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Research Interests
- Efficient large scene rendering and editing
- Symmetry detection and scene understanding
- Processing of animated geometry from real-time 3D scanners
- Development of the open source software XGRT (Extensible Graphics Toolkit).
Please see http://www.gris.uni-tuebingen.de/xgrt for details.
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Publications
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Generalized Intrinsic Symmetry Detection
A. Berner, M. Bokeloh, M. Wand, A. Schilling, , H.-P. Seidel,
MPI Informatik Tech Report MPI-I-2009-4-005
paper pdf (6 MB)
Abstract
In this paper, we address the problem of detecting partial symmetries in 3D objects. In contrast to previous work, our algorithm is able to match deformed symmetric parts: We first develop an algorithm for the case of approximately isometric deformations, based on matching graphs of surface feature lines that are annotated with intrinsic geometric properties. The sensitivity to non-isometry is controlled by tolerance parameters for each such annotation. Using large tolerance values for some of these annotations and a robust matching of the graph topology yields a more general symmetry detection algorithm that can detect similarities in structures that have undergone strong deformations. This approach for the first time allows for detecting partial intrinsic as well as more general, non-isometric symmetries...
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Symmetry Detection Using Line Features
M. Bokeloh, A. Berner, M. Wand, H.-P. Seidel, A. Schilling, Computer Graphics Forum (Proceedings of Eurographics) 2009
Project Page (Paper and Videos)
Selected as cover imageof Informatik-Spektrum 32(2), Springer-Verlag, April 2009
Abstract
In this paper, we describe a new algorithm for detecting structural redundancy in geometric data sets. Our algorithm computes rigid symmetries, i.e., subsets of a surface model that recur several times within the model differing only by translation, rotation or mirroring. Our algorithm is based on matching locally coherent constellations of feature lines on the object surfaces. In comparison to previous work, the new algorithm is able to detect a large number of symmetric parts without restrictions to regular patterns or nested hierarchies....
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Efficient Reconstruction of Non-rigid Shape and Motion from Real-Time 3D Scanner Data
M. Wand, B. Adams, M. Ovsjanikov, A. Berner, M. Bokeloh, P. Jenke, L. Guibas, H.-P. Seidel,
A. Schilling, ACM Transactions on Graphics (TOG) Volume 28(2), April 2009, to appear
Paper (Technical Report Version, WSI-2009-01) -
video:
avi/xvid (56 MB) -
quicktime (66 MB)
Abstract
We present a new technique for reconstructing a single shape and its non-rigid motion from 3D scanning data. Our algorithm takes a set of
time-varying unstructured sample points that show partial views of a deforming object as input and reconstructs a single shape and a deformation field that fit the data. This representation yields dense correspondences for the whole sequence, as well as a completed 3D shape in every frame. In addition, the algorithm automatically removes spatial and temporal noise artifacts and outliers from the raw input data. Unlike previous methods, the algorithm does not require any shape template but computes a fitting shape automatically from the input data ...
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A Graph-Based Approach to Symmetry Detection
A. Berner, M. Bokeloh, M. Wand, A. Schilling, H.-P. Seidel, IEEE/EG International Symposium on Volume and Point-Based Graphics, 2008
Project Page (Paper and Slides)
Abstract
Symmetry detection aims at discovering redundancy in the form of recurring structures in geometric objects. In this paper, we present a new symmetry detection algorithm for geometry represented as point clouds that is based on analyzing a graph of surface features. We combine a general feature detection scheme with a RANSAC-based randomized subgraph searching algorithm in order to reliably detect recurring patterns of locally unique structures...
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Slippage Features
M. Bokeloh, A. Berner, M. Wand, H.-P. Seidel, A. Schilling, Technical Report, WSI-2008-03, University of Tübingen, 2008
paper pdf (6 MB) - Poster presentation at Symposium on Geometry Processing 2008 - poster pdf (4 MB)
Abstract
In this report, we present a novel feature detection technique for unstructured point clouds. We introduce a generalized concept of geometric features that detects locally uniquely identifiable keypoints as centroids of area with locally minimal slippage. We extend the concept to multiple scales and extract features using multi-scale mean shift clustering. In order to validate matches between feature points, we employ a two stage technique that ...
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Processing and Interactive Editing of Huge Point Clouds from 3D Scanners
M. Wand, A. Berner, M. Bokeloh, P. Jenke, A. Fleck, M. Hoffmann, B. Maier, D. Staneker, A.Schilling, H.-P. Seidel, Computers & Graphics, Volume 32, Issue 2, 2008
paper (publisher site)
Abstract
Using our new data structure, we provide a complete tool chain for 3D scanner data processing, from data preprocessing and filtering to manual touch-up and real-time visualization. In particular, we describe an out-of-core outlier removal and bilateral geometry filtering algorithm, ....
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Interactive Editing of Large Point Clouds
M. Wand, A. Berner, M. Bokeloh, A. Fleck, M. Hoffmann, P. Jenke, B. Maier, D. Staneker, A. Schilling, Proceedings Symposium on Point-Based Graphics (PBG '07), 2007
pdf (3.9 MB) -
video (46 MB) -
software (binary & source)
Abstract
This paper describes a new out-of-core multi-resolution data structure for real-time visualization and interactive editing of large point clouds. In addition, an editing system is discussed that makes use of the novel data structure to provide interactive editing tools for large scanner data sets. The new data structure provides efficient rendering and allows for handling very large data sets using out-of-core storage. Unlike related previous approaches, it also provides dynamic operations for online insertion, deletion and modification of points with time mostly independent of scene complexity...
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Short CV
- March 2007 - present:
Full-time scientific assistant at the department Graphical-Interactive Systems at the Wilhelm Schickard Institute for Computer Science (WSI/GRIS), University of Tuebingen
- October 2000 - February 2007:
Diploma in Computer Science (Dipl.-Inform.), University of Tuebingen, Germany
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