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Automated classification of crests on pottery sherds using pattern recognition on 2D images

Automated classification of crests on pottery sherds using p...

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20th Eurographics Workshop on graphics and Cultural Heritage, GCH 2022

作者： Ritz, M. Santos, P. Fellner, D.W. Fraunhofer IGD Germany TU-Darmstadt Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038681786

Manual classification of artefacts is a labor intensive process. Based on 2D images and 3D scans of - for example - ceramic shards, we developed a pattern recognition algorithm which automatically extracts relief features for each newly recorded object and tries to automate the classification process. Based on characteristics found, previously unknown objects are automatically corelated to already classified objects of a collection exhibiting the greatest similarity. As a result, classes of artefacts form iteratively, which ultimately also corresponds to the overall goal which is the automated classification of entire collections. The greatest challenge in developing our software approach was the heterogeneity of reliefs, and in particular the fact that current machine learning approaches were out of question due to the very limited number of objects per class. This led to the implementation of an analytical approach that is capable of performing a classification based on very few artefacts. © ISVR,2023 *** rights reserved

关键词： Iterative methods

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Integrating GPU-Accelerated Tetrahedral Mesh Editing and Simulation 1

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11th International Conference on Simulation and Modeling Methodologies, Technologies and Applications, SIMULTECH 2021

作者： Ströter, Daniel Halm, Andreas Krispel, Ulrich Mueller-Roemer, Johannes S. Fellner, Dieter W. Interactive Graphics Systems Group TU Darmstadt Darmstadt Germany Fraunhofer Austria Research GmbH Vienna Austria Institute of Computer Graphics and Knowledge Visualization TU Graz Graz Austria Fraunhofer IGD Darmstadt Germany

ISBN: (数字)9783031231490

ISBN: (纸本)9783031231483

The use of computer-aided methods for the design of parts that must meet functional or stability requirements typically consists of an iterative cycle of design, physical simulation and testing or analysis, followed by redesign, etc. Each step is often performed with a domain-specific tool, e.g., a specific CAD modeling suite. This results in the need to convert the model representation between steps, such as meshing for finite element simulation for example. In recent work, a distributed application framework has been proposed that allows for the interactive modification and simulation of tetrahedral meshes derived from existing CAD models, e.g., to create customized versions of parts that were designed for mass production. This shortens the design cycle by eliminating the need for conversion and switching between tools. In this paper, we present a more detailed description and improvements to this architecture by using GPU parallelization not only for simulation but also for mesh editing, which leads to even shorter iteration cycles. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： computer aided design

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Virtual cutting of anatomical structures

Virtual cutting of anatomical structures

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7th Conference on Medicine Meets Virtual Reality, MMVR 1999

作者： Voß, Gerrit Hahn, James K. Müller, Wolfgang Lindeman, Rob Fraunhofer Institute for Computer Graphics Dep. Visualization and Virtual Reality Rundeturmstr. 6 64283 Darmstadt Germany Laboratory for Advanced Computer Applications in Medicine Institute for Computer Graphics George Washington University Washington DC 20052 United States

ISBN: (纸本)9051994451

In the context of medicine cutting is one of the most important operations. Many surgical tasks start with an incision, allowing the surgeon to access the region of interest, using either conventional or minimal invasive surgery techniques. The work presented herein should be seen in the context of surgical training and preoperative planning using computer assisted medical simulation systems. The main result of this work is the proposed cutting algorithm based on predefined templates. To integrate this approach in the existing surgical training simulator and to handle additional tasks like soft tissue deformation, needed by the medical environment, a generic simulation framework was developed. This framework is able to utilize given multiprocessor- and network-environments to achieve the desired realtime interactivity.

关键词： Image segmentation

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GraMMaCAD: INTERACTIVELY DEFINING SPATIALLY VARYING FGMS ON BREP CAD MODELS

GraMMaCAD: INTERACTIVELY DEFINING SPATIALLY VARYING FGMS ON ...

