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pacific conference on computer graphics and applications

作者： Yizhou Yu Department of Computer Science University of Illinois Urbana-Champaign Champaign IL USA

ISBN: (纸本)0769512275

The author presents an effective method for modeling realistic curly hairstyles, taking into account both artificial hairstyling processes and natural curliness. The result is a detailed geometric model of hairs that can be rendered and animated via existing methods. Our technique exploits the analogy between hairs and a vector field; it interactively and efficiently models global and local hair flows by superimposing procedurally defined vector field primitives that have local influence. Usually only a very small number of vector field primitives are needed to model a complicated hairstyle. An initial model of hair strands is extracted from the superimposed vector fields by tracing their field lines. Random natural or artificial curliness can be added to the initial model through a parametric hair offset function with a randomized distribution of parameters over the scalp. Techniques for shearing and clustering are also designed to improve the overall appearance of the hair model. Our technique has been successfully applied to generate a variety of realistic hairstyles with different curliness and length distributions.

关键词： Hair Scalp Shape Animation Shearing Deformable models Humans computer graphics Gravity computer science

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Appearance Harmonization for Single Image Shadow Removal

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computer graphics FORUM 2016年第7期35卷 189-197页

作者： Ma, Li-Qian Wang, Jue Shechtman, Eli Sunkavalli, Kalyan Hu, Shi-Min Tsinghua Univ TNList Beijing Peoples R China Adobe Res New York NY USA

Shadow removal is a challenging problem and previous approaches often produce de-shadowed regions that are visually inconsistent with the rest of the image. We propose an automatic shadow region harmonization approach that makes the appearance of a de-shadowed region (produced using any previous technique) compatible with the rest of the image. We use a shadow-guided patch-based image synthesis approach that reconstructs the shadow region using patches sampled from non-shadowed regions. This result is then refined based on the reconstruction confidence to handle unique textures. Qualitative comparisons over a wide range of images, and a quantitative evaluation on a benchmark dataset show that our technique significantly improves upon the state-of-the-art.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [computer graphics]: Picture/Image Generation—

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Interactive mesh dragging with adaptive remeshing technique

Interactive mesh dragging with adaptive remeshing technique

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pacific conference on computer graphics and applications

作者： H. Suzuki Y. Sakurai T. Kanai F. Kimura Department of Precision Engineering University of Tokyo Bunkyo Tokyo Japan Information and Communication Systems Laboratory NTT Japan Materials Fabrication Laboratory RIKEN Department of Precision Engineering University of Tokyo Japan

We propose a 3D mesh dragging method useful for intuitive, efficient geometric modeling of free form polygonal models. With our method, the user can drag a part of a triangular mesh and change its position and orientation. This method is based on an adaptive remeshing procedure which evaluates the deformation of faces by dragging and properly modifies them by deleting or splitting with local topological operations. Therefore the mesh is automatically adjusted for dragging, and irregularity caused by dragging onto the mesh is no longer a concern. In addition, this method is local to the dragged portion, so its computation is efficient. We describe our adaptive remeshing method and demonstrate some dragging examples.

关键词： Solid modeling Precision engineering Fabrication Laboratories Design methodology Graphical user interfaces computer displays computer interfaces Rendering (computer graphics) Computational efficiency

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Using guides to explore multimedia databases

Using guides to explore multimedia databases

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Proceedings of the Twenty-Second Annual Hawaii International conference on System Sciences: Emerging Technologies and applications Track

作者： Salomon, Gitta Oren, Tim Kreitman, Kristee Apple Computer Inc Cupertino CA USA

ISBN: (纸本)0818619147

The design and implementation of a multimedia database is surveyed and an interface technique called guides is presented, which simplifies database access by alleviating the need to construct search queries. The user is given a selection of images of people who embody easily understood points of view. A user can choose a guide as a companion while browsing the database. At each database node the user is provided with the guide's next choice and thus can follow the interest path of a certain type of individual. The graphical tools and interface provided to the text, graphics and sound database are presented. The design and functionality of alphabetical and topical indexes, multimedia tours, timelines and animated maps are detailed. Future directions for development are indicated. The concept of guides can be easily generalized and applied to other databases.

关键词： Database systems

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Adaptive solid texturing for Web3D applications

Adaptive solid texturing for Web3D applications

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pacific conference on computer graphics and applications

作者： Bing-Yu Chen T. Nishita University of Tokyo Japan

ISBN: (纸本)0769517846

Solid texturing is a well-known computer graphics technology, which is problematic because it consumes too much time if every pixel is calculated on the fly or has a very high memory requirement if all of the pixels are stored at the beginning. Although some methods have been proposed, almost all of them need the support of specific hardware accelerators. Hence, these methods could not be applied to all kinds of machine, especially low-cost ones available over the Internet. Therefore, we present a new method for procedural solid texturing. Our approach could almost render an object with solid texturing in real-time using only a software solution. Furthermore, to demonstrate that our approach is widely applicable we choose pure Java for its implementation, since it does not receive any benefit from hardware and could be executed on the Internet directly.

关键词： Solids computer graphics Application software

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Fast and memory efficient view-dependent trimmed NURBS rendering

Fast and memory efficient view-dependent trimmed NURBS rende...

