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2012 IEEE International Conference on Information Science and technology, ICIST 2012

作者： Li, Rongfeng Ding, Yelei Li, Wenxin Bi, Minghui Ministry of Education Peking University Beijing 100871 China State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing 100871 China School of Arts Peking University Beijing 100871 China

ISBN: (纸本)9781457703454

Gongchepu, one of the widely-used traditional Chinese musical scores, is hard to read due to the immeasurable rhythmic rule, which only presents a general rhythmic structure while the duration of each note is determined by performer according to the context of the melody. Experience of determining the duration of each note is passed down via oral tradition, and there are few experts who can read such musical score now. However, by capitalizing on classification methods, such as Naïve Bayes and Maximum Entropy Model, rhythms of gongchepu can be lab.led and interpreted into staff automatically, making it much easier to read. A precision of 85.63% is achieved in experiments. As an attempt to solve the rhythmic immeasurability problem in the study of musical score with the application of statistical model, this work is conducive to the preservation of Chinese traditional cultural heritage. © 2012 IEEE.

关键词： Historic preservation

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The evolution of virtual reality therapy

The evolution of virtual reality therapy

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Proceedings of the International Conference on Imaging Science, Systems and technology, CISST'03

作者： North, Max M. Virtual Reality Technology Lab. Computer Science and Info. Systems Kennesaw State University 1000 Chastain Road Kennesaw GA 30144-5591 United States

virtual reality Therapy (VRT) continues to show a strong presence in mainstream research. It appears to be attracting more scientists, researchers and clinicians to this innovative paradigm. Due to this enthusiastic interest, the author has prepared this paper to shade light on this uncharted field. It is the author hope that more research will be conducted to help the many people who suffer from psychological disorders. This paper briefly attempts to summarize the recent and current active VRT research in various research lab.ratories. It also provides some direction and innovative ideas for the next generation of VRT applications. Readers must note that the author is pointing out the next immediate practical applications of VRT and are by no means limiting the potential of the VRT paradigm.

关键词： virtual reality

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Harmonic Retrieval and Simulation of Aircraft Engine Noise

Harmonic Retrieval and Simulation of Aircraft Engine Noise

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International Conference on Computer Research and Development (ICCRD)

作者： Yang Yang Shuling Dai Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

Engine aerodynamic noise is a complex component of flight simulation, consisting of multiple groups of harmonics and broadband noise signals based on passing frequency. Harmonic simulation can effectively convey human auditory perception but lacks related study in flight simulation. To accurately simulate the acoustic behavior of harmonic noise, first, a high-order cumulant based pre-filtering method is applied to retrieve harmonic signals from the real engine noise recordings by exploiting the blindness of the third-order cumulants to the harmonic signal. Then, targeting the lower precision of the autoregressive (AR) coefficients in the pre-filtering calculations, a maximum likelihood method is proposed to estimate the ARMA parameters of the high-order cumulants. The simulation results show that the accuracy of AR parameter estimation is significantly improved compared to the moment estimation method. Finally, the exact frequency is verified and obtained based on first-order cyclic statistics, and then the harmonic signal in the time domain is extracted.

关键词： Time-frequency analysis Maximum likelihood estimation Atmospheric modeling Simulation Aerospace simulation Harmonic analysis Frequency estimation

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Synthesis and Editing of Human Motion with Generative Human Motion Model

Synthesis and Editing of Human Motion with Generative Human ...

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International Conference on virtual reality and Visualization

作者： Chengyu Guo Songsong Ruan Xiaohui Liang State Key Lab. Of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376747

In this paper, a generic approach is presented to constructing generative motion model from prerecorded motion data that allows the synthesis of new motions or modification of existing motions in various ways. The key idea is to decompose human motion data into a series of latent variables which decompose a number of sports from different properties, in the way motion variations are interpreted by modeling human motion data in the Gaussian process. The effectiveness and flexibility of this approach in experiments and applications are demonstrated by constructing two generative motion models as an example of various kinds of motion properties.

关键词： character animation generative motion models motion editing and synthesis

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An efficient algorithm unifying MHT and Multiple Model approaches

An efficient algorithm unifying MHT and Multiple Model appro...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Weihua Liu Yongjia Zhao Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376839

Main principles for multiple target tracking are data association and state estimation. Multiple Hypothesis Tracking (MHT) and Multiple Models (MM) methods have been the prevailing data association and state estimation methods for maneuvering targets tracking. A MM/MHT algorithm which incorporates multiple model mechanics into MHT framework has been designed and implemented in this paper. The algorithm is tested for a typical scenario in simulation, the results show that MM/MHT algorithm is effective and feasible to use in real tracking systems.

