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A 3D Voronoi-based skeleton and associated surface features

A 3D Voronoi-based skeleton and associated surface features

引用

pacific conference on computer graphics and applications

作者： M. Hisada A.G. Belyaev T.L. Kunii University of Aizu Aizu-Wakamatsu City Japan Hosei University Tokyo Japan IT Institute Kanazawa Institute of Technology Tokyo Japan

The paper proposes an approach for stable extraction of the skeleton of a polygonal surface and detection of surface features, ridges and ravines, corresponding to skeletal edges. The approach adapts the three-dimensional Voronoi diagram technique for skeleton extraction, explores the singularity theory for ridge and ravine detection, and combines several filtering methods for skeleton denoising and for selecting perceptually salient ridges and ravines. Rather than extract the skeleton as a CW-complex, we approximate it with a two-sided surface. It allows us to use standard mesh editing tools for skeleton denoising and achieve stable extraction of the ridges and ravines.

关键词： Skeleton Shape Noise reduction Cities and towns Face detection Filtering theory Paper technology Image edge detection computer vision Head

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Parallel and Distributed Computing: applications and Technologies 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Kim-Meow Liew Hong Shen Simon See Wentong Cai Pingzhi Fan Susumu Horiguchi

ISBN: (数字)9783540305019

ISBN: (纸本)9783540240136

The 2004 International conference on Parallel and Distributed Computing, - plications and Technologies (PDCAT 2004) was the ?fth annual conference, and was held at the Marina Mandarin Hotel, Singapore on December 8–10, 2004. Since the inaugural PDCAT held in Hong Kong in 2000, the conference has - come a major forum for scientists, engineers, and practitioners throughout the world to present the latest research, results, ideas, developments, techniques, and applications in all areas of parallel and distributed computing. The technical program was comprehensive and featured keynote speeches, te- nical paper presentations, and exhibitions showcased by industry vendors. The technical program committee was overwhelmed with submissions of papers for presentation, from countries worldwide. We received 242 papers and after - viewing them, based on stringent selection criteria, we accepted 173 papers. The papers in the proceedings focus on parallel and distributed computing viewed from the three perspectives of networking and architectures, software systems and technologies, and algorithms and applications. We acknowledge the great contribution from all of our local and international committee members and - perreviewerswhodevotedtheirtimeinthereviewprocessandprovidedvaluable feedback for the authors. PDCAT 2004 could never have been successful without the support and ass- tance of several institutions and many people. We sincerely appreciate the s- port from the National Grid O?ce and IEEE, Singapore for technical ***?nancialsponsorshipsfromtheindustrialsponsors,Hewlett- Packard Singapore; IBM Singapore; Sun Microsystems; SANDZ Solutions; S- icon graphics, and Advanced Digital Information Corporation, are gratefully acknowledged.

关键词： computer Communication Networks Theory of Computation Software Engineering/Programming and Operating Systems computer Systems Organization and Communication Networks Information Systems and Communication Service computer Imaging, Vision, Pattern Recognition and graphics

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Haptic sculpting of volumetric implicit functions

Haptic sculpting of volumetric implicit functions

引用

pacific conference on computer graphics and applications

作者： Jing Hua Hong Qin Department of Computer Science State University of New York Stony Brook Stony Brook NY USA

ISBN: (纸本)0769512275

Implicit functions characterized by the zero-set of polynomial-based algebraic equations and other commonly-used analytic equations are extremely powerful in graphics, geometric design, and visualization. But the potential of implicit functions is yet to be fully realized due to the lack of flexible and interactive design techniques. The paper presents a haptic sculpting system founded upon scalar trivariate B-spline functions. All the solids sculpted in our environment are semi-algebraic sets of volumetric implicit functions. We develop a large variety of sculpting toolkits equipped with an intuitive haptic interface to facilitate the direct manipulation of implicit functions in real-time. To facilitate multiresolution editing and different levels of details, we employ three techniques: hierarchical B-splines, CSG-based functional composition, and knot insertion. Our experiments demonstrate that our algorithms and haptics-based techniques can greatly overcome the modeling difficulties associated with implicit functions. The novel modeling techniques and their haptics-based design principle are extensible to the design of arbitrary implicit functions.

关键词： Haptic interfaces Equations Spline Solid modeling Polynomials Shape control Virtual environment computer science computer graphics Visualization

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Low cost immersive displays: the cubicle of the future

Low cost immersive displays: the cubicle of the future

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pacific conference on computer graphics and applications

作者： M. Green Department of Computing Science University of Alberta Edmonton AB Canada

A number of immersive display technologies have been developed over the past decade. While many of these display technologies have proved to be effective, they are still far too expensive for common use. This paper presents a low cost immersive display device called Vision Space. This device can be viewed as a personal immersive workspace that takes the form of an office cubicle.

关键词： Costs Space technology computer displays Three dimensional displays Space exploration Application software Consumer products Production Image generation Hardware

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A physical 3D trackball

A physical 3D trackball

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pacific conference on computer graphics and applications

作者： Myung-Soo Kim Joon-Kyung Seong Dae-Eun Hyun Kang-Hoon Lee Yoo-Jin Choi Seoul National University South Korea School of Computer Science and Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0769512275

We present a simple method for constructing a physical 3D trackball that can input 3D rotation about an arbitrary axis. This input device is based on multiple sensors that can detect the tangential velocities at certain points on the boundary sphere of the trackball. A mathematical analysis is given for the optimal locations of multiple sensors. A prototype hardware device has been built for the 3D trackball. We demonstrate the effectiveness of this input device in 3D rotation by comparing its performance with the Magellan/SPACE MOUSE.

