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  1. Book ; Online ; E-Book: Visualization in medicine and life sciences III

    Linsen, Lars / Hamann, Bernd / Hege, Hans-Christian

    towards making an impact

    (Mathematics and visualization)

    2016  

    Author's details Lars Linsen, Bernd Hamann, Hans-Christian Hege editors
    Series title Mathematics and visualization
    Keywords Medizin ; Bildgebendes Verfahren ; Visualisierung
    Subject Sichtbarmachung ; Datenvisualisierung ; Visuelle Darstellung ; Bildgebendes Diagnoseverfahren ; Diagnostik ; Bilddiagnostik ; Bildgebende Methode ; Medical Imaging ; Medizinische Bildgebung ; Bildgebende Diagnostik ; Bildgebende Verfahren ; Imaging ; Humanmedizin ; Heilkunst ; Medicine
    Subject code 610
    Language German
    Size 1 Online-Ressource (viii, 352 Seiten), Illustrationen
    Publisher Springer
    Publishing place Cham
    Publishing country Switzerland
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    HBZ-ID HT019455645
    ISBN 978-3-319-24523-2 ; 9783319245218 ; 3-319-24523-6 ; 331924521X
    DOI 10.1007/978-3-319-24523-2
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Article ; Online: A Local Approach for Computing Smooth B-Spline Surfaces for Arbitrary Quadrilateral Base Meshes

    Mosbach, Dennis / Schladitz, Katja / Hamann, Bernd / Hagen, Hans

    2021  

    Abstract: We present a method for approximating surface data of arbitrary topology by a model of smoothly connected B-spline surfaces. Most of the existing solutions for this problem use constructions with limited degrees-of-freedom or they address smoothness ... ...

    Abstract We present a method for approximating surface data of arbitrary topology by a model of smoothly connected B-spline surfaces. Most of the existing solutions for this problem use constructions with limited degrees-of-freedom or they address smoothness between surfaces in a post-processing step, often leading to undesirable surface behavior in proximity of the boundaries. Our contribution is the design of a local method for the approximation process. We compute a smooth B-spline surface approximation without imposing restrictions on the topology of a quadrilateral base mesh defining the individual B-spline surfaces, the used B-spline knot vectors, or the number of B-spline control points. Exact tangent plane continuity can generally not be achieved for a set of B-spline surfaces for an arbitrary underlying quadrilateral base mesh. Our method generates a set of B-spline surfaces that lead to a nearly tangent plane continuous surface approximation and is watertight, i.e., continuous. The presented examples demonstrate that we can generate B-spline approximations with differences of normal vectors along shared boundary curves of less than one degree. Our approach can also be adapted to locally utilize other approximation methods leading to higher orders of continuity.

    22

    1
    Keywords big data and analytics ; computational geometry ; computer-aided design ; virtual prototyping ; DDC::500 Naturwissenschaften und Mathematik
    Subject code 518
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Segmenting Cellular Retinal Images by Optimizing Super-pixels, Multi-level Modularity, and Cell Boundary Representation.

    Linares, Oscar Cuadros / Hamann, Bernd / Neto, Joao Batista

    IEEE transactions on image processing : a publication of the IEEE Signal Processing Society

    2019  

    Abstract: We introduce an interactive method for retina layer segmentation in gray-level and RGB images based on super-pixels, multi-level optimization of modularity, and boundary erosion. Our method produces highly accurate segmentation results and can segment ... ...

