基于图论的图像分割研究进展

基于图论的图像分割技术是近年来国际上图像分割领域的一个新的研究热点。该方法将图像映射为带权无向图,把像素视作节点,利用最小剪切准则得到图像的最佳分割。论文对图论方法用于图像分割的基本理论进行了简要介绍,并对当前图论方法用于图像分割的最新研究进展进行了综述。     

基于图论Isoperimetric算法的岩心图像分割

基于图论的图像分割算法是当前图像分割领域研究的热点,其中归一化分割（Ncut）是一种典型的图论分割算法。但Ncut分割的速度慢,分割结果容易受图像的噪声和虚假边缘的影响,难以应用到实际。为此,提出一种基于图论的等周（Isoperimetric）改进分割算法。该算法使用解线性方程的方法代替解特征向量的方法、用4-邻接的方法代替全连接,避免了复杂的空间滤波。该算法运用到岩心图像分割中,提高了分割的效率,取得了较好的分割效果。     

图像分割方法综述研究

图像分割是计算机视觉领域重要和基础性的问题,也是颇具挑战性的任务。为了解该问题的研究现状、存在问题及发展前景,在广泛调研现有文献和最新成果的基础上,针对2000年之后主流的图像分割方法进行了研究,将之分为四类：基于图论的方法、基于聚类的方法、基于分类的方法以及结合聚类和分类的方法,对每类方法所包含的典型算法,尤其是该领域最近几年发表的最新文章的基本思想、优缺点进行介绍和分析。最后介绍了图像分割常用的基准数据集和算法评价指标,对比各种算法并总结全文,对未来可能的发展趋势进行了展望。     

图像分割述评：基本概貌、典型算法及比较分析

图像分割作为计算机视觉领域的一个重要分支,在可穿戴计算、自动驾驶、医学图像分析等方面都发挥着重要作用,并有着广泛应用。为了更好地了解图像分割领域的发展以及研究现状,该文对图像分割进行了深入梳理和系统述评。首先,对图像分割的含义以及其工作流程、指标等进行阐释;然后,对图像分割方法按照时间的跨度进行分类——基于阈值和区域、基于图论和聚类,以及基于深度学习的图像分割,对每类方法的代表性算法进行分析介绍,较为全面地总结了每类方法的基本思想和优缺点;最后,对该领域目前存在的问题和未来的发展方向进行展望,提出实时图像语义分割、弱监督或非监督语义分割和三维场景的语义分割是目前研究中的主要挑战。     

基于图论的Normalized Cut图像分割方法研究

基于图论的图像分割是近年来国际上研究图像分割算法领域中一个新的热点研究方向,Normalized Cut（规一化分割）是基于图论的分割方法中比较典型的一种。本文介绍Normalized Cut方法的相关内容,分析它的优缺点并提出几种有效的改进方法。最后,实验显示Normalized Cut在特定图片的分割上取得了不错的效果。     

图像分割研究进展

至今提出的分割算法有上千种,而新的算法还在不断被提出。从图像分割实际应用的角度,或者从图像分割中使用的特定的理论工具的角度,可以对图像分割进行分类。Otsu算法、基于聚类的图像分割方法、运动分割、基于图论的图像分割方法和基于活动轮廓的图像分割方法是图像分割的主要研究领域,自然计算算法已成为图像分割新的研究热点。     

基于图论的蚁群算法在图像分割的应用

针对传统的基于图论的图像分割方法分割效果不理想的问题,提出一种新的基于图论使用蚁群算法分割图像的算法。该算法基于图论,考虑了图像的灰度信息,采用蚁群算法的基本原理分割图像,使得分割出目标更为准确。     

基于图划分的图像直方图聚类分割

传统的基于图论的图像分割方法都是直接对图像灰度数据进行聚类分割,算法计算量较大。提出一种新的基于图论的直方图聚类分割算法,算法对图像直方图数据进行聚类,并由此得到分割阈值。由于输入值为直方图数据而不是图像灰度,数据量最大为 256而与像素数无关。实验研究表明,本方法在分割质量基本不变的情况下使得计算量大为减少。     

彩色图像色度距离权值的图论分割算法

提出利用色度距离特征权重的图论分割算法,对彩色图像进行区域分割分析。利用图论和HSI模型,解决自然灾害图像的分割问题。针对复杂的自然图像,将图像像素转换为图论中的节点,构造基于像素点HSI模型的带权无向图;构建带权无向图的图论分割权函数及分割准则,形成区域相似度判别方法;结合实际分割需求,对图论分割后的离散区域进行二次吸收与合并运算,获取连续兴趣区域;对分割的结果与其他算法进行了比较与分析。     

基于图论的彩色图像快速分割方法研究

基于图论的图像分割方法作为一种全局的分割方法,当图像的信息量增大时,问题求解将非常耗时.提出一种基于图论的彩色图像快速分割方法,该方法首先用区域生长法将彩色图像划分为内部相似的一些区域,再用最小支撑树MST(Minimum spanning tree)方法在这些区域之间进行分割,产生最终的分割图像.以彩色图像作为研究对象,实验结果表明,相对于传统的MST图论分割方法,该方法在取得较好分割效果的同时,提高了分割速度.     

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)

正~~