采用深度图像信息和SLVW的手语识别

为了实现手语视频中手语字母的准确识别,提出了一种基于DI_CamShift和SLVW的算法。该方法将Kinect作为手语视频采集设备,在获取彩色视频的同时得到其深度信息;计算深度图像中手语手势的主轴方向角和质心位置,通过调整搜索窗口对手势进行准确跟踪;使用基于深度积分图像的Ostu算法分割手势,并提取其SIFT特征;构建了SLVW词包作为手语特征,并用SVM进行识别。通过实验验证该算法,其单个手语字母最好识别率为99.87%,平均识别率96.21%。     

基于深度信息和SURF-BoW的中国手语识别算法

为实现视频中手语的准确识别,提出一种基于深度图连续自适应均值漂移(DI_CamShift)和加速强健特征词包(SURF-BoW)的中国手语识别算法.该算法将Kinect作为手语视频采集设备,在获取彩色视频的同时得到其深度信息.算法首先计算深度图像中手语手势的主轴方向角和质心位置,通过调整搜索窗口对手势准确跟踪;然后使用基于深度积分图像的OTSU算法分割手势并提取其加速强健特征(SURF),进而构建SURF-BoW作为手语特征并使用SVM识别.通过实验验证该算法在单个手语字母上的最好识别率为99.37%,平均识别率为96.24%.     

基于深度图像信息的手语识别算法

为了实现手语视频中手语字母的准确识别,提出了一种基于DI_CamShift和手语视觉单词（SLVW）的手语识别算法。首先采用Kinect获取手语字母手势视频及其深度信息;然后通过计算获得深度图像中手语手势的主轴方向角和质心位置,计算搜索窗口对手势跟踪;进而使用基于深度积分图像的Ostu算法分割手势并提取其尺度不变特征转换(SIFT)特征;最后构建SLVW词包并用支持向量机(SVM)进行识别。单个手语字母最好识别率为99.67%,平均识别率96.47%     

基于手语视觉单词特征的手语字母识别研究

为有效识别手语字母,提出一种手语视觉单词(SLVW)的识别方法。采用Kinect获取手语字母视频及其深度信息,在深度图像中,通过计算获得手语手势的主轴方向角和质心位置以调整搜索窗口,利用基于深度图像信息的DI_CamShift方法对手势进行跟踪,进而使用基于深度积分图像的Ostu方法分割手势,并提取其尺度不变特征变换数据。将局部特征描述子表示的图像小区域量化生成SLVW,统计一幅手语图像中的视觉单词频率,用词包模型表示手语字母,并用支持向量机进行识别。实验结果表明,该方法不受颜色、光照和阴影的干扰,具有较高的识别准确性和鲁棒性,对复杂背景手语视频中的30个手语字母的平均识别率达到96.21%。     

基于GLCM和Gabor纹理特征的手势识别算法

针对手势灰度图像的纹理特征富含手势类别信息的特点,提出一种基于融合GLCM(灰度共生矩阵)和Gabor小波变换提取手势图像空、频域纹理特征的手势识别方法。构建手势灰度图像的多方向共生矩阵,并计算多方向共生矩阵的特征参数来提取手势纹理的GLCM特征;通过手势灰度图像的Gabor小波变换来提取手势纹理的Gabor特征;对所提取的两种特征进行归一化处理后串联构建手势纹理特征向量;使用基于稀疏自动编码器和softmax分类器的深度堆栈自编码网络对构建的手势纹理特征向量进行分类识别。实验表明:该方法具有较高的识别率和较好的鲁棒性,对15种手势的平均识别率达到97.4%,能够满足人机交互对手势识别的要求。     

基于Kinect的指尖检测与手势识别方法

针对基于视频的弯曲指尖点识别难、识别率不高的问题,提出一种基于深度信息、骨骼信息和彩色信息的手势识别方法。该方法首先利用Kinect相机的深度信息和骨骼信息初步快速判定手势在彩色图像中所在的区域,在该区域运用YCrCb肤色模型分割出手势区域;然后计算手势轮廓点到掌心点的距离并生成距离曲线,设定曲线波峰与波谷的比值参数来判定指尖点;最后结合弯曲指尖点特征和最大内轮廓面积特征识别出常用的12个手势。实验结果验证阶段邀请了6位实验者在相对稳定的光照环境条件下来验证提出的方法,每个手势被实验120次,12种手势的平均识别率达到了97.92%。实验结果表明,该方法能快速定位手势并准确地识别出常用的12种手势,且识别率较高。     

基于Kinect骨架信息的交通警察手势识别

针对现有的手势识别算法识别率低、鲁棒性弱的问题,提出一种基于Kinect骨架信息的交通警察手势识别方法。从Kinect深度图像中预测人体骨架节点的坐标位置,将节点的运动轨迹作为训练和测试的特征,结合距离加权动态时间规整算法和K-最近邻分类器进行识别。实验表明,在参数最优的情况下,该方法对八种交通警察手势的平均识别率达到98.5%,可应用于智能交通等领域。     

基于Kinect的手语识别方法

为实现基于Kinect的手语识别,提出了一种利用有限状态机及动态时间规整(DTW)的动态手语识别方法。首先,利用Kinect技术得到人体深度图像和骨骼特征信息;然后利用手部分割算法得到手部深度图像,再选取识别正确率高的梯度方向直方图(HOG)特征算子来提取手部特征;最后加入有限状态机和DTW算法实现动态手语识别。实验结果表明:该方法能够实现对常用手语单词、句子的识别,识别准确率可达95%。     

基于新投影策略的人体行为识别方法研究

为解决微小动作识别率低的问题,提出一种结合新投影策略和能量均匀化视频分割的多层深度运动图的人体行为识别方法。首先,提出一种新的投影策略,将深度图像投影到三个正交笛卡尔平面,以保留更多的行为信息;其次,基于整个视频的多层深度运动图图像虽然可反映整体运动信息,但却忽略了很多细节,采用基于能量均匀化的视频分割方法,将视频划分为多个子视频序列,可以更加全面地刻画动作细节信息;最后,为描述多层深度运动图图像纹理细节,采用局部二值模式作为动作特征描述子,结合核极端学习机分类器进行动作识别。实验结果表明：在公开动作识别库MSRAction3D和手势识别库MSRGesture3D上,本文算法准确率分别达94.55%和95.67%,与现存许多算法相比,有更高的识别率。     

面向人机交互的手势识别系统设计

在人机交互领域(Human-Computer Interaction,HCI)中,基于视觉的手势识别因其直观、高效的特点拥有广阔的应用前景。为了改善传统手势识别算法识别率低、鲁棒性差的缺点,基于OpenCV和Keras深度学习框架提出一种简单、快速的手势识别方法作为人机交互的接口。手势图像经过3个处理阶段:预处理、特征提取和分类。对输入图像进行预处理,使用YCbCr肤色模型提取出手部肤色区域,将其转化为灰度图像。使用卷积神经网络对手势图像进行特征提取和分类。实验结果表明:提出的手势识别方法识别率很高,达到99.43%,且具有较好的鲁棒性。与传统的人工选取特征相比,卷积神经网络能够有效地进行特征学习。     

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.     

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.     

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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