关键词： Target tracking Radar tracking Computational modeling Covariance matrices Algorithm design and analysis state estimation Filtering

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Improved Real-time Pedestrian Detection Method

Improved Real-time Pedestrian Detection Method

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International Conference on Computer Science and Network technology (ICCSNT)

作者： Zhiming Zhao Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781728133003

With the development of deep learning, algorithm research in object detection has also made significant progress. At present, there are many excellent object detectors, such as Faster R-CNN, SSD, etc. YOLO is one of the most outstanding detectors and has many practical applications in industry. Based on this, we study how to apply it to real-time pedestrian detection, and improve the detection performance. Based on the YOLO algorithm, we mainly carry out the following work: 1). Apply parameterized ReLU as main activation function of network; The classification subnet is separated from the regression subnet, and the parameters are no longer shared between the two subnetworks to improve the network performance; 2). Design loss function to reduce the effect of foreground-background class imbalance caused by anchors, and the classification is improved by hard sample mining. The weight coefficient is designed to improve the localization of the network for small objects. 3). Design the parameters of the anchors to optimize the localization of pedestrian objects.

关键词： Feature extraction Classification algorithms Real-time systems Prediction algorithms Convolution Object detection Detectors

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Design and implementation of target tracking software Development Environment

Design and implementation of target tracking software Develo...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Weihua Liu Yongjia Zhao Xiaoyong Lei State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376839

Target tracking software that running on airborne radar is usually developed by hard coding in C language. This method is not efficient, large amount of time and money is spent during the development process. In this paper, we present an integrated development environment for target tracking software, which is Target tracking software Development Environment (TDE). TDE supports the whole process of target tracking software development including design, implementation, testing and assessment. It provides most of the algorithms and function blocks widely used in target tracking software, and enables developers to construct the software in a short time, and then test and verify it in simulation. The example shows that TDE is effective and highly improved the development efficiency.

关键词： Target tracking Radar tracking Software Software algorithms Algorithm design and analysis Object oriented modeling

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Rendering and Modeling of Stratus Cloud Using Weather Forecast Data

Rendering and Modeling of Stratus Cloud Using Weather Foreca...

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International Conference on virtual reality and Visualization (ICVRV)

作者： Xiangxin Xu Chunqiang Yuan Xiaohui Liang Xukun Shen State Key Lab. of Virtual Reality Technol. & Syst. Beihang University Beijing CN State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781467376747

This paper presents a method for physically plausible modeling and real-time rendering of large scale cloud scene from weather forecast data which includes stratus clouds and cumulus clouds. Our method uses particles as primitives, but differs from existing methods, the particles are generated from the data using a new optical model, and then are splatted onto multi-resolution axis-aligned slices for rendering at interactive frame rates. In the cloud optics model, multiple light sources are used and multiple anisotropic Mie scattering and Rayleigh scattering are employed according to the particle optical depth. After particles are generated from weather forecast data, multi-resolution axis-aligned slices are generated. The rendering process can use these slices and be easily implemented on graphics hardware. The experiment results show that realistic cloud can be modeled and rendered at interactive frame rates.

关键词： Clouds Rendering (computer graphics) Data models Meteorology Predictive models Sun Cloud computing

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An adaptive physically-based deformation on distance fields

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Journal of Information and Computational Science 2009年第6期6卷 2263-2270页

作者： Wu, Xiaoxiao Liang, Xiaohui Xu, Qidi State Key Lab. of Virtual Reality Technology School of Computer Science Beihang University Beijing 100191 China

This paper presents a novel adaptive deformation algorithm by integrating the representations of ADFs and physically based deformable models. The octree-based adaptively sampled distance fields (ADFs) are employed as the shape representation. The deformation of the ADFs is governed by the principle of physical dynamics and achieved by manipulating the scalar fields directly. A dynamic adaptive resampling scheme for ADFs is used during deformations. The physically based model of mass-spring is integrated into irregular fields for deformation. The stiffness of the non-uniform springs in the system is adaptive to spatial resolution of ADFs to avoid non-homogeneity in physics caused by the irregular structure. The results show that our physically based deformation algorithm based on the representation of ADFs outperforms regular sampled distance field based deformation algorithm in terms of time and memory efficiency, and has potential applications in physically-based interactive sculpting. © 2009 Binary Information Press.

关键词： Deformation

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An approach for compression and synthesis of BTF

An approach for compression and synthesis of BTF

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2008 Chinese Conference on Pattern Recognition, CCPR 2008

作者： Zhang, Zhan Qi, Yue Hu, Yong State Key Lab. of Virtual Reality Technology Beihang University Beijing 100083 China

ISBN: (纸本)9781424423163

This paper presents an approach for compression and synthesis of BTF (Bidirectional Texture Function), and using it BTF can be mapped on arbitrary surfaces. BTF is a kind of multidimensional texture data, which can perfectly shows the self-shadow, self-occlusion and inter-reflection reflectance of object surfaces under varying light directions. However, it is difficult to use BTF on object surfaces because of its enormous data and small size. Our method uses PCA algorithm to compress enormous BTF data, and we propose a synthesis algorithm to solve its size problem and insure multidimensional consistency, while we also propose an algorithm of error calculation for Wang tiles' construction. Using the method we proposed this paper we can rendering BTF on arbitrary object surfaces efficiently and quickly. ©2008 IEEE.

关键词： Graphics processing unit

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