基于DM642的视频监控系统硬件设计

介绍嵌入式视频监控系统的工作过程.本文采用TI公司新推出的专用多媒体处理芯片TMS320DM642作为主控芯片,实现了同时采集4路有声视频以及本地回放的功能,有效降低了成本,提高了系统利用率.系统主要由DM642模块、存储模块、视频模块、音频模块和电源模块等几部分组成,文中对这些模块一一进行了介绍.     

视频采集与回放技术在体育信息系统中的应用

概述了视频采集与回放系统,并对其中的视频编码、网络传输、视频存储等关键技术进行了研究,随后据此提出了一套基于DSP微型处理机与.Net软件开发技术的视频采集与回放系统设计方案,实现了对竞赛视频的实时采集、传输、存储与回放.系统已稳定运行于“第十六届亚洲运动会”等体育竞赛信息系统,实现了设计目标.     

基于TW9912嵌入式视频采集系统设计

根据无人机载视频图像实时采集系统的要求,设计了嵌入式视频采集处理系统。对于模拟摄像头隔行视频数据输出情况以及i.MX27数字接口CSI逐行数字视频数据CCIR BT.656视频输入接口要求,采用TW9912完成模拟视频数据数字化采集和隔行变逐行的数据采集处理,解决了模拟摄像头和嵌入式编解码芯片i.MX27视频采集接口问题。实验结果表明,利用本处理方法有效解决了过去采用图像处理算法的软件处理方法效果不理想的问题,保证了整个视频处理系统的高效实时图像处理的要求。     

基于Directshow的H.264解码器的设计与实现

为实现视频监控系统中视频的解码,提出了一个H.264视频解码器在Directshow中的实现方案.Directshow应用程序编程接口是一个基于Windows平台的优秀流媒体架构,它为在Windows 平台上处理各种格式的媒体文件回放、音视频采集等高性能要求的多媒体应用提供了完整的解决方案.     

基于H.264的嵌入式视频编码器的设计与应用

设计了一种适用于工业现场的嵌入式视频编码器，视频压缩按照H.264标准，在Intel 推出的PXA255 Xscale架构的处理机和源码开放的Linux嵌入式操作系统的基础上，实现了视频的实时动态采集、压缩和网络传输，介绍了系统的研制过程，给出了系统架构和关键技术。通过构建网络测试平台，将此编码器接入以太网，服务器端将接收到的压缩码流进行实时解压、回放。此编码器可用于远程视频监控系统中前端视频的实时采集、压缩和跨IP网传输。     

嵌入式视频采集系统的设计与实现

较为理想的嵌入式视频采集系统是基于DSP的视频采集系统,本文重点阐述了嵌入式视频采集系统的硬、软件设计环节以及开发中的一些关键技术问题。首先以TMS320DM642构建视频采集的硬件系统,详细介绍了TVP5150、SAA7121以及所设计的视频采集系统原理,该系统在Xc2s300控制下能实时将视频像进行采集、编码和传输;最后提出嵌入式系统的开发流程并分析嵌入式系统开发中的一些问题。     

基于嵌入式Linux视频图像采集系统的设计与实现

利用ARM技术设计和实现了一种基于嵌入式Linux的视频采集系统。该系统通过USB摄像头采集视频图像,调用Linux的Vide04接口模块进行视频截取和数字化处理,使用嵌入式QT完成图形界面的开发。系统测试结果表明：该系统能够流畅地进行视频播放,同时还可以完成视频图像的截取、存贮与传输,全部实现了设计要求。     

一种宽带语音系统的设计与实现

提出了一种新的基于G.722.1宽带语音编码的嵌入式语音处理系统的设计.实现了在背景噪声下进行语音采集、压缩、存储及回放.从系统角度阐述了宽带语音处理系统的设计、数据处理及测试方法,测试数据及实际应用表明,系统的语音压缩性能及解码后回放的语音质量满足了实际语音监控与话音识别的要求.     

基于B/S模式的嵌入式智能视频监控报警系统设计

本文设计了一种以嵌入式 WEB 服务器为核心,采用 B/S 结构的网络视频监控报警系统。该系统以 Intel Xscale PXA270芯片和嵌入式 Linux 系统为开发平台,通过 USB 摄像头采集图像,经处理传送到 WEB 服务器并通过 RJ-45 接口连接至互联网。通过等待浏览器的监控请求,为浏览器监控端提供实时视频图像,云台控制、视频录像、视频回放等操作控制。在被监控端,当传感器检测到报警信息时,系统会自动启动视频录制功能并记录视频信息。该系统具有操作维护简单、体积小巧、性能稳定、报警检测智能等优点。     

基于S3C2440的远程监控系统的设计

鉴于嵌入式监控系统具有可靠性好,成本低的优点,本文介绍了一种基于linux操作系统和arm处理器的远程视频监控系统。通过V4L2标准不间断的采集视频图像,经过基于MJPEG的算法对视频压缩后进行传输。本系统的压缩视频在传输时使用RTP／TCP协议来保证视频的实时性要求。通过USB摄像头,嵌入式硬件平台和主控计算机三部分构成了一个高质量、监控方式灵活、可靠性好的网络视频监控系统。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。