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17th International Conference on Interfaces and Human Computer Interaction 2023, IHCI 2023, the 17th International Conference on Computer Graphics, Visualization, Computer Vision and image Processing 2023, CGVCVIP 2023 and 16th International Conference on Game and Entertainment technologies 2023, GET 2023

作者： Kannegieser, Ehm Münch, Sarah Ratz, Johannes Fraunhofer Institute of Optronics System Technologies and Image Exploitation Fraunhoferstr.1 Karlsruhe76131 Germany Karlsruhe Institute of Technology Kaiserstraße 12 Karlsruhe76131 Germany

ISBN: (纸本)9789898704498

Deep focus states, like Immersion and Flow are important parameters when it comes to an enjoyable experience during learning activities. Exploring the Physiology of deep focus, in the course of prior studies, physiological data of participants was recorded during activities and inspected for correlations with Flow and Immersion. As no significant correlations were found, the experimental setup was extended by Electroencephalography (EEG) sensors to broaden the sprectrum of physiological data available for analysis, before further studies were conducted. In this paper, after shortly revisiting prior research, the results of the EEG-measurements are presented. © 2023 Proceedings of the International Conferences on Interfaces and Human Computer Interaction 2023, IHCI 2023;Computer Graphics, Visualization, Computer Vision and image Processing 2023, CGVCVIP 2023;and Game and Entertainment technologies 2023, GET 2023. All rights reserved.

关键词： Electroencephalography

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A PROOF OF CONCEPT: CYBERSECURITY LEARNING CONTENT IN LTI BASED, EDUCATIONAL systemS

A PROOF OF CONCEPT: CYBERSECURITY LEARNING CONTENT IN LTI BA...

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International Conference on Applied Computing 2022 and WWW/Internet 2022

作者： Kannegieser, Ehm Dyck, Sergius Atorf, Daniel Fraunhofer Institute of Optronics System Technologies and Image Interpretation IOSB Fraunhoferstr.1 Karlsruhe76131 Germany

ISBN: (纸本)9781713863793

Serious Games are an important part of technology aided learning. Since the learning outcome of intrinsically motivated learners is generally higher, a learning system should support the learner in achieving this state. Serious Games utilize the natural intrinsic motivation of playing a game by incorporating learning objectives. Concepts such as Digital Game Based Learning (DGBL) and Immersive Didactics achieve this by creating a learning environment that feels like an entertainment game by aligning learning and gaming goals. This puts players in a state of peaked intrinsic motivation which allows them to achieve increased levels of learning success - even while enjoying the game itself. Learning content for Serious Games is usually taken from existing courses or other materials. This work in progress explores the implementation of the interoperability standard LTI for integration purposes of third-party learning content into a Serious Game context. Copyright © (2022) by International Association for Development of the Information Society (IADIS). All rights reserved.

关键词： Interoperability

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Simultaneous measurement of surface geometry and film thickness distribution by retroreflex ellipsometry

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Measurement: Sensors 2025年 38卷

作者： Chen, Chia-Wei Hartrumpf, Matthias Längle, Thomas Beyerer, Jürgen Fraunhofer Institute of Optronics System Technologies and Image Exploitation IOSB Karlsruhe Germany Karlsruhe Germany

A holistic approach to determine the surface orientation and film thickness for nonplanar isotropic three-phase systems (ambient-film-substrate) by retroreflex ellipsometry is presented. After scanning the surface of the sample, the ellipsometric parameters (Ψ, Δ), the surface orientation (θ0,) and the film thickness d can be measured simultaneously. Then, the surface geometry can be reconstructed by numerical gradient integration. The influence of the spot size and incident angle on the measurement results is simulated and discussed. The experiments show satisfactory results for film thickness distribution and surface geometry, which prove that the method is capable of measuring nonplanar surfaces. © 2024

关键词： Film thickness

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Statewide Visual Geolocalization in the Wild

arXiv

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arXiv 2024年

作者： Fervers, Florian Bullinger, Sebastian Bodensteiner, Christoph Arens, Michael Stiefelhagen, Rainer Fraunhofer Institute of Optronics System Technologies and Image Exploitation Germany Karlsruhe Institute of Technology Germany

This work presents a method that is able to predict the geolocation of a street-view photo taken in the wild within a state-sized search region by matching against a database of aerial reference imagery. We partition the search region into geographical cells and train a model to map cells and corresponding photos into a joint embedding space that is used to perform retrieval at test time. The model utilizes aerial images for each cell at multiple levels-of-detail to provide sufficient information about the surrounding scene. We propose a novel layout of the search region with consistent cell resolutions that allows scaling to large geographical regions. Experiments demonstrate that the method successfully localizes 60.6% of all non-panoramic street-view photos uploaded to the crowd-sourcing platform Mapillary in the state of Massachusetts to within 50m of their ground-truth location. Source code is available at https://***/fferflo/statewide-visual-geolocalization. Copyright © 2024, The Authors. All rights reserved.

