检索结果-南通市图书馆

A variational method for contour tracking via covariance matching

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2012年第11期55卷 2635-2645页

作者： WU YuWei,MA Bo & LI Pei beijing Laboratory of Intelligent Information technology,School of computer Science,beijing institute of technology,beijing 100081,china 1. beijing Laboratory of Intelligent Information technology School of Computer Science Beijing Institute of Technology Beijing 100081 China

This paper presents a novel formulation for contour *** model the second-order statistics of image regions and perform covariance matching under the variational level set ***,covariance matrix is adopted as a visual object representation for partial differential equation(PDE) based contour ***-Euclidean calculus is used as a covariance distance metric instead of Euclidean distance which is unsuitable for measuring the similarities between covariance matrices,because the matrices typically lie on a non-Euclidean manifold.A novel image energy functional is formulated by minimizing the distance metric between the candidate object region and a given template,and maximizing the one between the background region and the *** corresponding gradient flow is then derived according to a variational approach,enabling partial differential equations(PDEs) based contour *** on several challenging sequences prove the validity of the proposed method.

关键词： contour tracking covariance region descriptor level set Log-Euclidean Riemannian metric

Human knowledge acquisition from 3D interaction in virtual environments

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2012年第7期55卷 1528-1540页

作者： CHENG Cheng,JIANG Ru & DONG XueMei beijing Laboratory of Intelligent Information technology,School of computer Science,beijing institute of technology,beijing 100081,china 1. beijing Laboratory of Intelligent Information technology School of Computer Science Beijing Institute of Technology Beijing 100081 China

Recently,virtual environment (VE) based design and planning,which is a kind of interaction intensive computing,has shown great *** users of such systems are specialists or technicians and their 3D interactions with the system embed a great deal of knowledge and ***,how to integrate human knowledge and skills into VE is a great challenge to researchers in the human computer interaction *** paper proposes a method for acquiring user knowledge from *** main ideas and work include,abstracting the interactive process and formalizing the interactive semantics,as well as providing a semantic model of an interactive information repository,from which user interactive processes can be retrieved and all kinds of application logics can be established.A virtual assembly planning system is introduced as an example of a practical application of this *** show that the related models can well capture user knowledge and retrieve the interaction process.

关键词： human computer interaction interactive semantics virtual environment temporal logic virtual manufacturing virtual assembly

PARALLEL ROSENBROCK METHODS FOR SOLVING STIFF SYSTEMS IN REAL-TIME SIMULATION

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2000年第4期18卷 375-386页

作者： Li-rong Chen De-gui Liu (beijing institute of computer Application and Simulation technology, beijing 100854, china) 北京计算机应用与仿真技术所北京 100854

In this paper parallel Rosenbrock methods in real-time simulation are presented on parallel computers. Their construction, their convergence and their numerical stability are studied, and the numerical simulation expe... 详细信息

关键词： Rosenbrock methods stiff system real-time simulation parallel algorithms

Augmented reality registration algorithm based on nature feature recognition

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2010年第8期53卷 1555-1565页

作者： CHEN Jing 1 , WANG YongTian 1,2 , GUO JunWei 1 , LIU Wei 1 , LIN JingDun 1 , XUE Kang 1 , LIU Yue 1 & DING GangYi 31 School of Optoelectronics, beijing institute of technology, beijing 100081, china 2 School of computer Science and technology, beijing institute of technology, beijing 100081, china 3 School of Software, beijing institute of technology, beijing 100081, china 1. School of Optoelectronics Beijing Institute of Technology Beijing 100081 China2. School of Computer Science and Technology Beijing Institute of Technology Beijing 100081 China3. School of Software Beijing Institute of Technology Beijing 100081 China

This paper presents an improved key frame based augmented reality registration algorithm for real-time motion tracking in outdoor environment. In such applications, wide-baseline feature matching is a critical problem. In this paper, we apply randomized tree method to match key points extracted from the input image to those key frames as a classification problem. Extended Kalman filter is also utilized for jitter correction. A video see-through mobile augmented reality system is built for the on-site digital reconstruction of Yuanmingyuan Garden. Experimental results demonstrate that this algorithm is real-time, robust and effective for outdoor tracking.

