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检索条件"机构=Beijing Key Laboratory of Multimedia and Intelligent Software Technology College of Computer"

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Adaptive particle size setting and normal calculation methods in fluid rendering

Adaptive particle size setting and normal calculation method...

引用

4th International Conference on Digital Home, ICDH 2012

作者： Wang, Pengcheng Kong, Dehui Zhang, Yong Yin, Baocai Beijing Key Laboratory of Multimedia and Intelligent Software Technology College of Computer Science and Technology Beijing University of Technology Beijing China

ISBN: (纸本)9781467313483

In this paper, we present an adaptive particle size setting method in Lagrangian-approach based screen space splatting algorithm in real-time fluid rendering. The particle radius will be adjusted according to its Weber number and local density in the rendering process so that a large radius of peaceful fluid particle can help to eliminate a bumpy surface artifact, and a small radius can prevent obviously spherical shapes of particles in splash. We also propose an adaptive normal calculation method to avoid the numerical calculation errors in normal computation process. An adaptive sampling interval is set in accordance with the viewing distance from camera to the fluid so that fuzzy edges or double image effect in a fixed sampling interval normal computation process could be prevented. Both of the two approaches introduced in this paper take only small amount of computing time and will have little impact on the time consuming property of a real-time fluid rendering application. © 2012 IEEE.

关键词： Particle size

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Interpolating subdivisions based on difference interpolating functions

Interpolating subdivisions based on difference interpolating...

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4th International Conference on Digital Home, ICDH 2012

作者： Yin, Baocai Zhang, Yong Kong, Dehui Wang, Lichun Beijing Key Laboratory of Multimedia and Intelligent Software Technology College of Computer Science and Technology Beijing University of Technology Beijing 100124 China

ISBN: (纸本)9781467313483

Subdivision algorithm defines a very powerful way of constructing smooth, continuous, seamless surface. This paper proposed to construct families of interpolating subdivision from approximating subdivision by combining an approximating scheme with a difference interpolating function. By combining Loop subdivision with two-point linear interpolation, the modified Butterfly scheme is generated. Additionally, a new interpolating subdivision scheme, Loop-Butterfly, was constructed by combining Loop subdivision with Butterfly interpolation. The results show that the proposed method keeps the fairing surface of approximating schemes. © 2012 IEEE.

关键词： Interpolation

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Study on dynamic labeling of building in 3D virtual city

Study on dynamic labeling of building in 3D virtual city

引用

2012 IEEE Symposium on Electrical and Electronics Engineering, EEESYM 2012

作者： Huang, Yaoda Kong, Dehui Zhang, Yong College of Computer Science and Technology Beijing University of Technology Beijing Municipal Key Laboratory of Multimedia and Intelligent Software Technology Beijing China

ISBN: (纸本)9781467323659

In order to improve the readability of scene, this paper presents a method of dynamic labeling of buildings in 3D virtual city. This method, based on 3D buildings model, sets up candidate positions for labeling first, and then computes the visibility of the samples in the candidates and comprehensive evaluation in real time, finally embeds labels in the optimal positions. The results show that the method effectively improves the scenes readability in 3D city models, and achieve real-time and aesthetic requirements. © 2012 IEEE.

关键词： Three dimensional computer graphics

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Two dimensional K-SVD for the analysis sparse dictionary

Two dimensional K-SVD for the analysis sparse dictionary

引用

13th Pacific-Rim Conference on multimedia, PCM 2012

作者： Shi, Yunhui Qi, Na Yin, Baocai Ding, Wenpeng Beijing Key Laboratory of Multimedia and Intelligent Software Technology College of Computer Science and Technology Beijing University of Technology 100124 Beijing China

ISBN: (纸本)9783642347771

Analysis sparse model has been successfully used for a variety of tasks such as image denoising, deblurring, and most recently compressed sensing, so it arouses much attention. K-SVD is a mature dictionary learning approach for the analysis sparse model. However, it represents images as one dimension signals, which results in mistakes of spatial correlations. In this paper, we propose a novel analysis sparse model, where analysis dictionary derived from two analysis operators which act on an image, leading to a sparse outcome. And a two dimensional K-SVD (2D-KSVD) is proposed to train the analysis sparse dictionaries. Experiments on image denoising validate that the proposed analysis dictionary can express more image spatial and frequency characteristics and by using the dictionary, the two dimension analysis sparse model outperforms the traditional analysis model in terms of PSNR. © 2012 Springer-Verlag.

关键词： Image denoising

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Rule-based procedural modeling of buildings

Rule-based procedural modeling of buildings

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2012 IEEE International Conference on computer Science and Automation Engineering, CSAE 2012

作者： Li, Jiazhen Zhang, Yong Kong, Dehui Beijing Municipal Key Laboratory of Multimedia and Intelligent Software Technology College of Computer Science Beijing University of Technology Beijing 100124 China

ISBN: (纸本)9781467300865

The demand of virtual 3D models is growing rapidly with the development of city informatization and digitalization. Buildings are essential objects of virtual city. Over the years, researchers have made considerable progress towards developing efficient techniques for generating 3D buildings, however, procedural modeling is still a challenging task because of limitation of data sources and reality requirement restraints. To overcome this problem, this paper introduces a procedural method based on rule sets according to certain criterion available to common building all over the world. We describe the modeling processing based on two-dimension GIS data and digital image. The experiments showed that the presented approach is an automatic and effective method for modeling mass buildings. © 2012 IEEE.