引用

ASME 2022 International Design Engineering Technical Conferences and computers and Information in Engineering Conference, IDETC-CIE 2022

作者： Luu, Thu Huong Altenhofen, Christian Stork, André Fellner, Dieter TU Darmstadt Interactive Graphics Systems Group Darmstadt64283 Germany Fraunhofer IGD Darmstadt64283 Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Graz8010 Austria

ISBN: (纸本)9780791886212

Additive manufacturing (AM) has enabled control over heterogeneous materials and structures in ways that were not previously possible, including functionally graded materials (FGM). However, typical computer aided design (CAD) systems – mainly based on boundary representations (B-Rep) – are not built for modeling and representing spatially varying material information, which are the key features for designing FGM parts. While volumetric representations (V-Rep) such as tetrahedral or hexahedral meshes, trivariate splines or subdivision solids can hold the necessary FGM information, they are by default not compatible with existing CAD models. Thus, the capabilities of AM motivate enhancing CAD systems to support volumetric material allocation and distribution. We present an interactive, intuitive and efficient interaction concept based on grading features and transition functions for augmenting CAD models with smooth volumetric material gradients for multi-material fabrication using our system called GraMMaCAD (Graded Multi-Material CAD). This concept has the advantage of being extremely versatile, since the material property functions are left to the arbitrariness of the user, who is free to modify their definition as needed. By providing interactive preview modes, the system allows for efficient exploration of the volumetric gradation of the designed FGM part. We fabricated two functional examples that demonstrate the usability of the system and show the ability to quickly augment models with functionally graded material transitions. Copyright © 2022 by ASME.

关键词： Functionally graded materials

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Profiling and Visualizing GPU Memory Access and Cache Behavior of Ray Tracers

Profiling and Visualizing GPU Memory Access and Cache Behavi...

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22nd Eurographics Symposium on Parallel graphics and visualization, EGPGV 2022

作者： von Buelow, Max Riemann, Kai Guthe, Stefan Fellner, Dieter W. Technical University of Darmstadt Germany Germany Fraunhofer IGD Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038681755

Graphical processing units (GPUs) have gained popularity in recent years due to their efficiency in running massively parallel applications. Recent developments have also adapted ray-tracing algorithms to the GPU, where the bottleneck in the overall performance is usually given by the memory bandwidth. In this paper, we present an interactive, web-based visualization tool for GPU memory traces that provides visual insight into the memory and cache behavior of our reference ray tracer, by mapping internal GPU state back onto 3D objects. In order to visualize cache behavior, we use reuse distances on both GPU cache layers that are calculated on the basis of memory traces extracted from a real GPU using binary instrumentation. An advantage of our system is that it runs independently of the ray-tracing program. We further show visualizations of our GPU ray tracer and compare the visualizations of several ray-tracing approaches. We find our work to act as a convenient toolset to gather insights on which data structures and mesh regions can be cached efficiently, and how ray-tracing acceleration structures behave on various input meshes, bounding volume hierarchies, memory layouts, frame buffer resolutions, and work distribution techniques. © 2022 The Author(s) Eurographics Proceedings © 2022 The Eurographics Association.

关键词： visualization

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The arrigo showcase reloaded - Towards a sustainable link between 3D and semantics

The arrigo showcase reloaded - Towards a sustainable link be...

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9th International Symposium on Virtual Reality, Archaeology, and Cultural Heritage, VAST 2008

作者： Havemann, S. Settgast, V. Berndt, R. Eide, O. Fellner, D.W. Institute of Computer Graphics and Knowledge Visualization TU Graz Austria Unit for Digital Documentation University of Oslo Norway TU Darmstadt and Fraunhofer IGD Germany

ISBN: (纸本)9783905674149

It is still a big technical problem to establish a relation between a shape and its meaning in a sustainable way. We present a solution with a markup method that allows to label parts of a 3D object in a similar way to labeling parts of a hypertext. A 3D-markup can serve both as hyperlink and as link anchor, which is the key to bi-directional linking between 3D objects and web documents. Our focus is on a sustainable 3D software infrastructure for application scenarios ranging from e-mail and internet over authoring and browsing semantic networks to interactive museum presentations. We demonstrate the workflow and the effectiveness of our tools by re-doing the Arrigo 3D showcase. We are working towards a "best practice" example for information modeling in cultural heritage. ©The Eurographics Association 2008.

关键词： Hypertext systems

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Optimization of an autostereoscopic display for a driving simulator

Optimization of an autostereoscopic display for a driving si...

