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Item Algorithmic Improvements on Hilbert and Moore Treemaps for Visualization of Large Tree-structured Datasets(The Eurographics Association, 2021) Scheibel, Willy; Weyand, Christopher; Bethge, Joseph; Döllner, Jürgen; Agus, Marco and Garth, Christoph and Kerren, AndreasHilbert and Moore treemaps are based on the same named space-filling curves to lay out tree-structured data for visualization. One main component of them is a partitioning subroutine, whose algorithmic complexity poses problems when scaling to industry-sized datasets. Further, the subroutine allows for different optimization criteria that result in different layout decisions. This paper proposes conceptual and algorithmic improvements to this partitioning subroutine. Two measures for the quality of partitioning are proposed, resulting in the min-max and min-variance optimization tasks. For both tasks, linear-time algorithms are presented that find an optimal solution. The implementation variants are evaluated with respect to layout metrics and run-time performance against a previously available greedy approach. The results show significantly improved run time and no deterioration in layout metrics, suggesting effective use of Hilbert and Moore treemaps for datasets with millions of nodes.Item A context-aware immersive interface for teleoperation of mobile robots(The Eurographics Association, 2020) Quintas, João; Almeida, Luís; Sousa, Elísio; Menezes, Paulo; Dias, Paulo and Menezes, PauloIn this paper we present a context-aware immersive teleoperation interface to assist operators during navigation tasks. This new interface strategy aims to address the problems associated with mental overload, often experienced by operators of teleoperated devices. Our approach simplifies the high complexity of information displayed in control rooms. Our approach includes a context-based human-robot interaction framework that detects relevant information and automatically adapts the displayed interface in virtual windshield. Results showed that the proposed approach enhances user immersion while maximizes task performances and minimizes the operator physical and cognitive workload.Item On the Beat: Analysing and Evaluating Synchronicity in Dance Performances(The Eurographics Association, 2023) Menzel, Malte; Tauscher, Jan-Philipp; Magnor, Marcus; Guthe, Michael; Grosch, ThorstenThis paper presents a method to analyse and evaluate synchronicity in dance performances automatically. Synchronisation of a dancer's movement and the accompanying music is a vital characteristic of dance performances. We propose a method that fuses computer vision-based extraction of dancers' body pose information and audio beat tracking to examine the alignment of the dance motions with the background music. Specifically, the motion of the dancer is analysed for rhythmic dance movements that are then subsequently correlated to the musical beats of the soundtrack played during the performance. Using a single mobile phone video recording of a dance performance only, our system is easily usable in dance rehearsal contexts. Our method evaluates accuracy for every motion beat of the performance on a timeline giving users detailed insight into their performance. We evaluated the accuracy of our method using a dataset containing 17 video recordings of real world dance performances. Our results closely match assessments by professional dancers, indicating correct analysis by our method.Item Interactions for Seamlessly Coupled Exploration of High-Dimensional Images and Hierarchical Embeddings(The Eurographics Association, 2023) Vieth, Alexander; Lelieveldt, Boudewijn; Eisemann, Elmar; Vilanova, Anna; Höllt, Thomas; Guthe, Michael; Grosch, ThorstenHigh-dimensional images (i.e., with many attributes per pixel) are commonly acquired in many domains, such as geosciences or systems biology. The spatial and attribute information of such data are typically explored separately, e.g., by using coordinated views of an image representation and a low-dimensional embedding of the high-dimensional attribute data. Facing ever growing image data sets, hierarchical dimensionality reduction techniques lend themselves to overcome scalability issues. However, current embedding methods do not provide suitable interactions to reflect image space exploration. Specifically, it is not possible to adjust the level of detail in the embedding hierarchy to reflect changing level of detail in image space stemming from navigation such as zooming and panning. In this paper, we propose such a mapping from image navigation interactions to embedding space adjustments. We show how our mapping applies the "overview first, details-on-demand" characteristic inherent to image exploration in the high-dimensional attribute space. We compare our strategy with regular hierarchical embedding technique interactions and demonstrate the advantages of linking image and embedding interactions through a representative use case.Item Towards Closing the Gap of Medical Visualization Research and Clinical Daily Routine(The Eurographics Association, 2020) Maack, Robin Georg Claus; Saur, Dorothee; Hagen, Hans; Scheuermann, Gerik; Gillman, Christina; Gillmann, Christina and Krone, Michael and Reina, Guido and