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检索条件"机构=Fraunhofer Institute of Optronics System Technologies and Image Exploitation"

共 592 条记录，以下是51-60 订阅

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Path Planning for the Autonomous Inspection of Voxelized Structures

Path Planning for the Autonomous Inspection of Voxelized Str...

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IEEE International Workshop on Safety, Security, and Rescue Robotics (SSRR)

作者： Raphael Hagmanns Boitumelo Ruf Rabanus Bockmühl Max Weißer Jürgen Beyerer Karlsruhe Institute of Technology (KIT) Germany Fraunhofer Institute of Optronics System Technologies and Image Exploitation Karlsruhe Germany

ISBN: (数字)9798331510954

ISBN: (纸本)9798331510961

We present an infrastructure and model inspection planning approach for known structures in unknown environments. The utilized voxel-based model representations increase the input model flexibility and allow to include environment maps of the surroundings in the planning problem. By simultaneously optimizing both coverage and path length using a GTSP representation, we are able to outperform other state-of-the-art inspection planning routines in both runtime and path length while achieving equivalent coverage.

关键词： Runtime Inspection Path planning Planning Safety Security Robots

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Requirements for 3D Models to be Used in SAR image Simulation

Requirements for 3D Models to be Used in SAR Image Simulatio...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Horst Hammer Silvia Kuny Antje Thiele Fraunhofer Institute of Optronics System Technologies and Image Exploitation IOSB Ettlingen Germany

The simulation of Synthetic Aperture Radar (SAR) images plays an important role for many applications such as Automatic Target Recognition, damage detection or for the in-detail analysis of signatures found in real SAR images. The need for creating synthetic SAR images has increased with the advent of Convolutional Neural Networks (CNNs), since, in contrast to the Electro-Optical domain, only a few very specialized data sets of SAR images exist that could be used for training CNNs. Today, several academic and commercial SAR simulators exist. For all of these, the foundation for the simulation is a 3D model of the scene or object to be simulated. Such 3D models exist in large quantities and can be obtained for virtually any object imaginable. However, these models were not specifically designed for SAR simulation and thus the question arises whether they are suitable for the task. In this paper, several aspects of 3D models are highlighted that should be considered when assessing them for SAR simulation.

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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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Dimension Reduction of Combined image and Elevation Remote Sensing Data Using UMAP, Autoencoders, and Variational Autoencoders: Investigation on Shaded Regions

Dimension Reduction of Combined Image and Elevation Remote S...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Dimitri Bulatov Melanie Böge Denis Debroize Gisela Häufel Kevin Qiu Fraunhofer IOSB Institute of Optronics System Technologies and Image Exploitation Ettlingen Germany

Dimension reduction is a commonplace tool to visualize multi-dimensional data and reparametrize the features to have uniform, metric scales. With a concept of training a Machine Learning method with scarce training data in mind, we wish to investigate to what extent several well-known dimension reducers are suitable to separate very challenging remote sensing data, in particular, in shadow regions. The Potsdam data includes not only plenty of these regions, but also several seldom classes, such as vehicles or clutter. Hence, optical and elevation data as well as some additional features will be used as input for dimension reduction algorithms.

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A Hybrid Unsupervised Learning Strategy for Monitoring Complex Industrial Manufacturing Processes

A Hybrid Unsupervised Learning Strategy for Monitoring Compl...

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Annual Conference of Industrial Electronics Society

作者： Christian W. Frey Fraunhofer Institute of Optronics System Technologies and Image Exploitation IOSB Karlsruhe Germany

Industrial production processes are complex systems that require continuous monitoring to ensure efficiency, product quality, and safety. Anomaly detection is a crucial component of these monitoring systems, with machine learning (ML) methods offering significant advantages over traditional statistical techniques. Clustering-based unsupervised anomaly detection algorithms, such as Self-Organizing Maps (SOMS), are particularly valuable in process monitoring, as they can detect anomalies and identify process phases without requiring labeled training data. However, unsupervised learning methods can be sensitive to the inherent properties of the training data, particularly in cases of strong correlation between features or unbalanced datasets. This paper presents a hybrid unsupervised learning strategy (HULS) for monitoring complex industrial production processes. The proposed method combines existing techniques to address the challenges posed by correlated and unbalanced data. Experimental results from a synthetic dataset demonstrate the effectiveness of the developed hybrid approach.

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Training a CNN with Simulated Data for ATR Lessons Learned 14

Training a CNN with Simulated Data for ATR Lessons Learned

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14th European Conference on Synthetic Aperture Radar, EUSAR 2022

作者： Hammer, Horst Kuny, Silvia Schmitz, Sylvia Thielea, Antje Fraunhofer IOSB Fraunhofer Institute of Optronics System Technologies and Image Exploitation Gutleuthausstr. 1 EttlingenD-76275 Germany KarlsruheD-76128 Germany

ISBN: (纸本)9783800758234

During the last decade, Convolutional Neural Networks (CNNs) have revolutionized many areas of electro-optical (EO) image processing, regularly surpassing traditional methods. This success is strongly connected with the availability of labeled data sets such as imageNet, and the technique of transfer learning. Inspired by this rising interest, the foundations and building blocks of CNNs have been widely extended and many new techniques for optimization, better convergence or better generalization have emerged in very short time. For SAR images, though evolving, the CNN literature is much sparser and it is not entirely clear yet, which techniques from the optical domain also work for SAR images. This paper takes up the example of SAR Automatic Target Recognition (ATR), training with simulated data, and gives an overview of some of the techniques propagated in the EO literature. These were put to the test on SAR ATR on an airborne data set for vehicle classification and evaluated as to their usefulness for this task. © 2022 institute of Electrical and Electronics Engineers Inc.. All rights reserved.