    Abstract We introduce an interactive method for retina layer segmentation in gray-level and RGB images based on super-pixels, multi-level optimization of modularity, and boundary erosion. Our method produces highly accurate segmentation results and can segment very large images. We have evaluated our method with two datasets of 2D confocal microscopy (CM) images of a mammalian retina.We have obtained average Jaccard index values of 0.948 and 0.942 respectively, confirming the high-quality segmentation performance of our method relative to a known ground truth segmentation. Average processing time was two seconds.
    Language English
    Publishing date 2019-08-27
    Publishing country United States
    Document type Journal Article
    ISSN 1941-0042
    ISSN (online) 1941-0042
    DOI 10.1109/TIP.2019.2936743
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: A synthetic case study of measuring the misfit between 4D seismic data and numerical reservoir simulation models through the Momenta Tree

    Soriano-Vargas, Aurea / Rollmann, Klaus / Almeida, Forlan / Davolio, Alessandra / Hamann, Bernd / Schiozer, Denis J / Rocha, Anderson

    Computers & geosciences. 2020 Dec., v. 145

    2020  

    Abstract: Data assimilation is an important and time-consuming process in petroleum reservoir numerical simulation. It produces a set of calibrated models used to forecast and optimize oil and gas production. The process focuses on reducing uncertainties related ... ...

    Abstract Data assimilation is an important and time-consuming process in petroleum reservoir numerical simulation. It produces a set of calibrated models used to forecast and optimize oil and gas production. The process focuses on reducing uncertainties related to reservoir properties, yielding numerical reservoir models that plausibly reproduce measured data from the field, such as well rates and pressure.Besides the traditional well-production data, 4D seismic data are increasingly being used to reduce the uncertainty of numerical reservoir models, by providing dynamic spatial data to be matched. Although 4D seismic data reveal essential information about the dynamic behavior of the reservoir, its integration in data assimilation procedures is challenging, especially in a quantitative way, because of their noisy and uncertain nature and their larger resolution when compared to the resolution of simulated data from numerical reservoir models.The development of metrics able to efficiently estimate the discrepancies between 4D seismic data and numerical reservoir model outputs is a current research interest for data assimilation, given the challenges of integrating these different types of data.We introduce the Momenta Tree. It uses orthogonal moments supporting a multi-level data representation, where features are organized in nodes related to different levels of region detail. It supports the comparison of simulated data from numerical reservoir models and observed 4D images of seismic data, images, using different resolutions and considering various domains. The similarity between data is calculated with the extended Jaccard distance and is represented by a phylogenetic tree; the simulated models are represented as circles in branches, and their similarity is captured by connections. We apply the Momenta Tree to a controlled case, introduced in this paper, to validate and compare the new metric with traditional metrics, and a more complex representative case based on real oil industry data.Our results show that the Momenta Tree metric retains the same sequential similarity in environments affected by noise. The highest-ranked models using the Momenta Tree relate to forecast behavior closer to the reference data than the highest-ranked models obtained with traditional methods. An additional advantage of the Momenta Tree is its ability to enable data comparison in various domains (P-impedance and Water Saturation) at different resolutions of seismic and simulation data.
    Keywords case studies ; geophysics ; industry ; oil fields ; oils ; phylogeny ; spatial data ; uncertainty
    Language English
    Dates of publication 2020-12
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0098-3004
    DOI 10.1016/j.cageo.2020.104617
    Database NAL-Catalogue (AGRICOLA)

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  5. Book: Teilvorhaben D: Entwicklung und Herstellung von Verbundsicherheitsglas und von Vakuum-Isolierglas auf Basis von 2-mm-ESG

    Hamann, Bernd
    Title variant GLASING Initiative - Safety glass composite systems ; Sub-project D: Development and production of laminated safety glass and of vacuum insulation glass on the basis of 2-mm tempered glass plant
    Institution Visio-Glas GmbH <Suelzfeld>, Amalienruher Weg 1, 98617, Suelzfeld, DE
    Keywords Technischer Fortschritt ; Produktionstechnik ; Massenbezogenheit ; Waermedaemmung ; Glas ; Verfahrenstechnik ; Fenster (Bauteil) ; Bewertung ; Waermeschutzfenster ; Bauwirtschaft ; Baustoffindustrie ; Verglasung ; Werkstoff ; Werkstoffkunde ; Aussenwirtschaft ; Osteuropa ; Naher Osten ; Asien
    Document type Book
    Remark project start: 04/01/2007 project end: 03/31/2010 grant ID: 03WKBE3D
    Database Environmental research database (UFORDAT) of the German Federal Environment Agency (UBA)

