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View and Time Interpolation in Image Space

computer graphics FORUM 2008年第7期27卷 1781-1787页

作者： Stich, Timo Linz, Christian Albuquerque, Georgia Magnor, Marcus TU Braunschweig Comp Graph Lab Braunschweig Germany

The ability to interpolate between images taken at different time and viewpoints directly in image space opens up new possiblities. The goal of our work is to create plausible in-between images in real time without the need for an intermediate 3D reconstruction. This enables us to also interpolate between images recorded with uncalibrated and unsynchronized cameras. In our approach we use a novel discontiniuity preserving image deformation model to robustly estimate dense correspondences based on local homographies. Once correspondences have been computed we are able to render plausible in-between images in real time while properly handling occlusions. We discuss the relation of our approach to human motion perception and other image interpolation techniques.

关键词： I.3.3 [computer graphics]: Bitmap and framebuffer operations

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An Interactive Design System of Free-Formed Bamboo-Copters

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computer graphics FORUM 2016年第7期35卷 323-332页

作者： Nakamura, Morihiro Koyama, Yuki Sakamoto, Daisuke Igarashi, Takeo Univ Tokyo Tokyo 1138654 Japan

We present an interactive design system for designing free-formed bamboo-copters, where novices can easily design free-formed, even asymmetric bamboo-copters that successfully fly. The designed bamboo-copters can be fabricated using digital fabrication equipment, such as a laser cutter. Our system provides two useful functions for facilitating this design activity. First, it visualizes a simulated flight trajectory of the current bamboo-copter design, which is updated in real time during the user's editing. Second, it provides an optimization function that automatically tweaks the current bamboo-copter design such that the spin quality-how stably it spins-and the flight quality-how high and long it flies-are enhanced. To enable these functions, we present non-trivial extensions over existing techniques for designing free-formed model airplanes [UKSI14], including a wing discretization method tailored to free-formed bamboo-copters and an optimization scheme for achieving stable bamboo-copters considering both spin and flight qualities.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.6 [computer graphics]: Methodology and Techniques&mdash Interaction techniques I.3.8 [computer graphics]: applications&mdash I.3.5 [computer graphics]: Computational Geometry and Object Modeling&mdash Physically based modeling

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Sketching MLS Image Deformations On the GPU

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computer graphics FORUM 2008年第7期27卷 1789-1796页

作者： Weng, Yanlin Shi, Xiaohan Bao, Hujun Zhang, Jun Univ Wisconsin Milwaukee WI 53201 USA Zhejiang Univ State Key Lab CAD&CG Hangzhou Zhejiang Peoples R China

In this paper, we present an image editing tool that allows the user to deform images using a sketch-based interface. The user simply sketches a set of source curves in the input image, and also some target curves that the source curves should be deformed to. Then the moving least squares (MLS) deformation technique [SMW06] is adapted to produce realistic deformations while satisfying the curves' positional constraints. We also propose a scheme to reduce image fold-overs in MLS deformations. Our system has a very intuitive user interface, generates physically plausible deformations, and can be easily implemented on the GPU for real-time performance.

关键词： I.3.5 [computer graphics]: Computational Geometry and Object Modeling-Boundary representations

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Aesthetic Rating and Color Suggestion for Color Palettes

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computer graphics FORUM 2016年第7期35卷 127-136页

作者： Kita, N. Miyata, K. Japan Adv Inst Sci & Technol Nomi Ishikawa Japan

A model to rate color combinations that considers human aesthetic preferences is proposed. The proposed method does not assume that a color palette has a specific number of colors, i.e., input is not restricted to a two-, three-, or five-color palettes. We extract features from a color palette whose size does not depend on the number of colors in the palette. The proposed rating prediction model is trained using a human color preference dataset. The model allows a user to extend a color palette, e.g., from three colors to five or seven colors, while retaining color harmony. In addition, we present a color search scheme for a given palette and a customized version of the proposed model for a specific color tone. We demonstrate that the proposed model can also be applied to various palette-based applications.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.0 [computer graphics]: General&mdash

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Skeleton-driven Adaptive Hexahedral Meshing of Tubular Shapes

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computer graphics FORUM 2016年第7期35卷 237-246页

作者： Livesu, Marco Muntoni, Alessandro Puppo, Enrico Scateni, Riccardo CNR IMATI Genoa Italy Univ Cagliari I-09124 Cagliari Italy Univ Genoa Genoa Italy

We propose a novel method for the automatic generation of structured hexahedral meshes of articulated 3D shapes. We recast the complex problem of generating the connectivity of a hexahedral mesh of a general shape into the simpler problem of generating the connectivity of a tubular structure derived from its curve-skeleton. We also provide volumetric subdivision schemes to nicely adapt the topology of the mesh to the local thickness of tubes, while regularizing per-element size. Our method is fast, one-click, easy to reproduce, and it generates structured meshes that better align to the branching structure of the input shape if compared to previous methods for hexa mesh generation.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.5 [computer graphics]: Computational Geometry and Object Modeling&mdash Physically based modeling

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QAS: Real-time quadratic approximation of subdivision surfaces

QAS: Real-time quadratic approximation of subdivision surfac...

