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Transplanting and Editing Animations on Skinned Meshes

Transplanting and Editing Animations on Skinned Meshes

引用

pacific conference on computer graphics and applications

作者： Yuntao Jia Wei-wen Feng Yizhou Yu Department of Computer Science University of Illinois at Urbana-Champaign USA Department of Computer Science University of Illinois at Urbana-Champaign

Skinned Mesh Animation (SMA) well approximates a mesh animation with extracted bones and their transformations. However, unlike skeleton, bones in SMA are not organized in hierarchies, thus they need mesh dependent translation vectors which prevent other sources of motion (i.e. skeletal animations, MoCAP, SMAs etc) from being applied to the skinned mesh. In this paper, we propose a new and fast method to transplant motion to skinned meshes. By efficiently solving a linear least-squares system, we can compute new translation vectors which enable the motion to work on the skinned mesh. Based on the same idea, we have also devised a SMA editing tool which allows users to edit frames of the SMA interactively. Furthermore, the editing can be propagated to all subsequent frames.

关键词： Animation Bones Vectors computer graphics Skeleton Application software computer science Large-scale systems Motion pictures computer industry

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Freeform Image

Freeform Image

引用

pacific conference on computer graphics and applications

作者： Thomas Schiwietz Joachim Georgii Rudiger Westermann Siemens Corporate Research Imaging & Visualization Princeton USA Computer Graphics & Visualization Technische Universität München Munich Germany

ISBN: (纸本)9780769530093;0769530095

In this paper we present a technique for image deformation in which the user is given flexible control over what kind of deformation to perform. Freeform image extends available image deformation techniques in that it provides a palette of intuitive tools including interactive object segmentation, stiffness editing and force-based controls to achieve both a natural look and realistic animations of deforming parts. The model underlying our approach is physics-based and it is amenable to a variety of different kinds of image manipulations ranging from as-rigid- as-possible to fully elastic deformations. We have developed a multigrid solver for quadrangular finite elements, which achieves real-time performance for high resolution pixel grids. On recent CPUs this solver can handle about 16K co-rotated finite elements at roughly 60 ms.

关键词： computer graphics Visualization Force control Finite element methods Shape control Interpolation Application software Object segmentation Animation Deformable models

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Interactive Global Illumination Using Implicit Visibility

Interactive Global Illumination Using Implicit Visibility

引用

pacific conference on computer graphics and applications

作者： Zhao Dong Jan Kautz Christian Theobalt Hans-Peter Seidel MPI Informatik Germany University College London UK University of Stanford USA

ISBN: (纸本)9780769530093

Rendering global illumination effects for dynamic scenes at interactive frame rates is a computationally challenging task. Much of the computation time needed is spent during visibility queries between individual scene elements, and it is almost illusive to update this information at realtime even for moderately complex scenes. In this paper, we propose a global illumination approach for dynamic scenes that runs at near-real-time frame rates on a single PC. Our method is inspired by the principles of hierarchical radiosity and tackles the visibility problem by implicitly evaluating mutual visibility while constructing a hierarchical link structure between scene elements. By means of the same efficient and easy-to-implement framework, we are able to reproduce a large variety of complex lighting effects for moderately sized scenes, such as interreflections, environment map lighting as well as area light sources.

关键词： Lighting Layout Ray tracing Light sources Finite element methods Geometry computer graphics Application software Educational institutions Rendering (computer graphics)

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QAS: Real-Time Quadratic Approximation of Subdivision Surfaces

QAS: Real-Time Quadratic Approximation of Subdivision Surfac...

引用

pacific conference on computer graphics and applications

作者： Tamy Boubekeur Christophe Schlick LaBRI-INRIA University of Bordeaux 1 France

ISBN: (纸本)9780769530093;0769530095

We introduce QAS, an efficient quadratic approximation of subdivision surfaces which offers a very 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： Geometry Polynomials Surface fitting Mesh generation Rendering (computer graphics) computer graphics Application software Real time systems Sampling methods Hardware

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Brightness Adjustment for HDR and Tone Mapped Images

Brightness Adjustment for HDR and Tone Mapped Images

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pacific conference on computer graphics and applications

作者： Grzegorz Krawczyk Rafal Mantiuk Dorota Zdrojewska Hans-Peter Seidel MPI Informatik Saarbrucken Germany Szczecin University of Technology Szczecin Poland

ISBN: (纸本)9780769530093;0769530095

Both high dynamic range images and their tone mapped correspondents contain relative luminance values which have to be mapped on a scale of available gray levels of a display. Such mapping includes brightness adjustment, which has a direct impact on the final image appearance and the observers' assessment of image quality. We conduct a psychophysical experiment in which subjects adjust image brightness to match their preference. We observe that the brightness choice is consistent across subjects and is primarily affected by image content. We investigate popular methods for automatic brightness adjustment and show a significant inaccuracy for a group of images. The incorrect brightness adjustment degrades in these cases perceived image quality. We identify characteristics of images that are highly correlated with the subjects' choice of brightness and develop an improved model for the brightness adjustment.

关键词： Brightness Layout Displays TV Dynamic range Photography Image quality computer graphics Visualization Printing

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The Mental Canvas: A Tool for Conceptual Architectural Design and Analysis

The Mental Canvas: A Tool for Conceptual Architectural Desig...

