基于ARM和Linux的嵌入式视频监控系统研究

随着嵌入式技术和网络技术的不断发展,在视频监控中使用嵌入式系统已经成为可能,而这要建立在以ARM处理器为基础的Linux操作系统之上。对此,本文以基于ARM和Linux的嵌入式视频监控系统为研究对象,在对嵌入式系统及Linux操作系统分别介绍的基础上,对嵌入式视频监控系统的现状进行了分析,希望本文能够为相关部门提供参考。     

基于Linux的无线视频监控系统的研究

随着嵌入式技术、图像压缩技术以及无线传输技术的发展,基于嵌入式系统的无线视频监控系统已成为视频监控领域的发展趋势。文章将嵌入式系统的特点与无线传输技术相结合,研究和开发出一种基于Linux的无线视频监控系统。本嵌入式视频监控系统采用C/S架构,服务器基于ARM11处理器,搭载嵌入式Linux系统,主要实现图像的采集、压缩、预览和传输;PC机作为客户端主要实现视频图像的解压、显示以及参数设置等功能。     

基于ARM嵌入式局域网视频监控系统的设计与实现

设计了一种基于S3C2410X的ARM9 linux系统组成的远程嵌入式视频监控系统,该系统通过局域网实现对现场情景的监控,首先介绍了ARM处理器的基本结构、性能等情况;然后重点论述了远程监控系统的信息传输方案,就监控软硬件的开发做了简要描述.结果表明,该系统达到设计要求,为应用ARM技术实现远程监控及视频网络传输提供了解决方案.     

浅析基于ARM的嵌入式视频监控系统

文章首先介绍了视频监控系统的发展及演变,而后对基于ARM的嵌入式视频监控系统的设计进行了深入探讨,以期对未来视频监控系统的发展与完善提供一定的启示。     

基于TMS320DM6467的多路视频监控系统视频接口的硬件设计

针对视频监控系统要求实时性高、运算量大等特点,提出了基于达芬奇技术的嵌入式视频监控系统设计方案。方案采用基于达芬奇技术的TMS320DM6467 ARM+DSP双核处理器,进行多路视频采集与监控。并根据TMS320DM6467内部的VPIF视频接口,采用合适的视频解码器和编码器设计出了标清视频信号的输入与输出系统。     

基于Web技术的嵌入式网络视频监控系统研究

针对传统的视频监控系统在实际应用中所存在的不足与问题,本论文详细研究设计了基于Web技术的嵌入式网络视频监控系统。首先简要分析了嵌入式技术,并对基于嵌入式技术的网络视频监控系统的功能需求和软硬件平台进行了分析,在此基础上重点论述了基于Web技术的嵌入式网络视频监控系统的实现方案,给出了系统的架构和软件程序的设计方案,对于进一步提高嵌入式技术在网络视频监控系统中的应用水平具有较好的指导和借鉴意义。     

3G无线视频监控系统的设计与实现

随着3G技术的日益成熟和嵌入式技术的飞速发展,数字化视频监控系统将逐步替代传统的模拟视频监控系统,同时随着人们生活质量的提高和活动范围的不断扩大对无线视频监控系统的需求越来越迫切,所以利用3G网络进行实时视频传输必将成为一种趋势。该系统在Linux操作系统下,搭建了一个基于ARM9的视频图像采集环境,并通过CDMA2000网络完成了视频图像的传输接收,实现了远程视频监控的功能。     

基于ARM架构的视频服务器设计

设计了一种基于ARM平台、Linux操作系统的视频监控设备。该套系统的服务器端使用了嵌入式的硬件编码传输平台,对基于ARM的网络视频监控系统进行了研究与设计。首先在对系统进行需求分析的基础上对系统硬件进行了总体设计,采用ARM9内核的GM8180芯片搭建硬件平台。通过硬件编解码芯片,在嵌入式平台上将实时采集进来的视频信号进行高质量的H.264压缩编码,并通过RTP封包进行网络传输。系统能够很好地实现监控中视频流的实时传输,能够保证视频流传输的实时、完整和高效,从而达到设计目的。     

基于ARM的水域移动视频监控平台控制系统的设计

该文介绍了一种基于ARM的水域移动视频监控平台控制系统的设计和实现方法。经测试,该监控系统工作稳定并已成功应用于相关视频监控领域。为了实现水域移动视频监控平台的移动性、方便性、可操作性,设计了基于水域移动视频监控平台的控制系统。首先分析了该视频监控平台控制系统的优点,并简单介绍了系统的总体设计及模块功能,然后重点介绍了基于ARM芯片为内核,采用嵌入式系统设计和实现方法,最后分析了测试效果。实现视频监控、平台控制等功能。该设计针对性强,功能实用,稳定性可靠。     

基于ARM9的网络视频监控系统设计与实现

针对传统监控系统无法联网、维护困难、成本高等不足,运用嵌入式技术和图像处理技术,设计了一种基于ARM9的网络视频监控系统。系统在Linux平台下利用Video4Linux进行视频图像采集,并进行JPEG压缩编码,通过构建嵌入式Web服务器,结合Java Applet技术,实现了远程网络用户通过IE浏览器对现场的视频监控。试验测试结果表明:在图像分辨率为640×480时,传输速率达到了20帧每秒。系统运行稳定、画面流畅、成本较低,具有广泛的应用价值。     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.