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IEEE Virtual Reality Conference

作者： Dimitar Valkov John Martens Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science at the University of Münster Germany

ISBN: (纸本)9781509008377

It is well known that distance estimation in immersive virtual reality environments suffers from compression when viewed from an egocentric perspective with a head mounted display. While previous research indicates that providing the user with a virtual avatar with high geometric and motion fidelity may alleviate this problem, little work has been done to investigate which properties of the avatar's representation influence the distance estimation and how. In this poster we report the results of an evaluation of the user's distance perception with different avatar representations. Our results indicate that anthropometric fidelity of the avatar has stronger effect on the distance perception than its visual fidelity.

关键词： 1.3.3 [computer graphics]: Three-Dimensional graphics and Realism-Virtual reality

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PO-260 Deep phenotyping of colorectal cancers by high-dimensional mass cytometry reveals tumor-specific immune landscapes

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ESMO Open 2018年 3卷 A328-A329页

作者： Vries, N. De Unen, V. Van Abdelaal, T. Herk, M. Van Van der Breggen, R. Sarasqueta, A. Farina Höllt, T. Lelieveldt, B. Koning, F. Miranda, N. De Leiden University Medical Center Immunohematology and Blood Transfusion Leiden The Netherlands Delft University of Technology Pattern Recognition and Bioinformatics Group Delft The Netherlands Leiden University Medical Center Pathology Leiden The Netherlands Delft University of Technology Computer Graphics and Visualization Group Delft The Netherlands Leiden University Medical Center Computational Biology Center Leiden The Netherlands Leiden University Medical Center Radiology Leiden The Netherlands

ABSTRACTIntroductionImmune checkpoint blockade has revolutionised cancer treatment. However, clinical outcomes are highly variable as only a proportion of cancer patients benefit from this treatment. To understand the mechanisms that determine responses to current immunotherapies and for the design of alternative approaches, it is crucial to characterise the immune landscape of the tumour microenvironment. An in-depth understanding of anti-tumour immunity requires a comprehensive analysis of the immune cell populations that participate in the process of tumorigenesis. The aim of this study is to unravel local and systemic profiles of lymphoid and myeloid immune subsets in colorectal cancer (CRC) using high-dimensional immunophenotyping by mass cytometry. Material and methodsThe expression of 36 immune cell markers was simultaneously assessed at the single-cell level by mass cytometry in tumour tissues (n=19), tumor-associated lymph nodes (n=17), adjacent normal mucosa (n=4), and peripheral blood samples (n=9) derived from 18 CRC patients. In total, 9 million cells were included in the analysis. Cytosplore and HSNE (Hierarchical Stochastic Neighbour Embedding) analysis tools were used to identify and visualise the composition of the lymphoid and myeloid cell populations of the innate and adaptive immune compartments in the tissues. Results and discussionsWe identified 220 immune cell subsets, including tumor-resident CD8 +CD45RO +CD103 +PD-1 +, CD4 +CD45RO +CD103 +PD-1 + and CD4 +CD45RO +ICOS +CD27 - T cell populations that were not found in tumor-associated lymph nodes, adjacent normal mucosa, and peripheral blood samples of CRC patients. In addition, we identified an overrepresentation of CD3 -CD7 +CD56 +CD45RO +CD127 - intermediate innate lymphoid cells in mismatch-repair deficient cancers and an enrichment of CD14 - myeloid populations in mismatch-repair proficient cancers. Unsupervised clustering of the samples based on the composite immune profile separated the

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Vector-to-closest-point octree for surface ray-casting 20

Vector-to-closest-point octree for surface ray-casting

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20th International Symposium on Vision, Modeling and visualization, VMV 2015

作者： Demir, I. Westermann, R. Computer Graphics and Visualization Group Technische Universitat Munchen Germany

ISBN: (纸本)9783905674958

GPU voxel-based surface ray-casting has positioned as an interesting alternative to rasterization-based rendering approaches, because it allows using many processing units simultaneously, can effectively exploit thread level parallelism, and enables fine-granularity occlusion culling on the pixel level. Yet voxel-based techniques face the problem that an extremely high resolution is necessary to avoid block artifacts at high zoom levels. In this work, we propose a novel improvement of voxel-based ray-casting to overcome this limitation. By using a hierarchical Vector-to-Closest-Point (VCP) representation, we can inherit the advantages of a voxel-based approach at a much smoother approximation of the surface. We demonstrate that, although the VCP grid consumes more memory per cell, it requires less memory overall, because it builds upon a significantly shallower tree hierarchy. In a number of examples we demonstrate the use of our approach for high-quality rendering of high resolution surface models. © 2015 The Eurographics Association.

