Posters

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Now showing 1 - 15 of 15
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    A Method for Fast Initialization of Markerless Object Tracking
    (The Eurographics Association, 2010) Maiero, Jens; Hinkenjann, Andre; Anders Hast and Ivan Viola
    In Mixed Reality (MR) Environments, the user s view is augmented with virtual, artificial objects. To visualize virtual objects, the position and orientation of the user s view or the camera is needed. Tracking of the user s viewpoint is an essential area in MR applications, especially for interaction and navigation. In present systems, the initialization is often complex. For this reason, we introduce a new method for fast initialization of markerless object tracking. This method is based on Speed Up Robust Features and paradoxically on a traditional markerbased library. Most markerless tracking algorithms can be divided into two parts: an offline and an online stage. The focus of this paper is optimization of the offline stage, which is often time-consuming.
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    A curvature based lightning model for quasi-global diffuse illumination
    (The Eurographics Association, 2010) Seipel, S.; Liu, F.; Ericsson, M.; Anders Hast and Ivan Viola
    In this paper we present extensions to local illumination models that take into account light transport and shadowmasking effects in the neighborhood of the surface point under evaluation. Central to our approach is the idea that local curvature represents geometric features in the surrounding neighborhood of this point which have an attenuating or enhancing effect regarding the diffuse illumination of this point. We introduce a lighting model that controls the amount of locally scattered light from the neighborhood based on a local curvature metric. The properties we aim at modeling with this curvature-based illumination model can be found in highly diffuse reflecting materials such as for example snow.
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    Face Fitting using a Genetic Algorithm.
    (The Eurographics Association, 2010) Hunter, D.W.; Tiddeman, B. P.; Perrett, D. I.; Anders Hast and Ivan Viola
    The ability to estimate the three-dimensional structure of a human face from a single image has many useful applications, including but not limited to the fields of face recognition, modelling and actors head replacement. Although a lot of promising techniques have been developed in this area a number of significant technical hurdles exist preventing the development of a reliable method to extract three-dimensional structure without human intervention. In this poster we present work in progress on a new technique that should overcome some of the problems associated with the current state-of-the-art methods. We intend to use Genetic Algorithms to search the face space to find a match with a given input image. We hope to show that this method will avoid local-minima problems associated with traditional gradient descent techniques as well as provide a method that locates the position, pose and shape of the face without any user interaction.
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    USER S PREFERENCE-BASED COLOR TRANSFORMATION USING INTERACTIVE GENETIC ALGORITHM
    (The Eurographics Association, 2010) Kang, Hang-Bong; Woo, Hye-Yoon; Anders Hast and Ivan Viola
    In this paper, we propose a new color transform method in the image based on the user s preferences. To obtain general preferences for color, we first divided the images into two categories as favourable and unfavourable groups based on the users evaluation. From the categorized groups of images, we compute color histograms to construct general templates for 8 primary colors. To reflect the user s own preference in the color perception, we adopted an interactive genetic algorithm. In the interactive genetic algorithm, each individual consists of three chromosomes for H, S, and V and the fitness value is computed from the user s input, which is then used as criteria to iterate Genetic Algorithm for learning the user s preference. Finally, a personalized individual is generated. By transforming the colors in the image with the personalized individual, a re-colorred image is generated according to the user own preference. Survey results show that re-colorred images from our proposed personalized color templates are more satisfying than the original images.
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    Real-Time Smoke Rendering and Light Interaction
    (The Eurographics Association, 2010) Bass, Christopher J.; Anderson, Eike Falk; Anders Hast and Ivan Viola
    In computer graphics, smoke can be represented by using particle systems. Adding shadows to particle systems can go a long way to improve visuals and realism. Our work is concerned with external shadows cast onto a particle system by an occluding object, for which shadow mapping is combined with the particle system in an implementation that uses the Graphics Processing Unit (GPU).
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    Procedural Generation of Urban Environments through Space and Time
    (The Eurographics Association, 2010) Noghani, Jeremy; Liarokapis, Fotis; Anderson, Eike Falk; Anders Hast and Ivan Viola
    Although various methods of procedurally generating cities have been proposed in recent years, the problem remains that a user desiring a city from a particular time period or country would have to make time-consuming modifications to an already existing engine to achieve acceptable results. This paper proposes a set of programmable elements that can be adjusted to accommodate for buildings from a broad range of architectural styles, which can then be incorporated into a larger engine.
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    Procedural Approach for RealisticWoven Fabric Rendering
    (The Eurographics Association, 2010) Kim, Sung-Soo; Kang, Young-Min; Namy, Seung-Woo; Anders Hast and Ivan Viola
    We present a new procedural method for photorealistic rendering of woven fabric material. The goal of our research is to provide a new procedural method that renders photorealistic woven fabric without any measured data. The proposed method models the reflectance properties of woven fabric with alternating anisotropy and yarn-level surface normal manipulation. The experimental results show the proposed method can be successfully applied to photorealistic rendering of diverse woven fabric materials.
