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Single-image reflectance estimation for relighting by iterative soft grouping

Single-image reflectance estimation for relighting by iterat...

引用

pacific conference on computer graphics and applications

作者： Yuanzhen Li S. Lin Sing Bing Kang Hanqing Lu Heung-Yeung Shum Microsoft Research Limited Chinese Academy and Sciences China Microsoft Research Limited UK

ISBN: (纸本)0769517846

Reflectance values for image-based relighting are often estimated from grouped pixels with similar reflectance, but such groupings are difficult to compute with certainty for sparse image data. To address this problem, we propose an iterative method that aggregates BRDF data in a single image with known geometry and lighting by soft grouping, where pixels contribute to one another's estimate according to their degree of reflectance similarity. Estimation of specular reflectance is further improved by albedo-independent soft grouping of pixels based on shape continuity. With recovered reflectances, we demonstrate realistic relighting for synthetic and real scenes, including surfaces with spatially-varying reflectance.

关键词： Reflectivity Pixel Layout Lighting Brain modeling Iterative methods Aggregates Geometry computer graphics Rendering (computer graphics)

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Freeform Image

Freeform Image

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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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Transplanting and Editing Animations on Skinned Meshes

Transplanting and Editing Animations on Skinned Meshes

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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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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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Real-time voxelization for complex polygonal models

Real-time voxelization for complex polygonal models

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pacific conference on computer graphics and applications

作者： Zhao Dong Wei Chen Hujun Bao Hongxin Zhang Qunsheng Peng State Key Laboratory of CAD&CG University of Zhejiang Hangzhou China

ISBN: (纸本)0769522483

In this paper, we present an efficient voxelization algorithm for complex polygonal models by exploiting newest programmable graphics hardware. We first convert the model into three discrete voxel spaces according to its surface orientation. The resultant voxels are encoded as 2D textures and stored in three intermediate sheet buffers called directional sheet buffers. These buffers are finally synthesized into one worksheet, which records the volumetric representation of the target. The whole algorithm traverses the geometric model only once and is accomplished entirely in GPU (graphics processing unit), achieving real-time frame rate for models with up to 2 million triangles.

关键词： Solid modeling computer graphics Buffer storage Hardware Robustness Haptic interfaces Filters Volume measurement Shape Visualization

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Design and implementation of the Maya Renderer

Design and implementation of the Maya Renderer

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pacific conference on computer graphics and applications

作者： K. Sung J. Craighead Changyaw Wang S. Bakshi A. Pearce A. Woo AliasWavefront Toronto ONT Canada

Maya is the new 3D software package recently released by Alias I Wavefront for creating state of the art character animation and visual effects. Built on a next generation advanced architecture, Maya delivers high speed interaction and high productivity for its users. In the Fall of 1995, the Rendering Team at Alias/Wavefront started from scratch to design and implement a renderer for the Maya project. This was a very challenging task, requiring the efficient generation of high quality images for a next generation 3D application that was still under development. In addition, we were expected to match or exceed the capabilities of our existing popular rendering products (as well as those from our competitors). In January of 1998, the all new renderer was delivered with Maya 1.0. It includes a comprehensive user interface that is well integrated with the rest of the system, and a batch renderer that is capable of efficiently generating a full spectrum of high quality visual effects. Currently, there are high end computer graphics (CG) productions in progress that are using the Maya Renderer. We concentrate on our batch renderer implementation effort. We describe the philosophy, design decisions, and the tasks we set out to achieve in 1995. We then evaluate the delivered system based on images generated with the renderer.

