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"id": "lanzarotti-2025-viseps",
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"title": "VisEPS: a visual explorer of parameter spaces for networked models",
"date": "2025-12-23",
"abstract": "Simulations of complex social systems, such as those represented by epidemiological models, have been very useful in supporting decision makers during the last pandemic. These models generally comprise a high number of parameters, which makes it hard to identify the values that best reproduce the empirical data. Furthermore, different combinations of parameters may achieve a good fit, which renders an automatic solution ill-suited to the task. A human expert is required to make the final decisions about the optimal parameter values. We present VisEPS (Visual Explorer of Parameter Spaces), a framework for visually analyzing the effects of a very large set of parameters, with the aim of fitting a geographically explicit networked model to data obtained during the COVID-19 pandemic. We use a networked extension of a susceptible-infected-recovered (SIR) model to reproduce the epidemic dynamics in the city of Buenos Aires and its neighboring interconnected districts. We overlay binned scatterplots on a map, which facilitates the visual identification of each district and its connections. To further explore the model’s performance against data, additional views, such as parallel coordinates and histograms, along with drill-down mechanisms, have been incorporated. Finally, a use case is described in which the level of connectivity between districts is included in the analysis. The identification of suitable parameter ranges is facilitated by an iterative and incremental process, whereby new sets of simulations are incrementally requested, guided by interactive visual inspections. This permits the exploration of a parameter space that would otherwise be impossible to fully explore.",
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"date_to": "2025-07-04",
"doi": "10.1007/s12650-025-01093-2",
"event": "The 2nd Japan Visualization Symposium (JapanVis 2025)",
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"journal": "Journal of Visualization",
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"pages": "15",
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"Networked simulation models",
"Scalable visual parameter tuning",
"Visual model parameter fitting"
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"id": "oda-2025-artevoviewer",
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"repositum_id": "20.500.12708/225534",
"title": "ArtEvoViewer: A System for Visualizing Interpersonal Influence Among Painters",
"date": "2025-10-31",
"abstract": "Large-scale and objective painting analyses have recently gained attention. In particular, analyzing influence between individual painters requires substantial effort and is hard to reproduce due to subjectivity. Despite increasing demand for automatic estimation, this remains unresolved because such influence is complex and often directional, making it difficult to model. In this paper, we develop an interactive system that visualizes, manipulates, and analyses chains of painterly influence as a network. Using 32,401 paintings, the system infers directional links from color and brushstroke features. The resulting network based on color style features captures stylistic lineages such as landscape-focused and portrait-focused streams, while a multifaceted analysis of Picasso shows that Cézanne's impact appears in brushwork rather than color. Our contributions are twofold: (1) the use of an evolutionary model to assign explicit direction to painter influence and support art historical interpretation, and (2) providing a visualization system that allows dynamic comparison of influence networks based on multiple image features.",
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"booktitle": "2025 29th International Conference Information Visualisation (IV)",
"date_from": "2025-08-05",
"date_to": "2025-08-08",
"doi": "10.1109/IV68685.2025.00041",
"event": "29th International Conference Information Visualisation (IV)",
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"location": "Darmstadt",
"pages": "6",
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"publisher": "IEEE",
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"tu_id": null,
"repositum_id": "20.500.12708/225648",
"title": "TacMedVR: Immersive VR Training for Tactical Medicine—Evaluating Interaction and Stress Response",
"date": "2025-09-25",
"abstract": "This paper presents the development and evaluation of a virtual reality (VR) training simulation for tactical emergency medicine, created in Unity and optimized for the Meta Quest 3 headset. The simulation places users in a high-stress scenario inspired by real knife attacks and incorporates natural hand tracking for interaction. Core training elements include triage, bleeding control, and communication with victims and bystanders. A qualitative study with ten participants, all with prior first aid or tactical medical training, explored three key research questions: (1) To what extent does the realistic recreation of real-world events affect trainees' perceived psychological stress and sense of immersion in virtual reality simulations? (2) How do hand tracking and traditional controllers compare in terms of usability? (3) How is VR perceived as a complementary or alternative method to conventional training? Thematic analysis revealed that visual and auditory realism enhanced immersion but did not consistently increase perceived stress. Hand tracking was considered intuitive but occasionally unreliable. Participants generally viewed VR as a valuable complement to traditional training, particularly for practicing workflows and rapid decision-making under pressure. The results underscore VR's potential as a scalable, engaging, and safe tool for preparing responders for high-threat environments.",
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"booktitle": "2025 11th International Conference on Virtual Reality (ICVR)",
"date_from": "2025-07-09",
"date_to": "2025-07-11",
"doi": "10.1109/ICVR66534.2025.11172647",
"event": "11th International Conference on Virtual Reality (ICVR 2025)",
"isbn": "979-8-3503-9273-9",
"lecturer": [
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"location": "Wageningen",
"pages": "6",
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"pages_to": "350",
"publisher": "IEEE",
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"keywords": [
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"Interaction Design",
"Medical Simulation",
"Simulation-Based Training",
"Virtual Reality in Education"
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"title": "MARV: Multiview Augmented Reality Visualisation for Exploring Rich Material Data",
"date": "2025-09",
"abstract": "Rich material data is complex, large and heterogeneous, integrating primary and secondary non-destructive testing data for spatial, spatio-temporal, as well as high-dimensional data analyses. Currently, materials experts mainly rely on conventional desktop-based systems using 2D visualisation techniques, which render respective analyses a time-consuming and mentally demanding challenge. MARV is a novel immersive visual analytics system, which makes analyses of such data more effective and engaging in an augmented reality setting. For this purpose, MARV includes three newly designed visualisation techniques: MDD Glyphs with a Skewness Kurtosis Mapper, Temporal Evolution Tracker, and Chrono Bins, facilitating interactive exploration and comparison of multidimensional distributions of attribute data from multiple time steps. A qualitative evaluation conducted with materials experts in a real-world case study demonstrates the benefits of the proposed visualisation techniques. This evaluation revealed that combining spatial and abstract data in an immersive environment improves their analytical capabilities and facilitates the identification of patterns, anomalies, as well as changes over time.",
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"doi": "10.1111/cgf.70150",
"issn": "1467-8659",
"journal": "Computer Graphics Forum",
"number": "6",
"pages": "15",
"publisher": "WILEY",
"volume": "44",
"research_areas": [
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"immersive analytics",
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"id": "dhanoa-2025-dsg",
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"repositum_id": "20.500.12708/209410",
"title": "D-Tour: semi-automatic generation of interactive guided tours for visualization dashboard onboarding",
"date": "2025-01",
"abstract": "Onboarding a user to a visualization dashboard entails explaining its various components, including the chart types used, the data loaded, and the interactions available. Authoring such an onboarding experience is time-consuming and requires significant knowledge and little guidance on how best to complete this task. Depending on their levels of expertise, end users being onboarded to a new dashboard can be either confused and overwhelmed or disinterested and disengaged. We propose interactive dashboard tours (D-Tours) as semi-automated onboarding experiences that preserve the agency of users with various levels of expertise to keep them interested and engaged. Our interactive tours concept draws from open-world game design to give the user freedom in choosing their path through onboarding. We have implemented the concept in a tool called D-TOUR PROTOTYPE, which allows authors to craft custom interactive dashboard tours from scratch or using automatic templates. Automatically generated tours can still be customized to use different media (e.g., video, audio, and highlighting) or new narratives to produce an onboarding experience tailored to an individual user. We demonstrate the usefulness of interactive dashboard tours through use cases and expert interviews. Our evaluation shows that authors found the automation in the D-Tour Prototype helpful and time-saving, and users found the created tours engaging and intuitive. This paper and all supplemental materials are available at https://osf.io/6fbjp/.",
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"doi": "10.1109/TVCG.2024.3456347",
"issn": "1941-0506",
"journal": "IEEE Transactions on Visualization and Computer Graphics",
"number": "1",
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"publisher": "IEEE COMPUTER SOC",
"volume": "31",
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"repositum_id": "20.500.12708/210140",
"title": "BEMTrace: Visualization-driven approach for deriving Building Energy Models from BIM",
"date": "2025-01",
"abstract": "Building Information Modeling (BIM) describes a central data pool covering the entire life cycle of a construction project. Similarly, Building Energy Modeling (BEM) describes the process of using a 3D representation of a building as a basis for thermal simulations to assess the building's energy performance. This paper explores the intersection of BIM and BEM, focusing on the challenges and methodologies in converting BIM data into BEM representations for energy performance analysis. BEMTrace integrates 3D data wrangling techniques with visualization methodologies to enhance the accuracy and traceability of the BIM-to-BEM conversion process. Through parsing, error detection, and algorithmic correction of BIM data, our methods generate valid BEM models suitable for energy simulation. Visualization techniques provide transparent insights into the conversion process, aiding error identifcation, validation, and user comprehension. We introduce context-adaptive selections to facilitate user interaction and to show that the BEMTrace workfow helps users understand complex 3D data wrangling processes.",
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"repositum_id": "20.500.12708/216591",
"title": "Leveraging Popular Board Games to Teach Data Visualization",
"date": "2025",
"abstract": "To address the challenges in visualization education—particularly in motivating and engaging students—we propose the conceptual adaptation of popular board games into educational data visualization games. We present five unique adaptations ofwell-known board games, integrating their mechanics and materials into a data visualization learning process. For each game, we outline specific learning objectives and suggest strategies to extend the game-based approach to broader data visualization education. By combining familiar, engaging game mechanics with visualization content, we aim to foster critical engagement with the learning material while providing students with a foundational understanding of data visualization concepts. Early qualitative results from one of the games indicate a positive impact on players’ learning, boosting engagement and enjoyment.",
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"booktitle": "Visgames 2025: EuroVis Workshop on Visualization Play, Games, and Activities",
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"doi": "10.2312/visgames.20251165",
"editor": "Stoiber, C. and Boucher, M. and de Jesus Oliveira, V. A. and Schetinger, V. and Filipov, V. and Raidou, R. G. and Amabili, L. and Keck, M.",
"event": "VisGames 2025 colocated with EuroVis 2025 - 27th EG Conference on Visualization",
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"title": "Certain Uncertainties in Visual Data Science",
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"title": "BioMedical Visualization : Past Work, Current Trends, and Open Challenges",
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"title": "AccuStripes: Visual exploration and comparison of univariate data distributions using color and binning",
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"abstract": "Understanding and analyzing univariate distributions of data in terms of their shapes as well as their specific characteristics, regarding gaps, spikes, or outliers, is crucial in many scientific disciplines. In this paper, we propose a design space composed of the visual channels position and color for representing accumulated distributions. The designs are a mixture of color-coded stripes with density lines. The width and coloring of the stripes is based on the applied binning technique. In a crowd-sourced experiment we explore a subspace, called the AccuStripes (i.e., “accumulated stripes”) design space, consisting of nine representations. These AccuStripes designs integrate three composition strategies (color only, overlay, filled curve) with three binning techniques, one uniform (UB) and two adaptive methods, namely Bayesian Blocks (BB) and Jenks’ Natural Breaks (NB). We evaluate the accuracy, efficiency, and confidence ratings of the nine AccuStripes designs for structural estimation and comparison tasks. Across all study tasks, the overlay composition was found to be most accurate and preferred by observers. Furthermore, the results demonstrate that while no binning method performed best in both identification and comparison, detection of structures using adaptive binning was the most accurate one. For validation we compared the best AccuStripes’ design, i.e., the overlay composition, to line charts. Our results show that the AccuStripes’ design outperformed the line charts in accuracy for all study tasks.",
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"title": "Residency Octree: a hybrid approach for scalable web-based multi-volume rendering",
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"abstract": "We present a hybrid multi-volume rendering approach based on a novel Residency Octree that combines the advantages of out-of-core volume rendering using page tables with those of standard octrees. Octree approaches work by performing hierarchical tree traversal. However, in octree volume rendering, tree traversal and the selection of data resolution are intrinsically coupled. This makes fine-grained empty-space skipping costly. Page tables, on the other hand, allow access to any cached brick from any resolution. However, they do not offer a clear and efficient strategy for substituting missing high-resolution data with lower-resolution data. We enable flexible mixed-resolution out-of-core multi-volume rendering by decoupling the cache residency of multi-resolution data from a resolution-independent spatial subdivision determined by the tree. Instead of one-to-one node-to-brick correspondences, each residency octree node is mapped to a set of bricks from different resolution levels. This makes it possible to efficiently and adaptively choose and mix resolutions, adapt sampling rates, and compensate for cache misses. At the same time, residency octrees support fine-grained empty-space skipping, independent of the data subdivision used for caching. Finally, to facilitate collaboration and outreach, and to eliminate local data storage, our implementation is a web-based, pure client-side renderer using WebGPU and WebAssembly. Our method is faster than prior approaches and efficient for many data channels with a flexible and adaptive choice of data resolution.",
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"abstract": "Ergonomic risk assessment is now, due to an increased awareness, carried out more often than in the past. The\nconventional risk assessment evaluation, based on expert-assisted observation of the workplaces and manually filling in score tables, is\nstill predominant. Data analysis is usually done with a focus on critical moments, although without the support of contextual information\nand changes over time. In this paper we introduce ErgoExplorer, a system for the interactive visual analysis of risk assessment data.\nIn contrast to the current practice, we focus on data that span across multiple actions and multiple workers while keeping all contextual\ninformation. Data is automatically extracted from video streams. Based on carefully investigated analysis tasks, we introduce new\nviews and their corresponding interactions. These views also incorporate domain-specific score tables to guarantee an easy adoption\nby domain experts. All views are integrated into ErgoExplorer, which relies on coordinated multiple views to facilitate analysis through\ninteraction. ErgoExplorer makes it possible for the first time to examine complex relationships between risk assessments of individual\nbody parts over long sessions that span multiple operations. The newly introduced approach supports analysis and exploration at\nseveral levels of detail, ranging from a general overview, down to inspecting individual frames in the video stream, if necessary. We\nillustrate the usefulness of the newly proposed approach applying it to several datasets.",
