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Symposium on computer Animation 2009 - ACM SIGGRAPH / Eurographics Symposium

作者： Ma, Xiaohan Le, Binh Huy Deng, Zhigang Computer Graphics and Interactive Media Lab Department of Computer Science University of Houston Houston TX United States

ISBN: (纸本)9781605586106

Most of current facial animation editing techniques are frame-based approaches (i.e., manually edit one keyframe every several frames), which is ineffective, time-consuming, and prone to editing inconsistency. In this paper, we present a novel facial editing style learning framework that is able to learn a constraint-based Gaussian Process model from a small number of facial-editing pairs, and then it can be effectively applied to automate the editing of the remaining facial animation frames or transfer editing styles between different animation sequences. Comparing with the state of the art, multiresolution-based mesh sequence editing technique, our approach is more flexible, powerful, and adaptive. Our approach can dramatically reduce the manual efforts required by most of current facial animation editing approaches. © 2009 ACM.

关键词： Animation

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A MACHINE LEARNING APPROACH FOR MECHANISM SELECTION IN COMPLEX NEGOTIATIONS

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Journal of Systems science and Systems Engineering 2018年第2期27卷 134-155页

作者： Reyhan Aydogan Ivan Marsa-Maestre Mark Klein Catholijn M. Jonker Department of Computer Science Ozyegin University Istanbul Turkey reyhan Interactive Intelligence Group Delft University of Technology The Netherlands Department of Computer Engineering University of Alcala 28805 Alcala de Henares Madrid Spain ivan Interactive Center for Collective Intelligence Massachusetts Institute of Technology Cambridge USA

Automated negotiation mechanisms can be helpful in contexts where users want to reach mutually satisfactory agreements about issues of shared interest, especially for complex problems with many interdependent issues. A variety of automated negotiation mechanisms have been proposed in the literature. The effectiveness of those mechanisms, however, may depend on the charaeteristics of the underlying negotiation problem （e.g. on the complexity of participant＇s utility functions, as well as the degree of conflict between participants）. While one mechanism may be a good choice for a negotiation problem, it may be a poor choice for another. In this paper, we pursue the problem of selecting the most effective negotiation mechanism given a particular problem by （1） defining a set of scenario metrics to capture the relevant features of negotiation problems, （2） evaluating the performance of a range of negotiation mechanisms on a diverse test suite of negotiation scenarios, （3） applying machine learning techniques to identify which mechanisms work best with which scenarios, and （4） demonstrating that using these classification rules for mechanism selection enables significantly better negotiation performance than any single mechanism alone.

关键词： Automated negotiation mechanism selection scenario metrics

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Raytracing point clouds using geometric algebra

Raytracing point clouds using geometric algebra

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1st International Workshop on computer graphics, computer Vision and Mathematics, GraVisMa 2009

作者： Deul, Crispin Burger, Michael Hildenbrand, Dietmar Koch, Andreas Interactive Graphics Systems Group Computer Science Department TU Darmstadt Germany Embedded Systems and Applications Computer Science Department TU Darmstadt Germany

ISBN: (纸本)9788086943909

Geometric Algebra (GA) supports the geometrically intuitive development of an algorithm with its build-in geometric primitives such as points, lines, spheres or planes. But on the negative side GA has a huge computational footprint. In this paper we study how GA can compete with traditional methods from Linear Algebra (LA) in the field of raytracing. We examine the raytracing algorithm for both GA and LA on the basis of primitive operations. Furthermore we introduce a novel framework for rendering point clouds based on spheres and planes as surface elements. We use this model to benchmark implementations of both algebras. Our results show that depending on the microprocessor architecture like CPUs, FPGAs or GPUs Geometric Algebra and Linear Algebra can raytrace with comparable speed.

关键词： Field programmable gate arrays (FPGA)

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Scene Synthesis with Automated Generation of Textual Descriptions

Scene Synthesis with Automated Generation of Textual Descrip...

