动态环境下多媒体视频兴趣区的自动捕获系统设计

动态环境下对多媒体视频兴趣区进行捕获时,图像背景是持续转变的,存在高低不平的布局问题,导致当前面向特定背景环境的目标捕获方法,无法获取清晰的图像,提出依据优化目标捕获算法,设计动态环境下多媒体视频兴趣区自动捕获系统。该系统通过多媒体视频图像采集模块采集多媒体视频图像的数据,利用数据格式转换模块变换获取多媒体视频图像数据,完成转换的视频图像数据可存储在数据缓存模块中,图像算法分析模块采用高斯混合模型提高图像背景的透明度,捕获清晰的视频兴趣区图像,并将捕获的图像目标传动核心芯片为ADV7123的视频图像显示模块进行显示。实验结果表明,所设计系统可准确捕获运动的视频兴趣区目标,并且目标清晰度较高。     

动态环境下视频兴趣区的自动捕获系统研究

传统的动态环境下视频兴趣区自动捕获和监控识别系统采用Zig Bee编码和特征提取方法,因动态视频在传输过程中产生衰减失真,导致视频图像采集传输丢包,自动捕获性能不好。提出一种基于Huffman编码和MUX101程控开关控制的动态环境下视频兴趣区的自动捕获系统。通过VXI系统总线高速传输视频数据到AD8021芯片,进行反馈电阻控制,实现视频特征的动态提取和捕获,选用程控放大器VCA810,通过局部总线向HP E1562E 8GB提供传感器信号,达到调整视频特征兴趣区域放大倍数的目的。设计Huffman编码及视频兴趣区特征提取算法作为软件核心部分嵌入,采用VXI总线技术实现对动态视频兴趣区的自动捕获系统的硬件设计和软件设计。仿真结果表明,采用该系统进行动态视频采集和兴趣区特征的自动捕获,准确度较高,丢包率较少,性能优越。     

一种基于动态密文的软件版权保护方法

为了保护软件的版权,设计了一种基于动态密文的软件保护方法。该方法使用用户计算机的指纹信息和软件的附加信息作为用户计算机的特征信息,对这些特征信息用MD5算法生成MD5码,然后用DES进行加密生成密文。在软件运行时,对存储的密文进行解密并读取其中的信息,然后读取当前计算机的指纹信息与密文中的信息进行比较,验证软件的版权,达到保护软件版权的目的。     

基于区块链的电力用户窃电视频图像存储系统设计

为避免电网主机记录的电力用户窃电视频图像的色度水平与真实图像色度水平出现较大偏差,影响视频图像信息的真实存储,设计基于区块链的电力用户窃电视频图像存储系统。根据I2C总线配置原则,设置嵌入式微处理器与视频信号转换模块的实时连接关系,实现电力用户窃电视频图像存储系统的硬件环境搭建。在此基础上,部署关键区块链节点,利用FPGA程序编译的处理方法,规划视频图像信息的存储模式,实现系统的软件执行环境搭建,结合相关硬件设备,完成存储系统设计。实验结果显示,与多核架构型存储系统相比,在区块链技术支持下,电网主机记录的电力用户窃电视频图像色度值更接近其真实色度水平,符合真实存储视频图像信息的实际应用需求。     

基于网络的主动防泄密文件加密技术

分析信息安全防护现状,提出基于网络的系统密钥加密机制,在加密与eKey模块应用设计基础上,研制一种密钥安全获取通信协议,实现了密钥的安全管理,设计了缜密的加解密流程,使得文件只能被特定网络环境下合法的用户所存取,从整体上达到了信息主动防泄密安全防护的目的。     

基于角色权限的认证管理系统的设计与实现

设计了融合ISO9000、ISO14000和OHSAS18000三种管理体系认证的认证管理系统,并采用基于角色授权的思想,对其权限控制方法进行改进与优化,通过读取用户在数据库中存储的授权信息,动态生成用户功能树的方法来实现权限管理,管理员可以通过模块授权、角色授权和功能点授权三种方法对用户授权,以供应用系统使用。     

基于单片机的环境检测与自动调节系统设计

针对目前家用种植环境检测调节系统功能单一、生产成本高、结构复杂的问题及自动调节、无线传输等需求,设计了基于单片机的检测与自动调节系统,使用电脑作为检测终端且能够进行数据存储.采用STC89C52RC单片机为核心,使用DHT11模块获取植物生长环境中的温度和湿度信息,利用BH1750模块获取环境中的光照强度,能够在液晶屏...     

