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Item Visualizing Local Weather Characteristics Interpreted from Glider GPS Flight Logs(The Eurographics Association, 2011) Hsieh, Tung-Ju; Kuester, Falko; Hutchinson, Tara; Bing-Yu Chen and Jan Kautz and Tong-Yee Lee and Ming C. LinVisualization can aid in improving the validation and evaluation of glider flight logs, which in turn can make the logs more meaningful in flight evaluation and planning. This paper presents techniques to interpret and visualize local weather characteristics derived from glider flight logs. Although glider flight logs only contain discretely sampled position and elevation records, local weather characteristics such as thermal lift and wind velocity can be interpreted from the temporal and spatial components in the logs. A total number of 397 flight logs were used in this study, statistics were performed to identify strong thermal locations, maximum flight altitudes, and weather patterns along flight routes. When the derived thermal features are geo-referenced with 3D terrain models, results support post-flight evaluation and pre-flight planning. For a given flight task, the pilot can derive an optimal flight path based on the presented visualization techniques and the statistics obtained from the historical records.Item Point Cloud Segmentation for Cultural Heritage Sites(The Eurographics Association, 2011) Spina, Sandro; Debattista, Kurt; Bugeja, Keith; Chalmers, Alan; Franco Niccolucci and Matteo Dellepiane and Sebastian Pena Serna and Holly Rushmeier and Luc Van GoolOver the past few years, the acquisition of 3D point information representing the structure of real-world objects has become common practice in many areas. This is particularly true in the Cultural Heritage (CH) domain, where point clouds reproducing important and usually unique artifacts and sites of various sizes and geometric complexities are acquired. Specialized software is then usually used to process and organise this data. This paper addresses the problem of automatically organising this raw data by segmenting point clouds into meaningful subsets. This organisation over raw data entails a reduction in complexity and facilitates the post-processing effort required to work with the individual objects in the scene. This paper describes an efficient two-stage segmentation algorithm which is able to automatically partition raw point clouds. Following an intial partitioning of the point cloud, a RanSaC-based plane fitting algorithm is used in order to add a further layer of abstraction. A number of potential uses of the newly processed point cloud are presented; one of which is object extraction using point cloud queries. Our method is demonstrated on three point clouds ranging from 600K to 1.9M points. One of these point clouds was acquired from the pre-historic temple of Mnajdra consistsing of multiple adjacent complex structures.Item Shape Capture Assisted by Traditional Tools(The Eurographics Association, 2007) Rushmeier, Holly; Xu, Chen; Wang, Bing; Rushmeier, Russell; Dorsey, Julie; D. Arnold and F. Niccolucci and A. ChalmersWe present new techniques for capturing the shape of physical objects using simple tools. From a set of caliper distance measurements between object points, we reconstruct a three dimensional structure. We show that we can refine the model using planar contours obtained with a gage that are placed in three dimensions using the caliper measurements. We demonstrate that the model we construct can be used to assist optical approaches for model capture.Item Geological Storytelling - Graphically Exploring and Communicating Geological Sketches(The Eurographics Association, 2012) Lidal, Endre M.; Hauser, Helwig; Viola, Ivan; Karan Singh and Levent Burak KaraDeveloping structural geological models from exploratory subsea imaging is difficult and an ill-posed process. Therefore, in practice several experts generate a larger number of geological interpretations. This leads to the situation that a number of geological sketches are prepared and examined for the next steps in the oil and gas exploration pipeline. In this paper, we present Geological Storytelling, a novel graphical approach for performing rapid and expressive geomodeling of a multitude of model variations. The solution builds on a flip-over metaphor for sketching the individual steps in a story that externalizes the mental steps the modeler performs when developing the model. The stories, through the discrete story steps, are then visualized in a Story Tree for easy access and management. This tree also provides the interface for individual story playback and examination, or comparative visualization of several stories. With our approach, the experts can rapidly sketch geological stories that both visualize the proposed model of today's geology and visualize how the expert derived this model. Presenting the model as a visual story helps the peers to evaluate the geological soundness of the model. We have developed geological storytelling in collaboration with domain experts that work with such challenges on a daily basis. Our focus of this work has been on models derived from single seismic slices. We have implemented a prototype of Geological