关键词： Rasterization

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Case study on requirements engineering in information mining project: Metallurgical enterprise 1

Case study on requirements engineering in information mining...

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Joint 1st International Workshop on Knowledge Requirements: Acquisition and Representation, KRAR 2016 and the 1st Regional Consortium for Computing Sciences and Foundation, RCCS 2016

作者： Pollo-Cattaneo, M.F. Pesado, P. Britos, P. García-Martínez, R. PhD Program on Computer Science Computer Science School National University of La Plata Information System Methodologies Research Group Technological National University Buenos Aires Argentina School of Computer Science National University of La Plata Buenos Aires Argentina Information Mining Research Group National. Lab. ID + I in Visualization Computer Graphics and Creative Code University of Rio Negro at El Bolsón Río Negro Argentina Information Systems Research Group National University of Lanus Buenos Aires Argentina

There can be no debate that Information Mining Projects cause processing tools to arise with the sole purpose of converting available organization data into useful knowledge on account of decision-making. Considering the aforementioned, this type of projects demands due diligence in the requirement specification process, as the latter needs to be thorough and traceable throughout the entire project, and therefore, process associated with requirements engineering are not to be reused in any future projects among the like. Similarly, latest methodologies within the field of Information Mining fail to take practices associated to stakeholders and costumers' requirements management into account. With this aim in mind, a solution model to the Information Mining Project Management necessities is proposed. © 2016, CEUR-WS. All rights reserved.

关键词： Requirements engineering

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3D object retrieval with parametric templates 8

3D object retrieval with parametric templates

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8th Eurographics Workshop on 3D Object Retrieval, 3DOR 2015

作者： Getto, Roman Fellner, Dieter W. Interactive Graphics Systems Group TU Darmstadt Germany Fraunhofer IGD Darmstadt Germany Institute of Computer Graphics and Knowledge Visualization TU Graz Austria

ISBN: (纸本)9783905674781

We propose a 3D object retrieval system which uses parametric templates as prior knowledge for the retrieval. A parametric template represents an object-domain and a semantic concept like 'chair' or 'plane' or a more specific concept like 'dining-char' or 'biplane'. The template can be specified at a general or specific level and can even equal actual retrieved objects. The parametric template is composed of several input parameters and an operation chain which constructs an object. Different parameter combinations lead to different object instances. We combine and evaluate a paramteric template with different descriptors. Our results show that the usage of parametric templates can raise the retrieval performance significantly. © The Eurographics Association 2015.

关键词： Semantics

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Modeling human performance of stroke-based text entry 15

Modeling human performance of stroke-based text entry

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17th International Conference on Human-computer Interaction with Mobile Devices and Services, MobileHCI 2015

作者： Burgbacher, Ulrich Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 Münster48149 Germany

ISBN: (纸本)9781450336529

Gesture typing is a popular stroke-based text input method for mobile devices. Instead of tapping, the user enters a word with a single continuous stroke by gesturing through all the letters. In this paper, we introduce a quantitative motor control model to predict the human performance of gesture typing in terms of production times. Based on a model of cursive handwriting, it can be applied to predict the influence of the keyboard layout on gesture typing performance. In contrast to previous approaches, the "chunking" of multiple movements into a single action, which is observed for expert users, is a natural characteristic of the proposed model that avoids overestimation of the production times. Data collected from gesture keyboard users is evaluated to assess the performance of the model in comparison to previous models. © 2015 ACM.

关键词： Character recognition

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Pins 'n' touches: An interface for tagging and editing complex groups 15

Pins 'n' touches: An interface for tagging and editing compl...

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10th ACM International Conference on Interactive Tabletops and Surfaces, ITS 2015

作者： Strothoff, Sven Stuerzlinger, Wolfgang Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Germany School of Interactive Arts + Technology Simon Fraser University Vancouver Canada

ISBN: (纸本)9781450338998

Influenced by mouse/pen-based user interfaces, most touchbased object tagging techniques rely mostly on a single interaction point. Once objects are tagged, typically only individual object inclusions/exclusions are possible. Yet, for tagging larger groups with complex spatial layouts, more refinement may be necessary to achieve the desired result. We apply visual tag markers to objects to visualize their group association. Through a new multi-touch pin gesture that "pins" one or more objects "down" while tagging, our new interface is capable of efficiently grouping objects, as identified in our user studies. © Copyright 2015 ACM.

