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46th Annual Conference on European Association for computer graphics, EUROgraphics 2025

作者： Mühlenbrock, Andre Weller, Rene Zachmann, Gabriel Computer Graphics and Virtual Reality Research Lab University of Bremen Germany

ISBN: (纸本)9783038682684

We present TemPCC, an approach to complete temporal occlusions in large dynamic point clouds. Our method manages a point set over time, integrates new observations into this set, and predicts the motion of occluded points based on the flow of surrounding visible ones. Unlike existing methods, our approach efficiently handles arbitrarily large point sets with linear complexity, does not reconstruct a canonical representation, and considers only local features. Our tests, performed on an Nvidia GeForce RTX 4090, demonstrate that our approach can complete a frame with 30,000 points in under 30 ms, while, in general, being able to handle point sets exceeding 1,000,000 points. This scalability enables the mitigation of temporal occlusions across entire scenes captured by multi-RGB-D camera setups. Our initial results demonstrate that self-occlusions are effectively completed and successfully generalized to unknown scenes despite limited training data. © 2025 The Authors.

关键词： Digital cameras

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Visualizing Prediction Correctness of Eye Tracking Classifiers

Visualizing Prediction Correctness of Eye Tracking Classifie...

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2021 ACM Symposium on Eye Tracking research and Applications, ETRA 2021

作者： Prinzler, Martin H.U. Schröder, Christoph Al Zaidawi, Sahar Mahdie Klim Zachmann, Gabriel Maneth, Sebastian Database Lab University of Bremen Germany Computer Graphics and Virtual Reality University of Bremen Germany

ISBN: (纸本)9781450383455

Eye tracking data is often used to train machine learning algorithms for classification tasks. The main indicator of performance for such classifiers is typically their prediction accuracy. However, this number does not reveal any information about the specific intrinsic workings of the classifier. In this paper we introduce novel visualization methods which are able to provide such information. We introduce the Prediction Correctness Value (PCV). It is the difference between the calculated probability for the correct class and the maximum calculated probability for any other class. Based on the PCV we present two visualizations: (1) coloring segments of eye tracking trajectories according to their PCV, thus indicating how beneficial certain parts are towards correct classification, and (2) overlaying similar information for all participants to produce a heatmap that indicates at which places fixations are particularly beneficial towards correct classification. Using these new visualizations we compare the performance of two classifiers (RF and RBFN). © 2021 ACM.

关键词： Visualization

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Dynamic ocean inverse modeling based on differentiable rendering

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Computational Visual Media 2024年第2期10卷 279-294页

作者： Xueguang Xie Yang Gao Fei Hou Aimin Hao Hong Qin State Key Lab of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Qingdao Research Institute Beihang UniversityQingdao 266100Chinaand Peng Cheng LabShenzhen 518000China SKLCS Institute of SoftwareChinese Academy of SciencesBeijing 100190Chinaand University of Chinese Academy of SciencesBeijing 100049China Department of Computer Science Stony Brook University(SUNY at Stony Brook)Stony BrookNew York 11794-2424USA

Learning and inferring underlying motion patterns of captured 2D scenes and then re-creating dynamic evolution consistent with the real-world natural phenomena have high appeal for graphics and *** bridge the technical gap between virtual and real environments,we focus on the inverse modeling and reconstruction of visually consistent and property-verifiable oceans,taking advantage of deep learning and differentiable physics to learn geometry and constitute waves in a self-supervised ***,we infer hierarchical geometry using two networks,which are optimized via the differentiable *** extract wave components from the sequence of inferred geometry through a network equipped with a differentiable ocean ***,ocean dynamics can be evolved using the reconstructed wave *** extensive experiments,we verify that our new method yields satisfactory results for both geometry reconstruction and wave ***,the new framework has the inverse modeling potential to facilitate a host of graphics applications,such as the rapid production of physically accurate scene animation and editing guided by real ocean scenes.

关键词： inverse modeling surface reconstruction wave modeling ocean waves differentiable rendering(DR)

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Versatile Immersive virtual and Augmented Tangible OR - Using VR, AR and Tangibles to Support Surgical Practice

Versatile Immersive Virtual and Augmented Tangible OR - Usin...

