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9th International Conference on Discrete Geometry for computer Imagery, DGCI 2000

作者： Thürmer, Grit Pousset, Arnault Braquelaire, Achille J.-P. CoGVis/MMC - Computer Graphics Visualization Man-Machine Communication Group Faculty of Media Bauhaus-University Weimar 99421 Weimar Germany LaBRI - Laboratoire Bordelais de Recherche en Informatique UMR 5800 University Bordeaux 1 351 cours de la Libération 33405 Talence France

ISBN: (纸本)3540413960

A method is proposed which computes the visible points of surfaces in a 3-dimensional discrete space. The occlusion of surface points of an object by other object points is determined by shooting a discrete ray from each surface point towards the center of projection considering the intersection of the ray with other object points. Since the projection of points onto the viewing plane is done by a continuous mapping, additionally to the discrete ray, the location of the continuous projection ray is examined regarding its location to the surface points that are intersected by the discrete ray. © Springer-Verlag Berlin Heidelberg 2000.

关键词： computers

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Automating interface evaluation 94

Automating interface evaluation

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Conference Companion on Human Factors in Computing Systems

作者： Michael D. Byrne D. Wood Piyawadee Sukaviriya James D. Foley David Kieras Graphics Visualization and Usabitity Center Georgia Institute of Technology Atlanta GA Electrical Engineering and Computer Science Department University of Michigan Ann Arbor MI

No abstract available.

ISBN: (纸本)9780897916516

No abstract available.

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Weaving patterns inspired by the pentagon snub subdivision scheme

arXiv

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arXiv 2021年

作者： Lipschütz, Henriette Reitebuch, Ulrich Skrodzki, Martin Polthier, Konrad Fachbereich Mathematik und Informatik Institut für Mathematik Freie Universität Berlin Germany Computer Graphics and Visualization TU Delft Netherlands

Various computer simulations regarding, e.g., the weather or structural mechanics, solve complex problems on a two-dimensional domain. They mostly do so by splitting the input domain into a finite set of smaller and simpler elements on which the simulation can be run fast and efficiently. This process of splitting can be automatized by using subdivision schemes. Given the wide range of simulation problems to be tackled, an equally wide range of subdivision schemes is available. They create subdivisions that are (mainly) comprised of triangles, quadrilaterals, or hexagons. Furthermore, they ensure that (almost) all vertices have the same number of neighboring vertices. This paper illustrates a subdivision scheme that splits the input domain into pentagons. Repeated application of the scheme gives rise to fractal-like structures. Furthermore, the resulting subdivided domain admits to certain weaving patterns. These patterns are subsequently generalized to several other subdivision schemes. As a final contribution, we provide paper models illustrating the weaving patterns induced by the pentagonal subdivision scheme. Furthermore, we present a jigsaw puzzle illustrating both the subdivision process and the induced weaving pattern. These transform the visual and abstract mathematical algorithms into tactile objects that offer exploration possibilities aside from the visual. © 2021, CC BY-NC-ND.

关键词： Fractals

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Head-tracked orbital viewing: an interaction technique for immersive virtual environments 96

Head-tracked orbital viewing: an interaction technique for i...

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Proceedings of the 9th annual ACM symposium on User interface software and technology

作者： David R. Koller Mark R. Mine Scott E. Hudson Graphics Visualization & Usability Center College of Comuputing Georgia Institute of Technology Atlanta GA Department of Computer Science University of North Carolira Chapel Hill NC

No abstract available.

ISBN: (纸本)9780897917988

No abstract available.

关键词： interaction metaphors head-tracking viewpoint selection steering virtual environments

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Low-cost automatic inpainting for artifact suppression in facial images

Low-cost automatic inpainting for artifact suppression in fa...

