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14th Eurographics Symposium on Virtual Environments, EGVE 2008

作者： Smelik, R.M. Tutenel, T. de Kraker, K.J. Bidarra, R. Modelling and Simulation Department TNO Defence Security and Safety Netherlands Computer Graphics and CAD/CAM Group Delft University of Technology Netherlands

ISBN: (纸本)9783905673661

Manual game content creation is an increasingly laborious task;with each advance in graphics hardware, a higher level of fidelity and detail is achievable and, therefore, expected. Although numerous automatic (e.g. procedural) content generation algorithms and techniques have been developed over the years, their application in both games and simulations is not widespread. What lacks is a unifying modeling framework that combines these techniques in a usable manner. We propose to develop a new, high-level framework for automatic generation of virtual worlds (e.g. game levels, simulation terrain) that requires intuitive user input and results in a rich 3D terrain model. © The Eurographics Association 2008.

关键词： Landforms

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Enhancing visualization skills-improving options aNd success (EnViSIONS) of engineering and technology students

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Engineering Design graphics Journal 2009年第2期73卷 1-17页

作者： Veurink, N.L. Hamlin, A.J. Kampe, J.C.M. Sorby, S.A. Blasko, D.G. Holliday-Darr, K.A. Trich Kremer, J.D. Abe Harris, L.V. Connolly, P.E. Sadowski, M.A. Harris, K.S. Brus, C.P. Boyle, L.N. Study, N.E. Knott, T.W. Department of Engineering Fundamentals Michigan Technological University Houghton MI 49931 United States Department of Mechanical Engineering Michigan Technological University Houghton MI 49931 United States Department of Psychology Penn. State Erie Behrend College Erie PA 16563 United States Department of Mechanical Engineering Technology Penn. State Erie Behrend College Erie PA 16563 United States Department of Computer Graphics Technology Purdue University West Lafayette IN 47907 United States Technology and Engineering Education Indiana State University Terre Haute IN 47809 United States Women in Science and Engineering University of Iowa Iowa City IA 52242-1320 United States Department of Industrial Engineering University of Iowa Iowa City IA 52242 United States Department of Engineering and Technology Virginia State University Petersburg VA 23806 United States Department of Engineering Education Virginia Tech. Blacksburg VA 24073 United States

Spatial visualization skills are vital to many careers and in particular to STEM fields. Materials have been developed at Michigan Technological University and Penn State Erie, The Behrend College to assess and develop spatial skills. The EnViSIONS (Enhancing Visualization Skills-Improving Options aNd Success) project is combining these materials and testing them with pre-college and college students at seven institutions: Michigan Tech, Penn State Behrend, Purdue University, University of Iowa, Virginia State University, Virginia Tech, and a "Project Lead the Way" course in south-central Arizona. By removing a barrier to success for students with low visualization skills, particularly women, the project leaders hope to improve the retention of these students in STEM disciplines and to enhance their success. This paper will give a brief overview of the implementations at the university level and the fndings.

关键词： Students

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Training sequential on-line boosting classifier for visual tracking

Training sequential on-line boosting classifier for visual t...

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作者： Grabner, Helmut Šochman, Jan Bischof, Horst Matas, Jiří Institute for Computer Graphics and Vision Graz University of Technology Austria Center for Machine Perception Czech Technical University Prague Czech Republic Computer Vision Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781424421756

On-line boosting allows to adapt a trained classifier to changing environmental conditions or to use sequentially available training data. Yet, two important problems in the on-line boosting training remain unsolved: (i) classifier evaluation speed optimization and, (ii) automatic classifier complexity estimation. In this paper we show how the on-line boosting can be combined with Wald's sequential decision theory to solve both of the problems. The properties of the proposed on-lineWaldBoost algorithm are demonstrated on a visual tracking problem. The complexity of the classifier is changing dynamically depending on the difficulty of the problem. On average, a speedup of a factor of 5-10 is achieved compared to the non-sequential on-line boosting. © 2008 IEEE.

