基于解码盒协议的多终端视频监控研究设计

传统的视频监控设计方案只实现PC终端或移动终端其中一个,不能同时满足PC终端和移动终端用户对视频监控服务的需求。而本文在PC视频监控基础上增加解码盒。首先通过视频监控系统来连接设备,将设备中数据解码。再通过Socket协议将数据传输给以S3C6410X和linux嵌入式操作系统为基础的移动终端。最后播放器通过列队方式读取数据,达到在线播放的效果。这样很好地解决以上需求。     

基于红外图像的SF6检漏定位系统

设计与开发了一种基于红外图像的SF6气体检漏定位系统.本系统利用TMS320C6416高速图像处理能力及其灵活可配置的视频端口,结合S3C6410强大的控制能力,对可能发生SF6泄漏的现场进行红外视频图像的实时采集,利用帧间差分和局部熵差相结合的算法对泄漏点进行检测和定位.仿真及实验结果表明,该算法不仅克服了帧间差分法...     

基于WIA无线网络技术的热网计量监测系统的应用

主要介绍基于GPRS/3G无线网络传输技术的热网无线计量监测系统。该系统利用基于WIA技术的EDC无线数据采集设备集成现场仪表数据,通过无线网络将数据传输至热网计量监测软件平台,实现对热网系统的实时运行监测与高效管理。并结合案例详细描述该系统在热网监测领域的应用情况与优势。     

便携式红外电路故障检测系统

针对基于PC的红外电路故障检测系统便携性差的缺点,提出了基于ARM11的便携式红外电路故障检测系统.异常电路板的热图像经红外CCD采集后,利用视频解码芯片TVP5150对热图像信号进行图像格式转换,再将热图像数据传至S3C6410核心处理器,采用图像处理算法对热图像进行图像处理,最后与标准的热图像对比并得到故障诊断结果...     

滚动轴承试验机远程监测系统的设计与应用

利用虚拟仪器、数据库和无线网络技术设计开发基于C/S与B/S混合结构的滚动轴承远程监测系统,整个系统由下位机实时监测子系统、上位机监测诊断子系统以及两者的数据通信3部分组成,能够满足实时数据的获取与处理(尤其是大型二进制数据的存储问题)、异常数据的筛选与上传以及远程用户的信号分析和故障诊断等工作。对6309深沟球轴承的全寿命周期试验结果表明:该系统能够实时监测轴承的运行状态,并通过对筛选后的异常数据进一步分析得到故障原因和故障部位,具有较高的实用价值。     

基于多通信方式的烟草仓库监测系统网关的设计

在基于无线传感器网络的环境监测系统中,传感节点获取的信息需要通过网关设备与外网进行互连以实现数据的长距离传输,使用单一的通信方式的网关已经不能够满足现代仓库对于监测和管理的具体需要。系统基于ARM11系列的S3C6410微控制器,综合ZigBee的无线传感器网络技术、以太网技术、CDMA2000等通信技术,通过移植嵌入式Linux操作系统,在此基础上开发相应的驱动程序、应用程序和管理接口,并运用线程池技术控制各通信方式并行执行,来实现具有多种通信方式的网关。结果表明,该网关具有工作稳定性好,传输数据可靠性高,适用性强、灵活方便等优点,可以实现复杂环境下的信息传输。     

基于ARM11的海洋浮标云台稳定控制系统

由于载体姿态的变化和海浪等因素的影响,海洋浮标成像系统所获得的图像不稳定或者模糊,如何改变现状是人们不断探讨和研究的课题。结合陀螺传感器MPU6050和磁力计HMC5883L设计一套基于ARM11的云台稳定控制系统,通过S3C6410的I2C接口读取MPU6050和HMC5883L的数据,采用卡尔曼滤波算法对其进行处理,然后解算出载体的航向角和俯仰角,实现云台摄像机姿态的反向调整。当云台摄像机与PC相连时,对Ulead Video Studio软件进行简单的配置,便可看到云台摄像机所拍摄的视频信息。实验结果表明:云台将以水平速度280°/s、垂直速度100°/s完成反向偏转,最长反馈调整时间为0.38 s,满足工程上的应用需求;该系统电路结构简单、成本低、可视化且稳定,可以移植到无人机及船舶监控等场合,具有一定的实用性。     