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International Conference on computer graphics Theory and Applications, GRAPP 2013 and International Conference on Information visualization Theory and Applications, IVAPP 2013

作者： Eggeling, Eva Fellner, Dieter W. Halm, Andreas Ullrich, Torsten Fraunhofer Austria Research GmbH Inffeldgasse 16c Graz Austria Institute of Computer Graphics and Knowledge Visualization TU Graz Graz Austria GRIS TU Darmstadt and Fraunhofer IGD Darmstadt Germany

ISBN: (纸本)9789898565464

In this paper, we present an algorithm to optimize a 3D stereoscopic display based on parallax barriers for a driving simulator. The main purpose of the simulator is to enable user studies in reproducible laboratory conditions to test and evaluate driving assistance systems. The main idea of our optimization approach is to determine by numerical analysis the best pattern for an autostereoscopic display with the best image separation for each eye, integrated into a virtual reality environment. Our implementation uses a differential evolution algorithm, which is a parallel, direct search method based on evolution strategies, because it converges fast and is inherently parallel. This allows an execution on a network of computers. The resulting algorithm allows optimizing the display and its corresponding pattern, such that a single user in the simulator environment sees a stereoscopic image without being supported by special eye-wear.

关键词： Global optimization

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Interaction Analysis: An Algorithm for Interaction Prediction and Activity Recognition in Adaptive Systems

Interaction Analysis: An Algorithm for Interaction Predictio...

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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： Christian Stab Kawa Nazemi Dieter W.Fellner 3D Knowledge Worlds and Semantics Visualization Fraunhofer Institute for Computer Graphics Research 3D Knowledge Worlds and Semantics Visualization Fraunhofer Institute for Computer Graphics Research

Predictive statistical models are used in the area of adaptive user interfaces to model user behavior and to infer user information from interaction events in an implicit and non-intrusive way. This information constitutes the basis for tailoring the user interface to the needs of the individual user. Consequently, the user analysis process should model the user with information, which can be used in various systems to recognize user activities, intentions and roles to accomplish an adequate adaptation to the given user and his current task. In this paper we present the improved prediction algorithm KO*/19, which is able to recognize, beside interaction predictions, behavioral patterns for recognizing user activities. By means of this extension, the evaluation shows that the KO*/19Algorithm improves the Mean Prediction Rank more than 19％ compared to other well-established prediction algorithms.

关键词： Predictive Statistical Model Activity Recognition User Modeling Adaptive User Interfaces

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Search and retrieval in CAD databases a user-centric state-of-the-art overview 12

Search and retrieval in CAD databases a user-centric state-o...

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12th International Joint Conference on computer Vision, Imaging and computer graphics Theory and Applications, VISIGRAPP 2017

作者： Schinko, Christoph Vosgien, Thomas Prante, Thorsten Schreck, Tobias Ullrich, Torsten Fraunhofer Austria Research GmbH Visual Computing Graz Graz Austria Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Graz Austria V-Research GmbH Dornbirn Austria

ISBN: (纸本)9789897582240

This article presents a state-of-the-art overview on shape, information and design retrieval systems in the context of CAD engineering. In contrast to existing surveys, we classify the different approaches from a CAD application user point of view. As a consequence, we focus on features of surveyed techniques such as: Supported shape data types, handling of geometric invariances, support of metadata, supported query types, quality of retrieval results, and the availability of implementations. © 2017 by SCITEPRESS - Science and Technology Publications, Lda.

关键词： computer aided design

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Graph-based combinations of fragment descriptors for improved 3D object retrieval 12

Graph-based combinations of fragment descriptors for improve...

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3rd ACM Multimedia Systems Conference, MMSys'12

作者： Schreck, Tobias Scherer, Maximilian Walter, Michael Bustos, Benjamin Yoon, Sang Min Kuijper, Arjan Data Analysis and Visualization Group University of Konstanz Germany Interactive Graphics Systems Technische Universität Darmstadt Germany KDW+PRISMA Department of Computer Science University of Chile Chile Yonsei Institute of Convergence Technology Yonsei University Korea Republic of Fraunhofer Institute for Computer Graphics Research Darmstadt Germany

ISBN: (纸本)9781450311311

3D Object Retrieval is an important field of research with many application possibilities. One of the main goals in this research is the development of discriminative methods for similarity search. The descriptor-based approach to date has seen a lot of research attention, with many different extraction algorithms proposed. In previous work, we have introduced a simple but effective scheme for 3D model retrieval based on a spatially fixed combination of 3D object fragment descriptors. In this work, we propose a novel flexible combination scheme based on finding the best matching fragment descriptors to use in the combination. By an exhaustive experimental evaluation on established benchmark data we show the capability of the new combination scheme to provide improved retrieval effectiveness. The method is proposed as a versatile and inexpensive method to enhance the effectiveness of a given global 3D descriptor approach. © 2012 ACM.

关键词： Self organizing maps

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