关键词： Buildings

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H_∞ filtering with Diagonal Interacting Multiple Model Algorithm for Maneuvering Target Tracking

H_∞ filtering with Diagonal Interacting Multiple Model Algo...

引用

American Control Conference

作者： X. Fu Y. Jia J. Du J. Zhang W. Li X. Liu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunication school of Electronic and Information Engineering Beihang University (BUAA) Department of Automatic Beijing Information and Science of University

ISBN: (纸本)9781479901777

This paper is devoted to the problem of state estimate of discrete-time stochastic systems with Markov jump parameters. A robust algorithm-diagonal interacting multiple model algorithm based on H_∞ filtering (DIMMH) is presented for maneuvering target tracking when measurement noise is of unknown statistics. Extensive Monte Carlo simulations show the effectiveness and superiority of the proposed algorithm.

关键词： Maneuvering Target Tracking Markov jump parameters effectiveness Target tracking maneuvering target State estimation Filtration tracking Noise measurement Diagonal Monte Carlo technique

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Finite-time consensus control for multiple manipulators with unmodeled dynamics

Finite-time consensus control for multiple manipulators with...

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American Control Conference

作者： Bin Zhang Yingmin Jia Junping Du Jun Zhang Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electronic and Information Engineering Beihang University (BUAA) Beijing 100191 China

ISBN: (纸本)9781479901777

This paper is devoted to the finite-time control problem for multiple manipulators, where unmodeled dynamics is taken into consideration. An effective coordinated control strategy is introduced, under which distributed protocols with continuous feedbacks are proposed. By applying the homogeneous theory for stability analysis, it is proven that the multi-robot system can be globally finite-time stabilized through our protocols. Numerical simulations on four manipulators with two degrees of freedom are presented to validate the effectiveness of the control strategy.

关键词： unmodeled dynamics control strategy Manipulators two degrees of freedom multi-robot systems Stability analysis distributed protocol

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PHD filter for multi-target tracking by variational Bayesian approximation

PHD filter for multi-target tracking by variational Bayesian...

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IEEE Annual Conference on Decision and Control

作者： Wenling Li Yingmin Jia Junping Du Jun Zhang Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electronic and Information Engineering Beihang University (BUAA) Beijing 100191 China

ISBN: (纸本)9781467357159

In this paper, we address the problem of multitarget tracking with unknown measurement noise variance parameters by the probability hypothesis density (PHD) filter. Based on the concept of conjugate prior distributions for noise statistics, the inverse-Gamma distributions are employed to describe the dynamics of the noise variance parameters and a novel implementation to the PHD recursion is developed by representing the predicted and the posterior intensities as mixtures of Gaussian-inverse-Gamma terms. As the target state and the noise variance parameters are coupled in the likelihood functions, the variational Bayesian approximation approach is applied so that the posterior is derived in the same form as the prior and the resulting algorithm is recursive. A numerical example is provided to illustrate the effectiveness of the proposed filter.

关键词： Nickel

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State estimation for jump Markov linear systems with uncompensated biases

State estimation for jump Markov linear systems with uncompe...

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American Control Conference

作者： Wenling Li Yingmin Jia Junping Du Jun Zhang Deyuan Meng Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China. Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electronic and Information Engineering Beihang University (BUAA) Beijing 100191 China

ISBN: (纸本)9781479901777

This paper studies the problem of state estimation for jump Markov linear systems with uncompensated biases. By describing the state and the measurement biases as additive random variables, a suboptimal filter has been developed by applying the basic interacting multiple model (IMM) approach. To derive a precise representation of the biases contributions to the state estimation, three auxiliary matrices are introduced with respect to the correlation between the state estimation errors and the biases, which helps to derive mode-conditioned estimates in the framework of the IMM. A numerical example involving tracking a maneuvering target is provided to compare the performance of the proposed filter with that of the augmented state filter.

关键词： Jump Markov linear system Interacting multiple model Uncompensated bias State estimation Bias uncompensated maneuvering target Linear system interacting boson model Markov jump IMM

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Diversified gesture generation for Chinese sign language animation

Diversified gesture generation for Chinese sign language ani...

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4th International Conference on Digital Home, ICDH 2012

作者： Li, Jinghua Yin, Baocai Wang, Lichun Kong, Dehui Wang, Yufei Beijing Key Laboratory of Multimedia and Intelligent Software Technology College of Computer Science and Technology Beijing University of Technology Beijing. 100124 China

In concatenating-based sign language synthesis, sign language words are usually captured in context free environment to construct database, and then the words corresponding with the input nature text are selected from the database and concatenated into sentences for synthesis. One problem here is that sign language words would exhibit diversified expression while embedded in different context. Including all kinds of expression for all sign language words is infeasible due to the difficulty in capturing, reserving and retrieving. Based on formatted sign language description and nonlinear magnification, this paper proposes a novel diversified gesture generation method for sign language expression in different context. Our method trains a computing model for diversified sign language gesture in "emphasis" context based on the data in the neutral state and the biggest intensity of emphasis collected from the teacher of deaf, and generates sign language gesture with any intensity of "emphasis" from the model and the data in neutral state, which makes the synthesized sign language animation more accurate and intelligible. © 2012 IEEE.

关键词： Animation

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