EG 2013 - Short Papers

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https://diglib.eg.org/handle/10.2312/300

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Browsing EG 2013 - Short Papers by Subject "I.3.3 [Computer Graphics]"

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    Automatic Modeling of Planar-Hinged Buildings
    (The Eurographics Association, 2013) Garcia-Dorado, Ignacio; Aliaga, Daniel G.; M.- A. Otaduy and O. Sorkine
    We present a framework to automatically model and reconstruct buildings in a dense urban area. Our method is robust to noise and recovers planar features and sharp edges, producing a water-tight triangulation suitable for texture mapping and interactive rendering. Building and architectural priors, such as the Manhattan world and Atlanta world assumptions, have been used to improve the quality of reconstructions. We extend the framework to include buildings consisting of arbitrary planar faces interconnected by hinges. Given millions of initial 3D points and normals (i.e., via an image-based reconstruction), we estimate the location and properties of the building model hinges and planar segments. Then, starting with a closed Poisson triangulation, we use an energy-based metric to iteratively refine the initial model so as to attempt to recover the planar-hinged model and maintain building details where possible. Our results include automatically reconstructing a variety of buildings spanning a large and dense urban area, comparisons, and analysis of our method. The end product is an automatic method to produce watertight models that are very suitable for 3D city modeling and computer graphics applications.
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    Feature-preserving Direct Blue Noise Sampling for Surface Meshes
    (The Eurographics Association, 2013) Peyrot, Jean-Luc; Payan, Frédéric; Antonini, Marc; M.- A. Otaduy and O. Sorkine
    We present a new direct Poisson disk sampling for surface meshes. Our objective is to sample triangular meshes, while satisfying good blue noise properties, but also preserving features. Our method combines a feature detection technique based on vertex curvature, and geodesic-based dart throwing. Our method is fast, automatic, and experimental results prove that our method is well-suited to CAD models, since it handles sharp features and high genus meshes, while having good blue noise properties.
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    Real-Time High Fidelity Inverse Tone Mapping for Low Dynamic Range Content
    (The Eurographics Association, 2013) Banterle, Francesco; Chalmers, Alan; Scopigno, Roberto; M.- A. Otaduy and O. Sorkine
    In this paper, we present a novel parallel implementation of a high fidelity inverse tone mapping operator. Our method makes use of point based graphics to accelerate density estimation, and multi-core CPUs for extracting light sources. We show that our method can achieve real-time performance on a lower-end graphics card, with minimum loss of quality.
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    Size-Based Rendering for Lung Cancer Screening
    (The Eurographics Association, 2013) Wiemker, Rafael; Bülow, Thomas; Klinder, Tobias; M.- A. Otaduy and O. Sorkine
    We present two relevant clinical use cases for thoracic computed tomography data, where the recently introduced concept of size-based rendering can be beneficially applied to medical visualization in the context of screening for lung cancer and chronic obstructive pulmonary disease (COPD): (a) Gradual suppression of thorax and vessels for quick appraisal of the presence of pulmonary nodules. (b) Visualization of bullous versus diffuse emphysema. In the first use case, the opacity is chosen to decrease with local structure size, whereas in the second case, the opacity is chosen to increase with structure size. Both algorithms are robust in particular because they do not depend on any prior segmentation or classification. They are ideally suited for full parallelization and GPU implementation.