基于ARM11和Linux的网络视频监控系统

论述了一种基于ARM11和Linux平台的网络视频监控系统实现方案。介绍了网络视频监控系统的总体架构,重点论述了视频Web服务器的硬件和软件设计,包括服务器的硬件结构、Linux的移植以及MJPG-streamer的移植。该系统采用B/S模式,以高性能的S3C6410处理器作为视频Web服务器;视频监控终端可以是手机和平板PC等移动终端,也可以是PC等固定终端,采用有线或者无线的方式进行实时视频监控。测试结果表明,系统运行稳定可靠,固定终端和移动终端获取的实时视频图像清晰流畅,无失真和抖动现象,取得了较好的实时视频监控效果。     

集成GPRS服务的移动警务应用系统

警务系统包括Web?GIS服务器、移动终端、监控服务器、GIS服务器。警务管理人员可以通过Web?GIS服务器显示和监控整个辖区内警员和案件信息;巡警可以通过终端设备来查询和上报位置和案件信息;而监控服务器提供网络监控,根据信息请求分派到相应的服务平台去;GIS服务器提供地图信息的服务。系统总体设计移动警务网格化应用系统选择.NET平台,移动终端采用WinCE.NET嵌入式操作系统,操作系统适配层定义为适合多种操作系统中间件,向上层提供与操作系统无关的标准封装接口;浏览服务管理程序采用ASP.NET技术开发,运行环境是IIS;警务监控…     

无线Mesh网络视频监控系统客户端软件设计

结合无线Mesh网络(WMN)技术的特性,提出了一种基于Mesh网络的视频监控系统应用方案。利用DirectShow技术开发了基于WMN的视频监控系统客户端软件,软件采用客户机/服务器模式,实现了视频流的网络传输及远程控制等功能。终端通过摄像机和视频服务器完成视频采集压缩,利用WMN平台进行传输,客户端在Mesh网络的覆盖范围内通过因特网进行视频数据接收,实现无线视频监控。测试结果表明,系统播放流畅、实时性强,在无线视频监控中具有广泛的应用前景。     

网络视频监控系统在信息通信中的应用

本文深入探讨了网络视频监控系统的结构及其在信息通信中的具体应用,涵盖了从前端数据采集到后端数据处理与管理的全过程。系统由网络摄像机、视频编码器、网络传输、服务器存储与管理以及视频管理软件等关键组成部分构成,实现了远程、实时、高清、智能的监控功能。文章还详细分析了信息采集、处理与传输、存储与管理以及用户访问与控制等关键环节的技术原理,并强调了网络视频监控系统在提升公共安全和管理效率方面的重要作用。     

一种基于双C/S架构的视频监控系统

提出了一种集散武的视频监控系统,该系统采用双C/S架构,并由嵌入式视频采集终端、视频服务器和客户端3部分组成.目前,该系统已被用于网络实验室对实际实验设备的监控.     

网络智能视频监控系统

介绍了一种智能网络视频监控系统,实现了实时监控和目标实时跟踪功能。系统前端使用网络摄像机采集实时图像,通过网络服务器将实时图像传输给网络客户终端,在终端实现实时监控操作。实验表明,该系统具有良好的稳定性,提高了监控的效率和监控系统的准确度和联动性。     

网络智能视频监控系统

介绍了一种智能网络视频监控系统,实现了实时监控和目标实时跟踪功能.系统前端使用网络摄像机采集实时图像,通过网络服务器将实时图像传输给网络客户终端,在终端实现实时监控操作.实验表明,该系统具有良好的稳定性,提高了监控的效率和监控系统的准确度和联动性.     

基于Android和Raspberry Pi的远距离视频监控系统的设计

为了实现视频监控的移动性和远程操控,结合无线网络、Java语言和Eclipse开发编译工具,提出一种使用Android和Raspberry Pi组合,实现远程实时视频监控的新思路。摄像头获取图像数据,通过Raspberry Pi处理后以视频流的形式上传到图像服务器,以Android智能手机作为移动控制终端,通过Wi Fi访问图像服务器,获取图像数据并在控制界面进行显示,用户通过视频信息对移动机器人进行远程控制,达到远程实时监控的效果。通过实验测试,该系统可以有效地进行远程视频监控,具有良好的可用性。     

基于TMS320DM642的网络视频监控服务器的研究与实现

基于TMS320DM642DSP处理器构建的硬件平台,采用JPEG图像压缩标准,系统在软件设计上采用了TI的RF5框架和DSP／BIOS实时内核,采用了扩展的“类驱动／微驱动”二级设备驱动程序模型,实现了一个具有实时视频监控和以太网传输功能的网络视频监控服务器。     

基于FFMPEG的嵌入式视频监控系统

随着计算机技术的飞快发展,网络视频监控已经成为视频监控领域最重要发展方向,网络视频监控系统最早出现于2001年,网络化的嵌入式视频监控系统不受时间和空间的限制,本身可以做为视频流媒体服务器,突破了监控的时空限制,使客户端用户通过网络中的任何一台电脑来观看、录制和管理实时的视频信息。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.