基于局部中频Gabor滤波器组的人脸识别

针对传统Gabor滤波器组在人脸识别过程中特征提取时间长、计算量大的问题,提出一种利用局部Gabor滤波器组进行人脸图像中频特征提取的方法.选择中频带的Gabor滤波器构造局部中频Gabor滤波器组;提取局部Gabor中频特征;采用线性判别分析法(linear discriminate analysis,LDA)进一步提取Fisher特征,得到图像的Gabor+ Fisher特征,利用最近邻法进行人脸图像识别.基于ORL和AR人脸库的实验结果表明,基于此局部Gabor滤波器组的人脸识别方法较传统的Gabor特征提取方法降低了40％的特征维数,加快了特征提取速度,提高了人脸识别率.     

基于能量的自适应局部Gabor特征提取的人脸识别

为了解决传统Gabor滤波器组在人脸识别过程中特征提取时间长、计算量大的问题,从不同方向、不同尺度以及全局角度按照能量大小构建了3种不同的局部Gabor滤波器组用来提取人脸特征。首先,分析数据库中部分图像Gabor变换后的图像能量,从不同角度选出能量较大的图像构建对应的局部Gabor滤波器组; 其次,根据所选滤波器组提取局部Gabor特征; 然后,采用线性判别分析(LDA)法进一步提取Fisher特征; 最后,利用最近邻法识别人脸图像。基于ORL人脸库和YALE人脸库的实验结果表明提出的人脸识别方法降低了人脸图像的特征维数,缩短了特征提取的时间,有效地提高了人脸识别率。     

基于人脸识别的考勤系统的设计与研究

通过研究人脸识别,设计出一套用于考勤的系统。基于人脸识别的考勤系统中最主要的就是人脸识别;首先对通过摄像头拍摄获取的原始人脸图片进行图像预处理;然后通过对人脸的眼睛、鼻子和嘴巴的定位实现人脸定位;在定位后的人脸图片中将眼睛、鼻子、嘴巴的特征值提取出来;最后通过图片中提取的特征值和后台人脸特征数据库中的值进行比较来完成人脸的识别功能。     

基于Gabor小波和流形的人脸识别研究

本文研究基于Gabor小波变换和流形学习的人脸识别方法,首先引入Gabor小波对人脸图像提取不同方向、不同尺度的多个Gabor幅值特征（Gabor magnitude feature）,然后使用能够提取子流形的NPE算法对GMF特征进行维数约简,最后使用线性判别分析进一步提取鉴别性特征。此算法利用了Gabor特征对人脸图像的优异表征能力、流形方法和传统的判别方法。在标准人脸库上的实验结果表明,与其他降维方法相比,新算法能够获得较好的识别效果。     

基于彩色Gabor特征的人脸识别技术

提出了一种利用所提取的彩色Gabor特征来提高人脸识别系统性能的方法。首先利用四元数表示彩色信息,考虑到Gabor滤波器具有空间局部性和方向选择性的特点,将其扩展到四元数空间。然后通过人脸图像特征点与Gabor滤波器的卷积来提取特征,这样就将传统的灰度Gabor特征拓展为彩色Gabor特征。最后对于所提取的特征利用PCA降维后送入支持向量机中分类。实验采用彩色FERET人脸库并利用ROC曲线进行交叉检验,结果说明通过提取和利用这种彩色纹理信息能显著提高人脸识别系统性能。     

融合Gabor和Gist特征的人脸识别

为了进一步增强人脸识别系统的实用性,提高人脸识别率,提出了一种新的融合Gabor小波特征和Gist特征的人脸特征提取方法。对一幅人脸图像提取其多个尺度和方向的Gabor特征图,再对这些Gabor特征图进行处理,分别提取其Gist特征,接着再把所有Gabor特征图的Gist特征级联起来作为一人脸图像的特征向量,经过PCA方法降维处理,最后输入到支持向量机里面训练识别。通过在ORL和FERET人脸库中进行实验检测,结果表明与传统的PCA-SVM方法和Gabor特征提取方法相比,给出的方法可以大幅度提高人脸识别率。     

基于Gabor滤波器的快速人脸识别算法

针对传统人脸识别方法中所提取特征维数高、计算量大等缺点,提出一种新的正面人脸识别算法。新算法融合了半边人脸识别方法、Gabor滤波器、基于互信息判据的Gabor特征筛选来进行人脸识别。新算法将人脸图像分为左右两个部分,计算并比较人脸图像左右半边脸的熵,选取熵值较大的半边人脸图像进行Gabor特征提取。利用二值分类器判别单个Gabor特征的分类能力,选取分类能力较强的特征（最具判决力的特征）。再利用互信息判据对Gabor特征进行第二次筛选,以减小特征之间的冗余度。最后利用最近邻判别器来进行人脸识别。实验结果表明,新算法的识别率优于传统半边脸识别方法,识别速度也优于传统的利用Gabor滤波器进行特征提取的方法。     

人脸Gabor小波特征的鲁棒性研究

人脸识别可以归结为特征的提取,对于识别任务,最主要的是要提取图像的辨别特征,但图像辨别特征的提取难度很大.对人脸图像在不同光照、姿势条件下的Gabor小波特征进行研究,证明Gabor小波特征在人脸识别中的鲁棒性.     

基于光照变换的Gabor小波人脸识别

光照变化易使人脸图像的灰度分布不均,造成局部对比度差别较大,会引起人脸识别正确率下降。为此在同态滤波的基础上,改变滤波函数,提出了高斯滤波的人脸识别方法,接着对滤波后的图像直方图均衡化,来增加图像的灰度动态范围,然后对人脸图像提取Gabor小波特征,最后利用最近邻法识别人脸图像。在光照变换明显的Yale B和CMU PIE数据库识别效果最好,降低了人脸图像的特征维数,缩短了特征提取时间,有效地提高了人脸识别率。     

基于小波分析和几何特征的人脸识别方法研究

在主成分分析法(PCA)和独立成分分析法(ICA)等理论基础上,提出一种结合人脸几何特征和独立Gabor小波特征分析的人脸识别方法.在对人脸图像进行二维小波分解的基础上,从人脸图像的下采样Gabor小波图像中得到一个Gabor小波特征向量并利用PCA法降维,在ICA法的基础上得到独立Gabor小波特征,并结合人脸面部器官的位置和轮廓及器官距离等所构成的几何特征进行人脸识别.     

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)

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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