关键词： User interfaces

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visualization of Biomolecular Structures: State of the Art 17

Visualization of Biomolecular Structures: State of the Art

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17th Eurographics Conference on visualization - State of the Art Reports, EuroVis-STAR 2015

作者： Kozlíková, B. Krone, M. Lindow, N. Falk, M. Baaden, M. Baum, D. Viola, I. Parulek, J. Hege, H.-C. Faculty of Informatics Masaryk University Czech Republic Visualization Research Center University of Stuttgart Germany Department of Visual Data Analysis Zuse Institute Berlin Germany Immersive Visualization Group Linköping University Sweden Laboratoire de Biochimie Théorique UPR 9080 CNRS France Department of Informatics University of Bergen Norway Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)9783905674996

Structural properties of molecules are of primary concern in many fields. This report provides a comprehensive overview on techniques that have been developed in the fields of molecular graphics and visualization with a focus on applications in structural biology. The field heavily relies on computerized geometric and visual representations of three-dimensional, complex, large, and time-varying molecular structures. The report presents a taxonomy that demonstrates which areas of molecular visualization have already been extensively investigated and where the field is currently heading. It discusses visualizations for molecular structures, strategies for efficient display regarding image quality and frame rate, covers different aspects of level of detail, and reviews visualizations illustrating the dynamic aspects of molecular simulation data. The report concludes with an outlook on promising and important research topics to enable further success in advancing the knowledge about interaction of molecular structures. © The Eurographics Association 2015.

关键词： visualization

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DigiTap: An eyes-free VR/AR symbolic input device 14

DigiTap: An eyes-free VR/AR symbolic input device

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20th ACM Symposium on Virtual Reality Software and Technology, VRST 2014

作者： Prätorius, Manuel Valkov, Dimitar Burgbacher, Ulrich Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstraße 62 Münster48143 Germany

ISBN: (纸本)9781450332538

In this paper we present DigiTap-a wrist-worn device specially designed for symbolic input in virtual and augmented reality (VR/AR) environments. DigiTap is able to robustly sense thumb-to-finger taps on the four fingertips and the eight minor knuckles. These taps are detected by an accelerometer, which triggers capturing of an image sequence with a small wrist-mounted camera. The tap position is then extracted with low computational effort from the images by an image processing pipeline. Thus, the device is very energy efficient and may potentially be integrated in a smartwatch-like device, allowing an unobtrusive, always available, eyes-free input. To demonstrate the feasibility of our approach an initial user study with our prototype device was conducted. In this study the suitability of the twelve tapping locations was evaluated, and the most prominent sources of error were identified. Our prototype system was able to correctly classify 92% of the input locations. Copyright © 2014 by the Association for Computing Machinery, Inc (ACM).

关键词： Cameras

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RegistrationShop: An interactive 3d medical volume registration system

RegistrationShop: An interactive 3d medical volume registrat...

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2014 Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2014

作者： Smit, Noeska N. Haneveld, Berend Klein Staring, Marius Eisemann, Elmar Botha, Charl P. Vilanova, Anna Computer Graphics and Visualization group Intelligent Systems TU Delft Netherlands Division of Image Processing Department of Radiology LUMC Netherlands Vxlabs South Africa

ISBN: (纸本)9783905674620

In medical imaging, registration is used to combine images containing information from different modalities or to track treatment effects over time in individual patients. Most registration software packages do not provide an easy-to-use interface that facilitates the use of registration. 2D visualization techniques are often used for visualizing 3D datasets. RegistrationShop was developed to improve and ease the process of volume registration using 3D visualizations and intuitive interactive tools. It supports several basic visualizations of 3D volumetric data. Interactive rigid and non-rigid transformation tools can be used to manipulate the volumes and immediate visual feedback for all rigid transformation tools allows the user to examine the current result in real-time. In this context, we introduce 3D comparative visualization techniques, as well as a way of placing landmarks in 3D volumes. Finally, we evaluated our approach with domain experts, who underlined the potential and usefulness of RegistrationShop. © Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2014. All rights reserved.

关键词： Medical imaging

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