基于单类Kinect的人体三维重建与优化

使用单一运动的类Kinect深度相机重建和优化静态3D全身人体模型.首先针对类Kinect深度相机产生噪声原因提出一种降噪处理方法进行降噪.结合深度信息和RGB信息获取匹配块,使用高斯混合模型进行局部配准和逐层封闭曲线拟合方法进行全局配准,结合改进方向距离函数进行合并,最后使用泊松表面重建方法获取三维模型.实验结果表明,该方法能够重建出较高精度的三维人体模型.     

基于单台Kinect的高精度个性化人体建模方法

提出一种基于单台Kinect的高精度三 维人体建模方法。首先使用一台Kinect对人体头部进行扫描,以获取高精度的头部点云数据 ;其次,在保持头部精确度的基础上对所获取的点云数据进行采样预处理;最后利用层次化 的紧支撑径向基函数(CS-RBFs)将采样后的点云与已有的人体躯干进行拟合获得3D人体模型 。仿真结果表明,该方法能够提高人体模型的精确度并提高建模速度。     

基于Kinect的三维人体分块点云数据的拼接与模型重建

三维人体测量技术中,人体表面情况较为复杂以及存在视觉盲点,使得测量范围有限的Kinect技术无法通过一次测量完成对整个人体表面点云的获取工作。为了得到与原模型一致的分块点云数据和解决Kinect直接获取的点云坐标与实际不相符的问题,研究了基于Kinect对人体的不同区域的测量,首先推导出合理的坐标变换公式对点云进行处理。然后,使用三点对齐法和Delaunay三角剖分法实现分块点云的拼接和三维人体模型的重建。最后,运用Matlab平台进行仿真。实验结果表明,该算法简化了传统三维人体建模的复杂性,能够精确地提取人体深度图像,且模型的恢复程度较好。     

单Kinect+回转台的全视角三维重建

为了解决当前全视角三维扫描系统价格昂贵操作复杂的问题,提出利用1台Kinect和1个回转台来构建全视角三维模型的方法。研究涉及点云预处理、点云配准、全局误差修正以及色差修正等技术。首先使用Kinect采集数据并预处理,结合转台约束利用图像几何特征进行粗配准,随后使用迭代最近点（Iterative closest point,ICP）算法实现点云的精确配准。对于累积误差导致的闭环问题以及不同角度拍摄引起的色差问题,通过全局误差修正与色差修正算法处理,提升重建结果的精度。实验结果表明：该方法可以实现三维物体的全视角重建,并在精度上优于微软的KinectFusion方法。     

基于Kinect的轴类零件三维重建研究

使用Kinect采集的深度数据,进行了轴类零件三维重建算法的研究。首先借助Kinect获取深度和彩色数据,通过坐标转换将深度信息转换成三维点云数据;其次提取出感兴趣目标的点云数据,根据点云数据的噪声特点,并对其进行滤波降噪处理;然后进行点云分割获得点云集,最后对各点云集进行结构参数化分析。实验结果表明,本文算法能够精确、高效地实现轴类零件的重建。     

基于Kinect深度图像的三维重建

随着机器视觉理论的发展和硬件技术的进步,三维重建在生产、生活中的应用越来越广泛,基于Kinect传感器的三维重建得到广泛的应用。针对于现有的Kinect传感器获得的深度图像深度信息丢失的问题,提出了一种新的基于均值滤波的方法对深度图像进行去噪,并对深度图像进行预处理,获取三维点云,用迭代最近点(Iterative Closest Point,ICP)算法完成点云的精确配准,从而得到配准后物体表面三维点云,并完成物体的三维重建。     

基于深度扫描仪的高辨识度三维人体模型重建方法

3D 照相打印馆人像的打印质量取决于3D 扫描获得的三维人体模型的辨识度。然 而,由于现有3D 人体扫描仪价格昂贵、操作复杂等原因,使得3D 人像打印成本高、耗时长和 打印精度较低。针对这些缺点提出一种基于深度扫描仪重建高辨识度三维人体模型方法。利用 多组深度扫描仪分工协作、优势互补,分别获取高辨识度的人体面部五官点云数据,上半身与 全身表面轮廓点云数据。然后,通过引入特征点和改进的最近点迭代法将采集到的三组点云数 据进行对齐、替换、拼接,将拼接后的无拓扑关系的点云数据进行曲面重构即可获得高辨识度 的三维人体模型。该方法的扫描时间较短,以较低的成本构建了具有高辨识度的三维人像模型。     

基于Kinect的实物地质标本三维重建

基于多视点图像运动结构恢复的三维重建方法相当耗时且鲁棒性低,针对以上问题,提出了一种基于Kinect的实物地质标本的三维重建方法. 首先使用GrabCut算法提取前景目标,结合原始深度图像生成对应视角的点云,再基于SIFT特征利用RANSAC算法执行点云粗对准,然后在ICP算法中引入异常值拒绝方法和动态调整权重思想进行点云精细配准,最终重建出完整三维点云模型. 实验结果表明该方法能快速重建出良好的实物地质标本三维点云模型,能有效处理标本缺少结构特征的情况,并且鲁棒性高.     

基于二维点云图的三维人体建模方法

近年来基于二维图像的三维建模方法取得了快速发展,但就人体建模而言,由于摄像头采集到的二维人体图像包含衣物、发丝等大量的纹理信息,而像虚拟试衣等相关应用需要将人体表面的衣物褶皱等纹理信息去除,同时考虑到裸体数据采集侵犯了用户的隐私,因此提出一种基于二维点云图像到三维人体模型的新型建模方法。与摄像机等辅助设备进行二维图片数据集的采集不同,该算法的输入是由三维人体点云模型以顶点模式绘制的二维点云渲染图。主要工作是建立一个由二维点云图和相应的人体黑白二值图构成的数据集,并训练一个由前者生成后者的生成对抗网络模型。该模型将二维点云图转化为相应的黑白二值图。将该二值图输入一个训练好的卷积神经网络,用于评估二维图像到三维人体模型构建的效果。考虑到由不完整三维点云数据重建完整的三维人体网格模型是一个具有挑战性的问题,因此通过模拟二维点云的破损和残缺状态,使得算法能够处理不完整的二维点云图。大量的实验结果表明,该方法重建出的三维人体模型能够有效实现视觉上的真实感,为了对重建后的精度进行定量的分析,选取了人体特征中具有代表性的腰围特征作为误差评估;为了增加三维人体模型库中人体形态的多样性,还引入一种便捷的三维人体模型数据增强技术。实验结果表明,该算法只需要输入一张二维点云图像,就能快速创建出相应的数字化人体模型。     

基于Kinect v2三维重建的研究与实现

随着计算机视觉技术的蓬勃发展,三维模型重建成为研究热点。选用第二代Kinect作为三维模型重建的数据采集外设,获取具有深度信息的点云数据;然后用KinectFusion SDK对物体进行重建,并利用Matlab和Visual C++对点云数据进行降低噪声处理,并对三维点云数据进行Delaunay三角剖分,建立物体表面的拓扑关系,实现了三维物体的重建。     

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