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3rd International Workshop on visualization in Medicine and Life Sciences, VMLS 2013

作者： Fangerau, Jens Höckendorf, Burkhard Rieck, Bastian Heine, Christian Wittbrodt, Joachim Leitte, Heike Computer Graphics and Visualization Heidelberg University Heidelberg Germany Centre for Organismal Studies Heidelberg University Heidelberg Germany Scientific Visualization Group ETH Zürich Zürich Switzerland

ISBN: (纸本)9783319245218

Automatic feature tracking is widely used for the analysis of timedependent data. If the features exhibit splitting behavior, it is best characterized by tree-like tracks. For a large number of time steps, each with numerous features, these data become increasingly difficult to analyze. In this paper, we focus on the problem of comparing and contrasting hundreds to thousands of trees to support developmental biologists in their study of cell division patterns in embryos. To this end, we propose a new visual analytics method called structure map. This two-dimensional, color-coded map arranges trees into tiles along a Hilbert curve, preserving a tree similarity measure, which we define via graph Laplacians. The structure map supports both global and local analysis based on user-selected tree descriptors. It helps analysts identify similar trees, observe clustering and sizes of clusters within the forest, and detect outliers in a compact and uniform representation. We apply the structure map for analyzing 3D cell tracking from two periods of zebrafish embryogenesis: blastulation to early epiboly and tailbud extension. In both cases, we show how the structure map supported biologists to find systematic differences in the data set as well as detect erroneous cell behaviors. © Springer International Publishing Switzerland 2016.

关键词： Cell proliferation

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Skin: A constructive approach to modeling free-form shapes 99

Skin: A constructive approach to modeling free-form shapes

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26th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1999

作者： Markosian, Lee Cohen, Jonathan M. Crulli, Thomas Hughes, John Brown University Site of the NSF Technology Center for Computer Graphics and Scientific Visualization Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)0201485605

We present a new particle-based surface representation with which a user can interactively sculpt free-form surfaces. The particles maintain mesh connectivity and operate under rules that lead them to form triangulations with properties that make them suitable for use in subdivision. A user interactively guides the particles, which we call skin, to grow over a given collection of polyhedral elements (or skeletons), yielding a smooth surface (through subdivision) that approximates the underlying skeletal shapes. Skin resembles blobby modeling in the constructive approach to modeling it supports, but allows a richer vocabulary of skeleton shapes, supports sharp creases where desired, and provides a convenient mechanism for adding multiresolution surface detail. Copyright ACM 1999.

关键词： Musculoskeletal system

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Direct Elastic Unrollings of Painted Pottery Surfaces from Sparse Image Sets

Direct Elastic Unrollings of Painted Pottery Surfaces from S...

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2021 Eurographics Workshop on graphics and Cultural Heritage, EG GCH 2021

作者： Houska, Peter Lengauer, Stefan Karl, Stephan Preiner, Reinhold Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria University of Graz Institute of Classics Austria

ISBN: (纸本)9783038681410

An important task in archaeological research is the comparison of painted motifs on ancient vessels and the analysis of their painting style. Ideally, the pottery objects are available as scanned 3D models, from which the painted surface can be unrolled and potential distortions minimized, so that the vase painting and its individual motifs can be directly inspected. Unfortunately, the percentage of digitally captured vessels is small compared to the large body of cataloged photographs. In this paper, we present a method that creates distortion-minimized unrollings of painted pottery surfaces directly from a small set of photographs. We achieve this by exploiting prior knowledge about the data, namely that most objects exhibit rotational symmetry and that strict guidelines were followed when capturing photographs of the ancient vases. Based on the distinctly visible object silhouettes in the photographs we are able to extract proxy geometries of the objects which we encode as per-view geometric maps. By stitching the single-view data, we obtain a combined map capturing the geometry and texture of the entire painted surface. This enables us to minimize typical projective distortions by elastic relaxation. Our pipeline works entirely in 2D image space, circumventing time-consuming 3D scans and surface reconstructions of (often inaccessible) vessels. Using a combination of CPU-based image processing and GPU-based relaxation, results are produced in only a few minutes. © 2021 The Eurographics Association.

关键词： Geometry

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A distributed object repository for cultural heritage 11

A distributed object repository for cultural heritage

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11th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage, VAST 2010

作者： Pan, X. Beckmann, P. Havemann, S. Tzompanaki, K. Doerr, M. Fellner, D.W. Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Institute of Computer Science FORTH Crete Greece TU Darmstadt Fraunhofer IGD Germany

ISBN: (纸本)9783905674293

This paper describes the design and the implementation of a distributed object repository that offers cultural heritage experts and practitioners a working platform to access, use, share and modify digital content. The principle of collecting paradata to document each step in a potentially long sequence of processing steps implies a number of design decisions for the data repository, which are described and explained. Furthermore, we provide a description of the concise API our implementation. Our intention is to provide an easy-to-understand recipe that may be valuable also for other data repository implementations that incorporate and operationalize the more theoretical concepts of intellectual transparency, collecting paradata, and compatibility to semantic networks. © The Eurographics Association 2010.

关键词： Semantics

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AI Based Image Segmentation of Cultural Heritage Objects used for Multi-View Stereo 3D Reconstructions

AI Based Image Segmentation of Cultural Heritage Objects use...