Storytelling to demonstrate our concept and to get domain expert feedback.Item Image-based Animation of Clothes(The Eurographics Association, 2012) Hilsmann, Anna; Eisert, Peter; Carlos Andujar and Enrico PuppoWe propose a pose-dependent image-based rendering approach for the visualization of clothes with very high rendering quality. Our representation combines body-pose-dependent geometry and appearance. A geometric model accounts for low-resolution shape adaptation, e.g. animation and view interpolation, while small details as well as complex shading/reflection properties are accounted for through numerous images. Information on shading, texture distortion and silhouette at fine wrinkles are extracted from the images to allow later texture replacement. The image-based representations are estimated in advance from real samples of clothes captured in an offline process, thus shifting computational complexity into the training phase. For rendering, pose dependent geometry and appearance are interpolated and merged from the stored representations.Item Using Visualisation Techniques and Molecular Dynamics to Study Atoms Diffusing in Glass(The Eurographics Association, 2011) Flikkema, E.; Zhou, Z.; Greaves, G. N.; R. Laramee and I. S. LimIn this poster, virtual reality and visualisation techniques are used to interpret the output of Molecular Dynamics simulations. In particular, mixtures of sodium-disilicate and potassium-silicate are studied. In such systems, the silicon and oxygen atoms form a disordered network. The alkali atoms are relatively mobile and will diffuse through channels in the silica network. This behaviour is rationalised by considering the concept of accessible free volume .Item Visual Analysis of Public Transport Vehicle Movement(The Eurographics Association, 2012) Wörner, Michael; Ertl, Thomas; Kresimir Matkovic and Giuseppe SantucciPublic transport vehicles record detailed operational logs. In major networks, this quickly amounts to massive datasets. Traditionally, these are analysed only using statistical tools, yet they show great potential for the successful application of visual analytics techniques and the integration of different visualizations in order to improve service quality and passenger comfort. We present a visual analytics tool for the analysis of such data and apply it to a real-world dataset of actual public transport vehicle movements.Item CrystalExplorer: An Interactive Knowledge-Assisted System for Visual Design of Solar Cell Crystal Structures(The Eurographics Association, 2012) Aboulhassan, Amal; Li, Ruipeng; Knox, Christopher; Amassian, Aram; Hadwiger, Markus; Miriah Meyer and Tino WeinkaufsCrystallography is a key research tool in materials science. The chemical properties of materials are often controlled by the geometric properties of crystals. Accordingly, visualizing the 3D structure of crystals is an important task in materials exploration. The current crystallography visualization systems are limited by focusing on the visualization of pre-defined crystal structures, and a lack of capabilities for editing and exploring different variations and levels of abstraction. To remove this limitation, we propose a new paradigm for knowledge-assisted visual exploration of crystals where the user can use semantic rules to define clusters of atoms with certain geometric properties. To test the usefulness of this system, we have applied it for the design of materials for solar cells. Using our proposed system, materials scientists can interactively create and visualize structures of interest inside the crystals in a relatively short time. This could not be achieved using their previous visualization workflow.Item 3D CT Segmentation for Clinical Evaluation of Knee Prosthesis Operations(The Eurographics Association, 2006) Battiato, S.; Bosco, C.; Farinella, G. M.; Impoco, G.; S. Battiato and G. Gallo and F. StancoIn surgical knee replacement, the damaged knee joint is replaced with artificial prostheses. An accurate clinical evaluation must be carried out before applying knee prostheses to ensure optimal outcome from surgical operations and to reduce the probability of having long-term problems. Useful information can be inferred from CT scans of the knee area, that can be used to estimate the stress that will be acting on the prosthesis being implanted. This information can be exploited to tailor the prothesis to the patient s anatomy. We present some ideas for a system intended to help surgeons in evaluating the post-operative outcome of knee prosthesis implantation. We also show some preliminary results about the 3D segmentation of CT data, that is the main activity of our lab in the project.Item Interactive Relighting for Stage Use(The Eurographics Association, 2009) Stephenson, Ian; Wen Tang and John CollomosseRe-lighting by combining images taken under known lighting conditions to synthesise new lighting configurations is a simple, but powerful technique capable of producing impressive results. However it has found little practical application. Here we demonstrate the integration of a relighting tool into a typical theatrical lighting system, to provide real time previews both offline when the stage is unavailable, and during performance.