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"abstract": "In radiation therapy (RT) for prostate cancer, changes in patient anatomy during treatment might lead to inadequate tumor coverage and higher irradiation of healthy tissues in the nearby pelvic organs. Exploring and analyzing anatomical variability throughout the course of RT can support the design of more robust treatment strategies, while identifying patients that are prone to radiation-induced toxicity. We present VAPOR, a novel application for the exploration of pelvic organ variability in a cohort of patients, across the entire treatment process. Our application addresses: (i) the global exploration and analysis of anatomical variability in an abstracted tabular view, (ii) the local exploration and analysis thereof in anatomical 2D/3D views, where comparative and ensemble visualizations are integrated, and (iii) the correlation of anatomical variability with radiation doses and potential toxicity. The workflow is based on available retrospective cohort data, which include segmentations of the bladder, the prostate, and the rectum through the entire treatment period. VAPOR is applied to four usage scenarios, which were conducted with two medical physicists. Our application provides clinical researchers with promising support in demonstrating the significance of treatment adaptation to anatomical changes.",
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"abstract": "Ensemble datasets describe a specific phenomenon (e.g., a simulation scenario or a measurements series) through a large set of individual ensemble members. These individual members typically do not differ too much from each other but rather feature slightly changing characteristics. In many cases, the ensemble members are defined in 3D space, which implies severe challenges when exploring the complete ensembles such as handling occlusions, focus and context or its sheer datasize. In this paper we address these challenges and put our focus on the exploration of local features in 3D volumetric ensemble datasets, not only by visualizing local characteristics, but also by identifying connections to other local features with similar characteristics in the data. We evaluate the variance in the dataset and use the the spatial median (medoid) of the ensemble to visualize the differences in the dataset. This medoid is subsequently used as a representative of the ensemble in 3D. The variance information is used to guide users during the exploration, as regions of high variance also indicate larger changes within the ensemble members. The local characteristics of the regions can be explored by using our proposed 3D probing widgets. These widgets consist of a 3D sphere, which can be positioned at any point in 3D space. While moving a widget, the local data characteristics at the corresponding position are shown in a separate detail view, which depicts the local outliers and their surfaces in comparison to the medoid surface. The 3D probing widgets can also be fixed at a user-defined position of interest. The fixed probing widgets are arranged in a similarity graph to indicate similar local data characteristics. The similarity graph thus allows to explore whether high variances in a certain region are caused by the same dataset members or not. Finally, it is also possible to compare a single member against the rest of the ensemble. We evaluate our technique through two demonstration cases using volumetric multi-label segmentation mask datasets, two from the\nindustrial domain and two from the medical domain.",
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"abstract": "In situ analysis is becoming increasingly important in the evaluation of existing as well as novel materials and components. In this domain, specialists require answers on questions such as: How does a process change internal and external structures of a component? or How do the internal features evolve?In this work, we present a novel integrated visual analysis tool to evaluate series of X-ray Computed Tomography (XCT) data. We therefore process volume datasets of a series of XCT scans, which non-destructively cover the evolution of a process by in situ scans. After the extraction of individual features, a feature tracking algorithm is applied to detect changes of features throughout the series as events. We distinguish between creation, continuation, split, merge and dissipation events. As an explicit tracking is not always possible, we introduce the computation of a Tracking Uncertainty. We visualize the data together with the determined events in multiple linked-views, each emphasizing individual aspects of the 4D-XCT dataset series: A Volume Player and a 3D Data View show the spatial feature information, whereas the global overview of the feature evolution is visualized in the Event Explorer. The Event Explorer allows for interactive exploration and selection of the events of interest. The selection is further used as basis to calculate a Fuzzy Tracking Graph visualizing the global evolution of the features over the whole series.We finally demonstrate the results and advantages of the proposed tool using various real world applications, such as a wood shrinkage analysis and an AlSiC alloy under thermal load. Graphical abstractDisplay Omitted HighlightsWe calculate a Tracking Uncertainty in order to find correlated features.The Event Explorer shows a global overview of events and feature properties.The Fuzzy Tracking Graph is used to track features through all time-steps.The Volume Player shows control elements to traverse the steps of a dataset series.",
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"title": "Interactive Semi-Automatic Categorization for Spinel Group Minerals",
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"abstract": "Spinel group minerals are excellent indicators of geological environments (tectonic settings). In 2001, Barnes and Roeder defined a set of contours corresponding to compositional fields for spinel group minerals. Geologists typically use this contours to estimate the tectonic environment where a particular spinel composition could have been formed. This task is prone to errors and requires tedious manual comparison of overlapping diagrams. We introduce a semi-automatic, interactive detection of tectonic settings for an arbitrary dataset based on the Barnes and Roeder contours. The new approach integrates the mentioned contours and includes a novel interaction called contour brush. The new methodology is integrated in the Spinel Explorer system and it improves the scientist's workflow significantly.",
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"title": "A Taxonomy of Integration Techniques for Spatial and Non-Spatial Visualizations",
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"title": "CoWRadar: Visual Quantification of the Circle of Willis in Stroke Patients",
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"abstract": "This paper presents a method for the visual quantification of cerebral arteries, known as the Circle of Willis (CoW).\nThe CoW is an arterial structure that is responsible for the brain’s blood supply. Dysfunctions of this arterial circle\ncan lead to strokes. The diagnosis relies on the radiologist’s expertise and the software tools used. These tools\nconsist of very basic display methods of the volumetric data without support of advanced technologies in medical\nimage processing and visualization. The goal of this paper is to create an automated method for the standardized\ndescription of cerebral arteries in stroke patients in order to provide an overview of the CoW’s configuration. This novel display provides visual indications of problematic areas as well as straightforward comparisons between\nmultiple patients. Additionally, we offer a pipeline for extracting the CoW from Time-of-Flight Magnetic Resonance\nAngiography (TOF-MRA) data sets. An enumeration technique for the labeling of the arterial segments is therefore\nsuggested. We also propose a method for detecting the CoW’s main supplying arteries by analyzing the coronal,\nsagittal and transverse image planes of the data sets. We evaluated the feasibility of our visual quantification\napproach in a study of 63 TOF-MRA data sets and compared our findings to those of three radiologists. The obtained results demonstrate that our proposed techniques are effective in detecting the arteries of the CoW.",
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"title": "New hybrid reformations of peripheral CT angiography: do we still need axial images?",
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"abstract": "Purpose\r\n\r\nTo quantify the detectability of peripheral artery stenosis on hybrid CT angiography (CTA) reformations.\r\nMethods\r\n\r\nHybrid reformations were developed by combining multipath curved planar reformations (mpCPR) and maximum intensity projections (MIP). Fifty peripheral CTAs were evaluated twice: either with MIP, mpCPR and axial images or with hybrid reformations only. Digital subtraction angiography served as gold standard.\r\nResults\r\n\r\nUsing hybrid reformations, two independent readers detected 88.0% and 81.3% of significant stenosis, respectively. However, CTA including axial images detected statistically significant more lesions (98%).\r\nConclusion\r\n\r\nPeripheral CTA reading including axial images is still recommended. Further improvement of these hybrid reformations is necessary.",
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"title": "Visualization of Object-Centered Vulnerability to Possible Flood Hazards",
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"abstract": "As flood events tend to happen more frequently, there is a growing demand for understanding the vulnerability of infrastructure to flood-related hazards. Such demand exists both for flood management personnel and the general public. Modern software tools are capable of generating uncertainty-aware flood predictions. However, the information addressing individual objects is incomplete, scattered, and hard to extract. In this paper, we address vulnerability to flood-related hazards focusing on a specific building. Our approach is based on the automatic extraction of relevant information from a large collection of pre-simulated flooding events, called a scenario pool. From this pool, we generate uncertainty-aware visualizations conveying the vulnerability of the building of interest to different kinds of flooding events. On the one hand, we display the adverse effects of the disaster on a detailed level, ranging from damage inflicted on the building facades or cellars to the accessibility of the important infrastructure in the vicinity. On the other hand, we provide visual indications of the events to which the building of interest is vulnerable in particular. Our visual encodings are displayed in the context of urban 3D renderings to establish an intuitive relation between geospatial and abstract information. We combine all the visualizations in a lightweight interface that enables the user to study the impacts and vulnerabilities of interest and explore the scenarios of choice. We evaluate our solution with experts involved in flood management and public communication.",
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"title": "Interactive Virtual Probing of 4D MRI Blood-Flow",
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"abstract": "Better understanding of hemodynamics conceivably leads to improved diagnosis and prognosis of cardiovascular diseases.\r\nTherefore, an elaborate analysis of the blood-flow in heart and thoracic arteries is essential. Contemporary MRI techniques\r\nenable acquisition of quantitative time-resolved flow information, resulting in 4D velocity fields that capture the blood-flow behavior.\r\nVisual exploration of these fields provides comprehensive insight into the unsteady blood-flow behavior, and precedes a quantitative\r\nanalysis of additional blood-flow parameters. The complete inspection requires accurate segmentation of anatomical structures, encompassing\r\na time-consuming and hard-to-automate process, especially for malformed morphologies. We present a way to avoid the\r\nlaborious segmentation process in case of qualitative inspection, by introducing an interactive virtual probe. This probe is positioned\r\nsemi-automatically within the blood-flow field, and serves as a navigational object for visual exploration. The difficult task of determining\r\nposition and orientation along the view-direction is automated by a fitting approach, aligning the probe with the orientations of\r\nthe velocity field. The aligned probe provides an interactive seeding basis for various flow visualization approaches. We demonstrate\r\nillustration-inspired particles, integral lines and integral surfaces, conveying distinct characteristics of the unsteady blood-flow. Lastly,\r\nwe present the results of an evaluation with domain experts, valuing the practical use of our probe and flow visualization techniques.",
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"title": "Nodes on Ropes: A Comprehensive Data and Control Flow for Steering Ensemble Simulations",
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"abstract": "Flood disasters are the most common natural risk and tremendous efforts are spent to improve their simulation and\nmanagement. However, simulation-based investigation of actions that can be taken in case of flood emergencies is rarely done.\nThis is in part due to the lack of a comprehensive framework which integrates and facilitates these efforts. In this paper, we tackle\nseveral problems which are related to steering a flood simulation. One issue is related to uncertainty. We need to account for\nuncertain knowledge about the environment, such as levee-breach locations. Furthermore, the steering process has to reveal how\nthese uncertainties in the boundary conditions affect the confidence in the simulation outcome. Another important problem is that the\nsimulation setup is often hidden in a black-box. We expose system internals and show that simulation steering can be comprehensible\nat the same time. This is important because the domain expert needs to be able to modify the simulation setup in order to include local\nknowledge and experience. In the proposed solution, users steer parameter studies through the World Lines interface to account for\ninput uncertainties. The transport of steering information to the underlying data-flow components is handled by a novel meta-flow. The\nmeta-flow is an extension to a standard data-flow network, comprising additional nodes and ropes to abstract parameter control. The\nmeta-flow has a visual representation to inform the user about which control operations happen. Finally, we present the idea to use\nthe data-flow diagram itself for visualizing steering information and simulation results. We discuss a case-study in collaboration with a\ndomain expert who proposes different actions to protect a virtual city from imminent flooding. The key to choosing the best response\nstrategy is the ability to compare different regions of the parameter space while retaining an understanding of what is happening\ninside the data-flow system.",
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"abstract": "Computer simulation has become an ubiquitous tool to investigate the nature of systems. When steering a simulation, users modify parameters to study their impact on the simulation outcome. The ability to test alternative options provides the basis for interactive decision making. Increasingly complex simulations are characterized by an intricate interplay of many heterogeneous input and output parameters. A steering concept that combines simulation and visualization within a single, comprehensive system is largely missing. This talk targets the basic components of a novel integrated steering system called Visdom to support the user in the decision making process. The proposed techniques enable users to examine alternative scenarios without the need for special simulation expertise. To accomplish this, we propose World Lines as a management strategy for multiple, related simulation runs. In a dedicated view, users create and navigate through many simulation runs. New decisions are included through the concept of branching. To account for uncertain knowledge about the input parameters, we provide the ability to cover full parameter distributions. Via multiple cursors, users navigate a system of multiple linked views through time and alternative scenarios. In this way, the system supports comparative visual analysis of many simulation runs. Since the steering process generates a huge amount of information, we employ the machine to support the user in the search for explanations inside the computed data. Visdom is built on top of a data-flow network to provide a high level of modularity. A decoupled meta-flow is in charge of transmitting parameter changes from World Lines to the affected dataflow nodes. To direct the user attention to the most relevant parts, we provide dynamic visualization inside the flow diagram. The usefulness of the presented approach is substantiated through case studies in the field of flood management. The Visdom application enables the design of a breach closure by dropping sandbags in a virtual environment.",