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8th International Conference on computer Vision Theory and Applications, VISAPP 2013

作者： Sobiecki, André Telea, Alexandru Giraldi, Gilson Neves, Luiz Antonio Pereira Thomaz, Carlos Eduardo Scientific Visualization and Computer Graphics University of Groningen Nijenborgh 9 Groningen Netherlands Department of Computing National Laboratory of Scientific Computation Petŕopolis Brazil Department of Computing Parańa Federal University Curitiba Brazil Department of Artificial Intelligence Applied on Automation University Center of FEI Sao Bernardo do Campo Brazil

ISBN: (纸本)9789898565471

Facial images are often used in applications that need to recognize or identify persons. Many existing facial recognition tools have limitations with respect to facial image quality attributes such as resolution, face position, and artifacts present in the image. In this paper we describe a new low-cost framework for preprocessing low-quality facial images in order to render them suitable for automatic recognition. For this, we first detect artifacts based on the statistical difference between the target image and a set of pre-processed images in the database. Next, we eliminate artifacts by an inpainting method which combines information from the target image and similar images in our database. Our method has low computational cost and is simple to implement, which makes it attractive for usage in low-budget environments. We illustrate our method on several images taken from public surveillance databases, and compare our results with existing inpainting techniques.

关键词： Database systems

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MultiAR: A Multi-User Augmented Reality Platform for Biomedical Education 46

MultiAR: A Multi-User Augmented Reality Platform for Biomedi...

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46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2024

作者： Perz, Markus Luijten, Gijs Kleesiek, Jens Schmalstieg, Dieter Egger, Jan Gsaxner, Christina West German Cancer Center Cancer Research Center Cologne Essen Essen Germany University of Stuttgart Institute for Visualization and Interactive Systems Stuttgart Germany Graz University of Technology Institute of Computer Graphics and Vision Graz Austria University Medicine Essen Institute for Artificial Intelligence in Medicine Essen Germany Essen Germany

ISBN: (纸本)9798350371499

This paper addresses the growing integration of Augmented Reality (AR) in biomedical sciences, emphasizing collaborative learning experiences. We present MultiAR, a versatile, domain-specific platform enabling multi-user interactions in AR for biomedical education. Unlike platform-specific solutions, MultiAR supports various AR devices, including handheld and head-mounted options. The framework extends across domains, augmenting biomedical education applications with collaborative capabilities. We define essential requirements for a multi-user AR framework in education, detail MultiAR's design and implementation, and comprehensively evaluate it using anatomy education examples. Quantitative and qualitative analyses, covering system performance, accuracy metrics, and a user study with 20 participants, highlight the urgent need for a tailored collaborative AR platform in biomedical education. Results underscore enthusiasm for collaborative AR technology, endorsing MultiAR as an accessible, versatile solution for developers and end-users in biomedical education. © 2024 IEEE.

关键词： Augmented reality

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Anisotropic range image integration

Anisotropic range image integration

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Joint 34th Symposium of the German Association for Pattern Recognition, DAGM 2012 and 36th Symposium of the Austrian Association for Pattern Recognition, OAGM 2012

作者： Schroers, Christopher Zimmer, Henning Valgaerts, Levi Bruhn, Andrés Demetz, Oliver Weickert, Joachim Mathematical Image Analysis Group Faculty of Mathematics and Computer Science Saarland University Saarbrücken 66041 Germany Computer Graphics Laboratory Department of Computer Science ETH Zurich Zurich 8092 Switzerland Max-Planck-Institut für Informatik Campus E1.4 Saarbrücken 66123 Germany Institute for Visualization and Interactive Systems University of Stuttgart Universitätsstraße 38 70569 Stuttgart Germany

ISBN: (纸本)9783642327162

Obtaining high-quality 3D models of real world objects is an important task in computer vision. A very promising approach to achieve this is given by variational range image integration methods: They are able to deal with a substantial amount of noise and outliers, while regularising and thus creating smooth surfaces at the same time. Our paper extends the state-of-the-art approach of Zach et al.(2007) in several ways: (i) We replace the isotropic space-variant smoothing behaviour by an anisotropic (direction-dependent) one. Due to the directional adaptation, a better control of the smoothing with respect to the local structure of the signed distance field can be achieved. (ii) In order to keep data and smoothness term in balance, a normalisation factor is introduced. As a result, oversmoothing of locations that are seen seldom is prevented. This allows high quality reconstructions in uncontrolled capture setups, where the camera positions are unevenly distributed around an object. (iii) Finally, we use the more accurate closest signed distances instead of directional signed distances when converting range images into 3D signed distance fields. Experiments demonstrate that each of our three contributions leads to clearly visible improvements in the reconstruction quality. © 2012 Springer-Verlag.

