基于肤色和AdaBoost算法的彩色人脸图像检测*

针对肤色检测对复杂背景下的图像误检率高和AdaBoost算法对多姿态、多人脸图像检测效果不理想的问题,将基于肤色的人脸检测与基于AdaBoost算法的人脸检测结合起来,提出一种新的人脸检测方法,即首先利用肤色和形态学操作分割肤色区域,再根据人脸区域的统计特性筛选出人脸候选区域,然后用AdaBoost级联分类器对候选区域扫描,以精确定位人脸.实验表明,该方法同时具有肤色检测正确率高与AdaBoost算法误检率低的优点,可以有效地运用于多姿态、多人脸和复杂背景的情况,具有较好的检测效果.     

一种基于AdaBoost的人脸检测算法

针对常规基于肤色检测的AdaBoost算法的不足, 提出了一种改进的AdaBoost人脸检测算法,算法包括人体肤色模型、人脸运动检测模型、改进的背景提取方法、针对人脸区域的光照增强方法。算法综合利用了人体肤色信息和人脸运动信息,能有效缩小搜索范围。实验结果表明,该方法与常规基于肤色检测的AdaBoost方法相比,在保证检测性能的基础上,有效提高了检测速度。     

人脸检测算法的改进与仿真研究

研究提高人脸检测算法准确率问题,针对传统AdaBoost算法在人脸检测训练过程中出现的退化现象和识别率低的问题,提出了一种改进的AdaBoost人脸检测方法.在传统AdaBoost算法的基础上,通过假阳性对样本的权值进行动态更新,调节因子对调节权值进行修正防止其过分增大,通过判决阈值改善分类器识别能力.在CMU+MIT...     

复杂背景下的多人脸检测方法

复杂背景下采用肤色进行人脸检测具有较高的检测率,但同时也具有较高的误检率,而采用AdaBoost算法进行人脸检测从根本上解决了实时性问题,但是检测率不理想。基于上述原因,采用肤色分割与AdaBoost相结合的方法对人脸进行检测：首先采用肤色分割进行人脸粗定位,然后将粗定位后的人脸候选区域作为AdaBoost检测的输入子窗口进行人脸检测。在预处理过程中,采用可调节结构元素,解决了对于不同图像中大小不一的人脸采用固定的结构元素造成的人脸丢失问题。实验结果表明该方法在提高检测率的同时,也降低了误检率。     

基于BP神经网络的人脸检测AbaBoost算法

人脸检测在日常生产和应用非常重要。本文提出了一种基于BP神经网络的AdaBoost人脸检测算法。首先,使用BP神经网络代替YCbCr高斯模型建立肤色模型。同时,针对AdaBoost算法提出了一种新的权值更新方法。在权值更新中引入阈值与样本之间的距离。另外权重有一个边界值。最后,利用BP神经网络提取图像中的肤色候选区域,并采用改进的AdaBoost算法对图像中的人脸进行精确检测。实验结果表明,利用BP神经网络和改进的AdaBoost算法的新的解决方案比现有的方法具有更高的精度。     

基于肤色及AdaBoost算法的改进的人脸检测方法

提出一种结合肤色检测及AdaBoost算法的改进的人脸检测方法。首先利用肤色检测得出可疑的人脸区域,然后由改进的AdaBoost算法检测出人脸并标示,应用于智能监控系统中,并设置报警模块,可将可疑人脸信息记录入视频服务器。实验证明,肤色检测可以检测出复杂背景中的肤色区域,可以减少AdaBoost算法的扫描区域,进而减少检测时间;改进的AdaBoost算法在强分类器训练阶段加入判决函数,提高了人脸检测的准确性。     

基于肤色特征的AdaBoost人脸检测方法①

针对人脸检测准确率和实时性问题,提出了一种基于肤色特征的AdaBoost检测方法。通过将肤色特征应用到AdaBoost检测算法中,提高AdaBoost算法的检测率。实验结果表明,该算法能更好地实现多人脸检测,且减少计算量,保障了实时性的要求。     

基于肤色分割和AdaBoost算法的彩色图像的人脸检测

文章提出了肤色分割和AdaBoost算法结合的人脸检测算法。首先,对彩色图像进行肤色分割,通过人脸肤色的统计特征得到候选人脸区域：然后,基于AdaBoost算法,使用由强分类器组成的级联分类器对候选人脸区域进行扫描,最终得到精确定位的人脸。实验证明,该方法具有肤色检测快速和AdaBoost算法误检率低的优点,可以有效的运用于多姿态、多人脸和复杂背景的情况。     

基于AdaBoost算法与肤色模型的多姿态人脸检测

针对AdaBoost算法对多姿态人脸检测效果不理想和肤色模型对复杂背景下的图像误检率高的问题,本文将基于肤色的人脸检测与基于AdaBoost算法的人脸检测结合,提出一种由偏到正的检测方法.主要是通过旋转图片,使人脸分类器不会因为角度问题产生漏检,然后根据分类器检测出的两眼,计算两眼之间的位置关系,判断人脸是否处于正面位...     

基于肤色检测的AdaBoost人脸检测算法改进

AdaBoost人脸检测算法用于嵌入式实时高清视频时检测速度缓慢.为此,提出一种改进的人脸检测算法.对图像做肤色检测,将检测到的区域进行形态学处理,并作为感兴趣区域,完成AdaBoost人脸检测,以得到检测结果.实验结果表明,该算法在嵌入式系统上运行稳定,能提高检测速度和检测正确率.     

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