关键词： Aerial photography

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Spatial Augmented Reality in Industrial Environments - An Approach for Improved Hand-Tracking Using Combined Computer Vision technologies

Spatial Augmented Reality in Industrial Environments - An Ap...

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Virtual Reality and 3D User Interfaces Abstracts and Workshops (VRW), IEEE Conference on

作者： Christoph Wächter Sahar Deppe Carsten Röcker Eckelmann FCS AG Herford Germany Fraunhofer Institute of Optronics System Technologies and Image Exploiation Lemgo Germany TH OWL University of Applied Sciences and Arts Lemgo Germany

ISBN: (数字)9798350374490

ISBN: (纸本)9798350374506

Spatial augmented reality is playing an increasingly important role in the design of digital assistance systems for industrial applications. Most of these systems use integrated computer vision technologies for supporting direct interactions in the physical workspace of the user. While these systems work well under lab conditions, field tests in real production environments revealed shortcomings of the underlying computer vision approaches with regard to their reliability. In this paper, we present a concept combing machine learning with the theories of Dempster-Schafer and fuzzy set for improved classification and reliability. For the classification, the Mediapipe-Hand machine learning framework and a segmentation-based method were combined. The fusion with the indices and the classification results is done with fuzzy inference. The subsequent results are merged with Dempster's combination rule. The results proved that the presented concept increases the reliability of the detection up to 97.8 percent.

关键词： Computer vision Visualization Fuzzy sets Three-dimensional displays Spatial augmented reality Machine learning Virtual reality

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Poison-Aware Open-Set Fungi Classification: Reducing the Risk of Poisonous Confusion 25

Poison-Aware Open-Set Fungi Classification: Reducing the Ris...

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25th Working Notes of the Conference and Labs of the Evaluation Forum, CLEF 2024

作者： Wolf, Stefan Thelen, Philipp Beyerer, Jürgen Vision and Fusion Lab Karlsruhe Institute of Technology KIT Vincenz-Prießnitz-Straße 3 Karlsruhe76131 Germany Fraunhofer IOSB Institute of Optronics System Technologies and Image Exploitation Fraunhoferstrasse 1 Karlsruhe76131 Germany Fraunhofer Center for Machine Learning Germany

The FungiCLEF 2024 challenge aims to foster research in the field of application-oriented fine-grained open-set classification. Particularly, it sets the challenge to optimize fungi species classification while recognizing unknown species with the evaluation of multiple metrics targeting the problems of actual use-cases, e.g., the risk of a highly detrimental confusion of a poisonous species for an edible species. To develop a well-performing approach, we focus on reducing this particular risk by introducing multiple improvements. The major improvements are a poisonous reranking which prevents predicting an edible species while a significant chance of the sample being poisonous exists and a genus loss which provides additional training information improving the regularization of the feature space. The advancements provide a large improvement in terms of poisonous confusion but also in terms of overall classification accuracy. With this approach, we achieved the 1st place in the challenge's main metric. Code is available at https://***/stefanwolf/fungi2024. © 2024 Copyright for this paper by its authors.

关键词： Invertebrates

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Sensitivity study on the number of height levels used in a numerical weather model to determine the vertical profile of C2n 6

Sensitivity study on the number of height levels used in a n...