关键词： Decision theory

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Online instructor evaluations: A Web-based application

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Journal of Industrial technology 2008年第4期24卷

作者： Glotzbach, Ronald J. Burton, Terry L. Co, Betty Department of Computer Graphics Technology Purdue University's West Lafayette Campus Portugal Department of Computer Graphics Technology Purdue University United States Allscripts United States

Instructor evaluations are still paper-based throughout many universities;however, some universities are beginning to evaluate Web-based solutions to a time-consuming and wasteful process. Purdue OnLine Evaluations (POLE) is a Web-based system currently in place for students in the Department of computer graphics technology (CGT) at Purdue University to evaluate their instructors and courses. An upgrade to ***, which provided additional functionality related to charting and graphing, using C# and a Microsoft SQL Server database management system was completed along with Ajax user interface components that provided a more fluid and rich user interface. While the application was used on a relatively small scale, steps were taken to implement this Web-based solution as the evaluation software for Purdue University and possibly as the benchmark for other universities. The system has applications for not only Industrial technology, but any college or department interested in automating the instructor and course evaluation process. The findings showed that the majority of students tested, who agreed that completing an online evaluation was quick, also agreed that they would use POLE to evaluate their courses. Additionally, by providing faculty an easy way to create evaluation questions, they were also highly likely to use POLE for creating course evaluations. Finally, the findings of this study show that integration of an online evaluation system can provide accurate, timely, and more detailed information to instructors and departments, as well as, retain the confidentiality, security, and functionality of the traditional paper-based approach.

关键词： Students

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Variable Neighborhood Search for a prize collecting capacity constrained connected facility location problem

Variable Neighborhood Search for a prize collecting capacity...

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2008 International Symposium on Applications and the Internet, SAINT 2008

作者： Leitnef, Markus Raidl, Günther R. Carinthia University of Applied Sciences School of Telematics Network Engineering Klagenfurt Austria Vienna University of Technology Institute of Computer Graphics and Algorithms Vienna Austria

ISBN: (纸本)9780769532974

We present a Variable Neighborhood Search approach for a network design problem occurring in real world when the bandwidth of an existing network shall be enhanced. Using two different neighborhood structures we show that a carefully designed combination of a metaheuristic and an exact method based on integer linear programming is able to improve solution quality compared to using heuristic methods only. © 2008 IEEE.

关键词： Heuristic methods

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GPU-accelerated Adaptively Sampled Distance Fields

GPU-accelerated Adaptively Sampled Distance Fields

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International Conference on Shape Modeling and Applications

作者： Thiago Bastos Waldemar Celes Department of Computer Science Tecgraf Computer Graphics Technology Group Brazil

Adaptively Sampled Distance Fields (ADFs) are volumetric shape representations that support a broad range of applications in the areas of computer graphics, computer vision and physics. ADFs are especially beneficial for representing shapes with features at very diverse scales. In this paper, we propose a strategy to represent and reconstruct ADFs on modern graphics hardware (GPUs). We employ a 3D hashing scheme to store the underlying data structure and try to balance the tradeoff between memory requirements and reconstruction efficiency. To render ADFs on GPU, we use a general-purpose ray-casting technique based on sphere tracing, which guarantees the reconstruction of fine details. We also present a way to overcome the Cl discontinuities inherent to ADFs and efficiently reconstruct smooth surface normals across cell boundaries. The effectiveness of our proposal is demonstrated for isosurface rendering and morphing.

关键词： Shape computer graphics Application software computer vision Physics Hardware Data structures Rendering (computer graphics) Surface reconstruction Proposals

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Using localization information for attack detection in mobile ad hoc networks

Using localization information for attack detection in mobil...

