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

作者： Tong, Wai-Shun Tang, Chi-Keung Brown, Michael S. Xu, Ying-Qing Hong Kong Univ Sci & Technol Kowloon Hong Kong Peoples R China Nanyang Technol Univ Singapore 639798 Singapore Microsoft Res Asia Beijing Peoples R China

ISBN: (纸本)9780769530093

Cosmetic makeup is used worldwide as a means to enhance beauty and express moods. An art form in its own right, cosmetic styles continuously change and evolve to reflect cultural and societal trends. While countless magazines and books are dedicated to demonstrating cosmetic art, the actual application of makeup stilt remains a physical endeavor. In this paper, we describe a procedure to apply cosmetic makeup to the image of a person's face with the click of a mouse. Our approach works from before-and-after example images created by professional makeup artists. Using our "cosmetic-transfer" procedure, we can realistically transfer the cosmetic style captured in the example-pair to another person's face. This greatly reduces the time and effort needed to demonstrate a cosmetic style on a new person's face. In addition, our approach can be used to mix-and-match, and even fine-tune, example styles, all virtually, without the need for any physical makeup.

关键词： image-based rendering cosmetic-art applications

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Science of computer graphics 7

Science of computer graphics

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7th pacific conference on computer graphics and applications, pacific graphics 1999

作者： Kunii, Tosiyasu L. Hosei University 3-7-2 Kajino-cho Koganei City Tokyo184-8584 Japan 1-25-21-602 Hongo Bunkyo-ku Tokyo113-0033 Japan

ISBN: (纸本)0769502938

computer graphics lacks scientific foundation to make it an academic discipline. Science has been in search of invariants through various changes to identify the scientific truth to build theories on the invariants. A hierarchy of invariants is presented for computer graphics having cellular spatial structures as the core. Same application examples are shown for illustrative purposes. © 1999 IEEE.

关键词： A hierarchy of invariants Cellular spatial structures

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Optimizing network 3D data transmissions for interactive applications 8

Optimizing network 3D data transmissions for interactive app...

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8th pacific conference on computer graphics and applications

作者： Harada, I Sato, H Kitazawa, H NTT Lifestyle and Environmental Technology Laboratories Japan ATR Media Integration and Communications Research Laboratories Japan

ISBN: (纸本)0769508685

3D-object data transfer was optimized to accelerate interactive SD-scene design and virtual-space layout applications. In these applications, downloading many 3D objects reduces the interactivity of the clients. We used level of details based loading sequences and timing control methods to interleave data downloading and interactions. Experiments showed the maximum intervals between interactions were up to 6.42 times shorter.

关键词： Application software Data visualization Design optimization Layout Local area networks Poles and towers Research and development Timing Wide area networks

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An efficient brush model for physically-based 3D painting 10

An efficient brush model for physically-based 3D painting

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10th pacific conference on computer graphics and applications

作者： Chu, NSH Tai, CL Hong Kong Univ Sci & Technol Dept Comp Sci Kowloon Hong Kong Peoples R China

ISBN: (纸本)0769517846;0769517854

This paper presents a novel 3D brush model consisting of a skeleton and a surface, which is deformed through constrained energy minimization. The main advantage of our model over existing ones is in its ability to mimic brush flattening and bristle spreading due to brush bending and lateral friction exerted by the paper surface during the painting process. The ability to recreate such deformations is essential to realistic 3D digital painting simulations, especially in the case of Chinese brush painting and calligraphy. To further increase realism, we also model the plasticity of wetted brushes and the resistance exerted by pores on the paper surface onto the brush tip. Our implementation runs on a consumer-level PC in real-time and produces very realistic results.

关键词： Art Brushes computer science Deformable models Friction Painting Rendering (computer graphics) Skeleton Spline Surface resistance

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Snaking across 3D meshes

Snaking across 3D meshes

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12th pacific conference on computer graphics and applications (PG 2004)

作者： Jung, M Kim, H Sogang Univ Grad Sch Media Commun Dept Media Technol Sogang South Korea

ISBN: (纸本)0769522343

We present a novel method of moving snake curves over 3D meshes. Our snake is made from the vertices of a triangular mesh, so it never leaves the 3D surface, eliminating any need for mapping on to 2D and subsequent remapping on to the 3D mesh. Our snake will find features related to Gaussian curvature, or ridges and valleys. We move each vertex of the snake to one of its neighbor vertices on the mesh, while reducing the energy of the snake, which expresses distance from a feature, by means of a greedy optimization. This is fast enough to support real-time interaction. We handle changes of snake topology using 3D versions of methods originally developed for images. These can handle collisions within the snake, and hence split the snake and find multiple features. We demonstrate the performance of our algorithm on several example meshes, including human faces.

关键词： computer graphics

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Rendering natural waters 8

Rendering natural waters

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8th pacific conference on computer graphics and applications

作者： Premoze, S Ashikhmin, M Univ Utah Dept Comp Sci Salt Lake City UT 84112 USA

ISBN: (纸本)0769508685

Creating and rendering realistic water is one of the most daunting tasks in computer graphics. Realistic rendering of water requires that the sunlight and skylight illumination are correct, the water surface is modeled accurately and that the light transport within water body is properly handled. This paper describes a method for wave generation on a water surface using a physically-based approach. The wave generation uses data from the oceanographical observations and it is controlled by intuitive parameters such as wind speed and wind direction. The optical behavior of the water surfaces is complex but is well-described in the ocean science literature. We present a simple and intuitive light transport approach that is easy to use for many different water types such as deep ocean water muddy coastal water, and fresh water bodies. We demonstrate our model for a number of water and atmospheric conditions.