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Environmental Effects on Light Propagation and Adaptive systems VI 2023

作者： Ullwer, Carmen Sprung, Detlev Stein, Karin Van Eijk, A.M.J. Fraunhofer Iosb Ettlingen Fraunhofer Institute of Optronics System Technologies and Image Exploitation Gutleuthausstr. 1 Ettlingen76275 Germany Tno the Hague P.O.Box 96864 The Hague2509 JG Netherlands

ISBN: (纸本)9781510666917

Accurate prediction of the vertical distribution of optical turbulence strength (see manuscript PDF for symbol) is essential for several applications, such as ground-to-satellite optical communications and astronomical seeing prediction. We have developed an algorithm that couples the calculation of (see manuscript PDF for symbol) profiles with the results of the Weather Research and Forecast Model (WRF), using the Tatarskii formula for (see manuscript PDF for symbol). The mixing length scale was identified as a critical parameter along with the gradients of potential temperature and wind speed. To determine the effects of the number of vertical levels used in the simulations and the effects of diurnal variations, we conducted a study using 100 to 500 levels in both daytime and nighttime simulations. We analyzed the results to identify differences and to suggest improvements in the calculations, taking into account the trade-off between longer simulation time and accuracy. We also compared our results to vertical profiles of (see manuscript PDF for symbol) derived from experimental data obtained from radiosonde ascents, for the Bergen radiosonde station in Germany. Our results contribute to refining the modelling of (see manuscript PDF for symbol) and improving the accuracy of the prediction, which will benefit various practical applications. © 2023 SPIE.

关键词： Economic and social effects

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Reduce the Handicap: Performance Estimation for AI systems Safety Certification

Reduce the Handicap: Performance Estimation for AI Systems S...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Julius Pfrommer Matthieu Poyer Saksham Kiroriwal Fraunhofer Institute of Optronics System Technologies and Image Exploitation IOSB Germany

The safety validation of AI and ML-based systems is challenging, as (i) analytical validation needs to include the interaction with a complex and stochastic physical environment and (ii) empirical validation needs to observe very long time-horizons to get enough “statistical signal” for the typically very low safety-related incident rate. This paper proposes an approach that amplifies the empirical evidence by introducing a handicap that reduces the system performance—making safety-related failures empirically more visible in a controlled environment—and gradually removing the handicap so that the convergence to the final incident rate can be estimated. Two numerical case studies are used to support and exemplify the approach.

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A Graph-Theoretic Formulation of Exploratory Blockmodeling∗ 21

A Graph-Theoretic Formulation of Exploratory Blockmodeling∗

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21st International Symposium on Experimental Algorithms, SEA 2023

作者： Bille, Alexander Gröttemeier, Niels Komusiewicz, Christian Morawietz, Nils Fachbereich Mathematik und Informatik Philipps-Universität Marburg Germany System Technologies and Image Exploitation Fraunhofer IOSB Lemgo Fraunhofer Institute of Optronics Germany Institute of Computer Science Friedrich Schiller Universität Jena Germany

ISBN: (纸本)9783959772792

We present a new simple graph-Theoretic formulation of the exploratory blockmodeling problem on undirected and unweighted one-mode networks. Our formulation takes as input the network G and the maximum number t of blocks for the solution model. The task is to find a minimum-size set of edge insertions and deletions that transform the input graph G into a graph G with at most t neighborhood classes. Herein, a neighborhood class is a maximal set of vertices with the same neighborhood. The neighborhood classes of G directly give the blocks and block interactions of the computed blockmodel. We analyze the classic and parameterized complexity of the exploratory blockmodeling problem, provide a branch-And-bound algorithm, an ILP formulation and several heuristics. Finally, we compare our exact algorithms to previous ILP-based approaches and show that the new algorithms are faster for t 4. © 2023 Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing. All rights reserved.

关键词： Clustering algorithms

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Investigation of vertical profiles of the outer scale L0 in the atmospheric surface layer

Investigation of vertical profiles of the outer scale L0 in ...

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2023 Propagation Through and Characterization of Atmospheric and Oceanic Phenomena, pcAOP 2023 in Optica Imaging Congress - Part of Imaging and Applied Optics Congress 2023

作者： Sprung, Detlev Sucher, Erik Van Eijk, Alexander M.J. Fraunhofer IOSB Fraunhofer Institute of Optronics System Technologies and Image Exploitation Ettlingen Gutleuthausstr. 1 Ettlingen76275 Germany TNO the Hague P.O.Box 96864 The Hague2509 JG Netherlands

The height dependency of the outer scale of turbulence in the atmospheric surface layer is investigated using Ultrasonic anemometer measurements. The focus of the analysis was on different atmospheric stability condit... 详细信息

ISBN: (纸本)9781957171289

关键词： Atmospheric turbulence image metrics Near infrared Refractive index Surface layers Wave propagation

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