关键词： Multidimensional systems Optical sensors Sensor systems Hardware Mice Quaternions Usability Face detection Angular velocity Equations

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A simple layered RGB BRDF model

A simple layered RGB BRDF model

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pacific conference on computer graphics and applications

作者： X. Granier W. Heidrich Department of Computer Science IMAGER University of British Columbia Vancouver BC Canada

Many natural objects, and general layered materials, have non-linear reflection behaviour along wavelengths. An accurate representation of phenomena such as interference and colour separation generally requires a fine spectral representation of light instead of the commonly used RGB components. In this article, we introduce and experiment with a general approach to create similar and convincing effects, with a simple RGB BRDF model. We present a model for both specular and diffuse reflection.

关键词： Optical reflection Interference Computational modeling Solid modeling Lighting computer graphics Surface waves computer science Bidirectional control Reflectivity

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Bounded clustering-finding good bounds on clustered light transport

Bounded clustering-finding good bounds on clustered light tr...

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pacific conference on computer graphics and applications

作者： M. Stamminger P. Slusallek H.P. Seidel Computer Graphics Group University of Erlangen Germany

Clustering is a very efficient technique to apply finite element methods to the computation of radiosity solutions of complex scenes. Both computation time and memory consumption can be reduced dramatically by grouping the primitives of the input scene into a hierarchy of clusters and allowing for light exchange between all levels of this hierarchy. However, problems can arise due to clustering, when gross approximations about a cluster's content result in unsatisfactory solutions or unnecessary computations. In the clustering approach for diffuse global information described in the paper, light exchange between two objects-patches or clusters-is bounded by using geometrical and shading information provided by every object through a uniform interface. With this uniform view of various kinds of objects, comparable and reliable error bounds on the light exchange can be computed, which then guide a standard hierarchical radiosity algorithm.

关键词： Clustering algorithms Layout computer graphics Lighting computer errors Computational modeling Design methodology Light scattering

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Cross-Parameterization for Triangular Meshes with Semantic Features

Cross-Parameterization for Triangular Meshes with Semantic F...

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pacific conference on computer graphics and applications

作者： Shun Matsui Kota Aoki Hiroshi Nagahashi Ken'ichi Morooka Tokyo Institute of Technology Japan Kyushu University Japan

ISBN: (纸本)9780769530093;0769530095

In 3D computer graphics, mesh parameterization is a key technique for digital geometry processings(DGP) such as morphing, shape blending, texture transfer, re-meshing and so on. This paper proposes a novel approach for parameterizing a mesh into another one directly. The main idea of our method is to combine a competitive learning and a leastsquare mesh techniques. It is enough to give some semantic feature correspondences between target meshes, even if they are in different shapes or in different poses. We show the effectiveness of our approach by giving some examples of its applications.

关键词： Mesh generation Shape computer graphics Application software Computational geometry Robustness Surface reconstruction Equations

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Parallel implementation of the wideband Coherent Signal-Subspace (CSS) based DOA algorithm on single core, multicore and GPU

Parallel implementation of the wideband Coherent Signal-Subs...

引用

45th Asilomar conference on Signals, Systems and computers, ASILOMAR 2011

作者： Wadood Majid, Mohammad Jamali, Mohsin M. Department of Electrical Engineering and Computer Science University of Toledo Toledo United States

ISBN: (纸本)9781467303231

Computation of Wideband Coherent Signal-Subspace (CSS) Based Direction of Arrival (DOA) has been parallelized and implemented on Multicore (Intel Nehalem Quad Core) and NVIDIA's GPU. This is in an effort to its use for real time applications. The CSS algorithm has been parallelized, partitioned, mapped and scheduled on Multi-Core/GPU. The parallel algorithm is developed in C# and a combination of C and CUDA for Multi-Core and GPU respectively. The algorithm has also been implemented on single core for comparison purposes. Wideband CSS algorithm is implemented assuming 16 and 4 sensors using Uniform Linear Array (ULA). © 2011 IEEE.

关键词： graphics processing unit

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Live participant's action recognition for virtual reality interactions

Live participant's action recognition for virtual reality in...

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pacific conference on computer graphics and applications

作者： L. Emering R. Boulic D. Thalmann LIG-Computer Graphics Laboratory Swiss Federal Institute of Technology Lausanne Switzerland

The recognition of daily human activities is a decisive interface component for more intuitive virtual reality (VR) interactions. In this paper, we describe a hierarchical model of body actions based on fine-grained action primitives. The associated recognition algorithm allows on-the-fly identification of simultaneous actions. Measurements highlight robustness to participants' variability and high detection rates when using the full potential of the action model. An example illustrates an interaction with a virtual character driven by the participant's action recognition.

关键词： Virtual reality Humans Biological system modeling Character recognition Robustness Magnetic sensors computer graphics Particle measurements Surges Handicapped aids

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