原文为准。