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    Automated Astrophysical Modeling with Shape
    (The Eurographics Association, 2010) Wenger, S.; Steffen, W.; Koning, N.; Morisset, C.; Magnor, M.; Anders Hast and Ivan Viola
    Three-dimensional models of complex astrophysical objects like galaxies or planetary nebulae have numerous applications in science, education and entertainment. The large distance of these objects, however, makes it difficult to obtain depth information, and conventional image-based 3D reconstruction algorithms and modeling tools are most often not able to faithfully reproduce their structure. Modeling is therefore typically performed manually by trained astronomers using specialized tools that incorporate additional information like spectral Doppler shift measurements into the modeling process. We present an extension to one such tool, Shape, that alleviates the most tedious part of the modeling process by automatically optimizing consistency of the models with observational data. Our contribution significantly reduces the necessary time for obtaining high-quality models and will be incorporated into future releases of Shape.
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    GPU Destruction: Real-Time Procedural Demolition of Virtual Environments
    (The Eurographics Association, 2010) Morris, Derek John; Anderson, Eike Falk; Anders Hast and Ivan Viola
    We introduce a method for the real-time simulation of destructible materials for use within videogame environ- ments. Our system combines a number of existing techniques in a Graphics Processing Unit (GPU) based imple- mentation that employs procedural geometry generation to reduce content creation times while retaining artist control
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    Towards Multi-Touch Map Interaction on Tabletops: State of the Art and Design Recommendations
    (The Eurographics Association, 2010) Klompmaker, F.; Ajaj, R.; Anders Hast and Ivan Viola
    Since smartphones like the IPhone and larger setups like Microsoft s Surface appeared on the market, the use of multi-touch interaction techniques is wide spread. Multi-touch allows intuitive, easy and fast interaction in principle but highly depends on the application type used. In this paper we present a brief state of the art report in the area of multi-touch and tangible map interaction on tabletops. We figured out design recommendations that we used for our evaluation prototype called MTMap.
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    Accelerated Deterministic Simulation of X-ray Attenuation Using Graphics Hardware
    (The Eurographics Association, 2010) Vidal, Franck; Garnier, M.; Freud, N.; Létang, J.M.; John, N.W.; Anders Hast and Ivan Viola
    In this paper, we propose a deterministic simulation of X-ray transmission imaging on graphics hardware. Only the directly transmitted photons are simulated, using the Beer-Lambert law. Our previous attempt to simulate Xray attenuation from polygon meshes utilising the GPU showed significant increase of performance, with respect to a validated software implementation, without loss of accuracy. However, the simulations were restricted to monochromatic X-rays and finite point sources. We present here an extension to our method to perform physically more realistic simulations by taking into account polychromatic X-rays and focal spots causing blur.
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    Undoing Subpixel Rendering for Better Screenshots
    (The Eurographics Association, 2010) Loviscach, J.; Anders Hast and Ivan Viola
    Subpixel rendering employs the spatial layout of the red, green, and blue slices of a single square pixel on a screen to enhance the horizontal resolution. This method has become the de-facto standard for displaying text. Printed screenshots and screen magnifier software, however, reveal color seams. This is particularly vexing when screenshots are to be printed in color at a larger-than-normal scale, for instance in a tutorial article in a computing magazine. Hence, this work introduces a method for automatic correction.
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    A Framework for Simulation-Event Triggered Animations
    (The Eurographics Association, 2010) Hauck, R.; Künzler, U.; Anders Hast and Ivan Viola
    We present a generic framework which uses a CAVE virtual environment for the optimization of surgical workflows and operation room medical equipment arrangements. The framework combines an event-driven simulation with 3D character animations and focuses on the separation of the workflow logic from the geometrical representation of the 3D objects.
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    CAVER Viewer - the explorer of behaviour of tunnels in proteins
    (The Eurographics Association, 2010) Kozlíková, Barbora; Sochor, Jirí; Anders Hast and Ivan Viola
    Protein exploration in order to discover new medication has been the principal aim of biochemists. In combination with informatics the solution of this task can be faster, more accurate and also more intuitive and straightforward in comparison with traditional methods. Our CAVER Viewer application allows the exploration of protein structures and the visualization of results. It enables to find certain paths from the outer space around the molecule to the specific site inside the protein called the active site. The existence of these important paths (also called tunnels or channels) is crucial in the process of transferring some small molecule of substrate into this active site. Namely, the substrate enters the active site via these precomputed tunnels. There the chemical reaction between the substrate and protein can undergo. The product of this reaction can form the basis of a new medication. This poster describes the key aim of our research in the field of protein visualization, when we have to visualize the protein dynamics - movements of the molecule as well as the behaviour of its tunnels in time space.
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    Efficient Free Path Sampling in Inhomogeneous Media
    (The Eurographics Association, 2010) Szirmay-Kalos, László; Tóth, Balázs; Magdics, Milán; Csébfalvi, Balázs; Anders Hast and Ivan Viola
    This paper presents an efficient algorithm to sample free path in inhomogeneous participating media. The method is based on the concept of mixing virtual particles to the medium, that complete the extinction coefficient to a piece-wise constant function. We use the sampling formulae developed for piece-wise homogeneous medium, but decide randomly whether a real or a virtual particle is hit.