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"abstract": "In this paper we describe a novel method to integrate interactive visual analysis and machine learning to support the insight generation of the user. The suggested approach combines the vast search and processing power of the computer with the superior reasoning and pattern recognition capabilities of the human user. An evolutionary search algorithm has been adapted to assist in the fuzzy logic formalization of hypotheses that aim at explaining features inside multivariate, volumetric data. Up to now, users solely rely on their knowledge and expertise when looking for explanatory theories. However, it often remains unclear whether the selected attribute ranges represent the real explanation for the feature of interest. Other selections hidden in the large number of data variables could potentially lead to similar features. Moreover, as simulation complexity grows, users are confronted with huge multidimensional data sets making it almost impossible to find meaningful hypotheses at all. We propose an interactive cycle of knowledge-based analysis and automatic hypothesis generation. Starting from initial hypotheses, created with linking and brushing, the user steers a heuristic search algorithm to look for alternative or related hypotheses. The results are analyzed in information visualization views that are linked to the volume rendering. Individual properties as well as global aggregates are visually presented to provide insight into the most relevant aspects of the generated hypotheses. This novel approach becomes computationally feasible due to a GPU implementation of the time-critical parts in the algorithm. A thorough evaluation of search times and noise sensitivity as well as a case study on data from the automotive domain substantiate the usefulness of the suggested approach.",
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"title": "VOTS: VOlume doTS as a Point-Based Representation of Volumetric Data",
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"title": "Parallel Peeling of Curvilinear Grids",
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"abstract": "In this paper we present a novel hybrid CPU-GPU approach for rendering\r\ncurvilinear grids. Visibility sorting is accomplished by parallel\r\npeeling cells off the grid, utilizing an active cell peeling front. In\r\neach step, we compute the ray-cell intersection coordinates on the\r\nGPU, perform accurate volume integration (CPU), and determine\r\nthe set of active cells for the next iteration (GPU). The approach\r\nrequires only standard graphics capabilities and can therefore be\r\nused on any commodity PC, including laptops. Furthermore, the\r\nmain memory requirements are negligible since the required data\r\nstructures are minimal.\r\nThe main advantage of our algorithm is that we exploit hardware\r\nacceleration for the expensive visibility sorting which is bene-\r\nficial over time due to the faster performance increase of GPUs over\r\nCPUs. Due to the simplicity of the algorithm and its low requirements\r\non preprocessing and main memory, it is well suited for thin\r\nclients. Last but not least, the approach could easily be extended to\r\nirregular grids using tetrahedra.",
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"title": "Non-linear Model Fitting to Parameterize Diseased Blood Vessels",
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"abstract": "Accurate estimation of vessel parameters is a prerequisite for automated visualization and analysis of normal and diseased blood vessels. The objective of this research is to estimate the dimensions of lower extremity arteries, imaged by computed tomography (CT).\nThe vessel is modeled using an elliptical or cylindrical structure with specific dimensions, orientation and blood vessel mean density. The model separates two homogeneous regions: Its inner side represents a region of density for vessels, and its outer side a region for background. Taking into account the point spread function (PSF) of a CT scanner, a function is modeled with a Gaussian kernel, in order to smooth the vessel boundary in the model. A new strategy for vessel parameter estimation is presented. It\nstems from vessel model and model parameter optimization by a nonlinear optimization procedure (the Levenberg-Marquardt technique). The method provides center location, diameter and orientation of the vessel as well as blood and background mean density values. The method is tested on synthetic data and real patient data with encouraging results.",
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"title": "The VesselGlyph: Focus & Context Visualization in CT-Angiography",
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"abstract": "Reliable and complete blood-vessel segmentation is still a challenging problem. This is especially true in the presence of morphologic changes resulting from atherosclerotic diseases. In this paper we take advantage of partially segmented data with approximately identified vessel centerlines to comprehensively visualize the diseased peripheral arterial tree.\r\nWe introduce the VesselGlyph as an abstract notation for novel focus & context visualization techniques of tubular structures such as contrast-medium enhanced arteries in CT-Angiography (CT-A). The proposed techniques combine direct volume rendering (DVR) and curved planar reformation (CPR) within a single image. The VesselGlyph consists of several regions where different rendering methods are used. Region type, the used visualization method and region parameters depend on the distance from the vessel centerline and on viewing parameters as well. By selecting proper rendering techniques for different regions, vessels are depicted in a naturally looking and undistorted anatomic context.\r\nIn this paper we furthermore present a way how to implement the proposed techniques in software and by means of modern 3D graphics accelerators.",
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"title": "GPU-based Frequency Domain Volume Rendering",
"date": "2004-04",
"abstract": "Frequency domain volume rendering (FVR) is a volume\r\nrendering technique with lower computational complexity\r\nas compared to other techniques. In this paper\r\nthe FVR algorithm is accelerated by factor of 17\r\nby mapping the rendering stage to the GPU. The overall\r\nhardware-accelerated pipeline is discussed and the\r\nchanges according to previous work are pointed out. The\r\nthree-dimensional transformation into frequency domain\r\nis done in a pre-processing step. The rendering step is\r\ncomputed completely on the GPU. First the projection\r\nslice is extracted. Four different interpolation schemes\r\nare used for resampling the slice from the data represented\r\nby a 3D texture. The extracted slice is transformed\r\nback into the spatial domain using the inverse\r\nFast Fourier or Fast Hartley Transform. The rendering\r\nstage is implemented through shader programs running\r\non programmable graphics hardware achieving highly interactive\r\nframerates.",
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"title": "Accuracy of Automated Centerline Approximation Algorithms for Lower Extremity Vessels in CTA Phantom",
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"abstract": "Purpose: The accurate determination of the central vessel axis is a prerequisite for automated visualization (curved planar reformation) and quantitation. The purpose of this work was to assess the accuracy of different algorithms for automated centerline detection in a phantom simulating the peripheral arterial tree.\r\nMethods and Material: Six algorithms were used to determine the centerline of a synthetic peripheral arterial vessel (aorto-to-pedal arteries, diameter 18-0.6mm) dataset (256x256x600, voxel size 0.5x0.5x0.5mm). They are ray-casting/thresholding (RCT), ray-casting/maximum gradient (RCMG), block matching (BM), fitting to ellipse (FE), center of gravity (CoG), and Randomized Hough transform (RHT). Gaussian noise whith a sigma: 0, 5 and 10 was used to observe the accuracy of the method under noise influence The accuracy of automatic centerline determination was quantified by measuring the error-distance between the derived centerlines, and the known centerline course of the synthetic dataset.\r\nResults: BM demonstrated unacceptable performance in large vessels (>5mm) when the shift used was less than 3 voxels. RCMG demonstrated a greater error (mean of the error 4.73mm) in large diameter (>15mm) vessels than in small diameter (<15mm) vessels (mean of the error 0.64mm). Because RHT and FE use Canny edge detector preprocessing, both are sensitive to noise. CoG and RCT keep the mean of the error-distance significantly smaller (0.7mm and 0.9mm respectively) than all other algorithms.\r\nConclusion: CoG and RCT algorithms provide the most efficient centerline approximation over a wide range of vessel diameters. ",
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"title": "Semi-Automatic Topology Independent Contour-Based 2 1/2 D Segmentation Using Live-Wire",
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"abstract": "In general three-dimensional segmentation algorithms assume objects to have connected homogeneous regions.\r\nHowever in some cases objects are defined by a fuzzy boundary surface and consist of an inhomogeneous\r\ninternal structure. In the following a new three-dimensional segmentation technique exploiting the contour\r\ndetection capabilities of live-wire is proposed. The algorithm consists of two basic steps. First contours are\r\noutlined by the user on a small number of planar cross-sections through the object using live-wire. Second the\r\ntraced contours are used for reconstructing the object surface automatically in each slice using live-wire again.\r\nThis user-friendly segmentation algorithm is independent from object topology as the topology is implicitly\r\ndefined during the reconstruction process.",
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"title": "Diagnostic Relevant Visualization of Vascular Structures",
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"abstract": "Traditional volume visualization techniques sometimes provide incomplete\r\nclinical information needed for applications in medical visualization.\r\nIn the area of vascular visualization important features such as the lumen of a\r\ndiseased vessel segment may not be visible. One way to display vascular structures\r\nfor diagnostic purposes is to generate longitudinal cross-sections in order to\r\nshow their lumen, wall, and surrounding tissue in a curved plane. Curved planar\r\nreformation (CPR) has proven to be an acceptable practical solution. We discuss\r\nfour different methods to generate CPR images from single vessel segments: Projected\r\nCPR, stretched CPR, straightened CPR, and helical CPR. Furthermore we\r\ninvestigate three different methods for displaying vascular trees: Multi-path projected\r\nCPR, multi-path stretched CPR, and untangled CPR. The principle concept\r\nof each method is discussed and detailed information for the realization is given.\r\n In addition the properties, advantages and disadvantages of each method are summarized.",
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"abstract": "We report on using computed tomography (CT) as a model acquisition\ntool for complex objects in computer graphics. Unlike other modeling\nand scanning techniques the complexity of the object is irrelevant in\nCT, which naturally enables to model objects with, for example,\nconcavities, holes, twists or fine surface details. Once the data is\nscanned, one can apply post-processing techniques aimed at its further\nenhancement, modification or presentation. For demonstration purposes\nwe chose to scan a Christmas tree which exhibits high complexity which\nis difficult or even impossible to handle with other\ntechniques. However, care has to be taken to achieve good scanning\nresults with CT. Further, we illustrate the post-processing by means\nof data segmentation and photorealistic as well as non-photorealistic\n\t\t surface and volume rendering techniques.",
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"title": "CPR - Curved Planar Reformation",
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"abstract": "Visualization of tubular structures such as blood vessels is an\nimportant topic in medical imaging. One way to display tubular\nstructures for diagnostic purposes is to generate longitudinal\ncross-sections in order to show their lumen, wall, and surrounding\ntissue in a curved plane. This process is called Curved Planar\nReformation (CPR). We present three different methods to generate\nCPR images. A tube-phantom was scanned with Computed Tomography (CT)\nto illustrate the properties of the different CPR methods. Furthermore\nwe introduce enhancements to these methods: thick-CPR, rotating-CPR\n \t\t and multi-path-CPR.",
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"title": "Smart surface interrogation for advanced visualization techniques",
"date": "2002-01",
"abstract": "Highly elaborated visualization techniques that are\nbased on surfaces often are independent from the\norigin of the surface data. Nevertheless, most of the\nrecently presented advanced visualization methods\nwere developed for a specific type of surface\nalthough principally applicable to generic\nsurfaces. In this paper we discuss a unified surface\ninterrogation model which provides generic access to\nsurface properties up to degree two, i.e., surface\npoint locations, normals, and curvature properties,\n(almost) regardless of the origin of the\nsurface. Surface types and interrogation algorithms\nare compared and summarized. At the end of this paper\nwe present an object-oriented implementation of this\n\t\t model, called SMURF.",
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"title": "Smooth Shape-Based Interpolation using the Conjugate Gradient Method",
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"title": "Anwendungsbeispiele medizinischer Visualisierung",
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"title": "Endo View: A Phantom Study of a Tracked Virtual Bronchoscopy",
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"title": "Insight into Data Through Visualization",
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"abstract": "Computer graphics, scientific visualization, information visualization, and graph drawing are areas which deal with visual\ninformation layout. They all use the remarkable properties of\nthe human visual perception to rapidly absorb and analyse visual\ninformation. The paper discusses important visualization aspects\nand gives examples of how visualization techniques facilitate\ninsight into data characteristics. The connection between\n visualization and graph drawing is shortly discussed.",
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"abstract": "Although volume visualization has already grown out of its infancy,\nthe most commonly used reconstruction techniques are still trilinear\ninterpolation for function reconstruction and central differences\n(most often in conjunction with trilinear interpolation) for\ngradient reconstruction. Nevertheless, quite some research in the\nlast few years was devoted to improve this situation. This paper\nsurveys the more important methods, emphasizing selected work in\nfunction and gradient reconstruction, and gives an overview over the\nrather new development of exploiting curvature properties for volume\n visualization purposes.",
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"title": "Direction-Driven Shape-Based Interpolation of Volume Data",
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"abstract": "We present a novel approach to shape-based interpolation of\ngray-level volume data. In contrast to the segmentation-based\ntechniques our method directly processes the scalar volume\nrequiring no user interaction. The key idea is to perform the\ninterpolation in the directions given by analysis of the\neigensystem of the structure tensor. Our method processes a 256\nx 256 slice within a couple of seconds yielding satisfactory\nresults. We give a quantitative and a visual comparison to the\nlinear inter-slice interpolation. Analysis of the results lead\nus to the conclusion that our technique has a strong potential\nto compete with well-established shape-based interpolation\n algorithms.",
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"title": "Fast Visualization of Object Contours by Non-Photorealistic Volume Rendering",
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"abstract": "In this paper we present a fast visualization technique for\nvolumetric data, which is based on a recent non-photorealistic\nrendering technique. Our new approach enables alternative\ninsights into 3D data sets (compared to traditional approaches\nsuch as direct volume rendering or iso-surface rendering).\nObject contours, which usually are characterized by locally high\ngradient values, are visualized regardless of their density values.\nCumbersome tuning of transfer functions, as usually needed for setting\nup DVR views is avoided. Instead, a small number of parameters is available to adjust the non-photorealistic display.\nBased on the magnitude of local gradient information as well as on\nthe angle between viewing direction and gradient vector, data values\nare mapped to visual properties (color, opacity), which then are\ncombined to form the rendered image (MIP is proposed as the default\ncompositing stragtegy here). Due to the fast implementation of this\nalternative rendering approach, it is possible to interactively\ninvestigate the 3D data, and quickly learn about internal structures.\nSeveral further extensions of our new approach, such as level lines\n are also presented in this paper.",
