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A 3D Topology model for Multiple Topological Representations based on Combinatorial Maps

A 3D Topology model for Multiple Topological Representations...

The 18th International Conference on Geoinformatics(第18届国际地理信息科学与技术大会 Geoinformatics 2010)

作者： Mingguang WU Yongning WEN TaiSheng CHEN Jingwei SHEN Bai Guimei Key Laboratory of Virtual Geographic Environment (Ministry of Education) Nanjing Normal UniversityN Dept.of Computer Science and Information Engineering Luoyang Institute of Science and Technology Luo

ISBN: (纸本)9781424473014

The formal representation of topological relations plays a very important role in process of spatial query, spatial analysis and spatial reasoning. Most current models support a single representation of geometry and topology at a fixed resolution. While it often happens that different applications take into consideration spatial data/topological relationship, with the same 3D scene date, under different viewpoints, in different geometric forms and/or with different resolutions. In this case, a topology model for multiple topological representations is needed. In this paper, we propose a new approach based on combinatorial maps, which focus on both multiple topological representations under the situation of LOD and Feature semantic/spatial aggregation and the consistency of topology.

关键词： Topology Data model:Multiple topological representation:3D Combinatorial Maps

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Complete 3D Model Reconstruction Using Two Types of Depth Sensors

Complete 3D Model Reconstruction Using Two Types of Depth Se...

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2010 IEEE International Conference on Intelligent Computing and Intelligent Systems(2010 IEEE 智能计算与智能系统国际会议 ICIS 2010)

作者： Guangyu Mu Miao Liao Ruigang Yang Dantong Ouyang Zhiwen Xu Xiaoxin Guo Department of Computer Science and Technology Jilin UniversityCollege of InformationJilin Univers Department of Engineering University of KentuckyCenter for Visualization and Virtual EnvironmentLe Department of Engineering University of KentuckyCenter for Visualization and Virtual EnvironmentLe Department of Computer Science and Technology Jilin UniversityKey Laboratory of Symbolic Computatio Department of Computer Science and Technology Jilin UniversityChangchun China

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 two types of depth sensors. 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％.

关键词： 3D model reconstruction range image integration

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To determine neighborhoods in ultrasound image denoising

To determine neighborhoods in ultrasound image denoising

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International Conference on Machine Learning and Cybernetics

作者： Liao, Zhiwu Hu, Shaoxiang Wang, Jianjun Yu, Zhiqiang Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Sichuan Normal University Chengdu China School of Computer Science Sichuan Normal University Chengdu China School of Automation Engineering University of Electronic Science and Technology of China Chengdu China Chinese Flight Test Establishment Xi'an China Chengdu Aircraft Industrial Co. Ltd. Chengdu China

ISBN: (纸本)9781424465262

Ultrasound images are effected by serious noises. In this paper, we propose an adaptive method by determining a variable neighborhood of each pixel in ultrasound image denoising. The real neighbors of a pixel can be chosen according to the local energy of the pixel, the distance between the pixel and its close pixels, the requirement of reliable estimate. All of the real neighbors of a pixel form a neighborhood, named the real neighborhood (RN) of the pixel. The RN s can preserve edges and obtain reliable estimates simultaneously, which can not be met at the same time and becomes a tradeoff problem in existing methods. The experiments also show better performance both in denoising and edges preserving than the state-of-art techniques. © 2010 IEEE.

关键词： Pixels

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Complete 3D model reconstruction using a depth sensor

Complete 3D model reconstruction using a depth sensor

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International Conference on Intelligent Computing and Integrated Systems (ICISS)

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

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%.

关键词： Biomedical imaging Uncertainty

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An Optimized Model of Polyhedral Visual Hull Based on Feature Points Matching

An Optimized Model of Polyhedral Visual Hull Based on Featur...

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International Conference on Intelligent Computing and Cognitive Informatics (ICICCI)

作者： Guojun Chen Jie Jiang Huanhuan Su State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China College of Computer and Communication Engineering China University of Petroleum Dongying China China University of Petroleum Beijing Changping-qu Beijing CN

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.

