基于DSP的H.263图像实时编码研究与实现

主要介绍基于TMS320DM642EVM开发的用于局域网视频监控系统中的视频编码器。该系统对CIF格式的图像充分利用了实时压缩编码技术,即ITU-T H．263视频压缩标准,结合DSP的编程特点,对C代码进行优化。并针对DsP结构的特点,对程序代码和应用数据进行合理的存储分配,使系统的编码速率可以达到25帧／s,满足实时性要求。     

基于DSP技术的H.263视频编码协议算法

对H．263编码原理进行了简单介绍，对运动估值中几种主要搜索算法的性能进行了分析比较，完成了H．263的运动图象的编码模拟，最后对其中的搜索算法——十字交叉搜索算法在TMS320 C6211 DSK板上进行了仿真。     

基于通用DSP的数字电视信源解码器硬件实现

针对目前国际上数字电视信源解码器主流解决方案即专用芯片方案缺乏广泛适应性和功能改变的灵活性等。提出了基于通用数字信号处理器TMS320C6415的标准清晰度数字电视信源解码器的总体设计方案和硬件实现方法．该方案可用软件实时实现传送流解复用、音频和视频解码，系统运行稳定可靠，音、视频输出质量良好．     

H ．264视频流实时传输嵌入式系统设计与实现

本文研究H．264编码视频流传输系统在嵌入式系统中的实现,提出了在Linux操作系统中集成不同编程模型的软件设计方法,对H．264视频RTP负载规范和流传输方法进行了研究,基于TMS320DM6446x实现了一个实时视频流传输模块,最后给出了模块的一个应用案例。     

远程教育视频系统的设计与应用

分析了H．320和H．323等协议，根据我国现代远程教育发展的需要设计一个基于IP的远程视频系统，将实时教学和非实时教学融为一体，增强了视频教室的功能，满足了各种教学的需要，并在此基础上给出了一个具体的实现方案。     

基于DSP＋FPGA结构的图像跟踪系统的设计

介绍了一种基于DSP＋FPGA结构的小波图像处理系统设计方案,以高性能数字信号处理器TMS320C6711BFPGA作为核心,结合现场可编程门阵列,实现了实时数字图像处理．     

基于TMS320C80的离散Hadamard变换并行实现

针对离散Hadamard变换在实时信号处理中具有广泛应用,但其运算速度受到DSP器件性能限制这一实际情况,进行了离散Hadamard变换的并行性研究及并行性能分析;并在基于并行多处理机平台——TMS320C80的编程结构基础上,实现了并行离散Hadamard的变换.基于TMS320C80进行的试验表明:所开发的并行DHT算法运行结果与理论分析吻合,该并行算法的速度和精度都得到了保证.     

H.264视频流实时传输嵌入式系统设计与实现

本文研究H.264编码视频流传输系统在嵌入式系统中的实现,提出了在Linux操作系统中集成不同编程模型的软件设计方法,对H.264视频RTP负载规范和流传输方法进行了研究,基于TMS320DM6446x实现了一个实时视频流传输模块,最后给出了模块的一个应用案例。     

基于DSP的视频编解码器的控制

以TMS320C6416为核心,实现视频图像的实时采集与处理。利用DSP的GPIO口模拟I2C总线实现对视频编解码器的寄存器控制。系统具有结构简单、配置灵活、实时性高、通用性强的优点。     

煤矿视频监控系统设计

设计了一套针对煤矿系统应用的视频监控系统,整个视频监控系统由视频前端采集、视频压缩编码处理、网络传输控制等模块组成。视频采集部分采用面向数字多媒体应用的DSP—TMS320DM642完成高分辨率视频数据采集,完全满足实时性要求。为了对数据进行实时的采集和处理,在DM642平台移植适合嵌入式应用的实时操作系统——μC／OS—II。视频压缩处理采用自主知识产权的AudioVideocodingStandard（AVS）编码标准,完成AVS编码在达·芬奇平台TMS320DM642移植。网络传输控制使用SIP做访问控制协议。RTP／RTSP做传输协议。本系统通过对煤矿系统的实时监测,可迅速有效地应对各种突发事件,减少人员伤亡和财产损失。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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