基于SVM的图像低层特征与高层语义的关联*

在基于内容的图像检索中,针对图像的低层可视特征与高层语义特征之间的鸿沟,提出了一种基于支持向量机(SVM)的语义关联方法。通过对图像低层特征的分析,提取了颜色和形状特征向量(221维),将它们作为支持向量机的输入向量,对图像类进行学习,建立图像低层特征与高层语义的关联,并应用于鸟类、花卉、海洋以及建筑物等几个典型的语义类别检索。实验结果表明,该方法可适应于不同用户的图像检索,并提高了检索性能。     

基于SVM的图像低层特征与高层语义的关联

在基于内容的图像检索中，针对图像的低层可视特征与高层语义特征之间的鸿沟，提出了一种基于支持向量机（SVM）的语义关联方法。通过对图像低层特征的分析，提取了颜色和形状特征向量（221维），将它们作为支持向量机的输入向量，对图像类进行学习，建立图像低层特征与高层语义的关联，并应用于鸟类、花卉、海洋以及建筑物等几个典型的语义类别检索。实验结果表明，该方法可适应于不同用户的图像检索，并提高了检索性能。     

基于模糊支持向量机的面向语义图像检索算法*

为了缩减图像低层特征和高层语义之间的“语义鸿沟”,本文提出一种基于模糊支持向量机的面向语义图像检索(SBIR-FSVM)算法。在提取图像的低层特征的基础上,本文将最小隶属度模糊支持向量机引入到图像检索技术中,获取图像语义信息及消除传统支持向量机(SVM)在多类分类中产生的不可分区域,从而实现面向语义的图像检索。实验结果表明,本文提出的SBIR-FSVM算法与基于SVM的图像检索算法及综合多特征的基于内容的图像检索算法相比均有了显著的改进。     

一种基于SVMS的语义图像分类方法*

如何跨越图像低层视觉特征到高层语义特征的"语义鸿沟"已成为语义图像检索问题的分类图像分成五个区域;然后在提取图像底层特征的基础上,采用基于支持向量机组(SVMS)的方法建立图像低层视觉特征到高层语义特征之间的映射,将一幅图像同时归入一类或几类图像语义.实验结果表明,该方法具有较好的检索查全率和准确率.     

一种新的基于本体论描述的内容图像检索模型

分析了基于内容的图像检索中存在的问题,利用本体论方法建立图像底层特征本体及特定类图像本体.同时,定义了图像描述因子并建立相应的图像组合规则.最后,利用图像的底层特征进行图像检索,结合多分类支持向量机,实现图像底层特征与高层描述信息的关联,进而实现了图像语义检索,缩小了"语义鸿沟"对基于内容的图像检索的影响.实验结果表明本模型能够提高基于内容的图像检索的准确率,同时,经过3～5次反馈,可以实现语义检索功能.     

一种图像底层视觉特征到高层语义的映射方法

基于语义内容的图像检索已经成为解决图像底层特征与人类高层语义之间“语义鸿沟”的关键。根据图像语义检索的思想,提出了一种采用支持向量机(Support Machine Vector)实现图像底层视觉特征到高层语义的映射方法,并在此基础上针对特例库实现了图像的语义标注和检索。实验结果表明,该映射方法能较好地表达人的语义,以提高图像的检索效率。     

基于直推式支持向量机的图像检索

为缩小图像的低层特征与高层语义之间的语义鸿沟,基于支持向量机的相关反馈机制受到越来越广泛的关注,但这种方法并没有利用未标记样本的隐含信息.为更好地利用这些信息,提出将直推式支持向量机作为反馈过程中的学习算法.通过分析其所用特征向量的特点,设计一种颜色稀疏特征,并将其与纹理特征结合作为图像描述的特征.实验结果表明该方法较令人满意,同时也说明直推式支持向量机可在文本分类以外的领域取得较好结果.     

图像语义分类的树结构SVM方法

为了减小低层视觉特征和高层语义之间存在的"语义鸿沟",提出一种采用树结构支持向量机实现图像底层视觉特征到高层语义的映射方法。利用二叉树结构构建支持向量机(SVM),在SVM核函数空间利用距离作为树节点处的分类度量。二叉树的结构可以大大减小语义分类的时间,而将距离较大的语义类先分离开保证了语义分类具有较高的准确率。实验证明,该方法在保证准确率的同时可以在较大程度上缩短分类检索时间。     

基于层次语义的图像分类方法

为了更好地实现基于语义的图像检索,结合了颜色、纹理和形状的综合特征来表示图像,将它们作为支持向量机(SVM)的输入向量,对图像类进行学习,建立图像底层特征和高层语义的关联。采用综合特征表示图像,提高了分类正确率。同时按照分语义层次的方式组织图像库,实现图像的语义分层表示,用各层次的关键词来联合表示图像的语义信息。结果表明,可以在具有较好分类正确率的情况下,使图像具有更全面的语义表示。     

基于支持向量机的语义图像分类研究

随着多媒体数据库的不断发展,传统的利用关键词进行图像检索已经越来越不能满足图像检索的需要,基于内容的图像检索已成为当前的研究热点。对图像的颜色和纹理特征进行提取,融合图像的颜色和纹理特征作为图像的特征向量,用支持向量机实现图像的低层特征和高级语义间的关联。实验结果表明,多特征的图像检索要比单一的特征检索效果好,在HSV颜色特征的基础上引入灰度共生矩阵纹理特征后可有效提高检索效率,而且采用支持向量机融合多特征可成功用于图像的语义的检索。     

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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