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11.
M. Schulze J. Martinez Esturo T. Günther C. Rössl H.‐P. Seidel T. Weinkauf H. Theisel 《Computer Graphics Forum》2014,33(3):1-10
Stream surfaces are a well‐studied and widely used tool for the visualization of 3D flow fields. Usually, stream surface seeding is carried out manually in time‐consuming trial and error procedures. Only recently automatic selection methods were proposed. Local methods support the selection of a set of stream surfaces, but, contrary to global selection methods, they evaluate only the quality of the seeding lines but not the quality of the whole stream surfaces. Global methods, on the other hand, only support the selection of a single optimal stream surface until now. However, for certain flow fields a single stream surface is not sufficient to represent all flow features. In our work, we overcome this limitation by introducing a global selection technique for a set of stream surfaces. All selected surfaces optimize global stream surface quality measures and are guaranteed to be mutually distant, such that they can convey different flow features. Our approach is an efficient extension of the most recent global selection method for single stream surfaces. We illustrate its effectiveness on a number of analytical and simulated flow fields and analyze the quality of the results in a user study. 相似文献
12.
13.
Michael Wand Alexander Berner Martin Bokeloh Philipp Jenke Arno Fleck Mark Hoffmann Benjamin Maier Dirk Staneker Andreas Schilling Hans-Peter Seidel 《Computers & Graphics》2008,32(2):204-220
This paper describes a new out-of-core multi-resolution data structure for real-time visualization, interactive editing and externally efficient processing of large point clouds. We describe an editing system that makes use of the novel data structure to provide interactive editing and preprocessing tools for large scanner data sets. Using the 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, a toolset for interactive selection, painting, transformation, and filtering of huge out-of-core point-cloud data sets and a real-time rendering algorithm, which all use the same data structure as storage backend. The interactive tools work in real-time for small model modifications. For large scale editing operations, we employ a two-resolution approach where editing is planned in real-time and executed in an externally efficient offline computation afterwards. We evaluate our implementation on example data sets of sizes up to 63 GB, demonstrating that the proposed technique can be used effectively in real-world applications. 相似文献
14.
Kuangyu Shi Hans-Peter Seidel Holger Theisel Tino Weinkauf Hans-Christian Hege 《Computer Graphics and Applications, IEEE》2008,28(5):24-36
This article focuses on the transport characteristics of physical properties in fluids-in particular, visualizing the finite-time transport structure of property advection. Applied to a well-chosen set of property fields, the proposed approach yields structures giving insights into the underlying flow's dynamic processes. 相似文献
15.
R. Strauss G. Angloher A. Bento C. Bucci L. Canonica X. Defay A. Erb F. v. Feilitzsch N. Ferreiro Iachellini P. Gorla A. Gütlein D. Hauff J. Jochum M. Kiefer H. Kluck H. Kraus J. C. Lanfranchi J. Loebell A. Münster C. Pagliarone F. Petricca W. Potzel F. Pröbst F. Reindl K. Schäffner J. Schieck S. Schönert W. Seidel L. Stodolsky C. Strandhagen A. Tanzke H. H. Trinh Thi C. Türkoglu M. Uffinger A. Ulrich I. Usherov S. Wawoczny M. Willers M. Wüstrich A. Zöller 《Journal of Low Temperature Physics》2016,184(3-4):866-872
16.
Oxidative Stress Imaging: Visualizing Oxidative Cellular Stress Induced by Nanoparticles in the Subcytotoxic Range Using Fluorescence Lifetime Imaging (Small 23/2018)
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17.
Toward a theory of managing creativity-intensive processes: a creative industries study 总被引:1,自引:0,他引:1
Stefan Seidel 《Information Systems and E-Business Management》2011,9(4):407-446
This paper reports the results of an exploratory, theory-building study on the impact of creativity on business processes,
their management, and the use of information technology (IT) in particular. The empirical evidence was derived from organizations
within the creative industries, specifically film and visual effects (VFX) production. An adapted grounded theory approach
was employed in order to analyze the data. The study identifies the dynamics of business processes that can be described as
highly dependent on creativity, intensively involving the client, complex, and interdependent. It explains the processes’
organizational context as well as strategies and IT systems that organizations use in order to manage these processes. The
study suggests that creativity-intensive processes are characterized by high levels of uncertainty with regard to outcome,
process structure, and required resources. Creative organizations pursue both creative and operational process performance
while simultaneously mitigating creative and operational risk. 相似文献
18.
Matthias Winter Gregor Feiertag Anton Leidl Helmut Seidel 《Microsystem Technologies》2010,16(5):809-815
This paper describes the influence of a chip scale MEMS package (CSMP) on the acoustic behaviour of a silicon microphone.
The influence was calculated using an electro-mechanical–acoustical equivalent circuit. Standard packaging of microphones
using die bonding and wire bonding leads to a large front volume which acts as a Helmholtz resonator. This can dramatically
influence the frequency response of the microphone system by adding a second resonance. In the worst case this second resonance
is in the acoustic frequency range, thus degrading its performance in an unacceptable way. In case of the CSMP only a small
front volume is generated between the substrate and the flip-chipped microphone chip. Thus the resonance step-up is very small
compared to standard packages. Furthermore the frequency response can be flattened by optimizing the geometry of the small
sound holes in the substrate. By choosing an appropriate geometry of these sound holes the package can act as a low pass filter
where the cut-off frequency can be placed to the desired value of the acoustic spectrum. 相似文献
19.
Schultz Thomas Theisel Holger Seidel Hans-Peter 《IEEE transactions on visualization and computer graphics》2010,16(1):109-119
Crease surfaces are two-dimensional manifolds along which a scalar field assumes a local maximum (ridge) or a local minimum (valley) in a constrained space. Unlike isosurfaces, they are able to capture extremal structures in the data. Creases have a long tradition in image processing and computer vision, and have recently become a popular tool for visualization. When extracting crease surfaces, degeneracies of the Hessian (i.e., lines along which two eigenvalues are equal) have so far been ignored. We show that these loci, however, have two important consequences for the topology of crease surfaces: First, creases are bounded not only by a side constraint on eigenvalue sign, but also by Hessian degeneracies. Second, crease surfaces are not, in general, orientable. We describe an efficient algorithm for the extraction of crease surfaces which takes these insights into account and demonstrate that it produces more accurate results than previous approaches. Finally, we show that diffusion tensor magnetic resonance imaging (DT-MRI) stream surfaces, which were previously used for the analysis of planar regions in diffusion tensor MRI data, are mathematically ill-defined. As an example application of our method, creases in a measure of planarity are presented as a viable substitute. 相似文献
20.
Nils Hasler Carsten Stoll Bodo Rosenhahn Thorsten Thormhlen Hans-Peter Seidel 《Computers & Graphics》2009,33(3):211
The paper presents a method to estimate the detailed 3D body shape of a person even if heavy or loose clothing is worn. The approach is based on a space of human shapes, learned from a large database of registered body scans. Together with this database we use as input a 3D scan or model of the person wearing clothes and apply a fitting method, based on ICP (iterated closest point) registration and Laplacian mesh deformation. The statistical model of human body shapes enforces that the model stays within the space of human shapes. The method therefore allows us to compute the most likely shape and pose of the subject, even if it is heavily occluded or body parts are not visible. Several experiments demonstrate the applicability and accuracy of our approach to recover occluded or missing body parts from 3D laser scans. 相似文献