关键词： Synthetic aperture radar

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Wavefront sensor based on angle selectivity of an optical filter 13

Wavefront sensor based on angle selectivity of an optical fi...

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Laser Communication and Propagation through the Atmosphere and Oceans XIII 2024

作者： Zepp, Andreas Branigan, Emma Garnier, Julien Murphy, Kevin Bellossi, Raphael Stein, Karin Gladysz, Szymon Fraunhofer IOSB Ettlingen Fraunhofer Institute of Optronics System Technologies and Image Exploitation Gutleuthausstr. 1 Ettlingen76275 Germany DublinD07 ADY7 Ireland University Paris-Saclay Institut d’Optique Graduate School Palaiseau France

ISBN: (纸本)9781510679542

The effectiveness of free-space laser communications is limited due to wavefront deformations caused by atmospheric optical turbulence. To determine these deformations, we propose a wavefront sensor that utilizes the angular selectivity of an optical transmission filter to measure the first derivative of the wavefront. The transmission filter converts the gradients of the incident wavefront into an intensity distribution. For each direction (x and y) this distribution is captured twice, with different angles between filter and optical axis for each measurement. The contrast of both measurements (calculated for each pixel of the used detector) and the local gradients of the wavefront (averaged across each pixel) has a nearly linear relation. To reconstruct the wavefront from the obtained local gradients, algorithms developed for the Shack-Hartmann wavefront sensor are used. Simulations demonstrate the applicability of the sensor in atmospheric turbulence. For the experimental proof of concept, we have designed and fabricated volume Bragg gratings (VBG) as angular selective filters. The VBGs were implemented in an optical testbed to evaluate the sensor response to wavefront tilts. © 2024 SPIE.

关键词： Adaptive optics

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Investigation of transmission over the sea using a boundary layer scintillometer

Investigation of transmission over the sea using a boundary ...

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Propagation Through and Characterization of Atmospheric and Oceanic Phenomena, pcAOP 2022

作者： Sprung, Detlev Sucher, Erik van Eijk, Alexander M.J. Stein, Karin Fraunhofer IOSB Ettlingen Fraunhofer Institute of Optronics System Technologies and Image Exploitation Gutleuthausstraße 1 Ettlingen76275 Germany TNO DSS The Hague Netherlands

Long-term Boundary Layer Scintillometer (BLS) turbulence measurements were performed over the Baltic Sea and statistics are presented. The BLS was also used as a transmissometer and its performance was compared to a c... 详细信息

ISBN: (纸本)9781557528209

关键词： Boundary layers

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Simulation based design of an UVC-LED emitter for disinfection of high-touch environmental surfaces 11

Simulation based design of an UVC-LED emitter for disinfecti...

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Joint Conference on 11th International Conference on Energy Efficiency in Domestic Appliances and Lighting and 17th International Symposium on the Science and Technology of Lighting, EEDAL/LS:17 2022

作者： Mally, Thorsten Steinhauser, Linda Westerhoff, Thomas Konig, Ulla Fraunhofer Insiute of Optronics System Technologies and Image Exploitation Fraunhofer-Gesellschaft Fraunhofer Iosb IOSB-AST Ilmenau Ilmenau Germany Fraunhofer-Gesellschaft Dresden Germany

ISBN: (纸本)9782492754005

Healthcare-associated infections (HAIs) are a serious problem. Many studies showed that high-touch environmental surfaces can take part in the transmission of HAIs. Helping to reduce these transmissions an UVC-LED emitter is developed, which can be carried by an autonomous robotic platform. It can disinfect environmental surfaces within a clinical environment with UV-C light. The performance of the device was experimentally tested with two pathogens Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis) spores. A 3-5 log reduction can be achieved within 4 s irradiation time. Further investigations are made by simulation typical environmental surfaces. In this study we aim on the disinfection of contamination hotspots like light switches and door handles. On the light switch surface it can reach a dose of almost 400mathrm{J}/ mathrm{m}{2} within 4 s. The door handle is more challenging due to its geometry. To improve the irradiation of the backside a foil of sintered PTFE can be attached to the door surface to increase the reflectivity. With the PTFE attached a 3-4 log reduction can be achieved for E. coli and B. subtilis spores. © 2022 UniversitÃ

关键词： Disinfection

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Integrating Worker Assistance systems and Enterprise Resource Planning in Industry 4.0

Integrating Worker Assistance Systems and Enterprise Resourc...

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Industrial Cyber-Physical systems (ICPS)

作者： Marc Brünninghaus Magnus Redeker Fraunhofer IOSB IOSB-INA Lemgo Fraunhofer Institute of Optronics System Technologies and Image Exploitation

Maximizing the quality and quantity of production output requires the optimization of every single process involved in the production - separately on its own and in combination with other involved processes and assets along the line. Worker assistance systems further optimize otherwise automated production systems by minimizing uncertainties of incorporated manual labor. This paper, subsequent to an elaborate use case and requirements analysis, develops a concept to advance these worker assistance systems from more or less isolated applications, that operate independently from other production and resource management platforms, towards an integrated solution using Industry 4.0-compliant Digital Twins of assistance jobs, products, workers and workstations, that document manually executed processes, their parameters, performances and configurations in an interoperable manner. Consequently, worker assistance systems will be established with little effort as a user- and process-specific enterprise resource planning frontend on the shop floor.

关键词： Industries Production systems Uncertainty Manuals Enterprise resource planning Workstations Fourth Industrial Revolution

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