Contourlet相关性和PCA的图像融合算法

Contourlet变换克服了小波变换在处理高维信号时的不足,它比小波变换具有更好的方向性和更好的稀疏表达性能。将Contourlet变换应用于图像融合领域,能更好地提取图像边缘特征,为融合提取更多的特征信息。基于Contourlet变换系数相关性的图像融合算法是将图像进行Contourlet变换分解后,针对高频分解系数尺度内以及尺度间像素点具有的相关性设计图像融合规则,低频信息选择PCA的方法进行融合,最后通过重构得到融合图像。实验结果表明Contourlet能够为融合图像保留更全面的原始图像信息,基于相关性的图像融合算法能够更加有效、准确地提取图像中的特征,是一种有效可行的图像融合算法。     

基于非下采样Contourlet的多传感器图像自适应融合

提出了一种基于非下采样Contourlet变换的多传感器图像自适应融合方法,采用黄金分割法搜索最优的低频融合权值.自适应地对多传感器图像的低频子带系数进行融合.非下采样Contourlet变换是一种新的图像多尺度、多方向的表示方法,适合表达具有丰富细节信息及方向信息的图像,且该变换具有平移不变性,可以避免一般方法对融合图像引入的振铃效应,它的高频方向子带捕获了多传感器图像的显著特征,文中采用同一尺度下方向子带信息和取大的规则对高频系数进行融合.实验结果表明,与基于拉普拉斯塔、小波、平稳小波和Contourlet变换的方法比较,文中所提出的方法可以获得较好的融合效果.     

WBCT域系数相关性的图像融合算法研究

基于小波变换的Contourlet变换(WBCT)是一种非冗余的多尺度几何分析变换,比Contourlet变换具有更好的信息挖掘能力.因此将WBCT应用于图像融合领域,能更好地提取图像边缘特征,为融合提供更多的原始图像特征信息.WBCT域系数相关性的图像融合算法是针对WBCT分解系数尺度内以及不同区域内像素点间的相关性设计图像融合规则.实验表明,以WBCT为基础设计的系数相关性融合算法能更有效、更准确地提取图像中的特征,为融合图像保留更全面的原始图像信息,是一种有效可行的图像融合算法.     

基于Contourlet域隐马尔可夫树模型的图像融合

基于Contourlet域的隐马尔可夫树模型能反映不同尺度系数之间、不同方向系数之间的相关性,基于此,提出了一种基于Contourlet域隐马尔可夫树模型的图像融合算法。对源图像进行Contourlet变换,并针对高频子带系数建模并训练得到每一系数的后验概率;利用该后验概率指导高频系数融合的规则,对边缘和背景区域进行不同的融合处理,以尽可能保留原始图像的重要特征;进行Contourlet反变换得到最终融合结果。针对多聚焦图像进行了融合实验,采用联合熵、熵、相关系数、清晰度等指标对融合效果进行评价,实验表明了该算法优于基于Contourlet域的常规融合算法以及小波域隐马尔可夫树融合算法。     

基于Contourlet变换的多源森林遥感图像融合算法

提出了一种基于Contourlet变换的多源森林遥感图像融合算法.该融合算法首先利用Contourlet对输入图像进行多尺度、多方向稀疏分解,准确地捕获图像中的二维或高维奇异信息,然后在Contourlet域对不同频率信患采用不同的融合策略进行融合处理.仿真结果表明,该算法具有良好的融合效果,为火灾监控提供可靠的图像信息.     

V-变换和Contourlet变换相结合的图像融合算法

V-变换在表达图像时可以通过增加V-系统基函数的数量得到图像由粗到细的多尺度特征描述,但是V-系统不适宜描述图像的方向特性。为此,根据Contourlet变换的多方向性特征,将V-变换和Contourlet变换结合起来,提出一种图像融合算法,得到图像的多尺度和多方向特征描述,并将之应用到多聚焦图像的融合中。改进数学工具,设计加权局域统计特征的频域系数融合方案,并选用能刻画系数相关性特点的高斯分布作为权值。实验结果表明,与基于小波变换、Contourlet变换以及小波-Contourlet变换的多分辨分析的融合算法相比,该算法融合后的图像在边缘细节处更加清晰,视觉效果更好,信息量、清晰度以及与待融合图像的相关程度等客观评价指标也得到改进。     

NSCT变换的SAR和可见光图像融合

非下采样Contourlet变换同时具有多尺度、多方向选择性、多分辨分析和平移不变性质的特点,对SAR和彩色可见光图像融合的问题,提出一种基于非下采样Contourlet变换和HIS变换相结合的多传感器融合算法。通过对经非下采样Contourlet变换分解得到的不同频域子带系数选择方案的分析,对低频子带系数的选择,提出了一种基于SAR图像与彩色可见光图像物理特征的“加权平均”的系数选择方案;针对各带通方向子带系数的选择,采用绝对值选大多分辨率融合算法。实验以同一场景下ku波段的SAR图像和彩色可见光图像进行算法验证,实验结果和信息熵、均值、相关系数、偏差指数和交叉熵等客观评价数据表明,方法具有较好的融合效果。     

基于NSCT的红外与可见光图像融合

针对红外与可见光图像的不同特点,提出一种基于非采样Contourlet变换（NSCT）的红外与可见光图像融合算法。采用NSCT对源图像进行多尺度、多方向分解;分别采用基于局部能量和区域特征的融合规则得到融合图像的低频子带系数和带通方向子带系数;最后经过NSCT逆变换得到融合图像。实验结果表明,该算法能够获得较理想的融合图像,其融合效果优于基于Contourlet变换的图像融合算法。     

基于形态学和Contourlet系数区域特征的遥感图像融合方法

进行遥感图像融合时,全色图像空间信息的保留与多光谱图像光谱信息的保持是相互矛盾的,如何在这对矛盾体中实现最佳的融合效果一直是图像融合领域的研究热点。在IHS变换的基础上,将形态学和Contourlet变换相结合,针对多特征地物遥感图像的融合提出了一种基于图像特征的选择性融合算法。该算法先利用形态学操作将图像的边缘和非边缘信息进行区分,然后对处理后的图像进行Contourlet变换得到一个低频和一系列高频分量,再利用不同的区域特征自适应融合算法分别对低频和高频系数进行选择性融合,最后通过Contourlet逆变换和IHS逆变换得到融合结果。融合实验结果表明:对多特征地物遥感图像进行融合时,该算法是高效可行的。     

基于NSCT的红外与可见光图像融合

提出一种基于非下采样Contourlet变换的红外与可见光图像融合方法。该方法对源图像经非下采样Contourlet变换分解后的高频系数,考虑不同传感器的成像机理进行活性度量,并结合多分辨率系数间相关性来实现加权融合;低频系数则通过一种局部梯度进行活性度量,再采用加权与选择相结合的规则实现融合。最后,通过非下采样Contourlet逆变换重构获得融合图像。实验结果表明了该方法的有效性和可行性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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