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2010 IEEE Youth Conference on Information, Computing and Telecommunications, YC-ICT 2010

作者： Ma, Junjie Wan, Han Gao, Xiaopeng Long, Xiang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Xueyuan Rd. 37 100191 Beijing China

ISBN: (纸本)9781424488841

We present the design of time parallel trace-driven cache simulation for the purpose of evaluating different cache architectures. Due to the long simulation cycles, traditional sequential simulation methods are no longer practical. An obvious way to achieve fast parallel simulation is time parallel. It splits the whole trace into small slices which are assigned to parallel processors for concurrent simulation. In this paper, we introduce a novel time parallel multi-configuration simulation on single pass method. It exploits time partitioning as the main sources of parallelism and takes the full advantage of the computational capability offered by the Compute Unified Device Architecture (CUDA) on the GPU. Our experimental results demonstrate that the cache simulator based on GPU platform gains 1.91x performance improvement compared to traditional serial algorithm. © 2010 IEEE.

关键词： Graphics processing unit

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A optimized model of polyhedral visual hull based on feature points matching

A optimized model of polyhedral visual hull based on feature...

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2010 International Conference on Intelligent Computing and Cognitive Informatics, ICICCI 2010

作者： Chen, GuojunP Jie, Jiang Su, Huanhuan College of Computer and Communication Engineering China University of Petroleum Dongying China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9780769540146

The 3D reconstruction based on the video image in real-time is an important problem, such as computer vision, computer graphics. The accuracy of the model is even the center issue of these fields. After considering the polyhedral visual hull (PVH) reconstruction method, this paper introduces a model optimized method based on the image feature points matching. In this paper, we present an algorithm that extracts the feature points from the public visible field of neighbor images, and finds the matched feature points by utilizing the epipolar relationships and the photo-consistency, and optimizes the original model by utilizing the matched feature points achieved and the original space location. The experimental results show that this method optimizes the original model efficiently and make the optimized model more accurate. © 2010 IEEE.

关键词： Three dimensional computer graphics

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Research of inter-domain data filtering method for distributed interactive simulation

Research of inter-domain data filtering method for distribut...

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International Conference on Audio, Language and Image Processing

作者： Liu, Li Chen, Hongqian Tan, Li School of Computer Science and Information Engineering Beijing Technology and Business University Beijing 100048 China State Key Laboratory of Virtual Reality Technology Beihang University Beijing 100083 China

ISBN: (纸本)9781424458653

The distributed interactive simulation of multi-domain is an important research area of the distributed virtual reality. However, frequent interaction, great quantity of messages and the discrepant need of each individual simulation domain resulted in numerous redundant messages. Filtering out the redundant data and relieving the transfer loads become a pressing necessity. We analysis the principle of data filtering of HLA standard and introduce a data filtering algorithm based on publish/subscribe. Utilized the data locality feature of distributed interaction simulation, this algorithm can be used in multi-domain either. The experiment shows that the method we introduced provides reliable data filtering performance with incurred incremental costs on purchasing information endurable by our system. In addition, the data filtering matching efficiency is well. ©2010 IEEE.

关键词： Information filtering

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Light space parallel-split shadow maps based on programmable GPUs

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2010年第3期22卷 388-395页

作者： Ma, Shang Liang, Xiaohui Yu, Zhuo Ren, Wei State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100191 China

Parallel-split shadow maps (PSSM) suffers from redundant rendering that unnecessarily renders same objects to multiple shadow map textures, when the light's direction and the camera's view direction are not perpendicular. To solve this problem, this paper presents a light space parallel-split shadow maps algorithm (LiSPSSM). The algorithm first divides the scene into certain layers that do not intersect each other by light's frustums in light space, and generates one shadow map for each layer to ensure that any shadow map does not have the same sample points. Then a faster synthesizing scene shadow method, which avoids operations of pixel layer determination, is given to improve GPU's efficiency. The results show that LiSPSSM effectively addresses the redundant rendering problem in PSSM and improves the efficiency and quality of real-time shadow rendering.

关键词： Graphics processing unit

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A real-time rendering method for large terrain including details in different resolutions

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Jisuanji Yanjiu yu Fazhan/computer Research and Development 2010年第6期47卷 988-995页

作者： Yu, Zhuo Liang, Xiaohui Ma, Shang Zhao, Qinping State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China

In order to improve the capacity of performance of large scale terrain data, users usually create detail data by editing way such as changing the features in some regions and add other details to original terrain data in some simulation training or video games. However, it's a big challenge to merge and render large terrain and additional detail data in real time due to different resolutions. In this paper, a new algorithm is given to handle this problem. In preprocessing stage, the algorithm constructs large terrain by clipmap structure as to integrating advantages of geometry clipmap method and constructs the detail data in mipmap way. In real-time rendering phase, the phenomenon of "F" hole area appears at the boundary between the large terrain and the detail data when clipmap structure is being updated. In order to solve this problem, a new structure called transition strip is proposed which can merge the data in different resolutions well in run time, the transition strip structure is given which is composed of two sides, the vertexes in lower resolution and vertexes in higher resolution. Some transition strips are used to fill the "F" hole area and these transition strips are close to each other in practice. And a fast triangulation method used for rendering. The results of experiments show that the transition strip can solve the problem of "F" hole area and can render both large terrain and details data in real time.