Wischgoll, ThomasMedical visualization papers are constantly published throughout the last years, but many never make their way into clinical daily routine. In this manuscript we aim to examine the gap between visualization research and clinical daily routine and suggest a mechanism that can lead towards closing this gap. We first identify the actors involved in developing new medical visualization approaches and their different views in this process. Then we develop a software development process unifying all actors and their needs. In addition, we collect further barriers in the medical software development process.Item A Rapid VR House Interior Generator with Eye-tracking Feedback for Home Staging(The Eurographics Association, 2023) Miyakawa, Takuya; Bland, Jeffrey Keith Spaneas; Yoshikawa, Gaku; Ma, Yuan; Abey Campbell; Claudia Krogmeier; Gareth YoungThe employment of virtual reality (VR) technology in home staging (i.e., showcasing layout and interior design to influence potential homebuyers' purchases) has noticeable limitations. First, developing VR models by game engines may bring unaffordable workloads for real estate agencies. Second, pen-and-paper feedback on a VR model of the staged home is sometimes ambiguous and misleading. We developed an application that combines a virtual tour platform and a VR-based eye-tracker to address the two issues. The current work investigated the relationship between subjects' preferences and eye movements in a staged home. Our results support that subjects' eye-tracking data on layout and interior design differs following their preference change, reflecting the potential of eye-tracking in evaluating staged home models. In the future, we will examine the workload reduction in creating a VR model via the virtual tour platform.Item Interactive Deformable Image Registration with Dual Cursor(The Eurographics Association, 2022) Igarashi, Takeo; Koike, Tsukasa; Kin, Taichi; Yang, Yin; Parakkat, Amal D.; Deng, Bailin; Noh, Seung-TakDeformable image registration is the process of deforming a target image to match corresponding features of a reference image. Fully automatic registration remains difficult; thus, manual registration is dominant in practice. In manual registration, an expert user specifies a set of paired landmarks on the two images; subsequently, the system deforms the target image to match each landmark with its counterpart as a batch process. However, the deformation results are difficult for the user to predict, and moving the cursor back and forth between the two images is time-consuming. To improve the efficiency of this manual process, we propose an interactive method wherein the deformation results are continuously displayed as the user clicks and drags each landmark. Additionally, the system displays two cursors, one on the target image and the other on the reference image, to reduce the amount of mouse movement required. The results of a user study reveal that the proposed interactive method achieves higher accuracy and faster task completion compared to traditional batch landmark placement.Item Study of Alleviating the Symptoms of VR Sickness by Cooling Skin Surface(The Eurographics Association, 2023) Kawamura, Taiki; Sakata, Nobuchika; Abey Campbell; Claudia Krogmeier; Gareth YoungVR sickness with symptoms like motion sickness such as carsick may occur when using VR. The occurrence of VR sickness varies from person to person, and the intensity and symptoms of sickness vary. However, in case of the VR sickness once occurs, it interferes with VR activities. Therefore, the elimination or alleviation of VR sickness is necessary for comfortable VR activities. In this study, we propose a method of cooling the neck and temples of the skin surface to alleviate the symptoms of VR sickness when VR sickness occurs. The experimental results show that skin surface cooling is effective in suppressing the symptoms of VR sickness when it occurs.Item A Visual Approach to Pseudo Unseen Presence in the Metaverse Using HMD(The Eurographics Association, 2023) Funahashi, Kenji; Matsunoo, Yuzuki; Abey Campbell; Claudia Krogmeier; Gareth YoungYou may sometimes sense an unseen-presence when someone is behind you. We propose a novel method to show pseudopresence through visual perception using only a standard HMD. This goal is not to promote a clear perception of the five senses, but rather to somehow subconsciously perceive a sense of presence.Item Improvement of VR Science Teaching Materials That Visualize Invisible Elements and Evaluation as a Self-study use(The Eurographics Association, 2023) Fujiwara, Miraku; Terata, Yuki; Saruta, Kazuki; Chen, Guoyue; Abey Campbell; Claudia Krogmeier; Gareth YoungTeaching materials using virtual reality (VR) technology are expected to further improve learners' understanding. However, it is assumed that the instructor's engineering knowledge may be insufficient to introduce these materials in the classroom, and that it will take time to educate the instructors. Therefore, we improved VR science teaching materials that visualize electric currents and magnetic fields for self-study at home, and reviewed their self-study use. Experiments were conducted with university students, and we found that our modifications improved usability and VR sickness.