关键词： Atmospheric modeling computer graphics Lighting Oceans Optical surface waves Rendering (computer graphics) Sea measurements Sea surface Surface waves Wind speed

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Line-art rendering of 3D-models 8

Line-art rendering of 3D-models

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8th pacific conference on computer graphics and applications

作者： Rössl, C Kobbelt, L Max Planck Inst Comp Sci D-66133 Saarbrucken Germany

ISBN: (纸本)0769508685

We present an interactive system for computer aided generation of line art drawings to illustrate 3D models that are given as triangulated surfaces. In a preprocessing step an enhanced 2D view of the scene is computed by sampling for every pixel the shading, the normal vectors and the principal directions obtained from discrete curvature analysis. Then streamlines are traced in the 2D direction fields and are used to define: line strokes. In order to reduce noise artifacts the user may interactively select sparse reference lines and the system will automatically fill in additional strokes. By exploiting the special structure of the streamlines an intuitive and simple tone mapping algorithm can be derived to generate the final rendering.

关键词： Art Focusing Interactive systems Layout Noise reduction Rendering (computer graphics) Sampling methods Streaming media Stress Tail

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Fast soft shadow visualization for deformable moving light sources using adaptively sampled light field shadow maps 10

Fast soft shadow visualization for deformable moving light s...

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10th pacific conference on computer graphics and applications

作者： Jeng, EKY Xiang, ZG CUNY Grad Ctr Dept Comp Sci New York NY USA

ISBN: (纸本)0769517854

This is a two-stage soft shadow visualization technique for deformable moving area light sources using adaptively sampled light field shadow maps. In the pre-processing stage, we create a slab of shadow maps for the sample points in a light template. To reduce storage cost, our adaptive sampling method stores each map in a quadtree and only stores fine details from those areas that need them. In the dynamic visualization stage, we make use of the shadow maps to efficiently construct/update the shadowed image. Once the scene is processed for the initial lighting setup, a new lighting setup can be computed even more rapidly if most of the light points do not change.

关键词： computer science Educational institutions Layout Light sources Optical arrays Optical attenuators Rendering (computer graphics) Sampling methods Slabs Visualization

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Foveated Real-Time Ray Tracing for Head-Mounted Displays

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computer graphics FORUM 2016年第7期35卷 289-298页

作者： Weier, Martin Roth, Thorsten Kruijff, Ernst Hinkenjann, Andre Perard-Gayot, Arsene Slusallek, Philipp Li, Yongmin Bonn Rhein Sieg Univ Appl Sci Bonn Germany Univ Saarland D-66123 Saarbrucken Germany Intel Visual Comp Inst Saarland Germany German Res Ctr Artificial Intelligence DFKI Kaiserslautern Germany Brunel Univ London Uxbridge Middx England

Head-mounted displays with dense pixel arrays used for virtual reality applications require high frame rates and low latency rendering. This forms a challenging use case for any rendering approach. In addition to its ability of generating realistic images, ray tracing offers a number of distinct advantages, but has been held back mainly by its performance. In this paper, we present an approach that significantly improves image generation performance of ray tracing. This is done by combining foveated rendering based on eye tracking with reprojection rendering using previous frames in order to drastically reduce the number of new image samples per frame. To reproject samples a coarse geometry is reconstructed from a G-Buffer. Possible errors introduced by this reprojection as well as parts that are critical to the perception are scheduled for resampling. Additionally, a coarse color buffer is used to provide an initial image, refined smoothly by more samples were needed. Evaluations and user tests show that our method achieves real-time frame rates, while visual differences compared to fully rendered images are hardly perceivable. As a result, we can ray trace non-trivial static scenes for the Oculus DK2 HMD at 1182 x 1464 per eye within the the VSync limits without perceived visual differences.

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

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Combining 2D feature tracking and volume reconstruction for Online video-based human motion capture 10

Combining 2D feature tracking and volume reconstruction for ...

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10th pacific conference on computer graphics and applications

作者： Theobalt, C Magnor, M Schüler, P Seidel, HP Max Planck Inst Informat Saarbrucken Germany

ISBN: (纸本)0769517846;0769517854

The acquisition of human motion data is of major importance for creating interactive virtual environments, intelligent user interfaces, and realistic computer animations. Today's performance of off-the-shelf computer hardware enables marker-free non-intrusive optical tracking of the human body. In addition, recent research shows that it is possible to efficiently acquire and render volumetric scene representations in real-time. This paper describes a system to capture human motion at interactive frame rates without the use of markers or scene-intruding devices. Instead, 2D computer vision and 3D volumetric scene reconstruction algorithms are applied directly to the image data. A person is recorded by multiple synchronized cameras, and a multilayer hierarchical kinematic skeleton is fitted to each frame in a two-stage process. We present results with a prototype system running on two PCs.

关键词： Animation Hardware Humans Image reconstruction Layout Optical computing Rendering (computer graphics) Tracking User interfaces Virtual environment

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