基于分块主色调和纹理特征的彩色图像检索

提出一种基于分块主色调和纹理特征的彩色图像检索方法。该方法首先提取占彩色图像比重较大的前几种主色调,根据主色调将图像划分为不同分块,并以主色调作为各分块图像的颜色特征。然后,采用灰度共生矩阵算法,提取各分块的纹理特征。综合考虑各分块图像的颜色特征和纹理特征,从图像数据库中检索相似图像。实验结果表明,该方法具有较高的检索效率。     

基于空间分布差异度的分块彩色图像检索方法

传统的基于颜色直方图的彩色图像检索方法具有计算简单和尺度变化不敏感的优点,但传统的方法普遍存在丢失图像空间信息和特征维数较高的缺点。为克服上述缺陷,提出了一种基于空间分布差异度的分块颜色直方图图像检索新方法。该算法首先将图像进行划分,并计算图像各子块间的相似度;然后,对分块的图像进行空间分布差异度的计算,并由此确定各分块的权值系数;最后,对各子块的相似度进行加权累加从而得到整幅图像的相似度。实验表明,该算法能克服传统方法的弊端,并具有较好的平均查找性能。     

基于人眼感知度的分块加权图像检索*

提出了一种基于人眼感知度的图像检索算法。该算法首先由像素的人眼感知度的计算得到各分块的权值,然后对分块的LBP纹理直方图和HSV颜色直方图进行加权处理,综合纹理和颜色特征进行图像检索。实验结果表明,该算法结合了局部图像的相关性,利用了纹理和颜色特征的互补能力,检索结果符合用户所需并具有较好的查准率和查全率。     

基于分块主颜色匹配的图像检索

针对颜色直方图无法表达颜色空间分布信息的问题,提出一种基于分块主颜色匹配的图像检索算法,对图像进行新的重叠分块,提取各分块的主颜色,将简化的二次式距离计算方法应用到分块主颜色的匹配中,并对图像各个分块的颜色特征采用不同的加权系数。实验结果表明,该算法在保持较高检索精度的同时,能够降低特征空间维度,提高检索性能。     

基于颜色特征的图像检索方法研究

基于颜色的图像检索因对图像的各种变化有很好的鲁棒性而得到了广泛的应用,但是由于缺乏空间信息而 造成检索误差。针对全局颜色直方图和分块颜色直方图的检索问题,提出了一种利用等面积的矩形环来提取颜色特 征的图像检索方法。该方法首先利用等面积的矩形环划分策略对图像进行分块;其次,提取子块的颜色累加直方图作 为颜色特征;然后,为了突出图像的主体区域,按照矩形环由里到外依次减小规则确定权值,并对两幅图像子块颜色特 征之间的距离进行加权累加得到两幅图像的相似度量,以此进行检索,并输出相应的查询结果;最后通过实验结果表 明:该方法与全局直方图、累加直方图及传统分块直方图相比,具有更高的检索效果。     

基于内容的多特征融合图像检索

提出一种组合颜色、形状和空间信息的图像检索方法,用颜色块的颜色直方图表示图像的颜色特征;使用Zernike矩表示图像的形状特征,通过提取颜色块的质心、分布方差聚散度等特征得到图像的空间特征。为了进一步提高图像检索的精确度,提出一种基于支持向量机的相关反馈方法。实验结果表明,基于组合特征的图像检索方法优于基于单一特征的检索方法。     

一种新的基于分块颜色和形状的图像检索方法

基于图像单一特征的检索方法只能反映图像的部分属性，应用范围受到限制。本文在分析图像颜色和形状特征的基础上，根据各自的特点，提出了一种新的基于分块颜色和形状的图像检索方法。首先，在图像分块的基础上提取颜色和特征点；其次，根据特征点提取图像的形状信息；最后，以颜色和形状作为综合特征，采用相应的匹配算法进行图像检索。实验证明该方法不仅准确度高，而且还可应用于基于对象或区域的图像查询中。     

基于颜色和形状特征的图像检索方法

提出了一种基于颜色和形状特征的图像检索方法。在对HSV颜色模型量化的基础上,提取颜色直方图作为图像的颜色特征。在提取形状特征时,结合颜色量化结果,利用图像分割提取图像的形状特征,利用两特征的加权距离计算图像之间的相似度,而后进行图像检索。实验结果表明,该方法取得了较好的检索效果。     

基于颜色和形状特征的图像检索系统

随着信息技术的迅速发展,为了高效地从大量图像实例中找出有用信息,改善基于单一特征的图像检索方法的效率和准确性,提出基于颜色和形状信息的多特征图像检索方法,利用 VC++6.0工具开发图像检索系统.算法采用 RGB 颜色空间分块直方图和边缘形状 Sobel 算子相结合的算法提取图像特征.利用600幅756×504大小的 JPEG 四种分类场景图片构建图像库,通过实验,首先基于单一的颜色形状特征进行检索得到结果;再通过综合颜色和形状特征的检索算法实现基于多特征的检索,两次实验相对比结果表明多特征检索系统在实际应用中具有高效性和优越性     

基于全局不变矩和分块主颜色的图像检索算法

为充分发挥全局不变矩对图像形状信息着重考虑的优势,规避颜色直方图未曾考虑图像的空间位置以及常见分块策略忽略分块间的相互联系等弊端,提出一种改进的全局不变矩和分块主颜色相结合的图像检索算法。计算图像的全局不变矩,提取图像各分块主颜色,将两者进行归一化处理后进行线性加权求和,计算综合相似度。实验结果表明,该算法具有较高的检索精度,能够提高检索性能。     

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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