关键词： outdoor augmented reality camera tracking randomized tree

A Multicast Protocol Utilizing On-demand Routing Strategy for MPRN

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

计算机工程 2002年第S1期28卷 109-112页

作者： YUAN Da , SONG Hantao(Dept. of computer Science and Engineering, beijing institute of technology, beijing 100081,china) Dept. of computer Science and Engineering Beijing Institute of Technology Beijing 100081China

This paper proposes a multicast protocol utilizing ondemand routing strategy for mobile packet radio network. It does not maintain permanent route tables with full topological views. Instead, multicast senders apply on-demand procedures to dynamically discover routes and build forwarding group in this protocol. The data packets are propagated by each forwarding ,group member via scoped floodingso the protocol can reduce network bandwidth overhead and avoid the propagation of potentially large routing updates throughout the network.

关键词： Mobile packet radio networkingMulticast protocolOn-demand routing Forwarding group

SUPERCONVERGENCES OF THE ADINI'S ELEMENT FORSECOND ORDER EQUATION

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1999年第6期17卷 569-574页

作者： Ping Luo(Department of computer Science and technology, Qinghua University, beijing 100084,china)Qun Lin(institute of Systems Science, Academia Sinica, beijing, 100080, china) Tsing Hua Univ Dept Comp Sci & Technol Beijing 100084 Peoples R China Acad Sinica Inst Syst Sci Beijing 100080 Peoples R China

n this papers the asymptotic error expansions of Adini's element for the secondorder imhomogeneous Neumann problem are given and the superconvergence estimations are obtained. Moreover, a numerical example to support ... 详细信息

关键词： Adini's element Superconvergence estimation Asymptotic expansion.

Entropy number and non-linear approximations on multivariate Besov space by manifolds of finite pseudo-dimension

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第3期16卷 260-265页

作者： LONG Jingfan and FANG Gensun (School of Mathematical Sciences, beijing Normal University, beijing 100875, china Department of computer Science, Information technology institute, beijing 100101, china) [a]School of Mathematical Sciences Beijing Normal University Beijing China [b]Department of computer Science Information Technology Institute Beijing China

We determine the asymptotic order of entropy number and optimal non -linear approximations of anisotropic periodic Besov class of Bpθr(Td') (1≤p≤∞,1≤0≤∞) by manifolds of finite pseudo-dimension in the metric Lq... 详细信息

关键词： Pseudo-dimension anisotropic Besov class of functions entropy number nonlinear width.

PARALLEL MULTI-STAGE & MULTI-STEP METHOD IN ODES

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2000年第2期18卷 157-164页

作者： Xiao-qiu Song (institute of computer Application and Simulation technology P.O.Box 3929, beijing 100854, china) 北京计算机应用与仿真技术所北京 100854

Presents information on a study which discussed the theory of parallel multi-stage and multi-step method, which is a form of combining Runge-Kutta method with linear multi-step method. Basic theory and equations; Appl... 详细信息

关键词： ordinary differential equations parallel simulation

Parallel Rosenbrock Methods for DifferentialAlgebraic Equations

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2001年第2期12卷 73-81页

作者： Fei Jinggao beijing institute of computer Application and Simulation technology 100854, P. R. china beijing institute of computer Application and Simulation technology 100854 P. R. China

A class of parallel Rosenbrock methods for differential algebraic equations are presented in this paper. The local truncation errors are defined and the order conditions are established by using the DA-trees and DA-series. The paper also deals with the convergence of the parallel Rosenbrock methods for h -> 0 and states the bounds for the global errors of the methods. Some particular methods are obtained by solving the order equations and a numerical example is given, from which the theoretical orders are actually observed.

关键词： D Differential- algebraic system Par algorithm Rosenbrock algorithm Rosenbrock method Convergence.