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"title": "Optimal Regular Volume Sampling",
"date": "2001-04",
"abstract": "The classification of volumetric data sets as well as their\nrendering algorithms are typically based on the representation of the\nunderlying grid. Grid structures based on a Cartesian lattice are\nthe de-facto standard for regular representations of volumetric\ndata. In this paper we introduce a more general concept of regular\ngrids for the representation of volumetric data. We demonstrate that\na specific type of regular lattice - the so-called\nbody-centered cubic - is able to represent the same data set\nas a Cartesian grid to the same accuracy but with 29.3% less\nsamples. This speeds up traditional volume\nrendering algorithms by the same ratio, which we demonstrate by\nadopting a splatting implementation for these new lattices.\nWe investigate different filtering methods required for computing\nthe normals on this lattice. The lattice representation results also\nin lossless compression ratios that are better\nthan previously reported.\nAlthough other regular grid structures achieve the same sample\nefficiency, the body-centered cubic is particularly easy to use. The\nonly assumption necessary is that the underlying volume is isotropic\nand band-limited - an assumption that is valid for most practical\n data sets.",
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"title": "Virtual Colon Unfolding",
"date": "2001-04",
"abstract": "The majority of virtual endoscopy techniques tries to simulate a\nreal endoscopy. A real endoscopy does not always give the optimal\ninformation due to the physical limitations it is subject to. In\nthis paper, we deal with the unfolding of the surface of the colon\nas a possible visualization technique for diagnosis and polyp\ndetection. A new two-step technique is presented which deals with\nthe problems of double appearance of polyps and nonuniform\nsampling that other colon unfolding techniques suffer from. In the\nfirst step, a distance map from a central path induces nonlinear\nrays for unambiguous parameterization of the surface. The second\nstep compensates for locally varying distortions of the unfolded\nsurface. A technique similar to magnification fields in\ninformation visualization is hereby applied. The technique\n produces a single view of a complete virtually dissected colon.",
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"title": "Peripheral Vessel Investigation For Routine Clinical Use",
"date": "2001-03",
"abstract": "This paper is about computed tomography angiography based vessel exploration.\nLarge image sequences of the lower extremities are investigated in a clinical\nenvironment. Two different approaches for peripheral vessel diagnosis dealing\nwith stenosis and calcification detection are introduced. The paper presents an\nautomated vessel-tracking tool for curved planar reformation. A user interactive\n segmentation tool for bone removal is proposed.",
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"title": "Hardware Accelerated High-Quality Reconstruction of Volumetric Data on PC Consumer Hardware",
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"title": "Interactive Volume Rendering based on a \"Bubble Model\"",
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"title": "Direction-Driven Shape-Based Interpolation of Volume Data",
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"note": "Proceedings of Vision, Modeling and Visualization 2001, November 2001, Stuttgart, Germany, pages 113-120,521",
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"title": "Exploiting Eigenvalues of the Hessian Matrix for Volume Decimation",
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"note": "Proceedings of IEEE Visualization 2001, October 2001, San Diego, USA, pp. 91-98
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"title": "Mastering Transfer Function Specification by Using VolumePro Technology",
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"note": "Proceedings of the 17th Spring Conference on Computer Graphics (SCCG'01), Budmerice, Slovakia, IEEE, April 2001, pp. 279-286, ISBN 0-7695-1215-1",
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{
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"title": "Perspective Projection through Parallel Projected Slabs for Virtual Endoscopy",
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"note": "Proceedings of the 17th Spring Conference on Computer Graphics (SCCG'01), Budmerice, Slovakia, IEEE, April 25th-28th, 2001, pp. 287-295, ISBN 0-7695-1215-1",
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{
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"note": "Proceedings of VisSym'01, Joint Eurographics - IEEE TCVG Symposium on Visualization, May 28 - May 30, pages 127-136 2001, Ascona, Switzerland",
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{
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"tu_id": null,
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"title": "Virtual Colon Flattening",
"date": "2000-12",
"abstract": "We present a new method to visualize virtual endoscopic\nviews. We\npropose to flatten the organ by the direct projection of the\nsurface onto a set of cylinders. Two sampling strategies are\npresented and the introduced distortions are studied. A\nnon-photorealistic technique is presented to enhance the\nperception of the images. Finally, an approximate but real-time\nendoscopic fly-through is possible by using the data obtained by\n the projection technique.",
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"title": "Interactive Volume Rendering based on a ''Bubble Model''",
"date": "2000-12",
"abstract": "In this paper an interactive volume rendering technique is presented\nwhich is based on a novel visualization model. We call the basic method\n``bubble model'' since iso-surfaces are rendered as thin\nsemi-transparent membranes similarly to blown soap bubbles. The\nprimary goal is to develop a fast previewing technique for volumetric data\nwhich does not require a time consuming transfer function\nspecification to visualize internal structures.\nOur approach uses a very simple rendering model controlled by only\ntwo parameters. We also present an interactive rotation technique\nwhich does not rely on any specialized hardware, therefore it can be\nwidely used even on low-end machines. Due to the interactive display,\nfine tuning is also supported since the modification of the rendering\n parameters has an immediate visual feedback.",
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"number": "TR-186-2-00-23",
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"title": "Salient Representation of Volume Data",
"date": "2000-12",
"abstract": "We introduce a novel approach for identification of objects of\ninterest in volume data. Our approach tries to convey the\ninformation contained in two essentially different concepts, the\nobject's boundaries and the narrow solid structures, in an easy\nand uniform way. The second order derivative operators in\ndirections reaching minimal response are involved for this task.\nTo show the superior performance of our method, we provide a\ncomparison to its main competitor -- surface extraction from\nareas of maximal gradient magnitude. We show that our approach\nprovides the possibility to represent volume data by its subset\n of a nominal size.",
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"number": "TR-186-2-00-26",
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"keywords": [
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"title": "Adaptive Visualization over the Internet",
"date": "2000-11",
"abstract": "This report gives an account to our work in adaptive visualization over the Internet ressearch. In this report we present our prototypes of adaptive visualization systems and an agent-based visualization model for network applications. We proposed a intelligent agent system for adaptively dispatch of visualization processes between a cluster of computers based on the changing network transmission bandwidth and processing prower. We also discuss the scientific contributions of our work to the current research in Interne-based visualization system design.",
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"authors": [
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"number": "TR-186-2-00-21",
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"pages_to": "21",
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"adaptive visualization",
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{
"id": "Hladuvka-2000-ExpX",
"type_id": "techreport",
"tu_id": null,
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"title": "Exploiting Eigenvalues of the Hessian Matrix for Volume Decimation",
"date": "2000-10",
"abstract": "In recent years the Hessian matrix and its eigenvalues became\nimportant in pattern recognition. Several algorithms based on the\ninformation they provide have been introduced. We recall the\nrelationship between the eigenvalues of Hessian matrix and the 2nd\norder edge detection filter, show the usefulness of treating them\nseparately and exploit these facts to design a combined threshold\n operation to generate sparse data sets.",
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"number": "TR-186-2-00-19",
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"pages_to": "7",
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"keywords": [
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"id": "Hauser-2000-Tho",
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"tu_id": null,
"repositum_id": null,
"title": "Thorough Insights by Enhanced Visualization of Flow Topology",
"date": "2000-08",
"abstract": "The investigation of flow data can be eased by the\nvisualization of topological information about the flow. Especially, when\nempirical models or numerical results from flow simulation are\ninvestigated, often the first step of analysis is to search\nstructural elements, like fixed points, separatrices, etc.\nThe work presented in this paper focuses on the visualization\nof 3D dynamical systems (comparable to flow data)\non the basis of results which are\nobtained by automatic analysis of the flow topology.\nFixed points are determined\nand the Jacobian matrix of the flow is investigated at these points\nof phase space to obtain the associated stable and/or unstable\ninvariant sets. Furthermore, this paper presents how Poincare maps\nare used to visualize structural information about cyclic flow\ndata together with direct visualization cues like stream lines\n or stream surfaces.",
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"substitute": null,
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"authors": [
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"number": "TR-186-2-00-17",
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"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Two-level volume rendering - fusing MIP and DVR",
"date": "2000-04",
"abstract": "In this paper we present a two-level approach for\nfusing direct\nvolume rendering (DVR) and maximum-intensity projection (MIP)\nwithin a joint rendering method.\nDifferent structures within the data-set are rendered locally by\neither MIP or DVR on an object-by-object basis. Globally all the\nresults of subsequent object renderings are combined in a merging step\n(usually compositing in our case). This allows to selectively\nchoose the most\nsuitable technique for depicting each object\nwithin the data, while keeping the amount of information contained in\nthe image at a reasonable level.\nThis is especially useful when inner\nstructures should be visualized together with semi-transparent outer\nparts, similar to the focus-and-context approach known\nfrom information visualization. We also present an implementation of our\n\napproach, which allows to explore volumetric data using\ntwo-level rendering at interactive frame rates.\n",
"authors_et_al": false,
"substitute": null,
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"authors": [
176,
184,
385,
166
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"number": "TR-186-2-00-11",
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"keywords": [
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{
"id": "Mroz-2000-MasX",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Mastering Interactive Surface Rendering for Java-Based\nDiagnostic Applications",
"date": "2000-04",
"abstract": "The display of iso-surfaces in medical data sets is an\nimportant visualization\ntechnique used by radiologists for the diagnosis of volumetric density\ndata sets. The demands put by radiologists on such a display\ntechnique are interactivity, multiple stacked transparent surfaces and\ncutting planes that allow an interactive clipping of the\nsurfaces. This paper presents a Java based, platform independent\nimplementation of a very fast surface rendering algorithm which\ncombines the advantages of explicit surface representation, splatting,\nand\nshear-warp projection to fulfill all these requirements. The algorithm\nis\nimplemented within the context of J-Vision, an application for viewing\nand\ndiagnosing medical images which is currently in use at various\nhospitals.\n",
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"authors": [
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165,
166
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"number": "TR-186-2-00-10",
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"id": "Theussl-2000-MWI",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Mastering Windows: Improving Reconstruction",
"date": "2000-04",
"abstract": "Ideal reconstruction filters, for function or arbitrary\nderivative\nreconstruction, have to be bounded in order to be\npracticable since they are infinite in their spatial extent. This can\nbe accomplished by multiplying them with windowing functions. In this\npaper we discuss and assess the quality of commonly used windows and\nshow that most of them are unsatisfactory in terms of numerical\naccuracy. The best performing windows are Blackman, Kaiser and\nGaussian windows. The latter two are particularly useful since both\nhave a parameter to control their shape, which, on the other hand,\nrequires to find appropriate values for these parameters. We show how\nto derive optimal parameter values for Kaiser and Gaussian windows\nusing a Taylor series expansion of the convolution sum. Optimal values\nfor function and first derivative reconstruction for window widths of\n two, three, four and five are presented explicitly.",
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"authors": [
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176,
166
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"number": "TR-186-2-00-08",
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"pages_to": "9",
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"title": "Mastering Interactive Virtual Bronchioscopy on a Low--End PC",
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"abstract": "Virtual endoscopy presents the cross-sectional acquired 3D-data of\na computer tomograph as an endoluminal view. The common approach\nfor the visualization of a virtual endoscopy is surface rendering,\nyielding images close to a real endoscopy. If external structures\nare of interest, volume rendering techniques have to be used.\nThese methods do not display the exact shape of the inner lumen\nvery well. For certain applications, e.g. operation planning of a\ntrans-bronchial biopsy, both, the shape of the inner lumen as well\nas outer structures like blood vessels and the tumor have to be\ndelineated. In this paper a method is described, that allows a\nquick and easy hybrid visualization using overlays of different\nvisualization methods like different surfaces or volume renderings\nwith different transfer functions in real time on a low-end PC. To\nachieve real time frame rates, image based rendering techniques\n have been used.",
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"note": "IEEE Visualization 2000 Proceedings, 2000, pp. 211-218. Revised version will be published in IEEE Transactions on Computer Graphics and Visualization",
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"note": "IEEE Transactions on Medical Imaging, 19(12), 2000",
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"title": "AlVis - an Aluminium-Foam Visualization and Investigation Tool",
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"note": "In W. deLeeuw R. vanLiere, (eds.), Data Visualization 2000, Springer Wien, pp. 229-238",
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"tu_id": null,
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"title": "AlVis - An Aluminium-Foam Visualization and Investigation Tool",
"date": "2000",
"abstract": null,
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"note": "Joint Eurographics - IEEE TCVG Symposium on Visualization (VisSym00), Amsterdam, Netherlands",
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},
{
"id": "Mroz-2000-Int",
"type_id": "misc",
"tu_id": null,
"repositum_id": null,
"title": "Interactive High-Quality Maximum Intensity Projection",
"date": "2000",
"abstract": null,
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"type_id": "misc",
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"repositum_id": null,
"title": "Mastering Interactive Surface Rendering for Java-Based Diagnostic Applications",
"date": "2000",
"abstract": null,
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"main_image": null,
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"authors": [
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"note": "IEEE Visualization 2000 Proceedings, 2000, pp. 437-440",
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{
"id": "Mroz-2000-Rea",
"type_id": "misc",
"tu_id": null,
"repositum_id": null,
"title": "Real-Time Maximum Intensity Projection",
"date": "2000",
"abstract": null,
