基于ICONDENSATION算法的人手跟踪与手势识别算法

为实现基于手势的智能人机交互,提出了一种基于视觉的人手跟踪与手势识别算法.该方法以ICONDENSATION算法为基础,融合颜色与深度信息进行重要采样,结合轮廓信息并通过ASM模型的能量函数进行观测,根据最大后验概率对几种预定义的手势进行识别.实验结果表明,该算法能够有效地实现复杂背景下的人手跟踪与手势识别,为进一步实现智能人机交互奠定了基础.     

基于ICODENSATION算法的人手跟踪与手势识别算法

为实现基于手势的智能人机交互，提出了一种基于视觉的人手跟踪与手势识别算法．该方法以ICON—DENSATION算法为基础，融合颜色与深度信息进行重要采样，结合轮廓信息并通过ASM模型的能量函数进行观测，根据最大后验概率对几种预定义的手势进行识别．实验结果表明，该算法能够有效地实现复杂背景下的人手跟踪与手势识别，为进一步实现智能人机交互奠定了基础．     

应用计算机视觉的动态手势识别综述

从手势识别系统框架模型、手势分割、手势建模与分析和手势识别等几个方向,系统地综述当前计算机视觉动态手势识别技术的研究现状,分析其存在的不足,提出了进一步研究的问题.结果表明:基于简易可穿戴设备的手势识别、基于深度视觉传感器的手势识别和多方法交叉融合的手势识别将是未来该领域的发展趋势.     

基于CW-RNNs网络的手势识别算法

该文在分析表征手势特征和神经网络理论基础上,根据手运动轨迹的连续性规律来研究适用于手势识别的关键技术——基于手势轨迹模型的新型神经网络算法。针对手势识别的模糊性和准确性问题,基于手势局部区域跟踪结果,采用一种新型神经网络算法,实现用于人机交互的动态手势识别。手势识别部分的研究是采用一种新型的循环神经网络(CW-RNNs)对手势运动的轨迹进行识别。根据跟踪部分提取的手指运动轨迹坐标,定义手势模版,采用该方法对手势模版进行学习。首先定义连续动态手势模版,采用时间频率循环神经网络对手势模版进行学习,对每组孤立的动态手势模版进行学习,形成手势识别模型。对影响CW-RNNs模型的因素进行了实验验证和深度分析,通过与多层RNNs、三层RNNs的识别效果进行比较,论证了本文模型对手势轨迹模版识别的优越性。     

用于稳态视觉诱发电位目标识别的多尺度特征融合卷积神经网络方法

针对传统稳态视觉诱发电位(SSVEP)脑电信号目标识别方法分类精度低、提取特征不充分、方法复杂且耗时等问题,提出一种基于多尺度特征融合卷积神经网络的SSVEP信号分类识别方法(SSVEP-MF)。利用小波变换将多通道SSVEP信号整合转化为二维图像作为输入样本集;建立多尺度特征融合卷积神经网络模型(MFCNN),该模型利用三层二维卷积核实现图像样本不同尺度特征的充分提取,构建多尺度特征融合单元对不同层级特征进行融合,并通过全连接等操作完成模型的训练;将样本集输入到MFCNN模型中实现脑电信号特征自适应提取及端到端分类。所提SSVEP-MF方法能够充分提取信号各层级特征,实现短时间视觉刺激下SSVEP信号的有效识别,并具有较高的目标识别效率。实验结果表明,在1 s刺激时长时,相比传统功率谱密度分析方法、典型相关分析方法以及普通卷积结构方法,所提方法的识别准确率分别提升了18.57%、20.08%及7.03%,有效提高了基于稳态视觉诱发电位范式下脑机接口的信号识别性能。     

Kinect骨骼信息下的动态手势识别研究

针对复杂环境中存在的手势识别问题,提出一种利用Kinect传感器获取深度信息并进行动态手势识别的方法。该方法通过对Kinect传感器获取的深度信息进行分析,获取人体主要骨骼点的3D坐标,从中选取六个点作为手部运动的特征参照;为提高手势识别系统的识别速度,提出了一种基于查表的DTW算法对得到的特征数据进行模板训练并实现动态手势识别。实验结果表明:该方法具有较高的识别速度和识别率,对复杂背景及光照强度变化具有较强的鲁棒性。     

基于高斯混和模型与Blob分析的人手定位

在基于机器视觉的手势识别研究中,手势分割与定位是关键技术。本文在分析肤色的颜色特征和人手运动特性的基础上,提出了一种在视频图像序列中实现手势分割和定位的算法。首先结合肤色检测技术和基于高斯混合模型的运动目标检测技术,获得了图像序列的初始手势区域,之后利用Blob技术实现了最终手势的分割和定位。实验结果显示,该方法具有较高的分割和定位准确度。     

基于车载毫米波雷达动态手势识别网络

基于Transformer提出一种车载毫米波雷达手势识别方法，可用于车内人员进行人机交互.毫米波雷达信号不受车内光照变化影响，同时能够保证乘客隐私.首先，毫米波雷达采样信号经过二维傅里叶变换和滤波获得距离—多普勒（RDM）和距离—角度图(RAM)；然后，将连续多帧RDM和RAM经过三维卷积网络后进行特征融合与拼接得到特征向量，利用Transformer模块进行位置和序列编码；最后通过全连接层获得手势概率分布向量.采集了基于实际路况和多种干扰环境下的雷达数据制作了手势识别分类的数据集，实验结果表明该方法可以有效的检测与识别多种典型手势，识别准确率可以达到97.14%以上.     

基于深度图像HOG特征的实时手势识别方法

手势识别是模式识别领域的一个热点研究方向。提出了一种利用Kinect传感器深度图像进行手势分割的方法,并研究了基于灰度图像HOG特征的手势识别模型;深入研究了HOG特征,分析其特征向量特点,探讨了不同特征维数对训练机的影响及处理效率;通过SVM机器学习方法实现手势的分类识别,经过对大量实验样本的优化训练,获得了最优SVM参数,并进行分析、对比识别率。本文方法维数少、识别率高、运行速度快、性能稳定,能满足实时性手势识别的要求。     

基于手势识别的智能输入系统

随着虚拟环境的发展,人机交互中键盘远远不能满足人们的要求,本文提出了一种基于手势识别方法的智能输入算法.该算法采用肤色分割提取出手部区域,检测大拇指和伸出的手指数目识别出手势的含义,把各种手势组合起来实现智能输入.该算法能够使用户根据自己的习惯来定义手势,更好的实现人机交互.实验结果表明该算法对获取手势图片时的外界干扰具有一定的鲁棒性,并能达到较高的成功率.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.