基于VxWorks的嵌入式IP机顶盒的设计与实现

介绍了基于嵌入式实时操作系统VxWorks的IP数字机顶盒的设计及其组成，并阐述其具体实现，该机顶盒可以在MediaHawk视频点播协议下使用无线鼠标和无线键盘进行基于Web浏览方式下的视频点播。IP机顶盒客户端主要由网络链接捕获接口模块、与视频服务器连接控制命令交互模块、多媒体节目解码播放模块、用户操作接口模块等主要模块组成，以下将逐一说明各个模块的具体实现。     

基于分布式缓存的科技文献信息动态检索系统设计

为便于科研人员研究科技发展前沿动态,设计基于分布式缓存的科技文献信息动态检索系统,为用户匹配最佳检索结果。用户层将用户检索需求传输至处理层数据采集模块,该模块采集数据信息后经网络层通信模块将信息传输至数据层科技文献信息数据库中存储;数据层分布式存储模块采用分布式缓存方法将以往的检索记录信息分别存储至热数据库及冷数据库中;利用网络层传输科技文献信息数据库内的检索需求信息至处理层检索处理模块,通过科技文献信息动态检索方法处理接收到的检索信息,将处理后信息与数据层分布式存储模块内的关联数据进行排序重组,获取检索结果,并通过用户层展示检索结果。结果表明,该系统可有效且准确地为用户检索其所需的科技文献信息,检索MAP值为0.95以上,系统具备较快的读写速度与较强的数据传输能力。     

基于XML的Web信息筛选器的设计与实现

为了给用户提供有效信息,能够根据用户的需要对Internet上的网页信息进行获取和过滤,设计了一个基于XML的Web信息筛选器。系统利用了XML作为中间数据的数据交换技术将Microsoft.NET技术、数据库技术与XML技术相结合设计并实现Web服务程序。采用在Web服务和客户端应用程序之间使用基于XML的存储和访问技术进行数据交换与处理的实现方法,构建了一个基于XML的Web服务,进行解析并过滤多余的信息,将解析后有用的信息结果返回给请求数据的客户端,实现为用户提供特定信息的服务。     

Progress in electrophotography in Western Europe

A review is given of the progress in electrophotographic science and technology in Western Europe during the years 1967 to early 1971. University research work is mainly directed towards two areas: 1) the electrical and physical properties of photoconductors, such as selenium, chalcogenides, oxides, and organic materials; and 2) the sensitization of these photoconductors. Industrial research teams report on the preparation of electrophotographic layers on development and on image evaluation. A bibliography including scientific papers and patents published on this subject during said period completes this review.     

智能通信在楼宇自控系统中的应用

随着计算机技术、控制技术、通信技术及信息技术的飞速发展,人们对生活、办公环境安全性、舒适性的要求日渐增长,智能建筑应运而生。楼宇自动化控制系统是智能建筑的一个重要组成部分。通过结合具体的智能楼宇控制工程项目,在介绍系统概况的基础上,给出了系统的总体设计方案及子系统的监控方案,具有一定的实用价值。     

Advances in millimeter-wave subsystems in Japan

The authors describe the development trends and results of millimeter-wave systems in Japan in such fields as communication, radar, and measurement systems. The applications included are the W-40G waveguide transmission communication system, an automobile traffic control system using the 60-GHz band, a collision avoidance radar system for an automobile, a plasma electron density measuring system, and satellite communication. The authors describe the development of devices such as high-power FET amplifiers, traveling wave tube amplifiers (TWTAs), IMPATT amplifiers, low-noise amplifiers, and monolithic microwave integrated circuit (MMIC) devices used in constructing the millimeter-wave systems     

General Trend in Electrical Communications in Japan

Systems are currently being designed for higher reliability and greater economy. Larger transmission capacity is required to meet a rapid increase in recent communication demands instigated by the introduction of video and information communications facilities. More flexibility, to deal with the variety of communication modes to come, and smaller hardware dimensions, to overcome situations caused by the high population density, seem to be particularly sought in the communication technology of Japan. Research and development concentrate on these objectives. The following is an explanation of the present state of the art and general trends in this country.     

Progress in display-device development in Western Europe

A review of the basic research and industrial development of display devices in Western Europe during the years 1968 to early 1973 will be given. The display types considered are: 1) active displays such as cathode ray tubes, light-emitting diodes, electroluminescence cells, and gas discharge devices, and 2) passive displays such as laser displays, light valves, and ferroelectric and liquid-crystal devices.     

Designing in reliability in advanced CMOS technologies

Assessment of design implications due to degradation of CMOS devices is increasingly required in the latest technologies. This paper presents selected topics relevant to realize an efficient design-in reliability methodology in the latest generation CMOS technologies. NBTI is discussed in terms of characterization using On-The-Fly (OTF) methodology. Extension of OTF method is discussed using bias patterns to gain insights into NBTI under analog operation. A reliability simulation methodology is discussed against requirements for optimization and integration within an existing design flow. The features of this methodology are illustrated using some simple design examples.     

Switching conduction in ion-irradiated layers in GaAs

Experiments have been performed to investigate whether switching phenomena are observable in ion-irradiated GaAs. It is found that the V/I characteristics of H2+-and N+-irradiated layers show both negative resistance and switching from a high resistance to a low resistance state. Ion irradiation may thus be a useful method of fabricating switching devices.     

Electricity in China-generation in the People's Republic

Before the establishment of the People's Republic, China was a semi-colonial, semi-feudal society plagued by foreign interventions and internal power struggles. It was against this background that the electrical industry went through its infancy. Today, the People's Republic of China is facing an acute energy shortage, posing a problem which must be quickly overcome if the country's rapid industrialisation is to continue as planned. The author presents a brief history of power generation in China from 1949 to 1983 and examines possibilities for the future