关键词： Rendering (computer graphics) Visual effects Software packages Animation computer architecture Productivity User interfaces computer graphics Character generation Production

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Stream bubbles for steady flow visualization

Stream bubbles for steady flow visualization

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pacific conference on computer graphics and applications

作者： Bing Zhang A. Pang Computer Science Department University of California Santa Cruz CA USA

ISBN: (纸本)0769512275

This paper introduces a new relatively inexpensive technique - stream bubbles for 3D flow visualization. The physical analogy to this technique are bubbles that can be observed in nature with different shapes and varying speeds. A stream bubble is a surface, defined by a small set of vertices, advected through a flow field. It can easily manifest flow features like twist, stretch, expansion and rotation. Upon encountering an obstacle, stream bubbles will automatically erode and/or split in an intuitively geometric way. For highly divergent and vortical fields, it can also break apart based on the aspect ratio of the bounding volume. When two or more stream bubbles meet, no explicit merge operation is needed since the surfaces will simply intersect each other to form a composite surface. No effort is made to make the intersection smooth. Stream bubbles may be of different sizes. Larger bubbles give a coarse global view of the flow structure, while smaller ones give a more accurate depiction. In addition, our interface provides an interactive, multi-resolution visualization environment facilitated with an animated or step-by-step playback function.

关键词： Visualization Computational fluid dynamics Filling Sampling methods computer science HTML Shape Animation Spline Surface topography

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Volumetric modeling of colored pencil drawing

Volumetric modeling of colored pencil drawing

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pacific conference on computer graphics and applications

作者： S. Takgi I. Fujishiro M. Nakajima Dept. of Comput. Sci. Tokyo Inst. of Technol. Japan Department of Information Sciences Ochanomizu University Bunkyo Tokyo Japan Department of Computer Science Tokyo Institute of Technology Meguro Tokyo Japan

Not only photorealistic rendering but non-photorealistic rendering is considered an important research topic in artistic image synthesis. However, little attention has been given to colored pencil drawing. This paper proposes a volume graphics model for colored pencil drawing. The model consists of three sub-models, which describe in a volumetric fashion, the microstructure of paper, pigment distribution on paper, and pigment redistribution, respectively. The model takes advantage of volumetric offset distance accessibility and line integral convolution, and thus is highly controllable with a small number of parameters. A couple of synthesized color pencil drawing data sets are rendered using an existing volume visualizer to empirically prove that the model is descriptive enough to produce realistic images of colored pencil drawing.

关键词： Pigmentation Painting Rendering (computer graphics) Eyes computer science Image generation graphics Microstructure Data visualization Petroleum

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Virtual Stage: a scenario-based karaoke system in a virtual environment

Virtual Stage: a scenario-based karaoke system in a virtual ...

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pacific conference on computer graphics and applications

作者： Kee Chang Lee Chang Whan Sul Kwang Yun Wohn Department of Computer Science Korea Advanced Institute of Science and Technology Taejon South Korea

ISBN: (纸本)0818680288

We describe our on-going work on Virtual Stage, a karaoke system which incorporates virtual reality technology. A runtime environment and authoring tools for interactive scenarios have been designed and implemented. We adopt a scenario-based representation to unfold a story in the virtual environment. A producer can make Virtual Stage applications which reflect his/her own scenario. While singing-along to the song played by Virtual Stage, the participants use their body to interact with virtual characters which behave intelligently in the virtual environment. The scenario written via authoring tools describes the interaction between the participant and virtual characters. The system analyzes video images of the participant to extract participant-related data, then the video image is composed into the rendered scene of a virtual environment.

关键词： Virtual environment Virtual reality Rendering (computer graphics) Layout Multimedia systems Artificial intelligence TV Games Intelligent agent Intelligent networks

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A visualization environment for electron microscopy

A visualization environment for electron microscopy

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pacific conference on computer graphics and applications

作者： I.M.B. Martin D.C. Marinescu Department of Computer Science Indiana University South Bend IN USA Department of Computer Science Purdue University West Lafayette IN USA

Describes an environment for visualization and processing of low-dose, low-contrast electron micrographs of biological specimens. We focus on image selection, the first step in the process of reconstruction of the 3D structure of a specimen from its projections. Noise from a variety of sources makes automatic detection of particle positions a difficult task. New image acquisition devices and modern electron microscopy methods require the processing and rendering of very large images (50-100 million pixels). We describe techniques for processing large images, algorithms for detecting particle positions on compressed images using the crosspoint method, and methods for position refinement. EMMA, an interactive visualization environment for experimenting with particle identification methods is presented.

关键词： Visualization Electron microscopy Fourier transforms Image reconstruction computer science Density functional theory Biology Working environment noise Rendering (computer graphics) Pixel

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