基于OpenCV的ARM嵌入式网络视频监控系统

详细描述了在ARM-Linux嵌入式系统中移植OpenCV的方法,并在OpenCV的基础上运用Surendra算法设计了一个结合监控和运动目标跟踪功能的网络视频监控系统.     

基于OpenCV的视频图像处理应用研究

以嵌入式ARM为硬件平台,以ARM-Linux为软件平台,在QT/Qtopia图形用户界面下,通过调用OpenCV图形处理库设计摄像头应用程序,最终实现把摄像头采集到的视频流数据显示在Qtopia图形用户界面窗体上.介绍了QT编程的基本原理,阐述了OpenCV图像处理库的工作机制与使用方法.     

基于MMS的嵌入式无线视频报警系统

针对传统报警系统存在直观性差、虚警率高和不易安装等问题，设计了一种新型的无线视频报警系统，给出了软硬件解决方案。该系统结合了MMS的嵌入式技术、无线网络通信技术和多媒体技术，克服了传统报警系统所存在的缺陷，提高了报警的及时性和准确性。目前此系统已投入实际应用。     

基于OpenCV的可变分辨率嵌入式监控系统设计

本文根据OV9650摄像头分辨率设置特点,提出了一个基于OpenCV的可变分辨率嵌入式监控系统设计方案。利用OpenCV对采集到的图像实时进行人形检测处理,根据检测结果控制摄像头工作分辨率,实现了高分辨率采集异常情况图片,低分辨率采集正常情况图片的实时智能监控。     

嵌入式网络管理报警系统的设计

随着信息化建设的日益深入,网络规模越来越大,网络故障和性能问题也变得难以判断,对网络管理软件的需求日益迫切。但目前的网络管理软件存在着价格昂贵、实施困难等问题。该文开发了嵌入式网络管理报警系统,该系统可以方便地部署在重要的网络环境中,能够通过短信的方式将报警信息通知网络管理员。并且给出了系统进一步完善的方向。     

基于DSP的嵌入式车道偏离报警系统的硬件平台

目前普遍采用的车道偏离报警系统的硬件平台是工业PC.为了克服其体积大、功耗高、成本高、可靠性低的缺陷,设计了一种嵌入式车道偏离报警系统的硬件平台.利用基于DM642系统作为视频采集处理模块,采用C8051F040的数据采集系统作为汽车行驶参数采集模块,使用基于LM2576的电源系统为整个系统供电模块.试验表明,该系统具有良好实时性和抗干扰能力,满足了系统设计需要.     

单片机嵌入式以太网防盗报警系统

在对现有的防盗报警系统进行研究后,提出一套用8051单片机、以太网控制芯片、红外探头及计算机构成的防盗报警系统。监控中心内的计算机通过以太网与防盗报警系统前端进行连接,通过在8051单片机上运行TCP/IP协议来实现单片机与计算机间的数据传输,达到监控计算机通过以太网实现对分布于各地的防盗报警系统前端进行监控和管理的目的。     

基于集群通讯的车辆监控报警系统

根据车辆监控的需求 ,给出基于集群通讯网的移动车辆GPS定位的网络化调度、报警、处警控制系统的设计和结构。本系统在北京市某金融系统已实际使用 ,效果良好     

联防式智能型防盗报警系统的研制

介绍了联防式智能型防盗报警系统的硬件和软件设计方法，由于系统采用了“联防”的设计思想，从而克服了当今常见的防盗报警系统的“主机－从机”结构带来的弊端。     

嵌入式系统在铁路道口报警系统中的应用

本文介绍的嵌入式系统在铁路平交道口自动报警系统中应用,采用微软的WindowsCE操作系统,基于PC/104总线的PCM3350主机和PCM3724硬件平台,上位机采用组态软件MCGS所开发的嵌入版。     

Performance evaluation of decision making strategies for an embedded lane departure warning system

An on‐board lane departure warning system embedded in a vehicle is composed of a localization module and a decision making module. The decision making module detects unintended lane departure so as to warn the driver of the danger. The performance of a decision making module is crucial to the performance of the total embedded system. This article proposes two heuristic decision making strategies: a lateral offset (LO) based strategy and a time‐to‐lane crossing (TLC) based strategy. The performance criteria of decision making strategies are proposed as: (1) false alarm rate, and (2) alarm triggering time (ATT). Numerical parameters of both strategies are optimized through numerical simulation, taking the performance criteria into consideration. The proposed strategies are incorporated into the prototype system and evaluated in real expressway experiments. The comparative study of both methods with experimental results shows the applicability of the on‐board lane departure warning system. © 2002 Wiley Periodicals, Inc.     

Innovative lane detection method to increase the accuracy of lane departure warning system

Multimedia Tools and Applications - Lane departure warning is one important feature in Advanced Driver Assistance Systems (ADAS), which aims to improve overall safety on the road. However,...     