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pacific conference on computer graphics and applications

作者： M. Guthe J. Meseth R. Klein Institute of Computer Science II Computer Graphics University of Bonn Bonn Germany

The problem of rendering large trimmed NURBS models at interactive frame rates is of great interest for industry, since nearly all their models are designed on the basis of this surface type. Most existing approaches first transform the NURBS surfaces into polygonal representation and subsequently build static levels of detail upon them, as current graphics hardware is optimized for rendering triangles. lit this work, we present a method for memory efficient, view-dependent rendering of trimmed NURBS surfaces that yields high-quality results at interactive frame rates. In contrast to existing algorithms, our approach needs not store hierarchies of triangles, since utilizing our special multiresolution seam graph data structure, we are able to generate required triangulations on the fly.

关键词： Spline Surface topography Surface reconstruction Rendering (computer graphics) computer graphics Hardware Solid modeling computer industry Data structures Surface treatment

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Modeling of clouds from satellite images using metaballs

Modeling of clouds from satellite images using metaballs

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pacific conference on computer graphics and applications

作者： Y. Dobashi T. Nishita H. Yamashita T. Okita Hiroshima City University Hiroshima Japan Fukuyama University Fukuyama Japan Hiroshima University Higashihiroshima Japan

The paper proposes an image based modeling of clouds where realistic clouds are created from satellite images using metaballs. The intention of the paper is for applications to space flight simulators, the visualization of the weather information, and the simulation of surveys of the Earth. In the proposed method, the density distribution inside the clouds is defined by a set of metaballs. Parameters of metaballs, such as center positions, radii, and density values, are automatically determined so that a synthesized image of clouds modeled by using metaballs is similar to the original satellite image. We also propose an animation method for clouds generated by a sequence of satellite images taken at some interval. The usefulness of the proposed method is demonstrated by several examples of clouds generated from satellite images of typhoons passing through Japan.

关键词： Clouds Satellites Earth Computational modeling Typhoons Fractals computer graphics Image generation Large-scale systems Aerospace simulation

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INSPIRE: an interactive image assisted non-photorealistic rendering system

INSPIRE: an interactive image assisted non-photorealistic re...

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pacific conference on computer graphics and applications

作者： M.X. Nguyen Hui Xu Xiaoru Yuan Baoquan Chen Department of Computer Science and Engineering University of Minnesota Twin-Cities Minneapolis MN USA

We present a GPU supported interactive non-photorealistic rendering system, INSPIRE, which performs feature extraction in both image space, on intermediately rendered images, and object space, on models of various representations, e.g., point, polygon, or hybrid models, without needing connectivity information. INSPIRE obtains interactive NPR rendering with most styles of existing NPR systems, but offers more flexibility on model representations and compromises little on rendering speed.

关键词： Rendering (computer graphics) Feature extraction Hardware computer graphics Coherence computer vision Image edge detection computer science Cities and towns Ink

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Modeling the structure of the sea anemone and the sea star using hierarchical implicit surfaces

Modeling the structure of the sea anemone and the sea star u...

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pacific conference on computer graphics and applications

作者： Xikun Liang M.A. Nur B. Wyvill Department of Computer Science University of Calgary Calgary Canada

ISBN: (纸本)0769512275

The paper presents a new method for modeling the structure of sea anemones and sea stars. Two specific invertebrates, the sea anemone, Stomphia coccinea and the sea star, Dermasterias imbricata were modeled using hierarchical implicit surfaces based on the BlobTree. The hierarchy provides both local refinement and global deformation. Local refinement allows the introduction of details on the base surface and global deformations change the overall shape of the model while maintaining the integrity of the surface details. Using a new implicit surface phyllotactic method, we obtain a visually pleasing arrangement of the sea anemone's tentacles. The hierarchical representation of the model provides an easy and efficient way for modeling the many different shape changes of sea anemones.

关键词： Sea surface Shape Deformable models Spline Animal structures Mouth Surface waves computer science Spirals Spine

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Adaptive progressive vertex tracing in distributed environments

Adaptive progressive vertex tracing in distributed environme...

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pacific conference on computer graphics and applications

作者： T. Ullmann B. Bruderlin D. Beier A. Schmidt Commercial Vehicle Development DaimlerChrysler AG Research and Technology Sindelfingen Germany Department of Computer Science and Automation Technical University Ilmenau Germany Development Mercedes-Benz Passenger Cars DaimlerChrysler AG

The paper presents "vertex tracing", a new approach to adaptive progressive ray tracing. The software achieves real-time rendering performance of physically accurate reflection effects on specified scene objects, even with complex scenes in virtual reality applications. The approach is based on hybrid rendering, combining an OpenGL-generated scene with correct reflection characteristics of selected scene objects. The real-time performance of the vertex tracer is achieved with progressive adaptive refinement of the geometry in object space, and with parallelization of the algorithm. Both shared memory and distributed memory architectures have been investigated. Mesh-based load balancing yields a uniform distribution of the computing load, also in a heterogeneous network with resources of widely varying performance. The performance of the overall system is demonstrated with a truck interior in a virtual reality simulator.

关键词： Layout Reflection Virtual reality Ray tracing Software performance Application software Geometry Memory architecture Load management computer networks

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