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Digital backpacking in the museum with a smartcard 06

Digital backpacking in the museum with a smartcard

CHINZ 2006: 7th International Conference NZ Chapter of the ACM's Special Interest Group on Human-computer Interaction(SIGCHI-NZ)

作者： Hornecker, Eva Stifter, Matthias HIT Lab. NZ University of Canterbury Private Bag 4800 Christchurch 8004 New Zealand Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstr. 9-11 A-1040 Vienna Austria

ISBN: (纸本)1595934731

This paper reports on the evaluation of a digitally-augmented exhibition on the history of modern media and our experiences with the methodic approach employed. As a central element of this exhibition visitors can buy a smartcard that enables them to store collected or self-created data in a 'digital backpack', which can be accessed via internet as a personalized souvenir. We have evaluated the exhibition, visitors' perceptions and usage of the card using a multi-method strategy complementing quantitative data-analysis with qualitative, ethnographic methods. This paper focuses on visitors' use and the perceived utility of the smartcard, and our experiences with using automatically generated data from interaction logfiles for analyzing visitor behavior, and with the multi-method strategy. Copyright 2006 ACM.

关键词： Human computer interaction

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Evolutionary computation: An overview and recent trends

OGAI Journal (Oesterreichische Gesellschaft fuer Artificial ...

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OGAI Journal (Oesterreichische Gesellschaft fuer Artificial Intelligence) 2005年第2期24卷 2-7页

作者： Raidl, Gunther Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstraße 9-11/1861 1040 Vienna Austria

No abstract available

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Application-Oriented Extensions of Profile Flags

Application-Oriented Extensions of Profile Flags

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8th Joint Eurographics/IEEE VGTC Symposium on Visualization, EuroVis 2006

作者： Mlejnek, Matej Ermes, Pierre Vilanova, Anna van der Rijt, Rob van den Bosch, Harrie Gerritsen, Frans Gröller, M. Eduard Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Philips Medical Systems Best Netherlands Department of Biomedical Engineering Technische Universiteit Eindhoven Netherlands Catharina Hospital Eindhoven Netherlands

ISBN: (纸本)3905673312

This paper discusses two applications of probing dense volumetric data for MR orthopedics and dynamic contrast enhanced MRI mammography. In order not to reduce the context information and to extract the essential part of the data, we apply Profile Flags. A Profile Flag is a 3D glyph for probing and annotating the volumetric data. The first application area deals with visualization of T2 profiles for interactive inspection of knee cartilage and detection of lesions. In the second application, we present the usability the Profile Flags for measuring of time-signal profiles for a set of time-dependent MR volumes. Several extensions of the basic Profile Flag concept are described in detail and discussed. These extensions include selection of a set of profiles based on spatial as well as curve differences, automatic positioning of the Profile Flags, and adaptation for probing of time-varying volumetric data. Additionally, we include the evaluation of the used methods by our medical partners. © The Eurographics Association 2006.

关键词： Dynamic contrast enhanced MRI

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Semantics by analogy for illustrative volume visualization

Semantics by analogy for illustrative volume visualization

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作者： Gerl, Moritz Rautek, Peter Isenberg, Tobias Gröller, Eduard Institute of Mathematics and Computing Science University of Groningen SVCG P.O. Box 407 9700 AK Groningen Netherlands DIGITEO LIMSI-CNRS AVIZ-INRIA Orsay France Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

We present an interactive graphical approach for the explicit specification of semantics for volume visualization. This explicit and graphical specification of semantics for volumetric features allows us to visually assign meaning to both input and output parameters of the visualization mapping. This is in contrast to the implicit way of specifying semantics using transfer functions. In particular, we demonstrate how to realize a dynamic specification of semantics which allows to flexibly explore a wide range of mappings. Our approach is based on three concepts. First, we use semantic shader augmentation to automatically add rule-based rendering functionality to static visualization mappings in a shader program, while preserving the visual abstraction that the initial shader encodes. With this technique we extend recent developments that define a mapping between data attributes and visual attributes with rules, which are evaluated using fuzzy logic. Second, we let users define the semantics by analogy through brushing on renderings of the data attributes of interest. Third, the rules are specified graphically in an interface that provides visual clues for potential modifications. Together, the presented methods offer a high degree of freedom in the specification and exploration of rule-based mappings and avoid the limitations of a linguistic rule formulation. © 2011 Elsevier Ltd.