引用

pacific conference on computer graphics and applications

作者： Julie Dorsey Songhua Xu Gabe Smedresman Holly Rushmeier Leonard McMillan Department of Computer Science Yale University USA Department of Computer Science University of North Carolina Chapel Hill USA

We describe a computer graphics system that supports conceptual architectural design and analysis. We use as a starting point the traditional sketchbook drawings that architects use to experiment with various views, sections, and details. Rather than interpret or infer 3D structure from drawings, our system is designed to allow the designer to organize concept drawings in 3D, and gradually fuse a series of possibly geometrically-inconsistent sketches into a set of 3D strokes. Our system uses strokes and planar "canvases" as basic primitives; the basic mode of input is traditional 2D drawing. We introduce methods for the user to control stroke visibility and transfer strokes between canvases. We also introduce methods for the user to position and orient the canvases that have infinite extent. We demonstrate the use of the system to analyze existing structures and conceive new designs.

关键词： Buildings Shape computer graphics computer science Fuses Process design Application software Design automation Geometry Image analysis

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Towards Digital Refocusing from a Single Photograph

Towards Digital Refocusing from a Single Photograph

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pacific conference on computer graphics and applications

作者： Yosuke Bando Tomoyuki Nishita TOSHIBA Corporation

This paper explores an image processing method for synthesizing refocused images from a single input photograph containing some defocus blur. First, we restore a sharp image by estimating and removing spatially-variant defocus blur in an input photograph. To do this, we propose a local blur estimation method able to handle abrupt blur changes at depth discontinuities in a scene, and we also present an efficient blur removal method that significantly speeds up the existing deconvolution algorithm. Once a sharp image is restored, refocused images can be interactively created by adding different defocus blur to it based on the estimated blur, so that users can intuitively change focus and depth-of-field of the input photograph. Although information available from a single photograph is highly insufficient for fully correct refocusing, the results show that visually plausible refocused images can be obtained.

关键词： Image restoration Focusing Digital cameras computer graphics Image processing Layout Deconvolution Lenses Application software Optical arrays

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Efficient Spherical Harmonics Representation of 3D Objects

Efficient Spherical Harmonics Representation of 3D Objects

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pacific conference on computer graphics and applications

作者： Mohamed-Hamed Mousa Raphaelle Chaine Samir Akkouche Eric Galin Bernard University Lyon France

In this paper, we present a new and efficient spherical harmonics decomposition for spherical functions defining 3D triangulated objects. Such spherical functions are intrinsically associated to star-shaped objects. However, our results can be extended to any triangular object after segmentation into star-shaped surface patches and recomposition of the results in the implicit framework. There is thus no restriction about the genus number of the object. We demonstrate that the evaluation of the spherical harmonics coefficients can be performed by a Monte Carlo integration over the edges, which makes the computation more accurate and faster than previous techniques, and provides a better control over the precision error in contrast to the voxel-based methods. We present several applications of our research, including fast spectral surface reconstruction from point clouds, local surface smoothing and interactive geometric texture transfer.

关键词： Power harmonic filters Clouds Surface reconstruction computer graphics Application software Error correction Shape Filtering Grid computing Discrete transforms

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Image-Space Caustics and Curvatures

Image-Space Caustics and Curvatures

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pacific conference on computer graphics and applications

作者： Xuan Yu Feng Li Jingyi Yu Department of Computer and Information Sciences University of Delaware Newark DE USA

ISBN: (纸本)9780769530093;0769530095

Caustics are important visual phenomena, as well as challenging global illumination effects in computer graphics. Physically caustics can be interpreted from one of two perspectives: in terms of photons gathered on scene geometry, or in terms of a pair of caustic surfaces. These caustic surfaces are swept by the foci of light rays. In this paper, we develop a novel algorithm to approximate caustic surfaces of sampled rays. Our approach locally parameterizes rays by their intersections with a pair of parallel planes. We show neighboring ray triplets are constrained to pass simultaneously through two slits, which rule the caustic surfaces. We derive a ray characteristic equation to compute the two slits, and hence, the caustic surfaces. Using the characteristic equation, we develop a GPU-based algorithm to render the caustics. Our approach produces sharp and clear caustics using much fewer ray samples than the photon mapping method and it also maintains high spatial and temporal coherency. Finally, we present a normal-ray surface representation that locally parameterizes the normals about a surface point as rays. Computing the normal ray caustic surfaces leads to a novel real-time discrete shape operator.

关键词： Surface fitting Equations Rendering (computer graphics) computer graphics Optical reflection Lighting Layout Geometry Shape Mirrors

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Integrative Information Visualization of Multimodality Neuroimaging Data

Integrative Information Visualization of Multimodality Neuro...

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pacific conference on computer graphics and applications

作者： Guangyu Zou Jing Hua Ming Dong Department of Computer Science Wayne State University Detroit MI USA

ISBN: (纸本)9780769530093;0769530095

This paper presents a novel integrative information visualization framework for cross-subject neuroimaging data analysis. The framework can integrate multimodal information captured by different imaging modalities and population-based statistical information presented by different subjects. In this framework, accurate registration of cortical structures is the foundation for the information integration across population. We present a non-rigid intersubject brain surface registration method using conformal structure and spherical thin-plate splines. Spherical thin-plate splines are designed to explicitly match prominent homologous landmarks, and meanwhile, interpolate a global deformation field on the spherical domain, registering brain surfaces in a transformed space. Subsequently, an approach for the integrative information fusion and visualization is presented to handle multimodality neuroimaging data. The entire framework demonstrates its usefulness in multimodality neuroimaging data analysis across subjects.

关键词： Data visualization Neuroimaging Shape Data analysis Geometry Brain modeling Positron emission tomography Deformable models computer graphics Application software

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