论文标题
朝着端到端的汽车牌照位置和在不受约束的情况下的识别
Towards End-to-end Car License Plate Location and Recognition in Unconstrained Scenarios
论文作者
论文摘要
从卷积神经网络的快速发展中受益，汽车牌照检测和识别的性能得到了很大的改善。但是，大多数现有方法分别解决了检测和识别问题，并专注于特定方案，这阻碍了现实世界应用的部署。为了克服这些挑战，我们提出了一个有效而准确的框架，以同时解决车牌检测和识别任务。这是一个轻巧且统一的深神经网络，可以对端到端进行优化，并实时工作。具体而言，对于不受约束的场景，采用了一种无锚方法来有效检测车牌的边界框和四个角，这些框用于提取和纠正目标区域特征。然后，新型的卷积神经网络分支旨在进一步提取字符的特征而不分割。最后，识别任务被视为序列标记问题，这些问题通过连接派时间分类（CTC）解决。选择了几个公共数据集，包括在各种条件下从不同方案中收集的图像进行评估。实验结果表明，所提出的方法在速度和精度上都显着优于先前的最新方法。
Benefiting from the rapid development of convolutional neural networks, the performance of car license plate detection and recognition has been largely improved. Nonetheless, most existing methods solve detection and recognition problems separately, and focus on specific scenarios, which hinders the deployment for real-world applications. To overcome these challenges, we present an efficient and accurate framework to solve the license plate detection and recognition tasks simultaneously. It is a lightweight and unified deep neural network, that can be optimized end-to-end and work in real-time. Specifically, for unconstrained scenarios, an anchor-free method is adopted to efficiently detect the bounding box and four corners of a license plate, which are used to extract and rectify the target region features. Then, a novel convolutional neural network branch is designed to further extract features of characters without segmentation. Finally, the recognition task is treated as sequence labeling problems, which are solved by Connectionist Temporal Classification (CTC) directly. Several public datasets including images collected from different scenarios under various conditions are chosen for evaluation. Experimental results indicate that the proposed method significantly outperforms the previous state-of-the-art methods in both speed and precision.