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"authors": [
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"note": "In E. Gröller, H. Löffelmann, B. Ribarsky (eds.), Data Visualization'99, Springer Wien, pp. 135-144. Revised version \"Maximum Intensity Projection at Warp Speed\" in the Journal Computers & Graphics, 24(3), June 2000, pp. 343-352",
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"tu_id": null,
"repositum_id": null,
"title": "Gradient Estimation in Volume Data using 4D Linear Regression",
"date": "2000",
"abstract": null,
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"note": "Computer Graphics Forum 19(3), 2000, pp. C-351 - C-357",
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"id": "koenig-1999-AlV",
"type_id": "techreport",
"tu_id": null,
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"title": "AlVis - An Aluminium-Foam Visualization and\nInvestigation Tool",
"date": "1999-12",
"abstract": "In recent years there has been an increased interest in\nmetal foams in the field of material science. The stress absorbing\npotential is one of the most interesting properties for the application\nof aluminium foam (e.g. car manufacturing). Material\nscientists need to investigate the structure of metal foams in order to\noptimize their deformation behavior. An interactive tool\nfor the investigation is presented in this work. Real-time surface\nrendering, automatic parameter determination, and display of\nlocal and global foam properties enable the user to understand the\ncomplex structure of the metal foam.",
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212,
213,
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"number": "TR-186-2-99-23",
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"id": "Mroz-1999-IHQ",
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"tu_id": null,
"repositum_id": null,
"title": "Interactive High-Quality Maximum Intensity Projection",
"date": "1999-12",
"abstract": "Maximum Intensity Projection (MIP) is a volume\nrendering technique\nwhich is used to visualize high-intensity structures within volumetric\ndata. At each pixel the highest data value, which is encountered along a\n\ncorresponding viewing ray is depicted. MIP is, for example, commonly\nused to\nextract vascular structures from medical data sets (angiography). Due\nto lack of depth information in MIP images, animation or interactive\nvariation of viewing parameters is frequently used for\ninvestigation. Up to now no MIP algorithms exist which are of both\ninteractive speed and high quality.\nIn this paper we present a high-quality MIP algorithm (trilinear\ninterpolation within cells), which is up to 50 times faster than\nbrute-force MIP and at least 20 times faster than comparable optimized\ntechniques. This speed-up is accomplished by using an alternative\nstorage scheme for volume cells (sorted by value) and by removing\ncells which do not contribute to any MIP projection (regardless of the\nviewing direction) in a preprocessing step. Also, a fast maximum\nestimation within cells is used to further speed up the algorithm.\n",
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"number": "TR-186-2-99-25",
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"id": "Mroz-1999-MIP",
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"title": "Maximum Intensity Projection at Warp Speed",
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"abstract": "Maximum Intensity Projection (MIP) is a volume\nrendering technique\nwhich is used to extract high-intensity structures from volumetric\nscalar data. At\neach pixel the highest data value encountered along the\ncorresponding viewing ray is determined. MIP is commonly used to\nextract vascular\nstructures from medical MRI data sets, i.e., angiography. The usual way\nto\ncompensate for the loss of spatial and occlusion information in MIP\nimages\nis to view the data from different view points by rotating them. As the\ngeneration of a MIP is usually non-interactive, this is done by\ncalculating\nmultiple images offline and playing them back as an animation.\n\nIn this paper a novel algorithm is proposed which is capable of\ninteractively\ngenerating Maximum Intensity Projection images even on low-end\nhardware using parallel\nprojection. Two methods for preprocessing data and removing voxels\nwhich will due to their neighborhood never contribute\nto a MIP are discussed. The remaining voxels are stored in\na way which guarantees\noptimal cache coherency regardless of the viewing direction. For use\non low-end hardware, a preview-mode is included which renders only the\nmore significant parts of the volume during user interaction.\nFurthermore\nwe demonstrate the usability of our data\nstructure for extensions of the MIP technique like MIP with\ndepth-shading and Local Maximum Intensity Projection (LMIP).",
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"title": "Smart surface interrogation for advanced visualization\ntechniques",
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"abstract": "Highly elaborated visualization techniques that are based on\nsurfaces often are independent from the origin of the surface data.\nNevertheless, most of the recently presented advanced visualizatio\nmethods were developed\nfor a specific type of surface although principally applicable\nto generic surfaces. In this paper we discuss a unified surface\ninterrogation model which provides generic access to surface\nproperties up to degree two, i.e., surface-point locations,\nnormals, and curvature properties, regardless of the origin\nof the surface. Surface types and interrogation algorithms\nare compared and summarized. At the end of this paper we present\n an object-oriented implementation of this model, called {\\sc{}Smurf",
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"title": "The Multi-Dimensional Hartley Transform as a Basis for Volume\nRendering",
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"abstract": "The Fast Hartley Transform (FHT), a discrete version of the Hartley\nTransform (HT), has been studied in various papers and shown to be\nfaster and more convenient to implement and handle than the\ncorresponding Fast Fourier Transform (FFT). As the HT is not as\nnicely separable as the FT, a multidimensional version of the HT\nneeds to perform a final correction step to convert the result of\nseparate HTs for each dimension into the final multi-dimensional\ntransform. Although there exist algorithms for two and three\ndimensions, no generalization to arbitrary dimensions can be found\nin the literature. We demonstrate an easily comprehensible and\nefficient implementation of the fast HT and its multi-dimensional\nextension. By adapting this algorithm to volume rendering by the\nprojection-slice theorem and by the use for filter analysis in\nfrequency domain we further demonstrate the importance of the HT in\n this application area.",
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"title": "Fast Surface Rendering of Volumetric Data",
"date": "1999-05",
"abstract": "In this paper a new direct volume-rendering method is\npresented for fast display of iso-surfaces. In order\nto reduce the data to be processed, the algorithm\neliminates those voxels which are invisible from a\nspecific domain of viewing directions. The remaining\nsurface points are stored in an appropriate data\nstructure optimized for fast shear-warp projection.\nThe proposed data structure also supports the\napplication of cutting planes in order to visualize\nthe internal part of the volume as well. Unlike many\nother surface-oriented techniques, the presented method\ndoes not trade image quality for speed. It does not\nrequire any specialized hardware either to achieve\ninteractive frame rates, thus it can be widely used in\n medical imaging applications even on low end hardware.",
"authors_et_al": false,
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197,
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"id": "Mroz-1999-Adv",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Advanced High-Quality Maximum Intensity Projection for Volume Visualization",
"date": "1999-04",
"abstract": "Maximum Intensity Projection (MIP) is a volume\nrendering technique\nwhich is used to extract high-intensity structures from volumetric data.\nAt\neach pixel the highest data value encountered along the\ncorresponding viewing ray is determined. MIP is commonly used to\nextract vascular\nstructures from medical MRI data sets (angiography). Due to lack of\ndepth information in MIP images, animation of the viewpoint is\nfrequently used for viewing. Although\ninteractive MIP algorithms exist, the quality of the results is\nmoderate. The generation of high-quality MIP animation loops is\ncomputationally expensive with rendering times of several seconds per\nframe.\nIn this paper we present a fast algorithm for high-quality MIP.\nCells of the data set\nwhich will never contribute to a MIP due to their neighborhood are\nremoved during a preprocessing\nstep. The remaining cells are stored in a way which improves cache\ncoherency\nindependent of the viewing direction and minimizes the number of\nrequired maximum evaluations.",
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166
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"number": "TR-186-2-99-10",
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"id": "Mroz-1999-ReaX",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Real-Time Maximum Intensity Projection",
"date": "1999-04",
"abstract": "Maximum Intensity Projection (MIP) is a volume\nrendering technique\nwhich is used to extract high-intensity structures from volumetric data.\nAt\neach pixel the highest data value encountered along the\ncorresponding viewing ray is determined. MIP is commonly used to\nextract vascular\nstructures from medical MRI data sets (angiography). The usual way to\ncompensate for the loss of spatial and occlusion information in MIP\nimages\nis to view the data from different view points by rotating them. As the\ngeneration of MIP is usually non-interactive, this is done by\ncalculating\nmultiple images offline and playing them back as an animation.\n\nIn this paper a new algorithm is proposed which is capable of\ninteractively\ngenerating Maximum Intensity Projection images using parallel\nprojection and templates. Voxels of the data set\nwhich will never contribute to a MIP due to their neighborhood are\nremoved during a preprocessing\nstep. The remaining voxels are stored in a way which guarantees\noptimal cache coherency regardless of the viewing direction. For use\non low-end hardware, a preview-mode is included which renders only\nmore significant parts of the volume during user interaction.\nFurthermore\nwe demonstrate the usability of our data\nstructure for extensions of the MIP technique like MIP with\ndepth-shading and Local Maximum Intensity Projection (LMIP).",
"authors_et_al": false,
"substitute": null,
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"number": "TR-186-2-99-09",
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"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "VirEn: A Virtual Endoscopy System",
"date": "1999-03",
"abstract": "Virtual endoscopy systems are promising tools for the\nsimplification of daily clinical procedures. In this paper, a\nconceptual framework for a virtual endoscopy system (VirEn) is\nproposed, which is intended to be a highly interactive system.\nResearch efforts have concentrated on the generation of an\noptimal path for the automated navigation of the data set.\nExtensions to existing thinning algorithms used to generate the\noptimal path are presented and discussed. First results produced\nwith VirEn are shown.",
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"number": "TR-186-2-99-06",
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"title": "Multiple Views and Magic Mirrors - fMRI Visualization of the Human Brain",
"date": "1999-02",
"abstract": "Multimodal visualization of functional and anatomical\ndata of the human brain is an important field in medical volume\nvisualization. The aim of this application is to provide\nthe user with information on the location of functional\nactivations in the different regions of the brain. When the approach of\ndirect volume rendering is chosen, the visual impression of details\nusually suffers from accumulating the image from colors and\nopacities derived from the data set. We present extensions to\novercome this problem: \\emph{Transfer function volumes} are used for\nthe highlighting of activated regions. \\emph{Multiple views",
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212,
166
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"tu_id": null,
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"title": "Fast Maximum Intensity Projection using Binary Shear-Warp\nFactorization",
"date": "1999-01",
"abstract": "This paper presents a fast maximum intensity projection\ntechnique based on binary shear-warp factorization. The\nproposed method divides the density domain into a small\nnumber of intervals, and to each interval a binary code\nrepresentation is assigned. In a preprocessing step, an\nadditional volume is created which contains for each voxel\nthe code of the interval enclosing the given voxel density.\nWe present an appropriate data structure for storing this\nvolume and an efficient lookup table technique which can\nbe used to rapidly access a voxel of a certain density code.\nThe volume is efficiently resampled along viewing rays only\nin voxels where the densities reside in the interval which\n contains the appropriate maximum value.",
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"keywords": [
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"title": "Fast Generation of Curved Perspectives for Ultra-Wideangle Lenses in VR-Applications.",
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"title": "Visualization of Dynamical Systems.",
"date": "1999",
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"note": "F.Post, D. Silver (eds.) Journal Future Generation Computer Systems, Elsevier, Vol. 15(1), February 1999, pp.75-86.",
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"title": "Multiple Views and Magic Mirrors - fMRI Visualization of the Human Brain.",
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197,
212
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"note": "Proceedings of Spring Conference on Computer
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"title": "SMURF a Smart Surface model for advanced visualization techniques",
"date": "1999",
"abstract": null,
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"note": "N.M. Thalmann, V. Skala (eds.),
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"title": "Real-Time Maximum Intensity Projection.",
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"note": "E.Gröller, H. Löffelmann, B. Ribarsky (eds.),
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"title": "Graphische Datenverarbeitung.",
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"note": "IPeter Rechenberg, Gustav Pomberger, Handbuch der Informatik. Carl Hanser Verlag, second edition, pp. 807-854, 1999.",
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"id": "Vilanova-1999-Vir",
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"title": "VirEn: A Virtual Endoscopy System.",
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"title": "Smurf -- a Smart surface model\n\tfor advanced visualization techniques",
"date": "1998-10",
"abstract": "Highly elaborated visualization techniques that are based on surfaces often are independent from the origin of the surface data. For re-using advanced visualization methods for surfaces of various kind, we developed an abstract surface interrogation layer called Smurf. In this paper we discuss the steps necessary to unify multiple types of surfaces under a shared general purpose interface.",
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"title": "Color-Table Animation of Fast Oriented Line Integral\nConvolution\n \t\t\t\t for Vector Field Visualization",
"date": "1998-07",
"abstract": "Fast Oriented Line Integral Convolution (FROLIC), which is\na variant\nof LIC, illustrates 2D vector fields by approximating a\nstreamlet by\na set of disks with varying intensity. FROLIC does not only\nshow the\ndirection of the flow but also its orientation.\nThis paper presents color-table animation of FROLIC images.\nVarious\ncolor-table compositions are discussed in detail. When\nanimating\nFROLIC images visual artifacts (pulsation, synchronization)\nmust be\navoided. Several strategies in this respect are dealt with.\nColor-table animation of FROLIC has been implemented as\nVisual C++\napplication for Windows NT, whereby the calculation of the\ndynamical\nsystem is performed with Mathematica. This allows\nresearchers from\nvarious disciplines to conveniently explore and investigate\n \t\tanalytically defined 2D and 3D vector fields.",
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"title": "Real-TimeTechniques for 3D Flow Visualization",
"date": "1998-05",
"abstract": "Visualization of three dimensional flow has to overcome a lot of problems to be effective. Among them are occlusion of distant details, lack of directional and depth hints and cluttering. In this paper we present methods which address these problems for realtime graphic representations applicable in virtual environments. We use animated, opacity-mapped streamlines as visualization icon for 3D flow visualization. We present a texture mapping technique to keep the level of texture detail along a streamline nearly constant even when the velocity of the flow varies considerably. An algorithm is described which distributes the dashtubes evenly in space. We apply magic lenses and magic boxes as interaction techniques for investigating densly filled areas without overwhelming the observer with visual detail. Implementation details of these methods and their integration in our virtual environment conclude the paper.",