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  6. Article ; Online: Fiber segmentation in crack regions of steel fiber reinforced concrete using principal curvature

    Kronenberger, Markus / Schladitz, Katja / Hamann, Bernd / Hagen, Hans

    2018  

    Abstract: S.127-137 ... This paper tackles the non-trivial image-processing task to segment hook-ended fibers in three-dimensional images. For this purpose, a novel segmentation method is presented that relies on the following observation: For a single fiber the ... ...

    Abstract S.127-137

    This paper tackles the non-trivial image-processing task to segment hook-ended fibers in three-dimensional images. For this purpose, a novel segmentation method is presented that relies on the following observation: For a single fiber the configurations of principal curvatures that can occur on its surface are limited. Deviations from these configurations indicate potential overlaps of fibers. The method that was developed based on this observation is used to separate several simulated clusters of touching fibers as a proof-of-concept. Further, it is applied to two images of cracked steel fiber reinforced concrete specimens arising from a 4-point bending test. The method's performance is compared to manual separation. Overall, we can state that the proposed method yields satisfying results when data meets the following criteria: Low fiber volume density, circular fiber cross section and sufficient spatial resolution of fiber-fiber contacts.

    37

    Nr.2
    Keywords 003 ; 570 ; 006 ; 519
    Subject code 621
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Book ; Online ; Thesis: Acquisition and On-line Reconstruction of 3D Point Data from Hand-held Laser Scanners and Multi-camera Stereo-matching

    Denker, Klaus / Hagen, Hans / Hamann, Bernd / Umlauf, Georg

    2014  

    Author's details Klaus Denker. Betreuer: Hans Hagen; Bernd Hamann; Georg Umlauf
    Language English
    Size Online-Ressource
    Publisher Technische Universität Kaiserslautern
    Publishing place Kaiserslautern
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Kaiserslautern, Technische Universität Kaiserslautern, Diss., 2014
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  8. Book ; Online ; Thesis: Explorative and Model-based Visual Analysis of Multivariate Data

    Engel, Daniel / Hagen, Hans / Hamann, Bernd

    2014  

    Author's details Daniel Engel. Betreuer: Hans Hagen; Bernd Hamann
    Language English
    Size Online-Ressource
    Publisher Technische Universität Kaiserslautern
    Publishing place Kaiserslautern
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Kaiserslautern, Technische Universität Kaiserslautern, Diss., 2014
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Book ; Online ; Thesis: Acquisition and On-line Reconstruction of 3D Point Data from Hand-held Laser Scanners and Multi-camera Stereo-matching

    Denker, Klaus / Hagen, Hans / Hamann, Bernd / Umlauf, Georg

    2014  

    Author's details Klaus Denker. Betreuer: Hans Hagen; Bernd Hamann; Georg Umlauf
    Language English
    Size Online-Ressource
    Publisher Technische Universität Kaiserslautern
    Publishing place Kaiserslautern
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Kaiserslautern, Technische Universität Kaiserslautern, Diss., 2014
    Database Former special subject collection: coastal and deep sea fishing

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  10. Book ; Online ; Thesis: Virtual Reality Methods for Research in the Geosciences

    Westerteiger, Rolf / Garth, Christoph / Hagen, Hans / Hamann, Bernd

    2014  

    Author's details Rolf Westerteiger. Betreuer: Hans Hagen; Bernd Hamann; Christoph Garth
    Language English
    Size Online-Ressource
    Publisher Technische Universität Kaiserslautern
    Publishing place Kaiserslautern
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Technische Universität Kaiserslautern, Diss.--Kaiserslautern, 2014
    Database Former special subject collection: coastal and deep sea fishing

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