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2023 Eurographics Workshop on graphics and Cultural Heritage, GCH 2023

作者： Kutlu, H. Brucker, F. Kallendrusch, B. Santos, P. Fellner, D.W. TU Darmstadt & Fraunhofer IGD Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038682172

Image segmentation (or masking) finds a very useful use case within 3D reconstruction of cultural heritage objects. The 3D reconstructions can be accelerated, reconstructing the object without any background noise. Conventional segmentation methods can calculate erroneous masks for certain objects and environments, which can lead to errors within the reconstruction: Parts of the 3D reconstruction may be missing or are incorrectly reconstructed, which contradicts adequate archiving. The automated iterative Multi-View Stereo (MVS) scanning process makes it necessary to obtain masks that reconstruct the object in the best possible way, regardless of the environment, the stabilizing mount, the color of the background and the object. In addition, it should not be necessary to tweak the best possible parameters for conventional masking procedures and to create masks manually. State-of-the-art artificial intelligence (AI) segmentation networks will be trained and applied to the MVS scans to verify the behavior of the associated 3D reconstructions and the automated iterative scanning process. In addition, a comparison between different AI segmentation networks and a comparison between conventional masking methods and AI segmentation networks is performed. © ISVR,2023 *** rights reserved

关键词： Image segmentation

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Granularity in the design of interactive illustrations 13

Granularity in the design of interactive illustrations

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13th SIGCSE Technical Symposium on computer Science Education, SIGCSE 1999

作者： Gould, Daniel L. Simpson, Rosemary M. Van Dam, Andries Brown University NSF Science and Technology Center Computer Graphics and Scientific Visualization Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)9781581130850

We describe some issues in designing and building educational Java applets for an introductory computer graphics course. The design problem involves balancing educational goals of building intuition about fundamental concepts in a domain against heterogeneity both in subject material and in student backgrounds. We present our design approach for resolving these forces - fine-grained units addressing small concepts - and discuss its effects on other areas including hypertext structure, interface design, and software engineering. © 1999 ACM.

关键词： User interfaces

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A dense medial descriptor for image analysis

A dense medial descriptor for image analysis

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

作者： Van Der Zwan, Matthew Meiburg, Yuri Telea, Alexandru Scientific Visualization and Computer Graphics University of Groningen Nijenborgh 9 Groningen Netherlands University of Medicine and Pharmacy Carol Davila Bucharest Romania

ISBN: (纸本)9789898565471

We present dense medial descriptors, a new technique which generalizes the well-known medial axes to encode and manipulate whole 2D grayvalue images, rather than binary shapes. To compute our descriptors, we first reduce an image to a set of threshold-sets in luminance space. Next, we compute a simplified representation of each threshold-set using a noise-resistant medial axis transform. Finally, we use these medial axis transforms to perform a range of operations on the input image, from perfect reconstruction to segmentation, simplification, and artistic effects. Our pipeline can robustly handle any 2D grayscale image, is easy to use, and allows an efficient CPU or GPU-based implementation. We demonstrate our dense medial descriptors with several image-processing applications.

关键词： Image segmentation

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DUODECIM - a structure for point scan compression and rendering

DUODECIM - a structure for point scan compression and render...

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Eurographics/IEEE VGTC Symposium Proceedings on Point-Based graphics, PBG

作者： J. Kruger J. Schneider R. Westermann Computer Graphics and Visualization Group Technical University Munich Germany Computer Graphics and Visualization Group Technical University Munich

In this paper we present a compression scheme for large point scans including per-point normals. For the encoding of such scans we introduce a particular type of closest sphere packing grids, the hexagonal close packing (HCP). HCP grids provide a structure for an optimal packing of 3D space, and for a given sampling error they result in a minimal number of cells if geometry is sampled into these grids. To compress the data, we extract linear sequences (runs) of filled cells in HCP grids. The problem of determining optimal runs is turned into a graph theoretical one. Point positions and normals in these runs are incrementally encoded. At a grid spacing close to the point sampling distance, the compression scheme only requires slightly more than 3 bits per point position. Incrementally encoded per-point normals are quantized at high fidelity using only 5 bits per normal. The compressed data stream can be decoded in the graphics processing unit (GPU). Decoded point positions are saved in graphics memory, and they are then used on the GPU again to render point primitives. In this way we render gigantic point scans from their compressed representation in local GPU memory at interactive frame rates.

关键词： Rendering (computer graphics) computer graphics Decoding Central Processing Unit Hardware Displays Image coding Sampling methods Lenses visualization

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A survey of dimension reduction methods for high-dimensional data analysis and visualization

A survey of dimension reduction methods for high-dimensional...

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International Research and Training Group 1131 Workshop on visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2011

作者： Engel, Daniel Hüttenberger, Lars Hamann, Bernd Computer Graphics and HCI Group University of Kaiserslautern Germany CS Department Institute for Data Analysis and Visualization University of California Davis United States

ISBN: (纸本)9783939897460

Dimension reduction is commonly defined as the process of mapping high-dimensional data to a lower-dimensional embedding. Applications of dimension reduction include, but are not limited to, filtering, compression, regression, classification, feature analysis, and visualization. We review methods that compute a point-based visual representation of high-dimensional data sets to aid in exploratory data analysis. The aim is not to be exhaustive but to provide an overview of basic approaches, as well as to review select state-of-the-art methods. Our survey paper is an introduction to dimension reduction from a visualization point of view. Subsequently, a comparison of state-of-the-art methods outlines relations and shared research foci.

关键词： visualization

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Embedding biomolecular information in a scene graph system 2nd

Embedding biomolecular information in a scene graph system

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2nd International Workshop on visualization in Medicine and Life Sciences, VMLS 2009

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

ISBN: (纸本)9783642543005

We present the Bio Scene Graph (BioSG) for visualization of biomolecular structures based on the scene graph system OpenSG. The hierarchical model of primary, secondary and tertiary structures of molecules used in the organic chemistry is mapped to a graph of nodes when loading molecular files. We show that using BioSG, displaying molecules can be integrated in other applications, for example in medical applications. Additionally, existing algorithms and programs can be easily adapted to display the results with BioSG. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Medical applications

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