基于DM8168和CPCI接口的音视频处理板卡设计

为了实现对音视频信号的采集、编码、解码、存储与传输,同时也为了满足整机系统的模块化设计要求,设计并实现了一种CPCI接口的3U音视频处理板卡。硬件方面,它以TI公司的达芬奇系列芯片DM8168为核心处理器,通过一个3U规格的CPCI板卡,将SDI高清视频、CVBS标清视频、音频信号的采集处理和千兆以太网、USB接口、SATA接口等功能集成到一起。软件方面,则通过运行于DM8168之上的嵌入式Linux操作系统,实现音视频的采集、H.264、G.711压缩解压缩算法、TCP/IP传输协议等功能。经过使用测试,本音视频处理板卡满足了两路视频数据采集、H.264编码、存储和千兆网传输等要求,也达到了整机系统的模块化设计要求。     

多接口视频编码方案的设计与实现

针对现有编码系统处理视频格式单一的问题,提出多接口视频编码方案,采用TI DSP(TMS320DM8168)+FPGA构架,将多种常见的视频接口设计在同一系统中,应用FPGA采集视频数据后传送给DM8168,通过软件控制送至各子模块,进行编码。经长期测试结果表明,该系统编码性良好,视频显示无误码,适用性和通用性更强。     

基于TMS320DM8168嵌入式图像处理系统的软件设计

视频信息具有直观性、确切性、高效性、广泛性等优点,其开发、利用具有重要的应用价值。TMS320DM8168是一款处理能力强、运算速度快的DSP+ARM平台,支持多路视频数据采集和编码。该系统是一个基于TMS320DM8168平台实现两路高清视频捕获、H.264编码、存储和传输等功能的系统方案。系统功能强大,支持两路cameralink接口视频数据输入、高速固态硬盘数据存储和千兆网口数据传输,可广泛应用于视频监控领域。     

基于Linux系统的USB摄像头视频播放实现

随着USB摄像头的普及以及Linux系统桌面应用的推广,基于Linux系统的视频播放程序设计有着现实应用的意义。采用应用编程接口Video4Linux2所提供的数据结构、应用函数等,实现在Linux环境下USB摄像头图像数据的采集功能,并运用GTK库显示和播放其视频图像。运用Linux标准库函数实现了数字图像的采集,对基于Linux内核的后续图像应用开发具有实用意义。该程序采用Linux系统下新的视频编程接口和标准库函数,以模块化结构实现所需功能,具有良好移植性,基于此平台可方便加入图像处理等其他应用模块。     

V4L2在TMS320DM8168高清视频监控系统中的实现

随着科技社会的发展,安防监控领域视频设备的高清化已成为新的发展趋势。采用TI最新推出的达芬奇单片系统TMS320DM8168,设计了一套高清视频监控系统。主要介绍了V4L2在该系统中的实现,主要包括视频接口设计、V4L2采集设备驱动开发和V4L2采集应用程序设计等内容。测试结果表明该系统中实现的V4L2驱动和应用程序能够为DM8168高清视频监控系统提供高清视频数据,具有良好的可靠性和稳定性。     

V4L2在TMS320DM8168高清视频监控系统中的研究实现

随着科技社会的发展,安防监控领域视频设备的高清化已成为新的发展趋势。采用TI最新推出的达芬奇单片系统TMS320DM8168,设计了一套高清视频监控系统。本文主要介绍了V4L2在该系统中的研究实现,主要包括视频接口设计、V4L2采集设备驱动开发和V4L2采集应用程序设计等内容。测试结果表明本系统中实现的V4L2驱动和应用程序能够为DM8168高清视频监控系统提供高清视频数据,具有良好的可靠性和稳定性。     

基于McFW的图像处理算法验证框架设计

借助DM8168硬件平台,在McFW框架下,使用Link API接口,研究设计了具备灵活性和实用性的图像处理算法验证框架。该框架逻辑清晰,结构紧凑,充分利用DM8168处理器的多核和多通道特性,克服了原生McFW框架中DSP图像处理算法只应用于摄像头捕获数据的局限性,着重于满足图像处理算法验证,开发各项需求,方便算法开发人员移植、集成和测试图像处理算法。该框架既适用于算法验证,又可用于嵌入式产品开发,为图像处理算法由PC机向嵌入式移植提供了很好的过渡。最后基于该框架初步实现了均值偏移目标跟踪算法的移植,在多路摄像头输入的情况下,针对固定场景视频监控,满足实时性要求,硬件资源分配合理,证明了该算法验证框架的正确性和有效性。     

基于TMS320DM8168的嵌入式高清视频系统

以TI公司的TMS320DM8168处理器为核心,实现高清视频采集回放系统。设计一种文件管理策略,将视频文件的时间数据和图像数据分离,提高了文件播放的效率。解决了高清视频的实时压缩存储解码回放问题。     

基于ARM的视频监控系统的研究及应用

文中提出了一种基于ARM9处理器和嵌入式Linux的远程视频监控系统。该系统采用USB接口的摄像头获取原始视频图像数据,经过JPEG压缩编码处理,然后通过UDP协议完成网络传输,最后构建嵌入式Boa服务器,客户端通过Java Applet与Boa服务器交互,完成了视频图像的远程控制。该系统具有开发成本低、安全性高、稳定性强及分布式远程监控的优点。     

基于DM6467T的音视频同步压缩传输系统设计

针对当下人们对海量高清音视频需求的不断增加而高清音视频压缩传输技术发展相对缓慢这一问题,提出基于DM6467T的音视频同步压缩传输系统设计。该系统以TMS320DM6467T处理器为核心的DSP+ARM双核芯片作为硬件设备,Windows操作系统作为软件开发平台,HDMI摄像头为高清视频采集设备,3.5 mm的麦克风为音频采集设备,利用H.264/AVC中的DCT变换系数奇偶性音视频同步压缩算法进行同步压缩,通过DM6467T中的以太网接口进行同步网络传输至PC机上进行同步观看。测试结果表明该系统达到了预期设计目标。     

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.     

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.     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

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.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.