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作者： Chen, Zhigao Li, Wei Li, Xiaoyan Li, Tianran Akram, Naveed State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineer Beihang University Beijing China

ISBN: (纸本)9788988678312

Accurate presentation of high resolution images on wide varieties of multimedia devices, especially on pervasive mobile multimedia devices, faces great challenge. In this paper, we present an angle preserved warping method for image retargeting which allows resizing images to arbitrary aspect ratios while minimizing the loss of important information. To accomplish this, we first cover the original image with a Delaunay triangle mesh based on saliency map of the image, which is computed by considering the lumination, color, gradient and position features of the pixels comprehensively;and then the triangle mesh is deformed to target aspect ratios subject to a deformation loss function, to drive the visual prominent features to undergo similarity transformations. The deformation loss function is constrained by the angle's changes of the triangles in the triangle mesh. Compared with previous approaches using grid mesh, our method can transfer the distortion caused by the change of the image aspect ratios to less saliency regions much more effectively.

关键词： Aspect ratio

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A hybrid deformation model for virtual cutting

A hybrid deformation model for virtual cutting

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IEEE Internaitonal Conference on Multimedia Information Processing and Retrieval

作者： Shao, Xuqiang Zhou, Zhong Wu, Wei State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769542171

In this paper, we present a novel hybrid deformation model, which can simulate large deformations and non-linear behaviors of soft tissues in real time. The model partitions a soft tissue into operational and non-operational regions, and simulates the large deformations by coupling the geometry constrained meshless method FLSM (fast lattice shape matching) with finite element algorithm TLED (total Lagrangian explicit dynamics). With the virtual node cutting method, the soft tissues can be cut realistically and robustly. The virtual cutting simulation features real time performance with the GPU-based acceleration. In combination with our multi-camera based real-time modeling framework, the deformable model and its interaction of virtual cutting can be extended to support remote virtual surgery. © 2010 IEEE.

关键词： Finite element method

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Hao, Senshen Jiao, Jian Xia, Chunhe Li, Xiaojian Yao, Shan State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China Beijing Key Laboratory of Network Technology School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781424480340

In order to effectively deal with large-scale attacks on computer networks, computer Network Defense (CND) policy refinement based on descriptive language is wildly used. However, it's very difficult to figure out the semantic discrepancies between the measures and the predefined policy after the calculation with symbols by computers. A new method is presented to solve the discordance of semantic between the measures and the predefined policy automatically. Based on the establishment of the ontology of CND policy and measure (CNDPM), the CND policy and measure semantic similarity analysis model (CNDPMSSAM) is established, and then the termination of the two main components of CNDPMSSAM are proofed by the putdown automaton, and the prototype system of CNDPMSSAM is implemented. At last, we validate the validity of this method on analyzing semantic similarity of transferring from computer Network Defense Policy Specification Language (CNDPSL) to Defense Measure Description Language (DMDL) with experiments. © 2010 IEEE.

关键词： Ontology

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Static object tracking in road panoramic videos

Static object tracking in road panoramic videos

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IEEE Internaitonal Conference on Multimedia Information Processing and Retrieval

作者： Zhou, Zhong Niu, Ben Ke, Chen Wu, Wei State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769542171

In panoramic videos, the object movement between adjacent side images leads to deformation and discontinuity, which makes the traditional video tracking approaches insufficient. An effective static object tracking algorithm is proposed in this paper to resolve the tracking problems from the deformation and discontinuity in cubic panorama. The algorithm extends the relevant side images with boundary consistency, and then conducts a background eliminated mean-shift algorithm to track objects on the extended images. Experiment results show that the algorithm can track static objects correctly in reasonable situations in real-time. © 2010 IEEE.

关键词： Deformation

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Descriptive model of peer-to-peer botnet structures

Descriptive model of peer-to-peer botnet structures

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2010 International Conference on Educational and Information technology, ICEIT 2010

作者： Duan, Junfeng Jiao, Jian Xia, Chunhe Yao, Shan Li, Xiaojian State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China Beijing Key Laboratory of Network Technology School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781424480340

Peer-to-peer (P2P) Botnets, which are more resilient and robust than centralized botnets, have emerged as the peer-to-peer technology evolves. Better understanding of this new phenomenon will help researchers develop detection and mitigation methods. Most of existing work is case study of typical P2P botnets. In this paper, we focus on systematically analyzing structures of P2P botnets. We propose a descriptive model of P2P botnet structures, which consists of features of P2P bot, definitions of structures, and structural properties. Firstly, we detail two key functionalities of P2P bot, command-and-control (C&C) functionality and peer-to-peer (P2P) functionality, and give several features of P2P bot. And then, we define two structures of P2P botnets: C&C structure and P2P structure. To characterize these structures, we propose several properties and corresponding quantitative methods. Finally, we conduct experiments to verify our results. © 2010 IEEE.

关键词： Structural properties

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GPU-based time parallel cache simulator

GPU-based time parallel cache simulator

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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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