嵌入式网络视频监控系统的设计与实现

本文介绍了基于嵌入式Linux和ARM9$3C2410平台的网络视频监控系统的设计与实现。该系统使用USB摄像头获取实时视频，采用H．264标准对原始视频进行压缩编码，通过JRTPLIB实时流媒体编程技术实现视频数据的网络传输．用户在客户端使用浏览器即可查看远程视频图像。     

基于S3C2440网络视频传感器软硬件平台的设计与实现

提出了一种基于嵌入式linux和H.264的网络视频传感器节点软硬件平台的设计方案。该方案构建了以ARM9处理器S3C2440A为核心、运行Linux操作系统的嵌入式软硬件平台,通过USB驱动和video4linux实现使用USB摄像头采集视频图像数据。同时针对视频图像数据量过大的问题,采用了H.264编码器实现对视频图像数据的压缩,为数据的远程传输带来便利。     

基于达芬奇平台的网络视频监控系统设计

以TI公司的DM6446为核心,在达芬奇平台上实现了视频采集、H.264编码、Web Server网络传输。在视频处理子系统上,使用嵌入式Linux的V4L2应用编程接口实现视频采集,为DSP内核后续的图像处理奠定了基础。摄像头采集的模拟视频信号经TVP5146解码后转换成数字信号被送到DM6446中进行H264压缩编码,并以RTP/RTCP协议传输给客户监控端;电脑客户监控端程序用摄像头可实现现场实时监控和远程控制。     

基于网络和H.264的视频监控系统设计

设计了一种使用网络和H.264视频编解码的监控系统实施方案。方案采用TI公司的DM6437 DSP作为硬件编码模块,对摄像头采集的视频进行H.264编码,编码后的视频数据借助RTP实时传输协议和UDP套接字在网络传输,并最终在PC机上实现实时视频的接收和显示。测试结果表明,该方案实现方便、效果良好,具有潜在的应用价值。     

基于B/S架构实时高清音视频监控系统

高清视频监控画面范围广同时产生巨大数据使得在网络传输中造成时延,也存在音频数据有限的问题。针对上述问题,文中设计一种基于B/S架构的实时高清音视频监控系统。USB摄像头基于V4L2接口采集图像,基于ALSA声卡驱动采集音频,结合H.265视频编解码技术和FAAC音频编码技术,以RTP协议打包封装H.265视频码流和AAC音频码流经网络同步传输到Web服务器,利用CGI,JavaScrict技术实现多种智能终端登录浏览器显示监控画面。经测试该监控系统画面清晰无抖动,音视频吻合效果明显满足实验要求。     

基于ARM11的嵌入式视频传输系统的实现

基于ARM11架构的微控制器S3C6410以及Linux操作系统成功实现数字视频传输.通过采用V4L2提供的接口函数,实现视频的采集;使用S3C6410自带的硬件编码模块实现视频编码;然后对H.264视频流进行RTP格式的打包;采用JRTPLIB提供的库函数,对编码后的视频数据进行实时发送;最后使用VLC播放器解读SDP文件实现了实时播放,以验证传输系统的实际效果.     

基于TMS320DM355的网络高清视频监控系统的设计与实现

介绍了一种基于嵌入式Linux和TMS320DM355处理器平台的视频网络监控系统的设计与实现.该系统可根据需要,选择采集来自于VGA接口或者摄像头的视频数据,利用嵌入式Linux操作系统的V4L2(视频设备的内核驱动),编写驱动程序,进而实现视频的采集.经MPEG-4压缩算法对采集到的视频流进行压缩编码后,通过实时传输协议(RTP)和实时传输控制协议(RTCP)实现编码的视频数据流在网络的传输.     

基于FFmpeg的远程视频监控系统编解码

在远程视频监控系统中视频数据的编码传输以及解码显示是一个重要组成部分,通过对FFmpeg的研究学习,考虑采用FFmpeg来实现编解码的方法.远程监控系统由采集发送端和接收处理端组成,采集发送端使用S3C2440作为嵌入式硬件平台,并通过USB摄像头OV9650采集视频数据,经过FFmpeg编码后传输给接收处理端.接收处理端接收到数据后通过FFmpeg实时解码,采用OpenCV显示,实现远程监控.     

嵌入式远程视频采集系统的设计与实现

介绍一种基于嵌入式Linux和S3C2410平台设计并实现的远程视频采集系统,他通过USB摄像头获取实时视频,使用Video4Linux提供的API函数进行视频采集程序的设计,经MPEG 4算法压缩编码,通过JRTPLIB实时流媒体编程技术实现了网络传输。整个系统建立在嵌入式结构上,能够独立完成实时视频的采集、处理及传输功能,可广泛应用于远程监控系统、可视电话、工业控制等领域。     

基于ARM11的视频无线异步串行传输系统的设计

基于Linux操作系统,以ARM11嵌入式处理平台为核心,采用异步串行传输和FSK调制解调方式,设计了一种视频采集、处理与无线高速传输系统。采用USB摄像头实现数字视频的采集,S3C6410处理器对视频进行H.264硬件编解码,并利用FSK调制解调模块和射频模块完成视频的无线传输与接收。经实验测试,系统达到设计要求。     

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.     

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.     

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.     

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.     

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.