基于图像的车牌识别

基于图像的车牌识别是图像识别领域的重要研究课题之一。本论文采用MATLAB编程实现该车牌识别系统,综合使用多种方法提高系统的有效识别能力。首先,对图像进行预处理。其次,采用了一种结合字符边缘和形态学的车牌定位算法。接着,根据分割出的车牌区域,采用一种水平和垂直投影相结合的车牌字符分割法,完成单个字符的分割。最后,运用模板匹配的方法实现字符识别。     

复杂背景下的车牌定位和字符分割研究

提出了一种综合边缘检测、投影特征的车牌定位方法和基于垂直投影及模板匹配的字符分割方法，提取车牌灰度图像边缘，实验结果显示该算法检测边缘的速度快，车牌区域轮廓清晰，采用投影法确定车牌区域，用HOUGH变换检测倾斜角度进而对倾斜的车牌进行矫正，通过字符分割算法对车牌字符进行切割，有效地解决了复杂环境的干扰、车牌尺寸变化等问题。对不同背景下的光照车牌进行了大量实验，结果表明该算法能准确地进行车牌定位以及字符分割，具有较好的鲁棒性。     

基于MATLAB车牌字符分割的算法研究

车牌字符分割一直是智能交通领域的一个重要研究方向。在实际应用中有其独特的价值。本文主要研究的是车牌字符的分割算法,应用MATLAB软件,进行深入的分析和仿真研究。为将车牌字符分割为单个字符,首先经过连通域寻找到字符的宽度,然后按照投影的方法找到分割点的位置,最后再通过宽度创建模板以此来进行分割。文中,将连通域法、垂直投影法、模板匹配法相结合,适用于任何通用情况下,算法合理,实验结果表明在理想测试条件下,可以取得较好的分割结果。     

投影和模板匹配相结合分割车牌字符

提出了一种解决断裂、粘连、污损和部分遮挡车牌字符的分割算法.结合字符牌照的特征,对校正后的车牌图像进行投影,处理断裂和粘连的字符,实现字符初次分割.在初次分割的基础上,设计匹配模板对初次分割下来的车牌图像进行模板匹配,寻求误差最小的模板对字符重新分割.实验结果表明,该方法自适应性强,有很强的鲁棒性,可以获得最优的分割效果.     

基于新模板的算法在车牌字符分割中的应用

针对以往车牌字符分割算法在复杂情况下分割准确率低的问题,提出了一种基于新邻域模板的连通域算法的车牌字符分割算法。采用基于新模板的连通域算法粗分割字符;通过自适应阈值投影法进行字符细分割;同时使用区域合并算法保证字符的完整性。实验结果表明,该算法将连通域法与投影法有效结合,能够同时解决汉字不连通、字符粘连和边框粘连等复杂情况,该算法对车牌字符进行分割正确率达99.5%。     

应用于社区安防的车牌识别门禁系统关键技术研究

对应用于社区安防的车牌识别门禁系统关键技术,采用基于染色矩阵算法对门禁系统拍到的车牌图像进行边缘检测,可避免反复的数据建模过程,又能减少图像处理时间;针对我国车牌的汉字、字母和数字字符共存的特点,采用垂直投影字符分割与模板匹配相结合的方法分别对车牌图像中的字母、数字字符和汉字字符进行分割,提高了车牌字符分割精度;改进了应用于车牌识别上BP神经网络（Back Propagation Neural Network）识别技术,引入了陡度因子,使网络能够快速收敛,减少运算时间。实验表明,该车牌识别门禁系统关键技术可广泛应用在现代社区中,也可以为社区门禁系统生产厂家提供技术支撑。     

基于小波变换和反馈的车牌字符分割

提出一种基于小波变换和反馈的车牌字符分割算法.首先,对车牌图像进行预处理;其次,根据车牌图像的垂直投影进行字符粗分割;最后,通过两级反馈进行字符精分割.第一级反馈是字符个数与字符宽度反馈,第二级反馈是字符识别反馈.在字符识别反馈中,对字符区域图像的垂直投影进行小波变换,利用其低频系数重构垂直投影;最后根据纹理特征进行字...     

最大类间方差车牌字符分割的模板匹配算法

提出一种基于模板匹配的最大类间方差车牌字符分割算法。根据字符串的结构和尺寸特征，设计了车牌字符串模板，该模板在车牌区域滑动匹配进行分类，并结合最大类间方差判决准则，确定最佳匹配位置，分割车牌字符。实验表明，该方法自适应性强，可以获得最优的分割效果。     

退化车牌字符的两级分割算法研究

为了准确进行车牌字符分割,提高车牌字符识别的准确率,提出了一种改进的车牌字符分割算法.对定位出来的车牌进行有效预处理,通过两级字符分割算法对车牌进行单字符分割.第一级字符分割是结合连通域分析法和垂直投影进行字符粗分割,第二级字符分割是基于车牌字符的先验知识通过多次判断进行车牌字符精分割.实验结果表明,该算法对受到光照不均、污迹、字符粘连和断裂、质量退化等严重影响的车牌字符能进行很好的分割.     

基于多尺度模板匹配和神经网络的车牌识别

针对现有车牌字符分割算法和识别问题的分析,本文采用一种多尺度模板匹配的车牌字符分割算法;并在此分割基础上采用小波神经网络算法识别车牌字符。实验表明该分割与识别方法的结合实现了切分准确、鲁棒性强、去伪性好和快速准确识别的高效性。     

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.     

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~~     

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