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43rd Annual Conference on European Association for computer graphics, EUROgraphics 2022

作者： Müller-Huschke, J. Ritter, M. Harders, M. Interactive Graphics and Simulation Group The Department of Computer Science University of Innsbruck Austria

ISBN: (纸本)9783038681694

Most current research on automatically captioning and describing scenes with spatial content focuses on images. We outline that generating descriptive text for a synthesized 3D scene can be achieved via a suitable intermediate representation employed in the synthesis algorithm. As an example, we synthesize scenes of medieval village settings, and generate their descriptions. Our system employs graph grammars, Markov Chain Monte Carlo optimization, and a natural language generation pipeline. Randomly placed objects are evaluated and optimized by a cost function capturing neighborhood relations, path layouts, and collisions. Further, in a pilot study we assess the performance of our framework by comparing the generated descriptions to others provided by human subjects. While the latter were often short and low-effort, the highest-rated ones clearly outperform our generated ones. Nevertheless, the average of all collected human descriptions was indeed rated by the study participants as being less accurate than the automated ones. © 2022 The Author(s).

关键词： Cost functions

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computer artist's color naming system

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The Visual computer 1986年第4期2卷 255-260页

作者： Kaufman, Arie Center of Computer Graphics Department of Mathematics and Computer Science Ben-Gurion University of the Negev Beer-Sheva 84120 Israel

A natural language based color naming system for color raster graphics, the Artist's Color Naming System (ACNS), is introduced. ACNS is an English-based nomenclature which is a high-level alternative to the numeric HSV (Hue-Saturation-Value) single-hexcone color model. ACNS suggests a grammar, based upon psychological, linguistic and artistic considerations, for constructing several hundred color designations from a small number of English terms. The ACNS twenty-four sided pyramid model and its lexicon are based upon the CNS (Color Naming System) double pyramid model and lexicon. An algorithm and a reverse algorithm for the transformation of the ACNS color space into the RGB (Red-Green-Blue) colorcube, are presented. © 1986 Springer-Verlag.

关键词： Artist's color naming system Color model Color naming system Color nomenclature Color transform graphics languages

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Robust reconstruction of curved line structures in noisy point clouds

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Visual Informatics 2021年第3期5卷 1-14页

作者： Marcel Ritter Daniel Schiffner Matthias Harders Interactive Graphics and Simulation Group Department of Computer ScienceUniversity of InnsbruckAustria Airborne Hydromapping GmbH InnsbruckAustria DIPF|Leibniz Institute for Research and Information Education FrankfurtGermany

Point-based geometry representations have become widely used in numerous contexts,ranging from particle-based simulations,over stereo image matching,to depth sensing via light detection and *** application focus is on the reconstruction of curved line structures in noisy 3D point cloud *** algorithms operating on such point clouds often rely on the notion of a local *** the latter,our approach employs multi-scale neighborhoods,for which weighted covariance measures of local points are *** line structures are reconstructed via vector field tracing,using a bidirectional piecewise streamline *** also introduce an automatic selection of optimal starting points via multi-scale geometric *** pipeline development and choice of parameters was driven by an extensive,automated initial analysis process on over a million prototype test *** behavior of our approach is controlled by several parameters—the majority being set automatically,leaving only three to be controlled by a *** an extensive,automated final evaluation,we cover over one hundred thousand parameter sets,including 3D test geometries with varying curvature,sharp corners,intersections,data holes,and systematically applied varying types of ***,we analyzed different choices for the point of reference in the co-variance computation;using a weighted mean performed best in most *** addition,we compared our method to current,publicly available line reconstruction *** to thirty times faster execution times were achieved in some cases,at comparable error ***,we also demonstrate an exemplary application on four real-world 3D light detection and ranging datasets,extracting power line cables.