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"title": "Bringing Your Visualization Application to the Internet",
"date": "1998-04",
"abstract": "The Internet has a growing importance as a medium for\npresenting\nvisualization and offering visualization tools. Due to strong\nvariations in the quality of avaliable resources it is extremely\ndifficult to design visualization systems including the Internet, which\nare capable of interactively\nvisualizing user data. In this paper we identify requirements for\na distributed visualization system to interactively visualize user data.\nAs a possible solution to the identified problems we\npresent a model for a visualization pipeline capable of fulfilling these\nrequirements. Finally a proof-of-concept implementation of our ideas\ninto Net Phase Plane, a visualization tool for dynamical systems, is\ndiscussed.",
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"number": "TR-186-2-98-14",
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"title": "Selected Trends in Scientific Visualization",
"date": "1998-04",
"abstract": "Visualization became an important branch of scientific\nresearch during the past decade. Some topics of visualization, e.g., flow\nvisualization and volume visualization, already\nprovide lots of high-quality solutions to the most important\nproblems. Others such as information visualization, are rather\nyoung disciplines which continuously provide lots of new\nadvances. One such topic is the visualization over the Internet.\nQuite a number of approaches emerged during the last two years\nwhich facilitate this idea and embed the World Wide Web into the\nvisualization process. Another trend in visualization is\ncollaborative visualization within an augmented reality setup.\nUsers exploit real 3D interaction and augmented\nreality to combine\ncommunication and investigation during research or education.\nThirdly, the visualization of multi-dimensional and multi-modal\ndata is a rather hot challenge to current scientific research.\nCoping with the restriction of just a few dimensions for\nrepresenting visualization results is a big open problem in\nvisualization and currently subject to eager research.",
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"title": "Transfer Function Specification for the Visualization of\n Medical Data",
"date": "1998-03",
"abstract": "The application of transfer functions to map data\nvalues to visual properties as, e.g., color and opacity, is\na crucial step in direct volume rendering. Due to the\ncomplex relationship between the transfer function and the\nresulting image it is usually extremely difficult to model\nan appropriate mapping. In this paper we present an\nadvanced transfer function specification scheme for the\nvisualization of medical data. The concept of metadata is\nused to make the modeling of transfer functions more\nintuitive. A small number of parameters is sufficient to\ncompletely describe a transfer function, thus this\nspecification scheme is suitable for (semi-)automated search\n techniques.",
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"number": "TR-186-2-98-12",
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"title": "Visualizing Dynamical Systems near Critical Points",
"date": "1998-03",
"abstract": "In this paper we present two visualization techniques.\nOne uses the topological structure of the dynamical system near\ncritical points to build an abstract description of the flow.\nThe other places bunches of streamlets around the critical\npoints to visualize the flow characteristics locally.\nCombining both methods a powerful visualization technique is\npresent, since both the topological information as well as\n intuitive visual cues are provided.",
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"id": "Groeller-1998-TunVis",
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"tu_id": null,
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"title": "TunVis: Visualizing specific geologic features for\ntunnel planning and construction",
"date": "1998-02",
"abstract": "This paper describes a method and a system for visualizing a\nvirtual tunnel through an existing geologic formation and a\nmethod for the generation of a camera animation along the tunnel\naxis. The tunnel is built from geologic data coming from vertical\nsample drills from the mountain top along the selected tunnel axis.\nIts wire frame model is then edited by a geologist and image\ninformation of the rock appearance is textured onto the tunnel\nwall, resulting in a photorealistic representation of the expected\ngeologic rock formations. Finally a camera animation and video\noptions are defined to render a video sequence of the camera\n movement.",
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"number": "TR-186-2-98-08",
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"id": "Groeller-1998-VAD",
"type_id": "techreport",
"tu_id": null,
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"title": "Visualization of Analytically Defined Dynamical\nSystems",
"date": "1998-02",
"abstract": "The visualization of analytically defined dynamical systems is\nimportant for a thorough understanding of the underlying system\nbehavior. An overview of theoretical concepts concerning\nanalytically defined dynamical systems is given. Various\nvisualization techniques for dynamical systems are discussed.\nThree current research directions concerning the visualization of\ndynamical systems are treated in more detail. These are: texture\nbased techniques, visualization of high-dimensional dynamical\n systems, and advanced streamsurface representations. ",
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"number": "TR-186-2-98-06",
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"title": "Visualization of Dynamical Systems",
"date": "1998-02",
"abstract": "The visualization of analytically defined dynamical systems is\nimportant for a thorough understanding of the underlying system\nbehavior. An introduction to analytically defined dynamical\nsystems is given. Various visualization techniques for dynamical\nsystems are discussed. Several current research directions\nconcerning the visualization of dynamical systems are treated in\nmore detail. These are: texture based techniques, visualization\nof high-dimensional dynamical systems, advanced streamsurface\nrepresentations, local analysis - Poincare' sections,\n visualizing econometric models.",
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"title": "Real Time Simulation and Visualization of NC Milling\nProcesses for Inhomogeneous Materials on Low-End Graphics Hardware",
"date": "1998-01",
"abstract": "Simulation and visualization of NC milling processes\nhas become an\nimportant step in computer aided manufacturing. The usage of stock\nmaterials with specific locally varying properties (like density,\naccuracy, color, ...) becomes more and more important with new\ntechnologies emerging in the material industry. Our new approach,\nusing volumetric representation, has been adapted to this needs and\ncopes with inhomogeneous material properties. Taking color as one\npossible material property, our approach enables the visualization\nof milled wood or compound materials.\nFurthermore, our approach has been developed with the usage of\nlow-end graphics hardware in mind. The algorithms have been\noptimized to ensure interactive update rates even on standard\npersonal computers without hardware graphics acceleration.",
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"number": "TR-186-2-98-04",
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"title": "Enhancing the Visualization of Characteristic Structures\n\t in Dynamical Systems",
"date": "1998-01",
"abstract": "We present a thread of streamlets as a new\ntechnique to visualize\ndynamical systems in three-space. A trade-off is made between\nsolely visualizing a mathematical abstraction through\nlower-dimensional manifolds, i.e., characteristic structures such\nas fixed point, separatrices, etc., and directly encoding\nthe flow through stream lines or stream surfaces. Bundlers of\nstreamlets are\nselectively placed near characteristic trajectories.\nAn over-population of phase space with occlusion problems as a\nconsequence is omitted. On the other hand, information loss\nis minimized since characteristic structures of the flow are still\n illustrated in the visualization.",
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"id": "Fischel-1998-Cas",
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"title": "Case study: Visualizing Various Properties of Dynamical Systems",
"date": "1998",
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"note": "In 6th International Workshop on Digital Image Processing and Computer Graphics (DIP-97): Applications in Humanities and Natural Sciences, Emanuel Wenger, Leonid I. Dimitrov, Editors, Proceedings of SPIE vol 3346, pp. 146-154, (1998).",
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"title": "Real-Time Techniques for 3D Flow Visualization",
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"note": "In 6th International Workshop on Digital Image Processing and Computer Graphics (DIP-97): Applications in Humanities and Natural Sciences, Emanuel Wenger, Leonid I. Dimitrov, Editors, Proceedings of SPIE vol 3346, pp. 168-176, (1998).",
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"id": "Glaeser-1998-Eff",
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"title": "Efficient Volume-Generation During the Simulation of NC-Milling",
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"note": "Proceedings of the International Workshop on Visualization and Mathematics'97, Berlin-Dahlem, Germany, September, 16.-19., 1997. In H.-Ch. Hege, K. Polthier (eds), Mathematical Visualization, Springer Heidelberg, 1998, pp. 89-106.",
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"title": "Real Time Simulation and Visualization of NC Milling Processes for Inhomogeneous Materials on Low-End Graphics Hardware, In F.-E",
"date": "1998",
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"note": "Wolters, N. M. Patrikalakis (eds.), Proceedings of CGI'98 (Computer Graphics International), IEEE Computer Society, Hannover, Germany, June 22-26, 1998, pp. 338-349.",
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{
"id": "Loeffelmann-1998-Enh",
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"title": "Enhancing the Visualization of Characteristic Structures in Dynamical Systems",
"date": "1998",
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"note": "Proceedings of 9th EUROGRAPHICS Workshop on Visualization in Scientific Computing, Blaubeuren, Germany, April 20.-22., 1998, pp. 35-46. Republished in D. Bartz (ed.), Visualization in Scientific Computing'98, Springer, pp.59-68.",
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{
"id": "Loeffelmann-1998-Vis",
"type_id": "misc",
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"repositum_id": null,
"title": "Visualizing Poincaré Maps together with the Underlying Flow",
"date": "1998",
"abstract": null,
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399
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"note": "Proceedings of the International Workshop on Visualization and Mathematics'97, Berlin-Dahlem, Germany, September, 16.-19., 1997. In H.-Ch. Hege, K. Polthier (eds), Mathematical Visualization, Springer Heidelberg, 1998, pp. 315-328.",
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{
"id": "Loeffelmann-1998-Visu",
"type_id": "misc",
"tu_id": null,
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"title": "Visualizing Dynamical Systems near Critical Points, Proceedings of Spring Conference on Computer Graphics 1998 (SCCG'98), Budmerice, Slovakia, April 23.-25., 1998, pp",
"date": "1998",
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399
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"note": "175-184.",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1998/Loeffelmann-1998-Visu/",
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{
"id": "Meinhart-1998-Tun",
"type_id": "misc",
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"title": "TunVis: Visualizing specific geologic features for tunnel planning and construction, Proceedings of Spring Conference on Computer Graphics 1998 (SCCG",
"date": "1998",
"abstract": "",
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{
"id": "Milik-1998-Geo",
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"title": "Geometry of Mixed-mode Oscillations in the 3-d Autocatalator",
"date": "1998",
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"authors": [
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"note": "International Journal of Bifurcation and Chaos (IJBC), World Scientific Publishing Company, Vol. 8(3), pp. 505-519, March 1998.",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1998/Milik-1998-Geo/",
"__class": "Publication"
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{
"id": "Mroz-1998-Sel",
"type_id": "misc",
"tu_id": null,
"repositum_id": null,
"title": "Selected Trends in Scientific Visualization",
"date": "1998",
"abstract": null,
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"authors": [
166,
184,
399
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"note": "Invited Paper in Proceedings of Spring Conference on Computer Graphics 1998 (SCCG'98), Budmerice, Slovakia, April 23.-25., 1998, pp. 17-26.",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1998/Mroz-1998-Sel/",
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{
"id": "Fischel-1997-CSVVP",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Case study: Visualizing Various Properties of\n\t\t Dynamical Systems",
"date": "1997-09",
"abstract": "There is a wide range of visualization techniques for\ndynamical systems. These methods are used to visualize certain\nproperties as, e.g., stability of fixed points, characteristic changes\nof velocity, and bifurcations. This paper gives a short introduction\nto dynamical systems and describes several visualization\ntechniques. Some of those are applied to three different dynamical\nsystems. The application of different visualization methods to\ndynamical systems shows, how scientific visualization can be used for\nanalyzing the behavior of dynamical systems, and how visualization can\n make analysis of a dynamical system fast and efficient.",
"authors_et_al": false,
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"authors": [
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399,
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"number": "TR-186-2-97-16",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1997/Fischel-1997-CSVVP/",
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{
"id": "Milik-1997-GMMO",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Geometry of Mixed-mode Oscillations in the 3-d\n Autocatalator",
"date": "1997-08",
"abstract": "We present a geometric explanation of a basic mechanism\ngenerating mixed-mode oscillations in a prototypical simple\nmodel of a chemical oscillator. Our approach is based on\ngeometric singular perturbation theory and canard solutions. We\nexplain how the small oscillations are generated near a special\npoint, which is classified as a folded saddle-node for the\nreduced problem. The canard solution passing through this point\nseparates small oscillations from large relaxation type\noscillations. This allows to define a one-dimensional return\nmap in a natural way. This bimodal map is capable of\nexplaining the observed bifurcation sequence convincingly.",
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"authors": [
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"number": "TR-186-2-97-14",
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{
"id": "Glaeser-1997-EVG",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Efficient Volume-Generation During the Simulation of\n NC-Milling",
"date": "1997-04",
"abstract": "This paper presents an efficient and robust algorithm for\nthe geometric determination of swept volumes during the simulation of\nNC-milling (three-axis machining and five-axis machining). The boundary Y\nof the volume swept by a cutter F is represented polygonally by using\ninstantaneous helical motions to exactly determine the line of contact\nbetween F and Y.\nApplying concepts of differential geometry allows a better and more\nefficient approximation of tool paths. Tool paths are explicitly calculated\nwhen a design surface G is to be milled along prescribed curves.\nWe also describe how to quickly determine a polygonized representation of\nthe truncated material during the milling process by means of\n'G-buffering'. This polygon-oriented algorithm is perfectly suitable for\nBoolean subtractions and error assessment.",
"authors_et_al": false,
"substitute": null,
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"repositum_presentation_id": null,
"authors": [
420,
166
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"number": "TR-186-2-97-10",
"pages_from": "1",
"pages_to": "11",
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"keywords": [
"G-Buffer",
"sweeps",
"solid modeling",
"NC-verification",
"NC-milling",
"computer aided manufacturing"
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{
"id": "Loeffelmann-1997-FV2",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Fast Visualization of 2D Dynamical Systems\n by the use of Virtual Ink Droplets",
"date": "1997-04",
"abstract": "This paper presents a new visualization technique for\nflow fields in 2D. It utilizes a physical model of smearing ink over a\nsheet of paper as an intuitive metaphor for the representation of a\ndynamical system. This technique is capable of producing images that are\ncomparable to those generated with line integral convolution (LIC),\nwhich is a well-known and established visualization technique for planar\nvector fields. Similar to oriented line integral convolution (OLIC), an\nextension to LIC, the virtual ink droplet method is capable of\nvisualizing not only direction and velocity of flow (as LIC does), but\nalso the orientation of vectors. The main advantage of the new method\nis, that animation sequences, which intuitively represent the dynamics\ninduced by the underlying dynamical system, can be computed much more\nefficiently than by the use of LIC or OLIC. A speed-up of about 200 is\nusually achieved when virtual ink droplets are used instead.",