基于视频图像技术的变电站智能化应用系统研究

随着视频分析识别技术和数据处理方法的不断成熟,其在电力行业监控领域正在逐步应用推广,结合变电站视频数据应用特色,本文搭建了一套基于视频图像技术的变电站智能化应用系统.该系统采用B/S架构,客户端WEB界面智能化应用请求,通过ICE中间件实现信令和数据交互,总线服务程序根据不同应用请求分发数据,各专项服务程序根据数据消息进行分析判定,最终实现智能化应用功能.系统主要具有以下几个特色:用于辅助变电站综自系统的刀闸状态视频校核;协助在线监测装置故障数据分析结果的视频图像遥视联动功能;变电站现场作业人员违章安全监管预警.应用表明:本系统方案能够很好地提升变电站智能化应用水平.     

基于ARM7的移动智能车辆稽查系统的设计

移动智能车辆稽查系统以ARM7为核心,集成了视频采集、GPS定位、无线网络传输等硬件模块,并利用基于ADS集成开发环境的嵌入式软件开发平台进行了系统软件设计。通过软硬件协同设计实现了实时视频图像采集、智能车牌识别、GPS定位以及无线网络传输等功能,满足交通稽查部门对违规车辆不停车稽查的要求。     

基于ARM11的智慧无人泊车系统设计与实现

设计一个智慧无人泊车系统,智能地实现无人驾驶汽车、自动确定空车位、自动停泊车位等功能。本系统主要使用物联网及嵌入式技术。本设计实现中采用基于ARM11的S3C6410和8051单片机两种CPU实现主控功能,使用RFID及红外传感器实现位置信息采集,使用无线通信技术实现信息交互,并利用实验板进行演示验证。研究结果对构建智慧停车场和智慧汽车的设计具有一定的指导意义。     

与图像有关的无线通信标准

有线的Internet与无线的移动通信网络有着截然不同的传输环境。3G虽然也定义了图像标准，但其所支持的视频业务标准并没有确定，这也将影响其普及和应用。     

Analysis of Wireless Backhaul Networks Based on Aerial Platform Technology for 6G Systems

As next generation communication technologies emerge, new high data rate applications and high-definition large-screen video streaming have become very popular. As a result, network traffic has been increasing so much that existing backhaul networks soon will not be able to support all traffic demands. To support these needs in future 6G mobile systems, the establishment of an additional backhaul wireless network is considered essential. As one of the solutions, a wireless backhaul network based on an aerial platform has been proposed. In order to explore the potential of aerial platforms as wireless backhaul networks, in this paper, the categories for wireless backhaul networks based on aerial platforms are investigated. This paper includes a survey of the definitions and characteristics of low altitude platforms (LAPs) and high altitude platforms (HAPs), as well as channel models according to the atmosphere. For wireless backhaul network designs based on aerial platforms, altitude and platform selection options, deployment options, energy issues, and security based on target location and performance were considered in the analysis and investigation.     

Authentication mechanism over the integrated UMTS network and WLAN platform using the cross-layer bootstrap

The 3G mobile data network provides always-on and ubiquitous connectivity for subscribers. Although the service coverage area in wireless local area network (WLAN) is much smaller than that in a 3G mobile data network, the data transmission rate in WLAN can be from 2 to 54 Mbps, which is much faster than 3G mobile network. Obviously, the relationship between the 3G mobile data network and WLAN is complementary in terms of service coverage and data transmission rate. Therefore integration of 3G mobile network and WLAN can offer subscribers higher speed wireless service in hot spots and ubiquitous connectivity in 3G mobile data network. An authentication mechanism over the loose coupled integration mechanism using a cross-layer bootstrap is proposed. The benefits of the proposed mechanism are (a) integrating Universal Mobile Telecommunication System network and WLAN using the existing protocols denned in 3GPP, IETF and IEEE 802. Hi, (b) the use of the Extension Authentication Protocol authentication method is flexible, (c) reduction of the authentication signalling when a subscriber roams from one access point (AP) to another AP and (d) user identity privacy protection.     