关键词： Computational geometry Noisy point clouds Line reconstruction Automatic Adaptive control

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Gaalop 2.0 - A geometric algebra algorithm compiler

Gaalop 2.0 - A geometric algebra algorithm compiler

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2nd International Workshop on computer graphics, computer Vision and Mathematics, GraVisMa 2010

作者： Schwinn, Christian Hildenbrand, Dietmar Stock, Florian Koch, Andreas TU Darmstadt Germany Department of Computer Science Germany TU Darmstadt Germany Department of Computer Science Interactive Graphics Systems Group Germany TU Darmstadt Germany Department of Computer Science Embedded Systems and Applications Group Germany

ISBN: (纸本)9788086943855

In recent years, Geometric Algebra (GA) has become more and more popular in fields of science and engineering due to its potential for compact algorithms. However, the execution of GA algorithms and the related need for high computational power is still the limiting factor for these algorithms to be used in practice. Therefore, it would be desirable to automatically detect parts that can be calculated in parallel by a software tool. In this paper, we present Gaalop 2.0, a Geometric Algebra Algorithm Compiler, which takes as input the description of a GA algorithm, symbolically optimizes the output multivectors and compiles the optimized code into a target language source file such as C++, for instance. For each output multivector the code for the different coefficients is generated, which is finally adjusted to contain only basic arithmetic operations instead. This allows the optimized output to be compiled for parallel computing platforms like FPGAs, for instance.

关键词： Field programmable gate arrays (FPGA)

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Maintaining integrity in complex shape definitions 15

Maintaining integrity in complex shape definitions

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15th Design Automation Conference, DAC 1978

作者： Baer, Adrian E. New Jersey Institute of Technology Department of Computer and Information Science Interactive Graphics Laboratory NewarkNJ07102 United States

A method is discussed for combining flexibility in defining 3-dimensional geometric shape with system maintained integrity. Such capabilities allow the user to concentrate on local considerations in modifying design databases in an interactive environment. © 2017 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： computer aided design

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Knowledge engineering in design

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Knowledge-Based Systems 1988年第2期1卷 67-77页

作者： Akman, Varol Hagen, Paul ten Rogier, Jan Veerkamp, Paul Department of Interactive Systems Center for Mathematics and Computer Science (CWI) 1098 SJ Amsterdam Kruislaan413 Netherlands

The authors present, in a unifying framework, the principles of the IIICAD system, a generic design apprentice currently under development at CWI. IIICAD incorporates three kinds of design knowledge. First, it has general knowledge about the stepwise nature of design based on a set-theoretic design theory. Second, it has domain-dependent knowledge belonging to the specific design areas where it may actually be used. Finally, it maintains knowledge about the previously designed objects;this is somewhat similar to software reuse. Furthermore, IIICAD uses AI techniques in the following areas: formalization of design processes, extensional versus intentional descriptions, modal and other non-standard logics as knowledge representation tools;commonsense reasoning about the physical world (naive physics), coupling symbolic and numerical computation;integration of object-oriented and logic programming paradigms, and development of a common base language for design. © 1988.

关键词： artificial intelligence computer-aided engineering and design deduction and theorem proving extensional/intensional descriptions knowledge representation formalisms and methods languages naive physics non-standard logics object-oriented programming

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THE VERSATILITY OF AUTOMATIC MESH GENERATORS BASED ON TREE-STRUCTURES AND ADVANCED GEOMETRIC CONSTRUCTS

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COMMUNICATIONS IN APPLIED NUMERICAL METHODS 1988年第3期4卷 379-392页

作者： SHEPHARD, MS BAEHMANN, PL GRICE, KR Center for Interactive Computer Graphics Rensselaer Polytechnic Institute Troy NY 12180-3590 U.S.A. Associate Professor Department of Mechanical and Civil Engineering. Research Engineer.

AbstractThe ability of the finite octree and finite quadtree automatic mesh generators to satisfy effectively a wide variety of meshing capabilities is demonstrated. Areas considered include the ability to integrate easily with geometric modelling systems, versatile interactive mesh control functions, the ability to reorder unknowns directly from the finite element data structure and the ability to support automated finite element modelling.

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