"authors_et_al": false,
"substitute": null,
"main_image": null,
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"repositum_presentation_id": null,
"authors": [
399,
197,
166
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"number": "TR-186-2-97-13",
"pages_from": "1",
"pages_to": "8",
"research_areas": [],
"keywords": [
"visualization",
"dynamical systems",
"flow visualization"
],
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{
"id": "Loeffelmann-1997-VPM",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Visualizing Poincare Maps together with the\n\t\tunderlying flow",
"date": "1997-03",
"abstract": "We present a set of advanced techniques for the\nvisualization of 2D Poincare maps. Since 2D Poincare\nmaps are a mathematical abstraction of periodic or\nquasiperiodic 3D flows, we propose to embed the\n2D visualization with standard 3D techniques to improve the\nunderstanding of the Poincare maps. Methods to enhance\nthe representation of the relation $x\\leftrightarrow{}P(x)$,\ne.g., the use of spot noise, are presented as well as\ntechniques to visualize the repeated application of $P$,\ne.g., the approximation of $P$ as a warp function. It is\nshown that animation can be very useful to further improve\nthe visualization. For example, the animation of the\nconstruction of Poincare map $P$ is inherently a proper\nvisualization. During the paper we present a set of\n examples which demonstrate the usefulness of our techniques.",
"authors_et_al": false,
"substitute": null,
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"authors": [
399,
152,
166
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"number": "TR-186-2-97-06",
"pages_from": "1",
"pages_to": "17",
"research_areas": [],
"keywords": [
"Poincare maps",
"dynamical systems",
"visualization"
],
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{
"id": "Wegenkittl-97-FOL",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Fast Oriented Line Integral Convolution for Vector\n Field Visualization via the Internet",
"date": "1997-03",
"abstract": "Oriented Line Integral Convolution (OLIC) illustrates\nflow fields by convolving a sparse texture with an anisotropic\nconvolution kernel. The kernel is aligned to the underlying flow of\nthe vector field. OLIC does not only show the direction of the flow\nbut also its orientation. This paper presents Fast Rendering of Oriented\nLine Integral Convolution (FROLIC), which is approximately two orders of\nmagnitude faster than OLIC. Costly convolution operations as done in\nOLIC are replaced in FROLIC by approximating a streamlet through a set\nof disks with varying intensity. The issue of overlapping streamlets\nis discussed. Two efficient animation techniques for animating FROLIC\nimages are described. FROLIC has been implemented as a Java applet.\nThis allows researchers from various disciplines (typically with\ninhomogenous hardware environments) to conveniently explore and\ninvestigate analytically defined 2D vector fields.",
"authors_et_al": false,
"substitute": null,
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"authors": [
165,
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"number": "TR-186-2-97-07",
"pages_from": "1",
"pages_to": "14",
"research_areas": [],
"keywords": [
"vector field visualization",
"Line Integral Convolution"
],
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{
"id": "Wegenkittl-97-VBH",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Visualizing the Behavior of Higher Dimensional\n Dynamical Systems",
"date": "1997-03",
"abstract": "In recent years scientific visualization has been\ndriven by the need to visualize high-dimensional data sets within\nhigh-dimensional spaces.\nHowever most visualization methods are designed for showing some\nstatistical features of the data set. This paper deals with the\nvisualization of trajectories of high-dimensional dynamical systems\nwhich form a L^n_n data set of a smooth n-dimensional flow. Three\nmethods that are based on the idea of parallel coordinates are\npresented and discussed. Visualizations done with these new methods\nare shown and an interactive visualization tool for the exploration\nof high-dimensional dynamical systems is proposed.",
"authors_et_al": false,
"substitute": null,
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"authors": [
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399,
166
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"number": "TR-186-2-97-08",
"pages_from": "1",
"pages_to": "12",
"research_areas": [],
"keywords": [
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"multi-dimension visualization"
],
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{
"id": "Loeffelmann-1997-HSV",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Hierarchical Streamarrows for the Visualization of\n Dynamical Systems",
"date": "1997-01",
"abstract": "Streamarrows are a technique to enhance the use of\nstreamsurfaces by separating arrow-shaped portions from the\nremaining streamsurface. We present a hierarchical streamarrows\nalgorithm as an extension to this technique: Streamarrows are\nlocally chosen from a stack of scaled streamarrows textures to\navoid too big or small streamarrows in the rendered image. We\nfurthermore present techniques how streamarrows can be extended\ninto 3D, namely perpendicular to the streamsurface: streamarrows\ncan be shifted slightly out of the streamsurface. Another\nextension in this category is to represent the outline of\nstreamarrows as 3D tubes. We show a set of images which have been\n rendered using this technique and report about ongoing research.",
"authors_et_al": false,
"substitute": null,
"main_image": null,
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"authors": [
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184,
166
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"number": "TR-186-2-97-02",
"pages_from": "1",
"pages_to": "13",
"research_areas": [],
"keywords": [
"streamsurfaces",
"visualization",
"dynamical systems"
],
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},
{
"id": "Wegenkittl-1996-AFR",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Animating Flowfields: Rendering of Oriented Line Integral\n\t\tConvolution",
"date": "1996-12",
"abstract": "Line Integral Convolution (LIC) is a common approach\nfor the visualization of vector fields. It is well suited for visualizing\nthe direction of a flow field, but it gives no information about the\norientation of the underlying vectors. We introduce Oriented Line Integral\nConvolution (OLIC), where direction as well as orientation are encoded\nwithin the resulting image. This is achieved by using a low frequency\ninput texture and a ramp like (unisotropic) convolution kernel. This\nmethod can be animated, whereby the computation of so called pixel traces\nfastens the calculation process. In the result section various OLICs using\nsimple and real-world vector fields are shown.",
"authors_et_al": false,
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165,
166,
190
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"number": "TR-186-2-96-23",
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"keywords": [
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{
"id": "Wegenkittl-1996-SDI",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Simulation of Differential Interferometry and\n Comparison with Experimental Results",
"date": "1996-11",
"abstract": "This paper presents the computational simulation of a\ndifferential interferometer in a Mach-Zehnder arrangement\nwith objects located outside the center of the\ninterferometer. The computer simulation corresponds very\nwell to an experimental setup. This is illustrated for\nseveral basic phase objects. The theoretical models of\nthese objects are discussed. The concept of an interactive\nvisualization system for the analysis of phase objects is\npresented and finallysome results allowing a comparison\n between experimental and simulated interferograms are shown.",
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165,
166,
423
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"number": "TR-186-2-96-22",
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"id": "Loeffelmann-1996-DS3",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "DynSys3D: A workbench for developing advanced\nvisualization techniques in the field of\n three-dimensional dynamical systems",
"date": "1996-11",
"abstract": "This work describes DynSys3D, a framework for testing and\nimplementing visualization techniques in the area of three-dimensional\ndynamical systems. DynSys3D has been designed to meet requirements which\nallow a fast and modular investigation of dynamical systems. Such\nrequirements are, e.g., extendability, interactivity, and symmetry. Some\nvisualization examples realized with DynSys3D illustrate the flexibility of\nthe system.",
"authors_et_al": false,
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"authors": [
399,
166
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"number": "TR-186-2-96-21",
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{
"id": "loeffelmann-1996-CVA",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Classifying the Visualization of Analytically Specified\n Dynamical Systems",
"date": "1996-04",
"abstract": "In this paper we suggest a classification of visualization\ntechniques for analytically specified dynamical systems\ninto four different approaches. We distinguish between local\nproperties, the topology of behavior, global properties, and\nclasses of dynamical systems with respect to various topics\nof visualization. By presenting advanced visualization\ntechniques that we applied during three recent projects, we\ndiscuss their embedding within the classification scheme The\ndynamical systems visualized are the ``Dynastic Cycle'',\nwhich is a model for rise and fall of dynasties in ancient\nChina, the ``Wonderland'' model, that simulates the\ninteractions of population growth, economic activities, and\nenvironmental pollution, and a model for mixed-mode\n oscillations, which occurs in chemistry. ",
"authors_et_al": false,
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"authors": [
399,
166,
165,
190
],
"number": "TR-186-2-96-15",
"pages_from": "1",
"pages_to": "14",
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"keywords": [
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{
"id": "loeffelmann-1996-SVM",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Streamarrows: Visualizing Multiple Layers of\n Streamsurfaces",
"date": "1996-04",
"abstract": "Occlusion is a crucial spatial cue for the human visual\nsystem. Painters as well as researchers in the field of\ncomputer graphics have been dealing with this aspect for a\nlong time. In the field of visualization occlusion can be\nespecially problematic. We present a new approach to\ndealing with streamsurfaces that occlude major parts of the\nsystem representation. Analyzing mixed-mode oscillations,\nwhich are a special class of analytically defined dynamical\nsystems, we came across geometrically complex streamsurfaces\nwith curly shape. Certain regions of these surfaces, that\nare necessary to describe the behavior of the system,\nocclude major parts of the model. We combined and adopted\nseveral visualization techniques to deal with this problem.\nStreamarrows, which are semi-transparent portions of the\nstreamsurface, allow the viewer to see through and diminish\nthe problem of occlusion. Cross-sections and the removal\nof certain portions of the model reduce occlusion as well\nand thus improve visual perception. Choosing the shape of\nan arrow for segmentation allows to visualize even more\ninformation at the streamsurface, e.g., the direction of\nthe flow. An anisotropic spot noise texture is further\nused to emphasize flow within a streamsurface. Finally\nanimation techniques were applied to facilitate the\ninterpretation of dynamical systems with complex shaped\n streamsurfaces.",
"authors_et_al": false,
"substitute": null,
"main_image": null,
"sync_repositum_override": null,
"repositum_presentation_id": null,
"authors": [
399,
184,
166,
190
],
"number": "TR-186-2-96-12",
"pages_from": "1",
"pages_to": "13",
"research_areas": [],
"keywords": [
"flow visualization",
"streamsurfaces",
"complex dynamical systems",
"mixed-mode oscillations"
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{
"id": "wegenkittl-1996-GTW",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "A Guided Tour to Wonderland: Visualizing the Slow-Fast\n Dynamics of an Analytical Dynamical System",
"date": "1996-04",
"abstract": "The analysis of complex dynamical systems produces large\namounts of data that have to be interpreted efficiently.\nVisualizing the phase space of such systems illustrates\ngeometrically the behavior of the underlying dynamics. This\nwork investigates the visualization of Wonderland, a four\ndimensional econometric model, which describes interactions\nbetween population growth, economic activity and\nenvironmental implications. Wonderland belongs to a class\nof interesting dynamical systems with a pronounced\nslow-fast dynamics, i.e., some variables are changing much\nfaster than others. Furthermore the behavior of the\nWonderland model is characterized by manifolds which are\nnot streamsurfaces, i.e., the flow does not stay within\nthese surfaces. This paper discusses the application and\nadaptation of various visualization techniques to\nanalytical dynamical systems with special properties as\n mentioned above.",
"authors_et_al": false,
"substitute": null,
"main_image": null,
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"authors": [
165,
166,
190
],
"number": "TR-186-2-96-11",
"pages_from": "1",
"pages_to": "12",
"research_areas": [],
"keywords": [
"vector field visualization",
"complex dynamical systems"
],
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},
{
"id": "groeller-1996-ACE",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Autostereograms - Classification and Experimental\n Investigations",
"date": "1996-03",
"abstract": "One important branch in computer graphics is the research\nfor representing three-dimensional objects. Many different\ntechniques have been developed to convey to a user of a\ntwo-dimensional medium that he sees a three-dimensional\nscene. Apart from realistic image synthesis, e.g., ray\ntracing and radiostiy, there are techniques which try to\ngenerate a real three-dimensional impression for the viewer.\nIn the last years a new technique to produce such pictures\nhas gained popularity. The generated images are called\nautostereograms. An interesting feature with this technique\nis, that only single pictures have to be produced and that\nno additional equipment is needed to produce a three\ndimensional impression. Therefore autostereograms are also\ncalled 'single image stereograms' (SIS). This work gives an\noverview on the technique of autostereograms. After a short\ndescription of the algorithms to generate autostereograms a\ndetailed classification is introduced. After that the\nperceptability of autostereograms and software related to\nthe topic is discussed. Moreover, experiments with animated\nautostereograms will be presented. Finally some experiments\nconcerning the usage and change of colors in autostereograms\nand the combination of two depth-scenes within one image\n will be discussed.",
"authors_et_al": false,
"substitute": null,
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"authors": [
428,
166
],
"number": "TR-186-2-96-09",
"pages_from": "1",
"pages_to": "9",
"research_areas": [],
"keywords": [
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],
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{
"id": "groeller-1996-avn",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Analysis and Visualization of Nonlinear Time Sequences",
"date": "1996-01",
"abstract": "During the last years there has been a considerable\nincrease in the interest in nonlinear dynamical systems.\nMore and more scientists apply nonlinear techniques to\nanalyze their data sets which are often given as discrete\ntime sequences. This paper gives a short overview on\nnonlinear systems and time sequences resulting from such\nnonlinear systems. The concept of attractors is explained\nand Poincare maps are described. The analysis of time\nsequences is discussed with respect to applying\nvisualization techniques as steering tools in the\ninvestigation process. Because discrete time sequences\nresulting from measurements are typically affected by noise\na signal - noise separation has to be done. The method of\ntime delays is then subsequently used for phase-space\nreconstruction. Important numbers to characterize dynamical\nsystems are fractal dimension and Lyapunov exponents. These\nconcepts are therefore treated as well. A low cost\nvisualization system (AVTS) was implemented which is\ndesigned to specifically support a researcher in his\ninvestigation of nonlinear time sequences. Emphasis has\nbeen put on handling of large data sets, as well as fast\ninteractive manipulation and visual representation of time\nsequences. The visual inspection with AVTS allows the\nresearch to quickly focus his investigation on interesting\n portions of the data.",
"authors_et_al": false,
"substitute": null,
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"authors": [
429,
166
],
"number": "TR-186-2-96-05",
"pages_from": "1",
"pages_to": "10",
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"keywords": [
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"Time Sequences",
