手持无线视频监控系统的设计与实现

随着无线通信的快速发展、无线传输带宽的增大,尤其是3G网络的使用,无线手持移动终端的DSP处理能力不断增强,无线移动终端已可以成为视频采集系统的终端.Windows Mobile是目前移动设备中较为流行的智能终端操作系统.对如何构建远程无线视频采集(监控)系统的关键技术进行深入的研究.并在Windows Mobile平台上实现了该系统.     

基于嵌入式Linux的无线视频传输终端设计

选用ARM9(S3C2410)处理器为硬件平台,嵌入式Linux操作系统为软件平台,采用WLAN方式传输,设计并实现了一个无线视频传输终端.文中提出了一个无线视频系统的总框架,介绍了系统硬件平台和总体结构设计方案,最后对系统进行了测试.     

基于RTP协议的移动视频监控系统的设计

无线移动网络环境稳定性较差,需要研究如何自适应有效带宽的动态变化,以获得最佳的视频监控效果。H．264是高压缩比的视频编解码标准,相同条件下需要的传输带宽更少。RTP/RTCP协议专为实时数据的传输而设计。本系统中,视频采集终端用RTP协议封装和发送H．264数据,用RTCP协议接收网络传输质量信息,自适应调整发送速率;监控平台对收到的数据进行整理和过滤,确保视频图像的正确播放。实验表明该设计在无线移动网络环境下,视频监控效果良好。     

关于移动监控系统平台组成及终端的设计概述

随着社会的发展,视频监控以其直观、方便、信息内容详实而广泛应用于生产和安全等领域,利用无线方式传递视频信号的移动视频监控系统是该领域的一个研究热点。基于AT89S52单片机提出了一种移动远程图像监控终端系统的设计方案,终端利用GPRS定位系统进行通信。终端硬件主要包括主控部分、摄像头部分、网络传输控制部分以及GPS定位部分。硬件设计中通过增加储能电容以及合理的PCB布线可以解决GPRS模块数据发射中大脉冲电流干扰问题;通过增加外部看门狗保证了系统运行可靠性。     

基于ARM的远程无线视频监控终端设计

提出了一种以ARM微处理器为拉制核心的远程无线视频监控终端的设计方案,其监控终端的硬件设计包括视频采集处理、中央管理控制、无线传输3个模块.并给出了监控终端的软件开发平台和开发模式的系统启动代码、嵌入式Unux系统移植以及驭动程序和应用程序.测试结果表明,该监控终端设计方案合理、有效,基本满足监控需求.     

车载双模无线视频监控系统的设计与实现

设计并实现了一种基于WCDMA和CDMA2000 EVDO无线3G网络的车载式双模无线视频监控系统。介绍了车载式视频监控终端嵌入式设备的整体硬件结构,以及相应功能模块定义和说明。从系统总体结构、主要流程图和关键技术等方面详细描述了监控中心的软件实现。测试结果表明,该车载式监控系统充分利用WCDMA和CDMA2000 EVDO双模网络进行数据传输,相比于传统单模视频传输系统,有效提高了视频传输质量。     

一种宽带无线移动视频调度系统的设计与实现

无线宽带接入技术的发展已具备将传统窄带语音集群调度系统与宽带视频调度集成应用的技术基础.本文提出一种宽带无线移动视频调度系统的设计,无缝整合无线移动视频与原有固定视频监控系统[1],不但实现指挥中心对无线作业终端的统一音、视频调度通信管理,而且提供可自定义的、基于事件触发与时间触发的音、视频联动调度机制.该系统具备优异的灵活性与可扩展性,尤其适合突发与应急状态下的联动调度通信应用,满足民航机场等行业的运营指挥业务需要.     

3G移动终端流媒体播放技术的研究

3G网络通信数据增值业务的迅速发展,使得无线流媒体应用越来越受到人们的关注。因此在移动网络环境中,针对手机终端的流媒体解码播放技术正成为研究热点。在对3G网络中移动终端的视频解码技术进行探讨基础上,设计了从PC端向移动终端发送音、视频内容的无线流媒体的具体应用系统,实现了在Symbian平台手机终端的H.264协议的解码播放,解码效果良好基本满足实时解码的要求。     

基于多模组3G视频传输终端的硬件设计与仿真

针对3G模块无线视频监控通信中出现的缺陷,通过USB硬件扩展方式实现了一种基于S3C2440为核心的多模组3G无线视频传输终端硬件平台系统.构建了硬件电路的总体架构,并阐述了关键功能的实现方法,最后使用Candence仿真软件对设计进行了仿真.在设计仿真中同时给出了硬件设计中的SI问题的控制措施.实验表明,该硬件平台能...     

基于无线传输的移动视频监控系统的设计

介绍了一种基于3G无线网络传输的移动视频监控系统的设计和实现方法.首先分析了本视频监控系统的优点,并简单介绍了系统的总体设计,然后重点介绍了前端采集终端、传输部分和后端管理平台等部分的设计和实现方法,最后分析了测试效果和下一步研究重点.经3G网络测试,该监控系统工作稳定并已成功应用于视频监控领域.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first