关键词： Semantics

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Design and Development of a Web-based Tool for Inpainting of Dissected Aortae in Angiography Images

arXiv

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arXiv 2020年

作者： Prutsch, Alexander Pepe, Antonio Egger, Jan Institute of Computer Graphics and Vision Graz University of Technology Graz Austria Computer Algorithms for Medicine Lab Graz Austria

Medical imaging is an important tool for the diagnosis and the evaluation of an aortic dissection (AD);a serious condition of the aorta, which could lead to a life-threatening aortic rupture. AD patients need life-long medical monitoring of the aortic enlargement and of the disease progression, subsequent to the diagnosis of the aortic dissection. Since there is a lack of healthy-dissected image pairs from medical studies, the application of inpainting techniques offers an alternative source for generating them by doing a virtual regression from dissected aortae to healthy aortae;an indirect way to study the origin of the disease. The proposed inpainting tool combines a neural network, which was trained on the task of inpainting aortic dissections, with an easy-to-use user interface. To achieve this goal, the inpainting tool has been integrated within the 3D medical image viewer of StudierFenster (***). By designing the tool as a web application, we simplify the usage of the neural network and reduce the initial learning curve. Copyright © 2020, The Authors. All rights reserved.

关键词： Blood vessels

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Weight-biased edge-crossover in evolutionary algorithms for two graph problems 01

Weight-biased edge-crossover in evolutionary algorithms for ...

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2001 ACM Symposium on Applied Computing, SAC 2001

作者： Julstrom, Bryant A. Raidl, Günther R. Department of Computer Science St. Cloud State University 720 Fourth Avenue South St. CloudMN56301 United States Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstraße 9-11/1861 Vienna1040 Austria

ISBN: (纸本)1581132875

Many optimization problems on weighted graphs seek a subset of the graph's edges that has minimum weight and satisfies the problem's constraints. Two examples are the traveling salesman problem (TSP) and the degree-constrained minimum spanning tree problem (d-MSTP). Heuristics like evolutionary algorithms often construct candidate solutions to such problems iteratively, repeatedly including an edge selected from those currently eligible. Not surprisingly, low-weight edges usually predominate in good and optimal solutions, an observation we confirm empirically for the TSP and the d-MSTP. This suggests that any process that builds candidate solutions should, with higher probability, select edges of lower weight. We incorporate into crossover operators and compare in a genetic algorithm four edge-selection techniques: random, greedy, according to probabilities inversely proportional to the edges' weights, and 2-tournament. Tests on instances of the TSP and the d-MSTP indicate that with the weight-biased techniques, the GA identifies better solutions faster than with random edge-selection. © 2001 ACM.

关键词： Traveling salesman problem

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A client/server based online environment for manual segmentation of medical images

arXiv

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arXiv 2019年

作者： Wild, Daniel Weber, Maximilian Egger, Jan Institute of Computer Graphics and Vision Graz University of Technology Graz Austria Computer Algorithms for Medicine Lab Graz Austria

Segmentation is a key step in analyzing and processing medical images. Due to the low fault tolerance in medical imaging, manual segmentation remains the de facto standard in this domain. Besides, efforts to automate the segmentation process often rely on large amounts of manually labeled data. While existing software supporting manual segmentation is rich in features and delivers accurate results, the necessary time to set it up and get comfortable using it can pose a hurdle for the collection of large datasets. This work introduces a client/server based online environment, referred to as Studierfenster, that can be used to perform manual segmentations directly in a web browser. The aim of providing this functionality in the form of a web application is to ease the collection of ground truth segmentation datasets. Providing a tool that is quickly accessible and usable on a broad range of devices, offers the potential to accelerate this process. The manual segmentation workflow of Studierfenster consists of dragging and dropping the input file into the browser window and sliceby- slice outlining the object under consideration. The final segmentation can then be exported as a file storing its contours and as a binary segmentation mask. In order to evaluate the usability of Studierfenster, a user study was performed. The user study resulted in a mean of 6.3 out of 7.0 possible points given by users, when asked about their overall impression of the tool. The evaluation also provides insights into the results achievable with the tool in practice, by presenting two ground truth segmentations performed by physicians. Copyright © 2019, The Authors. All rights reserved.