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Extended Abstracts of the 2023 CHI Conference on Human Factors in Computing Systems, CHI EA 2023

作者： Reinschluessel, Anke Verena Muender, Thomas Fischer, Roland Kraft, Valentin Uslar, Verena Nicole Weyhe, Dirk Schenk, Andrea Zachmann, Gabriel Döring, Tanja Malaka, Rainer Digital Media Lab University of Bremen Bremen Germany Computer Graphics and Virtual Reality Research Lab University of Bremen Bremen Germany Fraunhofer Institute for Digital Medicine Mevis Bremen Germany University Hospital for Visceral Surgery Carl von Ossietzky University of Oldenburg PIUS-Hospital Oldenburg Germany University of Bremen Digital Media Lab & Tzi Bremen Germany

ISBN: (纸本)9781450394222

Immersive technologies such as virtual reality (VR) and augmented reality (AR), in combination with advanced image segmentation and visualization, have considerable potential to improve and support a surgeon's work. We demonstrate a solution to help surgeons plan and perform surgeries and educate future medical staff using VR, AR, and tangibles. A VR planning tool improves spatial understanding of an individual's anatomy, a tangible organ model allows for intuitive interaction, and AR gives contactless access to medical images in the operating room. Additionally, we present improvements regarding point cloud representations to provide detailed visual information to a remote expert and about the remote expert. Therefore, we give an exemplary setup showing how recent interaction techniques and modalities benefit an area that can positively change the life of patients. © 2023 Owner/Author.

关键词： Augmented reality

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VibraForge: A Scalable Prototyping Toolkit for Creating Spatialized Vibrotactile Feedback Systems 25

VibraForge: A Scalable Prototyping Toolkit for Creating Spat...

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2025 CHI Conference on Human Factors in Computing Systems, CHI 2025

作者： Huang, Bingjian Ren, Siyi Luo, Yuewen Cheng, Qilong Cai, Hanfeng Sang, Yeqi Sousa, Mauricio Dietz, Paul H Wigdor, Daniel Dynamic Graphics Project Lab University of Toronto TorontoON Canada Division of Engineering Science University of Toronto TorontoON Canada Mechanical Engineering University of Toronto TorontoON Canada Department of Electrical and Computer Engineering University of Toronto TorontoON Canada Department of Mechanical & Industrial Engineering University of Toronto TorontoON Canada Reality Labs Research at Meta TorontoON Canada DGP The University of Toronto TorontoON Canada Department of Computer Science University of Toronto TorontoON Canada

ISBN: (纸本)9798400713941

Spatialized vibrotactile feedback systems deliver tactile information by placing multiple vibrotactile actuators on the body. As increasing numbers of actuators are required to adequately convey information in complicated applications, haptic designers find it difficult to create such systems due to limited scalability of existing toolkits. We propose VibraForge, an open-source vibrotactile toolkit that supports up to 128 vibrotactile actuators. Each actuator is encapsulated within a self-contained vibration unit and driven by its own microcontroller. By leveraging a chain-connection method, each unit receives independent vibration commands from a control unit, with fine-grained control over intensity and frequency. We also designed a GUI Editor to expedite the authoring of spatial vibrotactile patterns. Technical evaluation showed that vibration units reliably reproduced audio waveforms with low-latency and high-bandwidth data communication. Case studies of a phonemic tactile display, virtual reality fitness training, and drone teleoperation demonstrated the potential usage of VibraForge within different domains. A usability study with non-expert users highlighted the low technical barrier and customizability of the toolkit. © 2025 Copyright held by the owner/author(s). Publication rights licensed to ACM.

关键词： Feedback control

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Simulating the Dilution of Sulfuric Acid on Mixed reality Platform 8

Simulating the Dilution of Sulfuric Acid on Mixed Reality Pl...