关键词： computer vision

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Riemann-finsler multi-valued geodesic tractography for HARDI 4th

Riemann-finsler multi-valued geodesic tractography for HARDI

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4th Meeting on visualization and Processing of Tensors and Higher Order Descriptors for Multi-Valued Data, 2011

作者： Sepasian, Neda Ten Thije Boonkkamp, Jan H. M. Florack, Luc M. J. Ter Haar Romeny, Bart M. Vilanova, Anna Department of Biomedical Engineering Mathematics and Computer Science Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Mathematics and Computer Science Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Department of Biomedical Engineering Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Faculty Electrical Engineering Mathematics and Computer Science Computer Graphics and Visualization Delft University of Technology Delft Netherlands

ISBN: (纸本)9783642543005

We introduce a geodesic based tractography method for High Angular Resolution Diffusion Imaging (HARDI). The concepts used are similar to the ones in geodesic based tractography for Diffusion Tensor Imaging (DTI). In DTI, the inverse of the second-order diffusion tensor is used to define the manifold where the geodesics are traced. HARDI models have been developed to resolve complex fiber populations within a voxel, and higher order tensors (HOT) are possible representations for HARDI data. In our framework, we apply Finsler geometry, which extends Riemannian geometry to a directionally dependent metric. A Finsler metric is defined in terms of HARDI higher order tensors. Furthermore, the Euler-Lagrange geodesic equations are derived based on the Finsler geometry. In contrast to other geodesic based tractography algorithms, the multi-valued numerical solution of the geodesic equations can be obtained. This gives the possibility to capture all geodesics arriving at a single voxel instead of only computing the shortest one. Results are analyzed to show the potential and characteristics of our algorithm. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Diffusion tensor imaging

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AVIGLE: A system of systems concept for an avionic digital service platform based on Micro Unmanned Aerial Vehicles

AVIGLE: A system of systems concept for an avionic digital s...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Sebastian Rohde Niklas Goddemeier Christian Wietfeld Frank Steinicke Klaus Hinrichs Tobias Ostermann Johanna Holsten Dieter Moormann TU Dortmund University Communication Networks Dortmund Germany Visualization and Computer Graphics WWU Münster Munster Germany Dieter Moormann RWTH Aachen University Aachen Germany WWU Münster Visualization and Computer Graphics Münster Germany RWTH Aachen University Flight Dynamics Aachen Germany Communication Networks Technical University Dortmund Dortmund Germany

Miniaturized unmanned flying robots, also referred to as MUAVs (Micro Unmanned Aerial Vehicles) open up completely new fields of innovative applications in the areas of civil security, cellular networks, surveying, entertainment and media. The AVIGLE project is based on the vision of a novel, widely applicable avionic service platform which supports multiple high-tech services by using open interfaces. Recent developments in the area of lithium polymer batteries and carbon fiber-reinforced plastic materials let MUAVs become an aerial platform, that can be equipped with a variety of sensors such as image or time of flight (ToF) cameras. Furthermore, it is also possible to mount communication technologies on the platform in order to let the MUAVs work as communication hot spots or relais at places where no cellular networks are available. In this paper we present a system of systems concept of an Unmanned Aerial System working as a service platform for different Concepts of Operations (ConOps).

关键词： Three dimensional displays Relays Robots Vehicle dynamics

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Quantifying spatial, temporal, angular and spectral structure of effective daylight in perceptually meaningful ways

arXiv

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arXiv 2022年

作者： Yu, Cehao Wijntjes, Maarten Eisemann, Elmar Pont, Sylvia Faculty of Industrial Design Engineering Delft University of Technology Delft Netherlands Computer Graphics and Visualization Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft Netherlands

We present a method to capture the 7-dimensional light field structure, and translate it into perceptually-relevant information. Our spectral cubic illumination method quantifies objective correlates of perceptually relevant diffuse and directed light components, including their variations over time, space, in color and direction, and the environment’s response to sky and sunlight. We applied it "in the wild", capturing how light on a sunny day differs between light and shadow, and how light varies over sunny and cloudy days. We discuss the added value of our method for capturing nuanced lighting effects on scene and object appearance, such as chromatic gradients. © 2022, CC BY.

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