关键词： Visualization Solid modeling Cameras Pixel Three dimensional displays Image reconstruction Geometry

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A point-based rendering approach for real-time interaction on mobile devices

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Science in China(Series F) 2009年第8期52卷 1335-1345页

作者： LIANG XiaoHui ZHAO QinPing HE ZhiYing XIE Ke LIU YuBo State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Technology Beihang UniversityBeijing 100191 China

Mobile device is an important interactive platform. Due to the limitation of computation, memory, display area and energy, how to realize the efficient and real-time interaction of 3D models based on mobile devices is an important research topic. Considering features of mobile devices, this paper adopts remote rendering mode and point models, and then, proposes a transmission and rendering approach that could interact in real time. First, improved simplification algorithm based on MLS and display resolution of mobile devices is proposed. Then, a hierarchy selection of point models and a QoS transmission control strategy are given based on interest area of operator, interest degree of object in the virtual environment and rendering error. They can save the energy consumption. Finally, the rendering and interaction of point models are completed on mobile devices. The experiments show that our method is efficient.

关键词： virtual environment mobile devices point models simplification QoS control area of interest interest degree

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Simulation platform for computing visual hull of 3D objects

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Journal of Information and Computational Science 2009年第5期6卷 2169-2176页

作者： Chen, Guojun Su, Huanhuan Jiang, Jie Wu, Wei College of Computer and Communication Engineering China University of Petroleum Dongying 257061 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China

The visual hull is widely used as a proxy for real-time reconstructing a three-dimensional model from object silhouettes in images. We present a simulation platform for creating and rendering visual hulls(VHSP). This platform has a number of advantages: 1) it is multi camera based OpenGL and implemented purely based on software, 2) it is well-suited to calculating visual hull with various algorithms, and 3) it can be used to compare various algorithms. This platform sets up a uniform coordinate system for multi camera and projection matrix according to OpenGL graphics processing pipeline. On this platform, we develop dynamically computing polyhedral representation of visual hull, and present and develop a method of computing a safe polyhedral visual hull (SPVH) without phantom volumes. Results demonstrate the effectiveness of this platform for researching and developing method of computing visual hull. © 2009 Binary Information Press.

关键词： Surface reconstruction

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A MAC protocol for congested cognitive radio network

A MAC protocol for congested cognitive radio network

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2nd International Conference on Intelligent Networks and Intelligent Systems, ICINIS 2009

作者： Yue, Song-Song Wu, Wei State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science Beihang University Beijing China

ISBN: (纸本)9780769538525

This paper proposed a media access control (MAC) protocol for distributed cognitive radio network, which can work effectively in congested network by dynamic spectrum allocation. Cognitive nodes user chose the communication channel by negotiation, considering the channel usage of neighbours. The scheme can reduce the interference between nodes by selecting proper channel, improve the throughput of network significantly, especially when the network is highly congested. The simulation results show that our protocol outperforms the random allocation protocol by 48.2% in throughput. © 2009 IEEE.

关键词： Cognitive radio

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Automatic image inpainting by heuristic texture and structure completion

Automatic image inpainting by heuristic texture and structur...

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16th International Multimedia Modeling Conference on Advances in Multimedia Modeling, MMM 2010

作者： Chen, Xiaowu Xu, Fang State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)3642113001

This paper studies an image inpainting solution based on a primal sketch representation model [1], which divides an image into structure (sketchable) and texture (non-sketchable) components. This solution first predicts the missing structures, such as curves and corners, using a tensor voting algorithm [2]. Then the texture parts along structural sketches are synthesized with the patches sampled from the known regions, and the remaining texture parts are defused using a graph cuts algorithm [3]. Compared to the state-of-art image inpainting approaches, the characteristics of this solution include: 1) using the primal sketch representation model to guide completion for visual consistency;2) achieving fully automatic completion. Finally, the experiments on the public datasets show above characteristics. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Graphic methods

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Accelerate cache simulation with generic GPU

Accelerate cache simulation with generic GPU

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IEEE 9th International Conference on computer and Information technology, CIT 2009

作者： Han, Wan Xiaopeng, Gao Zhiqiang, Wang State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769538365

Trace-driven cache simulation is the most widely used method to evaluate different cache structures. Several techniques have been proposed to reduce the simulation time of sequential trace-driven simulation. An obvious way to achieve fast parallel simulation is to simulate the individual independent sets of a cache concurrently on different compute resources. We propose improvements to current trace-driven simulation methods to make them faster and more economical. This paper considers the use of generic GPU to accelerate cache simulation which exploits set-partitioning as the main source of parallelism. We develop more efficient parallel simulation techniques by introducing more knowledge into the Compute Unified Device Architecture (CUDA) on the GPU. Our experimental result shows that the new algorithm can produce performance results for a number of set-associative caches in just a single simulation run and still produce the exact results. © 2009 IEEE.

关键词： Graphics processing unit

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