基于卷积神经网络的道路多目标检测方法

得益于数字图像处理技术快速的发展和计算机硬件性能的提高,基于机器学习和深度学习的图像处理技术,成为智能驾驶视觉感知的重要支撑。为了在实际道路环境中持续高效的检测道路目标,文章利用了YOLO神经网络作为主要检测框架。使用卷积神经网络可以同时捕捉到目标的底层和高层特征。物体的底层特征可以符合人的视觉感知特征和主观感受,确定物体的所属种类和外观形状,将底层特征与高层语义特征结合进一步增强神经网络识别的准确度和鲁棒性。     

Multi-modal traffic signal control with priority,signal actuation and coordination

Both coordinated-actuated signal control systems and signal priority control systems have been widely deployed for the last few decades. However, these two control systems are often conflicting with each due to different control objectives. This paper aims to address the conflicting issues between actuated-coordination and multi-modal priority control. Enabled by vehicle-to-infrastructure (v2i) communication in Connected Vehicle Systems, priority eligible vehicles, such as emergency vehicles, transit buses, commercial trucks, and pedestrians are able to send request for priority messages to a traffic signal controller when approaching a signalized intersection. It is likely that multiple vehicles and pedestrians will send requests such that there may be multiple active requests at the same time. A request-based mixed-integer linear program (MILP) is formulated that explicitly accommodate multiple priority requests from different modes of vehicles and pedestrians while simultaneously considering coordination and vehicle actuation. Signal coordination is achieved by integrating virtual coordination requests for priority in the formulation. A penalty is added to the objective function when the signal coordination is not fulfilled. This “soft” signal coordination allows the signal plan to adjust itself to serve multiple priority requests that may be from different modes. The priority-optimal signal timing is responsive to real-time actuations of non-priority demand by allowing phases to extend and gap out using traditional vehicle actuation logic. The proposed control method is compared with state-of-practice transit signal priority (TSP) both under the optimized signal timing plans using microscopic traffic simulation. The simulation experiments show that the proposed control model is able to reduce average bus delay, average pedestrian delay, and average passenger car delay, especially for highly congested condition with a high frequency of transit vehicle priority requests.     

电子海图实时平滑旋转实现方法研究

首先给出了电子海图旋转时,动态标注各种注记的方法以及排列向量的定义,然后介绍了实现电子海图实时平滑旋转的技术途径.通过尽量减少不必要的绘制、将图形绘制数据与其它海图数据分离和不直接针对目标显示窗口进行绘图三种策略的运用,实现了电子海图平滑旋转时,海图绘制和显示的高效率.