关键词： Large dataset

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Depth-Awareness in a System for Mixed-Reality Aided Surgical Procedures 15th

Depth-Awareness in a System for Mixed-Reality Aided Surgical...

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15th International Conference on Intelligent Computing, ICIC 2019

作者： Sylos Labini, Mauro Gsaxner, Christina Pepe, Antonio Wallner, Juergen Egger, Jan Bevilacqua, Vitoantonio Institute for Computer Graphics and Vision Faculty of Computer Science and Biomedical Engineering Graz University of Technology Graz Austria Computer Algorithms for Medicine Laboratory Graz Austria Department of Electrical and Information Engineering Polytechnic University of Bari Bari Italy Department of Oral and Maxillofacial Surgery Medical University of Graz Graz Austria

ISBN: (纸本)9783030267650

computer-assisted surgery is a trending topic in research, with many different approaches which aim at supporting surgeons in the operating room. Existing surgical planning and navigation solutions are often considered to be distracting, unintuitive or hard to interpret. In this work, we address this issue with an approach based on mixed reality devices like Microsoft HoloLens. We assess the depth sensing capabilities of Microsoft HoloLens, and the potential benefit they could bring to computer-assisted surgery applications. © 2019, Springer Nature Switzerland AG.

关键词： Mixed reality

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Feature Emphasis and Contextual Cutaways for Multimodal Medical Visualization

Feature Emphasis and Contextual Cutaways for Multimodal Medi...

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9th Joint Eurographics/IEEE VGTC Symposium on Visualization, EuroVis 2007

作者： Burns, Michael Haidacher, Martin Wein, Wolfgang Viola, Ivan Gröller, M. Eduard Imaging and Visualization Department Siemens Corporate Research PrincetonNJ United States Computer Science Department Princeton University United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Department of Informatics University of Bergen Norway

ISBN: (纸本)9783905673456

Dense clinical data like 3D Computed Tomography (CT) scans can be visualized together with real-time imaging for a number of medical intervention applications. However, it is difficult to provide a fused visualization that allows sufficient spatial perception of the anatomy of interest, as derived from the rich pre-operative scan, while not occluding the real-time image displayed embedded within the volume. We propose an importance-driven approach that presents the embedded data such that it is clearly visible along with its spatial relation to the surrounding volumetric material. To support this, we present and integrate novel techniques for importance specification, feature emphasis, and contextual cutaway generation. We show results in a clinical context where a pre-operative CT scan is visualized alongside a tracked ultrasound image, such that the important vasculature is depicted between the viewpoint and the ultrasound image, while a more opaque representation of the anatomy is exposed in the surrounding area. © The Eurographics Association 2007.

关键词： Visualization

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Towards a harmonic complexity of musical pieces 14

Towards a harmonic complexity of musical pieces

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14th Annual Workshop on DAtabases, TExts, Specifications and Objects, DATESO 2014

作者： Maršík, Ladislav Pokorný, Jaroslav Ilčík, Martin Dept. of Software Engineering Faculty of Mathematics and Physics Charles University Malostranské nám. 25 Prague Czech Republic Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstraße 9-11 Vienna Austria

ISBN: (纸本)9788001054826

Music information retrieval (MIR) is small, but fast growing discipline. It aims at extraction of relevant information from music in order to improve the work with multimedia information systems. A popular approach in MIR is to apply signal processing techniques to extract low-level features from a musical piece. However, in order to create helpful applications, high-level concepts, such as music harmony, need to be examined as well. In this paper, we present a new model for understanding music harmony in computer systems. The proposed model takes the challenge of filling the gap between music theory and mathematical structures. Inspired by the computational complexity, we then derive a new term, harmonic complexity, that can be evaluated for a musical piece, and we test it on a genre classification problem.

关键词： Harmonic analysis

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