关键词： Landforms

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ACRP: Ant-colony-based routing protocol for DTMNs

ACRP: Ant-colony-based routing protocol for DTMNs

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Zhang, Pengxiu Wang, Haiquan Xia, Chunhe Lv, Liangshuang Liu, Xiaodong State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Beijing Key Laboratory of Network Technology Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China School of Software Beihang University Beijing China

ISBN: (纸本)9781424480340

Delay Tolerant Mobile Networks (DTMNs) focus on scenarios where most of the time contemporaneous end-to-end paths between source and destination do not exist, and mobility should be explored for message delivery. Ant colony optimization is based on reinforcement learning and is adaptive. In this paper, we propose ACRP: an Ant-Colony-based Routing Protocol for DTMNs. In the protocol, the forward ants and backward ants establish the pheromone trail;the data ants make forwarding decision according to the probability function composing both the pheromone and the heuristic information. We present simulation results measuring the performance of ACRP and compare it with other well-known routing protocols. © 2010 IEEE.

关键词： Routing protocols

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TLDV: Tree-Like Locator Distance Vector routing protocol for MANETs

TLDV: Tree-Like Locator Distance Vector routing protocol for...

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Wang, Haiquan Mi, Le Xia, Chunhe Lv, Liangshuang Chen, Meng State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Beijing Key Laboratory of Network Technology Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China School of Software Beihang University Beijing China

ISBN: (纸本)9781424480340

Most routing protocols in MANETs don't scale well in networks with large numbers of nodes where the scalability of the routing protocols plays a vital role. And it is well known that these routing protocols usually use node locator (e.g. IP address) as pure identifier. In this paper, we propose a scalable Tree-Like Locator Distance Vector routing protocol for MANETs, which is inspired by DART. This protocol splits node's ID and locator in network layer. Each node has one unique permanent ID and a temporary dynamic 2b-ary tree locator. Node's locator describes the node's relative position in the network's topology, and should change whenever the topology changes. © 2010 IEEE.

关键词： Routing protocols

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Complete 3D model reconstruction using a depth sensor

Complete 3D model reconstruction using a depth sensor

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2010 IEEE International Conference on Intelligent Computing and Integrated Systems, ICISS2010

作者： Mu, Guangyu Liao, Miao Yang, Ruigang Ouyang, Dantong Xu, Zhiwen Guo, Xiaoxin Department of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering of MOE Changchun China Department of Engineering University of Kentucky Center for Visualization and Virtual Environment Lexington United States

ISBN: (纸本)9781424468355

We propose a fast and simple application system of 3D model reconstruction. We acquire range images by using a combination of a regular camera and a depth sensor. The reconstruction of a 3D model consists of four key steps: (i) Initial alignment either feature tracking or the 4-points congruent sets algorithm is used to align surfaces captured at different frames. (ii)The iterative closest point (ICP) method is applied to further align the piecewise surfaces from the last step. (iii) The surfaces are merged into a whole 3D model by the volumetric method. (iv) In the refinement step, we fill holes and produce a complete 3D model that approximates the original model with robust repair of polygonal models. At last, we present the experimental results which show that the errors between our reconstructed model and the ground truth are less than 1 %. © 2010 IEEE.

关键词： Three dimensional computer graphics

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A real-time simulation method for large-scale 3D clouds

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2010年第4期22卷 662-669页

作者： Ren, Wei Liang, Xiaohui Ma, Shang Shen, Xukun State Key Laboratory of Virtual Reality Technology and Systems Beijing 100191 China School of Computer Science and Engineering Beihang University Beijing 100191 China

According to the problem of time consuming on large-scale 3D clouds rendering in virtual environment, this paper presents a real-time simulation method for large-scale 3D clouds. In modeling process, the Navier-Stokes equations are adopted for cloud modeling, and a method based on octree is presented to reduce the particle number of the cloud model. In rendering process, impostor technique is used and a schedule algorithm based on Cell is proposed to render the mixed 3D clouds and impostor automatically. As the clouds are simulated by physical model and updated in real time when the view moves, the rendering effect is highly realistic. Compared with other works, our algorithm based on Cell schedule shows better efficiency on computation, and substantially improves the jerky phenomenon effectively.

关键词： virtual reality

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Motion Choreographing Based on Kinetic Energy with Accelerometer Signal

Motion Choreographing Based on Kinetic Energy with Accelerom...

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International Conference on Multimedia technology

作者： Yubo Liu Xiaohui Liang Zhiying He State Key Laboratory of Virtual Reality Technology School of Computer Science Beihang University Beijing China

ISBN: (纸本)9781424478712

Motion choreographing is extremely important nowadays. To provide an intuitive control interface and improve the end-user's experience, low-cost accelerometer, which serving as creating and choreographing character animation based on the performers' movements, attracts more and more researchers. This paper proposes a new feature vector using kinetic energy, which can be calculated from acceleration directly. Our method gives the feature vector more accurate physical significance and improves the recognition rate. Furthermore, post-processing for signal refinement can also benefit from it. We build a prototype of motion recognition system to verify our method. Experiments show that the proposed method leads to a higher recognition rate comparing to typical methods on a database of 48 pre-trained signal data with 8 different categories.

关键词： Kinetic energy Hidden Markov models Accelerometers Acceleration Timing Animation Prototypes

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