Mutually connected phase-locked loop networks: dynamical models and design parameters

Distribution of timing signals is an essential factor for the development of digital systems for telecommunication networks, integrated circuits and manufacturing automation. Originally, this distribution was implemented by using the master?slave architecture with a precise master clock generator sending signals to phaselocked loops (PLL) working as slave oscillators. Nowadays, wireless networks with dynamical connectivity and the increase in size and operation frequency of the integrated circuits suggest that the distribution of clock signals could be more efficient if mutually connected architectures were used. Here, mutually connected PLL networks are studied and conditions for synchronous states existence are analytically derived, depending on individual node parameters and network connectivity, considering that the nodes are nonlinear oscillators with nonlinear coupling conditions. An expression for the network synchronisation frequency is obtained. The lock-in range and the transmission error bounds are analysed providing hints to the design of this kind of clock distribution system.     

包装车间数字化无线视频监控系统的研究与实现

传统的模拟视频监控系统具有成本高,需要铺设专用线路,无法联网,存储量大等特点.随着网络技术和图像处理技术的发展,无线视频监控系统得到了广泛应用.介绍了基于WLAN的远程无线数字视频监控系统的组成、原理及实现方法,阐述了实现无线监控系统的关键技术.最后结合实际情况,给出了监控系统在包装车间的实现.     

Cluster-Based Stable BSM Dissemination System for Safe Autonomous Platooning

Recently, the importance of vehicle safety supporting system has been highlighted as autonomous driving and platooning has attracted the researchers. To ensure driving safety, each vehicle must broadcast a basic safety message (BSM) every 100 ms. However, stable BSM exchange is difficult because of the changing environment and limited bandwidth of vehicular wireless communication. The increasing number of vehicles on the road increases the competition to access wireless networks for BSM exchange; this increases the packet collision rate. An increased packet collision rate impairs the transmission and reception of BSM information, which can easily cause a traffic accident. We propose a solution, the vehicular safety support system (V3S), which exchanges BSMs reliably even when many vehicles are on the road. The V3S uses a clustering scheme to decrease network traffic by reducing the amount of data exchanged between a vehicle and the roadside unit (RSU). In addition, the V3S reduces the collision rate of wireless network packets by broadcasting the vehicle's BSM in an allocated timeslot using the time division multiple access (TDMA) MAC protocol. The V3S also deals with insufficient bandwidth for dedicated short-range communications (DSRC) by changing DSRC channels according to traffic flow. In evaluating the packet error rate for stable BSM packet delivery, the V3S demonstrates an excellent packet error rate of less than 1%, compared to the 802.11p with its packet error rate of 82%.     

Traffic scheduling for multimedia transmission over IEEE 802.11e wireless LAN

As the demand for broadband multimedia wireless is increasing, improving the quality of service (QoS) of the widely deployed IEEE 802.11 wireless LAN has become crucial. In order to attain the QoS required by a wide range of applications, the IEEE 802.11 working group has denned a new standard - the IEEE 802.lie. However, very limited work has been performed to address the QoS transmission problem of real-time video over IEEE 802.11e. A novel measurement-based dynamic transmission opportunity (MBDTXOP) scheme is proposed, which adaptively allocates resources to a variable bit rate (VBR) video on the basis of the estimation of future traffic demand to support efficient QoS transmission of VBR video. The novelty of the proposed scheme, when compared with existing methods, lies in estimating the required network resources by exploiting the characteristics of digital video; this capability enables the MBDTXOP scheme to substantially increase network utilisation while preserving the required QoS for the transmission of VBR video. Simulations comparing the proposed scheme with other mechanisms clearly demonstrate the outstanding performance of the former.