High-speed road sign detection scheme based on ultrafast single-pixel scanning LiDAR

High-speed light detection and ranging (LiDAR) is of great significance for road sign detection in the vehicle travel process, and ultimately for futuristic automatic driving. The current vehicle -borne LiDAR techniques, such as optical phased array radar and solid-state LiDAR, are challenging in assisting fully automated driving, due to its limitation of slow responsibility. Here, we propose a high-speed road sign detection system based on ultrafast single -pixel scanning LiDAR. A serial time -encoded imaging module is used for detecting and processing the road sign information. The continuous scanning -based imaging permits a temporal response of ns-level and a point rate of 370 M p/s. A position index algorithm is employed to rectify the distortions for improving the reconstructed image quality. Experimentally, we obtain a 2D image of the object with an angular resolution of 0.032 degrees, which can be optimized to 0.0057 degrees after process simulation and parameter optimization. Experimental ranging measurement for multiple distances are performed based on time -of -flight, and a ranging error of 4 mm is obtained. Besides, we demonstrate the ability to recognize real road sign. This scheme may provide a potential scheme for the traffic environment perception of the future autonomous vehicle.