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8th International Conference on virtual reality, ICVR 2022

作者： Pan, Zhipeng Miao, Jinda Cai, Ning Luo, Tianren Zhang, Mingmin Pan, Zhigeng Research Institute of Virtual Reality and Intelligent Systems Hangzhou Normal University Hangzhou China Zhejiang University College of Computer Science and Technology Hangzhou China Institute of Software Chinese Academy of Sciences State Key Laboratory of Computer Science and Beijing Key Lab of Human-Computer Interaction Beijing China Nanjing University of Information Science and Technology School of Artificial Intelligence Nanjing China

ISBN: (数字)9781665479110

ISBN: (纸本)9781665479110

Augmented reality technology has been widely used in experimental education. Augmented reality provides virtual-real integration, real-Time interaction and three-dimensional immersion, which provides a new development direction for simulating the teaching environment and promoting learning interaction. We have developed an MR experiment of diluting concentrated sulfuric acid, which helps students learn experimental manipulations and scientific concepts before conducting real chemical experiments. virtual experiments can avoid the risks of real chemical experiments and reduce the waste of chemical materials. At the same time, we correctly render the occlusion relationship between the hand, the beaker and the virtual liquid, providing a realistic experimental effect. The tracking of multiple cameras allows students to interact more naturally. We compared the availability and students' attitudes of three virtual experiments about diluting concentrated sulfuric acid. The results show that the usability of the MR experimental system reaches the level of user satisfaction. The realistic visual effects and natural interaction method of the MR experiment have been recognized by the students. © 2022 IEEE.

关键词： Students

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An Effective Two-stage Training Paradigm Detector for Small Dataset

arXiv

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arXiv 2023年

作者： Wang, Zheng Xie, Dong Wang, Hanzhi Tian, Jiang AI Lab Lenovo Research Beijing China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Department of Computer Science Yale University New HavenCT United States

Learning from the limited amount of labeled data to the pre-train model has always been viewed as a challenging task. In this report, an effective and robust solution, the two-stage training paradigm YOLOv8 detector (TP-YOLOv8), is designed for the object detection track in VIPriors Challenge 2023. First, the backbone of YOLOv8 is pre-trained as the encoder using the masked image modeling technique. Then the detector is fine-tuned with elaborate augmentations. During the test stage, test-time augmentation (TTA) is used to enhance each model, and weighted box fusion (WBF) is implemented to further boost the performance. With the well-designed structure, our approach has achieved 30.4% average precision from 0.50 to 0.95 on the DelftBikes test set, ranking 4th on the leaderboard. © 2023, CC BY.

关键词： Object detection

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MultiAR: A Multi-User Augmented reality Platform for Biomedical Education

MultiAR: A Multi-User Augmented Reality Platform for Biomedi...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Markus Perz Gijs Luijten Jens Kleesiek Dieter Schmalstieg Jan Egger Christina Gsaxner Institute of Computer Graphics and Vision Graz University of Technology Graz Austria Institute for Artificial Intelligence in Medicine University Medicine Essen Essen Germany Cancer Research Center Cologne Essen West German Cancer Center Essen Germany Institute for Visualization and Interactive Systems University of Stuttgart Stuttgart Germany Virtual and Extended Reality in Medicine (ZvRM) University Hospital Essen Essen Germany

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

This paper addresses the growing integration of Augmented reality (AR) in biomedical sciences, emphasizing collaborative learning experiences. We present MultiAR, a versatile, domain-specific platform enabling multi-user interactions in AR for biomedical education. Unlike platform-specific solutions, MultiAR supports various AR devices, including handheld and head-mounted options. The framework extends across domains, augmenting biomedical education applications with collaborative capabilities. We define essential requirements for a multi-user AR framework in education, detail MultiAR’s design and implementation, and comprehensively evaluate it using anatomy education examples. Quantitative and qualitative analyses, covering system performance, accuracy metrics, and a user study with 20 participants, highlight the urgent need for a tailored collaborative AR platform in biomedical education. Results underscore enthusiasm for collaborative AR technology, endorsing MultiAR as an accessible, versatile solution for developers and end-users in biomedical education.

