Recently, cameras with sensing technology have been used in vehicles to prevent traffic accidents. Although vehicle drivers can visually notice road signs, a recent study developed a recognition system for road signs to prevent traffic accidents. However, this system does not always perform the intended operation and encounters issues if the vehicle is driven at night, the road environment is bad, or the sign is discolored due to aging. Furthermore, the death rate due to speed violations at night is higher compared with that due to other traffic violations. The drivers and existing systems may have difficulties recognizing these signs as they are susceptible to other lights on the roads, such as traffic lights, streetlights, and vehicle headlights at night. Therefore, we propose a recognition method for speed limit signs that are difficult for drivers to recognize at night. In addition, the proposed method is applied to recognize vehicle entry prohibition signs at night. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

---

限速标志的识别方法及其在夜间车辆出入禁止标志识别中的适用性

近来，具有传感技术的相机已被用于车辆中以防止交通事故。尽管车辆驾驶员可以从视觉上注意到道路标志，但最近的一项研究开发了道路标志识别系统，以防止交通事故。然而，如果车辆在夜间驾驶，道路环境恶劣或标志由于老化而变色，则该系统并不总是执行预期的操作，并且会遇到问题。此外，与其他交通违例相比，夜间违反速度造成的死亡率更高。驾驶员和现有系统可能难以识别这些标志，因为它们容易受到道路上其他信号灯的影响，例如交通信号灯，路灯和夜间的车辆前灯。因此，我们提出了一种限速标志的识别方法，这种方法在夜间很难使驾驶员识别。另外，所提出的方法适用于在夜间识别车辆进入禁止标志。©2020日本电气工程师学会。由Wiley Periodicals LLC发布。