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15th pacific conference on computer graphics and applications (pacific graphics 2007)

作者： Boubekeur, Tamy Schlick, Christophe Univ Bordeaux INRIA LaBRI Bordeaux France

ISBN: (纸本)9780769530093

We introduce QAS, an efficient quadratic approximation of subdivision surfaces which offers a vend close appearance compared to the true subdivision surface but avoids recursion, providing at least one order of magnitude faster rendering. QAS uses enriched polygons, equipped with edge vertices, and replaces them on-the-fly with low degree polynomials for interpolating positions and normals. By systematically projecting the vertices of the input coarse mesh at their limit position on the subdivision surface, the visual quality of the approximation is good enough for imposing only a single subdivision step, followed by our patch fitting, which allows real-time performances for million polygons output. Additionally, the parametric nature of the approximation offers an efficient adaptive sampling for rendering and displacement mapping. Last, the hexagonal support associated to each coarse triangle is adapted to geometry processors.

关键词： Rendering (computer graphics)

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A Resolution Independent Approach for the Accurate Rendering of Grooved Surfaces

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computer graphics FORUM 2008年第7期27卷 1937-1944页

作者： Bosch, C. Pueyo, X. Merillou, S. Ghazanfarpour, D. Univ Girona Inst Informat & Aplicac Girona Spain Univ Limoges Inst Rech XLIM F-87065 Limoges France

This paper presents a method for the accurate rendering of path-based surface details such as grooves, scratches and similar features. The method is based on a continuous representation of the features in texture space, and the rendering is performed by means of two approaches: one for isolated or non-intersecting grooves and another for special situations like intersections or ends. The proposed solutions perform correct antialiasing and take into account visibility and inter-reflections with little computational effort and memory requirements. Compared to anisotropic BRDFs and scratch models, we have no limitations on the distribution of grooves over the surface or their geometry, thus allowing more general patterns. Compared to displacement mapping techniques, we can efficiently simulate features of all sizes without requiring additional geometry or multiple representations.

关键词： I.3.3 [computer graphics]: Picture/Image Generation I.3.7 [computer graphics]: Three-Dimensional graphics and Realism [color shading shadowing and texture]

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Interactive volume illustration and feature halos 11

Interactive volume illustration and feature halos

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11th pacific conference on computer graphics and applications

作者： Svakhine, NA Ebert, DS Purdue Univ Rending & Perceptualizat Lab W Lafayette IN 47907 USA

ISBN: (纸本)0769520286

Volume illustration is a developing trend in volume visualization, focused on conveying volume information effectively by enhancing interesting features of the volume and omitting insignificant data. However, the calculations involved have limited the illustration process to non-interactive rendering. We have developed a new interactive volume illustration system (IVIS) that harnesses the power of programmable graphics processors, and includes a novel approach for feature halo enhancement. This interactive illustration system is a powerful tool for exploration and analysis of volumetric datasets.

关键词： Acceleration Biomedical imaging computer graphics Data analysis Data visualization Hardware Isosurfaces Program processors Rendering (computer graphics) Shape

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Incremental Deformation Subspace Reconstruction

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computer graphics FORUM 2016年第7期35卷 169-178页

作者： Mukherjee, R. Wu, X. Wang, H. Ohio State Univ Columbus OH 43210 USA

Recalculating the subspace basis of a deformable body is a mandatory procedure for subspace simulation, after the body gets modified by interactive applications. However, using linear modal analysis to calculate the basis from scratch is known to be computationally expensive. In the paper, we show that the subspace of a modified body can be efficiently obtained from the subspace of its original version, if mesh changes are small. Our basic idea is to approximate the stiffness matrix by its low-frequency component, so we can calculate new linear deformation modes by solving an incremental eigenvalue decomposition problem. To further handle nonlinear deformations in the subspace, we present a hybrid approach to calculate modal derivatives from both new and original linear modes. Finally, we demonstrate that the cubature samples trained for the original mesh can be reused in fast reduced force and stiffness matrix evaluation, and we explore the use of our techniques in various simulation problems. Our experiment shows that the updated subspace basis still allows a simulator to generate visual plausible deformation effects. The whole system is efficient and it is compatible with other subspace construction approaches.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.7 [computer graphics]: Three-Dimensional graphics and Realism&mdash Animation

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Real-time Animation of Sand-Water Interaction

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computer graphics FORUM 2008年第7期27卷 1887-1893页

作者： Rungjiratananon, Witawat Szego, Zoltan Kanamori, Yoshihiro Nishita, Tomoyuki Univ Tokyo Tokyo 1138654 Japan

Recent advances in physically-based simulations have made it possible to generate realistic animations. However, in the case of solid-fluid coupling, wetting effects have rarely been noticed despite their visual importance especially in interactions between fluids and granular materials. This paper presents a simple particle-based method to model the physical mechanism of wetness propagating through granular materials;Fluid particles are absorbed in the spaces between the granular particles and these wetted granular particles then stick together due to liquid bridges that are caused by surface tension and which will subsequently disappear when over-wetting occurs. Our method can handle these phenomena by introducing a wetness value for each granular particle and by integrating those aspects of behavior that are dependent on wetness into the simulation framework. Using this method, a GPU-based simulator can achieve highly dynamic animations that include wetting effects in real time.

关键词： I.3.7 [computer graphics]: Three-Dimensional graphics and Realism

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