基于DSP和FPGA的实时图像采集处理系统的设计

针对目前对图像采集处理系统的高速性和便携性的要求,设计了一套基于DSP、FPGA和ARM9的实时图像采集处理系统.该系统主要利用FPGA的SoPC系统定制NiosⅡ软核处理器及相关外设IP核来完成图像数据的采集和存储.DSP通过EMIF接口和EDMA接口完成数据的搬移和图像处理的算法.ARM作为主机,通过HPI接口与DSP进行数据通信.结果表明,该平台工作性能稳定,处理能力强,能完成算法的数据处理并对数据实时显示,适用于自动循迹、模式识别等高速数据采集的应用场合.     

基于FPGA高速图像数据的存储及显示设计

设计了一种基于FPGA控制Nand Flash阵列实现高速流水线式存储的方案。设计利用FPGA作为主控制器,通过Camera Link输入通信接口将图像数据经过一/二级缓存写入Flash存储阵列中,并采用DMA传输技术将存储后的图像数据上传至计算机硬盘中作进一步处理;同时,利用SDRAM显存实时刷新数据,FPGA构造相应的VGA信号,最终实现100 MB/s图像数据的实时显示。     

雷达视频回波信号的实时采集、显示与存储系统

介绍一种雷达视频回波信号的实时采集、显示与存储系统。该系统采用带有RAID适配卡的工控机作为采集主控设备，以普通微机显示器作为显示设备，利用多个IDE硬盘组成磁盘阵列作为存储设备。制作了一块基于FPGA的高速雷达信号采集PCI卡，以FPGA为采集的核心控制芯片，并在FPGA内部实现了32bit／33MHz的PCI接口逻辑。利用FPGA内部双口RAM的乒乓切换与缓冲区环行存储技术保证了连续采集。采用数据抽取、坐标查表映射和DirectDraw等技术在普通显示器上以P显方式进行实时全屏显示，同时可对局部区域以B显进行开窗放大显示。显示过程中可对任意区域设置采集方位和距离波门，将采集的数据实时存储在磁盘阵列上。该系统已成功用于舰栽警戒搜索雷达的外场数据采集。     

X射线相衬成像图像采集系统的远程控制传输设计

为了满足X射线相村成像技术对图像采集装置的大面积和高分辨率的特殊要求,提出了一种基于ARM9和FPGA的远程图像采集控制传输系统的设计方法.系统由LUPA4000CMOS图像传感器、ARM9、DM9000A、FPGA,DDR2 SDRAM等器件组成.采用FPGA和DDR2技术,可以对大数据量的图像数据进行实时缓存,解决了高分辨率、大数据量图像数据实时存储和获取的关键问题.采用以太网远程控制传输的方法,能有效避免X射线辐射.实验结果表明,该系统可以实时准确地获取大面积、高精度图像数据.     

一种多通道实时数据采集监控系统设计与实现

设计并实现了一种基于ARM的多通道实时效据采集监控系统;该系统由下位机系统及上位机软件组成,下位机硬件主要基于ARM工控开发平台、数据采集板及模拟量输出板,采用μC/OSⅡ实时多任务操作系统,实现多通道数据的采集、数据存储及模拟量的输出,并将采集数据实时传送至上位计算机;上位机软件接收数据进行监控,图形化显示数据变化曲线,并控制下位机的模拟量输出功能;通过实验验证,下位机系统能够实现多通道数据的采集、存储及模拟量的输出,μC/OSⅡ操作系统完成多任务的实时调度,上位机软件成功进行模拟量数据的采集监控及数据变化的图形显示,整个系统具有良好的实时性.     

基于FT245RL和FPGA的6路数据采集系统设计

针对大规模数据采集过程中存在数据量大与传输速度慢的矛盾,文章设计了基于FT245RL和FPGA的6路数据采集系统;该设计采用Xilinx公司的FPGA作为整个系统的核心,控制A/D转换器实现6路模拟数据的同步采集,并将转换后的数字信号存储到Flash中,最终通过USB2.0转换芯片将数据传输到上位机;试验表明,该数据采集系统能够满足对大容量数据实时采集、存储和上传的要求,具有工作稳定,可靠性高,传输速度快的特点,能够广泛应用于大规模数据的采集.     

基于ARM与FPGA图像采集存储系统设计

设计实现了一种基于ARM与FPGA高速图像采集存储系统.该系统采用视频编码芯片SAA7113和FPGA实现高速视频采集,采集数据经由ARM处理器读取并存储到大容量硬盘存储器,为数字图像的后续处理提供了可能.     

遥测数字视频信号高速采集存储系统的设计与应用

介绍了遥测数字视频信号的高速采集与实时存储,主要阐述了系统整体设计、存储器硬件设计、FPGA逻辑时序设计以及系统自检测试;其中硬件设计包括数据解码、Flash硬件设计以及LVDS调度模块,时序设计包括视频信号采集模块时序和Flash读写擦控制时序;本设计由FPGA来控制视频信号的高速采集和图像数据的高速串化与解串,通过LVDS接口传输方式进行Flash存储,再将存储模块中的数据读出,发送至地面综合测试台进行解包分析,完成自检功能。其中输入数据码流为31MB/s,供电电压28V左右,帧率为100帧/秒;本设计具有高码流、存储容量高的特点,大大提高了遥测系统的可靠度,已经在项目中得到应用。     

基于以太网的加速度传感器数据采集传输系统设计

设计了一种可实现对实时数据进行采集、传输、存储以及数据显示与处理功能的测试系统.硬件采用的是FPGA的控制单元,通过AD芯片转换和以太网模块将数据传输给计算机,利用MFC制作的上位机软件进行数据分析、采集和存储.上位机通过协议对下位机FPGA系统进行控制.测试结果表明:该系统对MEMS加速度传感器的数据能精确地显示、采集.     

FPGA的实时PCM遥测数据传输系统设计

为解决遥测系统的高速传输问题,设计了嵌入式架构的实时PCM遥测数据传输系统.该系统采用FPGA进行IRIG-B时码信息提取,并按照时码信息完成遥测数据的帧同步、串并转换,然后采用ARM处理器完成遥测数据的显示、本地存储和网络上传功能.实验表明,该系统传输PCM遥测数据稳定可靠,实时性强,满足小型航空器的实时数据监控需求.     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.