"Nonlinearity",
"Fractal Dimension"
],
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{
"id": "Groeller-1995-GOW",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "The Geometry of Wonderland",
"date": "1995-12",
"abstract": "We analyze Wonderland - a model of demographic,economic\nand environmental interactions\n- by combining numerical simulations with basic ideas of\ngeometric singular perturbation theory. This theory dealing\nwith slow-fast dynamical systems helps us to gain new\ninsights into the system's behaviour. We give conditions\nfor the occurrence of rapid environmental changes in\nWonderland. Since the chosen approach is inherently geometric\n\t\twe also focus on the visualization of our results.",
"authors_et_al": false,
"substitute": null,
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"authors": [
166,
165,
417,
430,
431,
432
],
"number": "TR-186-2-95-17",
"pages_from": "1",
"pages_to": "21",
"research_areas": [],
"keywords": [
"dynamical system",
" visualization"
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{
"id": "Groeller-1995-SDC",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Simulation und Darstellung computergenerierter Strickware",
"date": "1995-11",
"abstract": "In Computer Graphics a boundary representation of objects\nis often used to generate realistic synthetic images. For\ncertain objects it is more suitable to use a volume\nrepresentation. In this paper we investigate the\nvisualization of knitting patterns where the details\nof the yarn were modeled by voxel data. The visualization\nand the modeling of textiles has already been investigated\nin depth in the computer graphics literature. However most\nof the publications consider woven fabrics. In the case of\nknitwear the topological specification of the knitting\npattern allows a subdivision into basic elements. The thread\ncourse and the microstructure of the yarn are then\napproximated by voxel data. The periodic structure of\nknitting patterns allows for a compact representation and\nan efficient rendering. The generated images demonstrate the\n\t\tpossible realistic simulations. ",
"authors_et_al": false,
"substitute": null,
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"authors": [
166,
433,
434
],
"number": "TR-186-2-95-15",
"pages_from": "1",
"pages_to": "9",
"research_areas": [
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],
"keywords": [
"knitwear",
"volume visualization",
"textile modeling"
],
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{
"id": "jankovic-1995-heter",
"type_id": "inproceedings",
"tu_id": null,
"repositum_id": null,
"title": "Heterogenous Morphing of Multimodal Medical Information",
"date": "1995-09",
"abstract": "",
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"authors": [
444,
482,
166
],
"booktitle": "Proceedings of the 6th International Conference on Computer Analysis of Images and Patterns",
"date_from": "1995-09-06",
"date_to": "1995-09-08",
"editor": "Hlavac, Vaclav; Sara, Radim",
"isbn": "3-540-60268-2",
"location": "Prague, Czech Republic",
"publisher": "Springer",
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"url": "https://www.cg.tuwien.ac.at/research/publications/1995/jankovic-1995-heter/",
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{
"id": "Acquisto-1995-DCR",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "A Distortion Camera for Ray Tracing",
"date": "1995-03",
"abstract": "Ray tracing is a powerful technique for realistic image\ngeneration. Typically a simple camera definition is used,\nwhereby a 3D environment is mapped onto an image plane\neither by an orthographic or perspective projection. The\nconcept of the usual simple camera definition is extended\nin several ways to achieve distorted views or projections\nof the object scene. The origins of primary rays are not\nrequired to lie on a plane anymore. Thus projections onto\ncurved image surfaces are possible. The directions of\nprimary rays may be chosen according to various nonlinear\nfunctions that allow nonstandard projections of the\nenvironment. The concept of centers of interest (coins) is\nintroduced that enables to concentrate on especially\ninteresting portions of object space. A center of interest\nis a 3D position that either distorts (attracts) a portion\nof the image surface or locally influences the directions\nof primary rays. The results of a test implementation are\npresented to show the feasibility of the methods presented.\nSeveral applications of distorted images are: creating\nelemental holographic images and raster omnimax images,\n\t\tvirtual reality and arts.",
"authors_et_al": false,
"substitute": null,
"main_image": null,
"sync_repositum_override": null,
"repositum_presentation_id": null,
"authors": [
438,
166
],
"number": "TR-186-2-95-05",
"pages_from": "",
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"keywords": [
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"distortion camera",
"projection",
"image generation"
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{
"id": "Groeller-1995-CCG",
"type_id": "techreport",
"tu_id": null,
"repositum_id": null,
"title": "Coherence in Computer Graphics",
"date": "1995-03",
"abstract": "Coherence denotes similarities between items or entities.\nIt describes the extent to which these items or entities\nare locally constant. An introduction to coherence and a\nsurvey of various types of coherence, that are used in\ncomputer graphics, are given. Techniques and data\nstructures for exploiting coherence in computer graphics\nare described. Incremental techniques, bounding volume\nschemes, subdivision techniques and several geometric data\nstructures are discussed in more detail. Applications of\ncoherence principles to computer graphics are treated and\n\t\ta survey of previous research is done.",
"authors_et_al": false,
"substitute": null,
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"authors": [
166,
190
],
"number": "TR-186-2-95-04",
"pages_from": "1",
"pages_to": "19",
"research_areas": [],
"keywords": [
"coherence",
"computer graphics",
"incremental techniques",
"bounding volumes",
"subdivision"
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"abstract": "This paper presents an extension of the camera module for ray\ntracers. As an alternative to the standard pinhole camera an\nAbstract Camera Machine is introduced, which represents a\ngeneralization of the camera module at an abstract level. The\nAbstract Camera Machine itself is based on simple\ntransformations and mappings, which are chosen from a large\nset of representatives. They are integrated as sub-modules\nto complete the camera mapping procedure, which generates\nrays out of image locations (pixels). Depending on what type\nof transformations are used, many different extended cameras\ncan be built. The structure of the Abstract Camera Machine\nand an overview of the transformations and mappings are\ngiven. Some results, which were rendered by using a public\ndomain ray tracer in combination with the extended cameras,\nare presented as well. They show the feasibility of this\napproach and give an impression of the areas of application\nfor this extension to the camera module. Using extended\ncameras it is easily possible to produce special and artistic\neffects, e.g., a local zoom of especially interesting\nregions. Overviews of given scenes can be modelled and\nseveral views of the same object can be integrated into one\npicture, e.g., a building could be shown from the inside\n\t\t and the outside simultaneously.",
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"title": "Visualization of Local Stability of Dynamical Systems",
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"abstract": "Several methods for visualizing local stability\nproperties of dynamical systems are presented. The\ncalculation of characteristic values of local stability\nfor linear and nonlinear systems is discussed. Two\nprinciples of visualizing local stability are introduced.\nThe first principle is to display the estimated stability\nvalues directly by using scaled spheres or vectors. The\nsecond principle uses numerical analysis which generates\nportions of sweeps, that are deformed in dependence of local\n\t\t stability properties.",
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"title": "Interactive Exploration of Dynamical Systems",
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"abstract": "Nonlinear deterministic dynamical systems often exhibit\ncomplex and chaotic behavior which is difficult to\ncomprehend. Visualizing the characteristics of such systems\nis therefore essential for an understanding of the underlying\ndynamics. In this paper concepts for the interactive\ngraphical exploration of analytically defined dynamical\nsystems are discussed. Emphasis is put on interactivity which\nshall facilitate the investigation and exploration of such\nsystems. The following topics on dynamical systems are\ntreated in more detail: interactive specification, simple and\nfast graphical representation, and interactive modification.\nThe paper concentrates on 2D and 3D orthographic projections\nof higher-dimensional phase spaces and on the display of\nbifurcation diagrams. A prototype software system which\nincorporates the previously presented ideas is shortly\ndiscussed. The software system is intended to offer a quick\ninsight into the dynamics of a dynamical system and to enable\n\t\tfast investigation of variations of a dynamical system.",
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"id": "fischel-1995-vis",
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"title": "Visualisierung für das lokale und globale Verhalten komplexer dynamischer Systeme",
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"date_to": "2005-10-05",
"event": "Workshop Visualisierung im Rahmen des DFG-Schwerpunktes ",
"location": "Feldberg, BRD",
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"title": "Modeling and Visualization of Knitwear",
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"title": "Attract - Interactive Visualization of\n Dynamical Systems",
"date": "1994-11",
"abstract": "An interactive program for visualizing the long\nterm behavior of dynamical systems, e.g., attractors\nand bifurcation diagrams, is presented. The program\nallows an easy specification of a set of formulas and\nconstants which describe a dynamical system. This set\nof equations is then used for displaying the\ngeometrical structure of the long term development of\nthe dynamical system. The user defines the assignment\nof variables of the dynamical system to at most three\nspatial axes and one color axis. Viewing parameters,\ne.g., point of view, zoom, rotation angle, can again\nbe changed interactively. The program is intended to\nprovide researchers working on dynamical systems with\n a fast visual analysis and experimentation tool.",
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"id": "Groeller-1994-HIS",
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"title": "Hyperrealistic Image Synthesis and Manipulation",
"date": "1994-11",
"abstract": "Computer graphics techniques allow the generation\nof realistic and hyperrealistic images. Some of\nthese techniques are discussed in this paper. Ray\ntracing and radiosity produce 2D images out of a 3D\nsynthetic object description. Two extensions of the\nray tracing technique (nonlinear ray tracing, extended\ncamera specification) are described. Finally image\nwarping and image morphing which manipulate 2D images\n to produce modified 2D images is dealt with.",
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"note": "TALK: 3.11.1994",
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"id": "Groeller-1994-MRN",
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"title": "Modeling and Rendering of Nonlinear Iterated\n Function Systems",
"date": "1994-11",
"abstract": "Iterated Function Systems are typically defined\nthrough sets of contractive linear transformations.\nThe theory of Iterated Function Systems is based on\nthe contractivity but not on the linearity of the\ndefining functions. Piecewise bilinear distortions\nof grids are used in this work to specify nonlinear\nIterated Function Systems. Nonlinear Iterated Functions\nSystems are characterized by a higher degree of\nflexibility and greater modeling capability than their\nlinear counterparts. Modeling and rendering aspects are\ndiscussed. Limit sets of 2D nonlinear Iterated Function\nSystems are represented by approximating point sets.\nLimit sets of 3D nonlinear Iterated Function Systems\nare either rendered by displaying approximating point\nsets (z-buffer approach) or through ray tracing an\napproximate set of 3D solids. Example images of a\n test implementation are presented.",
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"title": "Parameterizing Superquadrics",
"date": "1994-11",
"abstract": "Superquadrics are well known and often used 3D\nsurface objects in computer graphics. They are used\nfor modelling parts of scenes that are then rendered\nusing photorealistic image synthesis algorithms (e.g.,\nray tracing). For some techniques, like texturing,\nwhich are part of these rendering methods, the type\nof the parameterization of such a surface has to be\nchosen carefully and is not intuitively obvious at\nfirst sight. There are cases, where the straight\nforward extension of quadric parameterizations to\nsuperquadrics do not produce satisfying results. We\ntherefore investigate a number of different\nparameterizations in combination with the\ncorresponding formulas, and point out some\n significant differences between them.",
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"title": "Interactive Design of Nonlinear Functions for\n Iterated Function Systems",
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"abstract": "The basic requirement for the functions of an Iterated\nFunction System (IFS for short) is contractivity.\nNevertheless the majority of recent scientific investigations\nis concentrating on IFSs defined through a set of contractive\nlinear functions. Simpler handling of this kind of functions\nand a more predictable result is the main reason for this\napproach. In this work we use distorted grids (representing\nnonlinear functions) to specify an IFS with a higher degree\nof flexibility and a higher modelling capability. A program\nfor modeling these grids with so-called high-level operations\nis presented. Attention is directed to the interactivity of\ndesigning the IFS and rendering its limit set. Therefore a\nz-Buffer for displaying the result of a stochastic algorithm\nis included. Example images designed with the implemented\n\t\tsoftware system are presented.",
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"title": "A Collection of Papers of the Institute of Computer\n Graphics",
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"title": "Application of Visualization Techniques to\n Complex and Chaotic Dynamical Systems",
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"title": "Interactive Transformation of 2D Vector Data",
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"abstract": "A program for the interactive transformation of 2D\nvector data is presented. The program allows the\ndefinition of local and global transformations to\nestablish a matching between two data sets. Zoologists\ndeduce relationships between life forms by\ninvestigating their geometric shape. The presented\nprogram enables the investigation of 2D cross-sections\nof, e.g., insect bodies. The amount of the distortion\nrequired to map one cross-section onto another\nillustrates evolutionary links among different species.\nThe program is intended to facilitate the above\n mentioned research activities.",
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"title": "Physically Based Matching of Multimodal Medical\n Information",
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"abstract": "The paper presents a general non-rigid body\nrepresentation suitable for physically-based\nmodeling of deformations of inhomogenious objects.\nThe reliability of the obtained results is\ndemonstrated on real medical data sets - CT an MR\n scans of human brain.",
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"title": "Physically Based Matching of Multimodal Medical Information",
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"title": "Application of Visualization Techniques to Complex and Chaotic Dynamical Systems",
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"note": "TALK: E. Gröller 19.9.1994",
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"title": "Coherence in scan-line algorithms for CSG",
"date": "1994-01",
"abstract": "Scan-line algorithms for visibility calculation\nexploit various types of coherence properties.\nSeveral scan-line algorithms for Constructive\nSolid Geometry (CSG) are discussed. In one approach\nCSG primitives are represented by polygonal\napproximations. Another technique processes CSG\nprimitives as general quadric surfaces. We\ninvestigate the handling of frequently occurring\nquadric surfaces (cube, cone, sphere, cylinder)\nas distinct cases. Thus the differing properties\nof such objects can be used more efficiently than a\nuniform approach would allow. A so called eBRep\n(extended Boundary Representation) is defined for\nthe frequently occurring quadric surfaces. An eBRep\nis an exact representation of a quadric object and\ncontains curved edges and faces. For each of the\nabove mentioned quadric surfaces a different, geometry\ndependent eBRep is specified. A comparison between the\npolygon-based scan-line algorithm for CSG and our\neBRep based approach is done. eBRep is a storage\nefficient exact representation of quadric surfaces,\n well suited for scan-line visibility determination.",
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"title": "Techniken der Computergraphik zur Analyse dynamischer Systeme",
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