Applying fuzzy method to vision-based lane detection and departure warning system

As the high growth of population of vehicles, the traffic accidents are becoming more and more serious in recent years. Most occurrences of the car accidents results from the distraction, inattention and driving fatigue of the driver. Hence, in order to avoid the driver being in danger as much as possible. In the lane detection, in order to enhance lane boundary information and to suitable for various light conditions all day, we combine the self-clustering algorithm (SCA), fuzzy C-mean and fuzzy rules to process the spatial information and Canny algorithms to get good edge detection. In the lane departure warning, the system uses instantaneous information from the lane detection to calculate angle relations of the boundaries. The system sends a suitable warning signal to drivers, according to degree different of the departure. These experiments have been successfully evaluated on the PC platform of 3.2-GHz CPU and the average frame rate is up to 14 fps.     

基于视频的高速车道偏离预警系统

在驾驶过程中发生非意识车道偏离时,偏离预警系统采用报警方式保障行车安全。针对高速公路频发的车道偏离事故,设计和实现了基于视频处理的高速车道偏离预警系统(Highway Departure Warning System,HDWS)。算法处理上,分别进行感兴趣区域(Area of Interest,AOI)设定、图像预处理和Otsu自适应阈值二值化,应用直线模型和改进Hough变换提取车道线,采用像素距离与车道线斜率信息融合的偏离决策,并在MATLAB R2015a上仿真测试。仿真结果表明,该系统能提前1.2 s报警,准确率高于95%,漏报率低于3%,满足高速道路环境下偏离预警性能要求。     

单目视觉车道偏离预警系统的开发

车道偏离预警系统的主要任务是当驾驶员在驾驶过程中非意识发生车道偏离时,采用预警的方式来保障完成汽车的安全。采用基于机器视觉的方法,设计了一款用单个摄像机采集道路信息,用TMS320DM642作为主处理器对采集到图像进行预处理并提取车道线,然后结合汽车CAN总线传输的汽车当前的状态信息进行预警决策。硬件方面,双片SDRAM对图像进行高速缓存以解决视频数据量大的问题,TVP5150对采集到的图像进行解码为后续图像处理提供数据,SAA7121对图像数据进行编码以实现实时视频显示。算法方面,首先对图预处理后,依据道路特征设定感兴趣区域,使用改进Hough变换提取车道线的线形特征。结果证明,本系统采用单目可以降低成本,算法可以很好地移植,能够提前2.5 s进行偏离预警,达到实时性要求。     

车道偏离预警系统关键技术设计

车道偏离系统是一种安全辅助驾驶系统,针对传统车道偏离预警系统实时性不足,设计了基于改进Sobel算法和Hough变换识别车道线的实时车道偏离预警系统。系统将摄像机采集的道路图像经过改进Sobel算法处理,能更快得到车道线边缘像素信息,再应用Hough变换连接有效边缘像素确定车道线位置,最后通过与预警决策模块的匹配度实现车道偏离的预警判定。经测试系统性能良好。     

Driver steering assistance for lane departure avoidance

In this paper, a steering assistance system is designed and experimentally tested on a prototype passenger vehicle. Its main goal is to avoid lane departures when the driver has a lapse of attention. Based on a concept linking Lyapunov theory with linear matrix inequalities (LMI) optimization, the following important features are ensured during the assistance intervention: the vehicle remains within the lane borders while converging towards the centerline, and the torque control input and the vehicle dynamics are limited to safe values to ensure the passengers’ comfort. Because the steering assistance takes action only if necessary, two activation strategies have been proposed. Both activation strategies were tested on the prototype vehicle and were assessed as appropriate. However, the second strategy showed better reactivity in case of rapid drifting out of the lane.     

逆透视投影下车道偏离时间的在线估计

提出了一种基于图像逆透视变换后的车道偏离时间的实时在线估计算法。该算法先对道路图像进行预处理,得到二值化的道路图像,然后通过逆透视变换方法消除图像的透视效果,用Hough变换方法检测车辆所在车道的左右道路标志线,最后估算车辆偏离车道的时间,判定车辆是否会偏离车道。对该算法进行了详细介绍并给出了实验结果,结果表明该算法能够准确地判断车道偏离。     

结合机器视觉的车道偏离识别算法研究

首先确定车道偏离检测的目标区域,然后利用数字图像处理技术及多种算法进行处理,将推算出的左右车道线夹角作为判别车辆是否偏离车道行驶的预警依据。实验结果表明,该算法具有较好的稳定性和一定的应用价值。     

嵌入式气象预警信息接收系统的设计与实现

设计了一种基于ARM920T微处理器和GPRS网络的无线气象预警信息接收系统。该系统采用GPRS作为信息接收的桥梁,通过短消息业务接收气象预警信息,利用嵌入式Linux操作系统资源和图形开发库QT／E实现气象预警信息的显示、语音播报。该方案有效地缩短了接收延迟时间,提高了预警信息接收的有效性,避免了传统的气象预警接收方式无法及时应对突发性气象灾害的情况。