关键词： Measurement Accuracy Federated learning System performance Education Collaboration Anatomy Engineering in medicine and biology Augmented reality

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POS0562 Evaluation of Small bowel Involvement in Systemic Sclerosis Using Morpho-Functional Image Analysis Assisted by Artificial Intelligence

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Annals of the Rheumatic Diseases 2025年 84卷 764-765页

作者： L.G. Alcala-gonzalez L. Hui P. Gilabert A. Guillen-Del-Castillo A. Aguilar C. Barber C. Codina L. Triginer J. Serra E. Monclus S. Segui C.P. Simeón-Aznar C. Malagelada Digestive System Research Unit Department of Digestive Diseases Vall d'Hebron University Hospital Barcelona Spain Visualization Virtual Reality and Graphics Interaction Research Group UPC-BarcelonaTech Barcelona Spain Department of Mathematics and Computer Science Universitat de Barcelona Barcelona Spain Systemic Autoimmune Diseases Unit Internal Medicine Department Vall d'Hebron University Hospital Barcelona Spain Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd) Barcelona Spain Universitat Autonoma de Barcelona Department of Medicine Barcelona Spain

Background: In systemic sclerosis (SSc), the symptoms and signs of small bowel involvement encompass a broad clinical spectrum, ranging from non-specific symptoms such as abdominal pain, distension, nausea, or vomiting to complications such as small intestinal bacterial overgrowth and, in severe cases, intestinal pseudo-obstruction. Currently, manometry is the gold-standard test for small bowel motility evaluation. However, this test is invasive and only available at specialized centers. In recent years, our laboratory has focused on developing innovative non-invasive technologies to evaluate small bowel motor function, focusing on computerized analysis of images obtained by abdominal CT and capsule endoscopy. Objectives: The aim of this pilot study was to evaluate intestinal motor function in patients with SSc using novel imaging technologies and to compare the results with the gold-standard manometry evaluation. Methods: Prospective study including consecutive patients with SSc and digestive symptoms between June 2021 and June 2024. On separate days, small bowel motility was assessed by high-resolution jejunal manometry, intraluminal images of the small bowel were obtained by capsule endoscopy, and external images by abdominal CT. Jejunal manometry was performed using a 35-channel high-resolution catheter for 5h (3h fasting and 2h postprandial). Tracings were analyzed according to established criteria for small bowel dysmotility and categorized as neuropathic (abnormal contractile activity with preserved amplitude), myopathic (decreased amplitude over the whole tracing), or apparently normal motility. Endoluminal image analysis of capsule endoscopy images was performed using a computer vision program specifically designed to detect contractile patterns (phasic luminal closure and radial wrinkles), non-contractile patterns (tunnel appearance) and turbid-static intestinal content (using color decomposition analysis) (Figure 1A). Morpho-volumetric analysis of CT scan

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FluidPlaying: Efficient Adaptive Simulation for Highly Dynamic Fluid

FluidPlaying: Efficient Adaptive Simulation for Highly Dynam...

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virtual reality and 3D User Interfaces Abstracts and Workshops (VRW), IEEE Conference on

作者： Sinuo Liu Xiaojuan Ban Sheng Li Haokai Zeng Xiaokun Wang Yanrui Xu Fei Zhu Guoping Wang Graphics & Interaction Lab National Biomedical Imaging Center School of Computer Science Peking University School of Intelligence Science and Technology University of Science and Technology Beijing Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

We present FliudPlaying, a novel dynamic level-based spatially adaptive simulation method that can handle highly dynamic fluid efficiently. To capture the subtle detail of the fluid surface, the high-resolution simulation is performed not only at the free surface but also at those regions with high vorticity levels and velocity difference levels. To minimize the density error, an online optimization scheme is used when increasing the resolution by particle splitting. We also proposed a neighbor-based splash enhancement to compensate for the loss of dynamic details. Compared with the high-resolution simulation baseline, our method can achieve over 3× speedups while consuming only less than 10% computational resources. Furthermore, our method can make up for the loss of high-frequency details caused by the spatial adaptation, and provide more realistic dynamics in particle-based fluid simulation.

关键词： Solid modeling Adaptation models Three-dimensional displays Fluid dynamics Computational modeling Conferences virtual reality

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