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SICHERHEIT 2008 - Sicherheit, Schutz und Zuverlassigkeit, Konferenzband der 4. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft fur Informatik e.V. (GI) - 4th Annual Conference of the Department of Security of the Society for Informatics

作者： Ebinger, Peter Sommer, Martin Security Technology Dept. Fraunhofer Institute for Computer Graphics Research IGD Technische Universität Darmstadt Fraunhoferstr. 5 64283 Darmstadt Germany

ISBN: (纸本)9783885792222

This paper examines how positioning data, radio signal characteristics and routing information can be used to detect active attacks (such as black hole attacks) in mobile ad hoc networks (MANETs). Various data sets are analysed and compared to check their consistency in order to detect anomalies that might indicate attack. Direct positioning data (such as GPS coordinates) and other sources of information (such as radio signal strength) are taken into account from which conclusions can be drawn about the distance between individual nodes. Expected communication relationships derived from node localization are compared to the actual network connectivity graph given by the routing tables. This comparison can detect suspicious properties (divergent values) which could indicate an attack in progress. We propose methods for MANET intrusion detection which allow the detection of active attacks based on different sensor data related to node localization. The typical state of this sensor data during normal network operation is compared to measured results during an active attack. The underlying protocol of the analyzed MANET is Ad hoc On-demand Distance Vector Routing (AODV) and proposed concepts are verified using the network simulator JiST/MobNet. Simulation results show that the proposed IDS components detect can attacks on a MANET with high probability for various set-ups.

关键词： Mobile ad hoc networks

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Evaluating the Content-Related Quality of Digital ID Images

Evaluating the Content-Related Quality of Digital ID Images

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Congress on Image and Signal Processing, CISP

作者： Qi Han Yuridia Gonzalez Juan Manuel Guerrero Xia-mu Niu Harbin Institute of Technology Harbin China Fraunhofer Institute for Computer Graphics Germany Fraunhofer Institute for Computer Graphics Darmstadt Germany

Digital ID images are getting wide use in our social life. The automatic evaluation of the images’ quality is an important technique in the applications. An evaluation method on the content-related quality of ID images is introduced in this paper. The important attributes and their evaluating methods are analyzed in accordance with the ISO/IEC and ICAO standards. Considering the special features and restrictions of ID images, a simplified fast facial features extraction algorithm is proposed. The attributes related with the content of face image are then evaluated based on the information yielded from feature extraction results.

关键词： Face detection ISO standards IEC standards Feature extraction Facial features Eyes Automatic control Control systems Quality control Image quality

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Heuristic Cut Separation in a Branch&Cut Approach for the Bounded Diameter Minimum Spanning Tree Problem

Heuristic Cut Separation in a Branch&Cut Approach for the Bo...

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Symposium on Applications and the Internet (SAINT)

作者： Martin Gruber Günther R. Raidl Institute of Computer Graphics and Algorithms University of Technology Vienna Austria

The bounded diameter minimum spanning tree problem is an NP-hard combinatorial optimization problem arising for example in network design when quality of service is of concern. We solve a strong integer linear programming formulation based on so-called jump cuts by a novel branch&cut algorithm, using various heuristics including tabu search to solve the separation problem.

关键词： Algorithm design and analysis Heuristic algorithms Construction industry Silicon Runtime Optimization Upper bound

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Robust tracking of spatial related components

Robust tracking of spatial related components

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International Conference on Pattern Recognition

作者： Thomas Mauthner Michael Donoser Horst Bischof Institute for Computer Graphics and Vision Graz University of Technology Austria

This paper introduces a hierarchical approach for multi-component tracking, where the object-to-be-tracked is modeled as a group of spatial related parts. We propose to use a robust particle filtering framework for tracking the individual components and outline how the spatial coherency between the parts can be efficiently integrated by analyzing a two-level hierarchy of particle filters. Including spatial information allows to handle common tracking problems like occlusions, clutter or blur. Furthermore, the dynamic calculation of particle set uncertainties allows a dynamic adaption of stiffness values for the spatial model to e. g. force occluded parts to stay in spatial relation. The experimental section proves the robustness of the proposed tracker on challenging sequences of the VIVID-PETS database.

关键词： Robustness Particle filters Particle tracking Filtering State-space methods Spatial coherence Uncertainty Computational complexity computer graphics Spatial databases

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