反走样字符图形叠加算法与FPGA快速实现

为了提高机载平视显示系统中反走样字符图形与背景视频叠加输出的显示效果,提出一种反走样字符图形与视频叠加算法并通过FPGA快速实现。叠加过程中增加反走样字符图形背景融合计算,使反走样字符图形与背景视频叠加后边缘光滑过渡,系统使用两片DDR3分别存储视频和图形数据,两者并行处理,提高系统整体性能,优化背景融合算法DDR3实现流程,降低DDR3中断复杂度。结果表明,该系统整体性能得到提高,叠加融合画面效果良好,灵活性强,适用于机载座舱显示系统。     

基于FPGA和USB3.0的高速CameraLink图像采集

采用Xilinx Artix-7FPGA和Cypress CYUSB3014为核心处理模块,配以DDR3作为帧存,设计了一套高速CameraLink图像采集传输系统。系统利用XilinxArtix-7自带的ISERDESE资源将串行LVDS的CameraLink视频流转换为TTL并行信号,DDR3存储器作为帧存对输入视频进行缓存,缓存之后的视频信号经过CYUSB3014芯片转换成符合UVC协议的输出数据,通过USB3.0的数据接口发送至PC机,在PC端上能够正常显示。     

基于FPGA的机载显示系统架构设计与优化

对基于FPGA的机载视频图形显示系统架构进行设计和优化。从实时性、BRAM资源占用和DDR3吞吐量三方面进行分析,改进帧速率提升算法来提高实时性;改进视频旋转算法来降低BRAM资源占用;改变不同模块的顺序来减少DDR3的吞吐量。比较结果表明,设计的系统架构满足性能需求,实时性能更好,BRAM资源占用降低,DDR3吞吐量降低,整体性能得到了提升。     

基于FPGA的DDR3存储控制的设计与验证

DDR3SDRAM是第三代双倍数据传输速率同步动态随机存储器,DDR3具有高速率、低电压、低功耗等特点[1-2];在DDR3控制器的实际使用中,如何将用户需要存储的数据在DDR3中快速存储非常重要,如果数据被送到DDR3接口的速度低,则会影响DDR3的存储速度,同时影响DDR3的实际应用,因此,针对DDR3存储器设计存储控制有重要的意义[2];基于此设计主要分为低速读写控制与高速流读写控制,低速读写控制主要用于小数据量的操作,高速流读写控制主要用于批量数据的存储操作;此设计在FPGA上通过了大量数据读写的验证,证明数据存储的正确性;经过测试,在高速流读写模式下,DDR3存储控制设计的带宽利用率最大为66.4%;此设计在功能和性能上均符合系统总体设计的要求。     

基于共享帧存结构的双通道视频控制器设计

介绍了一种基于共享帧存结构的双通道视频控制器设计。系统以单处理器、单视频控制器同时驱动两路画面不同的彩色显示器，完成复杂画面的实时生成。视频控制器采用分时控制原理，对存储于同一物理帧存储器的双路图形信息，可准确地生成地址刷新时序和视频控制时序，并行输出两路同步的视频流。该设计用于“一驱二”图形发生器，已成功应用于某型直升机玻璃座舱显示系统。     

基于Avalon-ST接口帧读取IP核的设计和应用

研究基于Avalon-ST接口帧读取的IP核设计应用,通过Avalon-ST接口将外部存储中不同格式的帧数据转化为视频流输出。根据Avalon总线协议及Avalon-ST视频协议研究设计方案,使用VerilogHDL语言对模块进行硬件设计,并将实现的模块进行测试。结果表明,该IP核与Altera公司提供的FrameReader模块相比,突破了现有的FrameReader只支持紧缩格式的局限,使其功能更加完善,并且该IP核占用的资源少,工作频率更高,性能得到了优化,实用性更强。     

基于DDR3-SDRAM的高速视频传输系统

设计了一种基于多片DDR3-SDRAM多BANK存储技术的传输系统,用于高速视频图像的传输。采用Camera Link总线技术用来接收视频图像数据,采用DDR3-SDRAM用来转存数据,对系统软件进行了搭建,对数据进行编码,并对DDR3-SDRAM多BANK存储进行仿真及分析。结果表明,DDR3-SDRAM多BANK存储技术可以有效地提高DDR3-SDRAM的工作效率,满足高速视频存储的需求。     

基于FPGA的多运动目标检测及硬件实现

针对视频流图像的目标检测,基于帧间差分理论提出了一种实时多运动目标检测算法。根据视频图像在实时处理中的应用,基于FPGA硬件平台并行处理快与可编程的特性,在FPGA上实现算法,经过MATLAB环境算法验证,并在设计的FPGA视频图像处理系统进行实现。该系统主要由图像采集模块、图像缓存模块、图像处理模块及图像显示模块4部分组成,通过OV5640采集图像数据,再对数据进行差分、滤波、形态学等一系列算法处理,存入DDR3中,最后通过VGA进行显示。实验结果表明,该系统在一定测距范围内可稳定跟踪运动目标,可实时显示,多目标检测识别率较高,能实时检测视频流图像中的多运动目标。     

高清视频编码存储接口的设计与实现

视频编码存储器接口是H.264高清视频编码系统的关键模块,用于快速高效地存储和读取编码过程中产生的大量中间数据（其中主要包括运动估计、宏块信息、去块滤波和码流数据等）。目前普遍采用的片外SRAM或SDRAM进行数据缓存的方案工作频率低,大数据量和编码实时性需求难以满足,这使得高清存储接口的性能成为系统设计的瓶颈。文中提出了基于DDR2控制器的存储接口方案设计和电路实现,还系统地描述了存储器接口的时序。通过后仿真验证和流片测试,证明文中提出的设计方案,划分存储器接口的子模块结构合理;实现的电路能有效地完成高清视频实时编码。     

基于PXI总线高速图像采集显示系统设计

为解决高速Camera Link数据视频图像信号的采集与显示问题,提出了以PXI系统为平台,利用FPGA强大的并行处理能力及内部丰富的块RAM资源,模块化设计PXI接口模块,Camera Link数据接收模块,SDRAM缓存模块及VGA显示控制模块,同时利用FPGA构造出相应的VGA时序信号,控制视频转换芯片ADV7123实现两路图像数据的图形显示的系统设计;试验结果表明,该系统可实现输入100 MB/s图像数据的实时显示,达到了预期的效果,具有一定的实用性和推广价值。     

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。     

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。