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Adaptive parameterization for reconstruction of 3D freeform objects from laser-scanned data 7

Adaptive parameterization for reconstruction of 3D freeform ...

引用

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

作者： Fischer, A. Manor, A. Barhak, Y. CMSR Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion - Israel Institute of Technology Haifa32000 Israel

ISBN: (纸本)0769502938

This paper proposes a new adaptive parametrization method to overcome the problems of using laser scanners in Reverse Engineering. The method is based on the following stages: (a) Detecting a 3D boundary of the parametric base surface by matching an intensity image from a CCD camera with the scanned data. (b) Adaptively reconstructing a parametric base surface with a non-self intersecting grid, based on a PDE method (c) Calculating the parametrization of the 3D sampled points. (d) Fitting the surface by applying a least square (LSQ) approximation method with boundary constraints. The feasibility of the parametrization algorithm is demonstrated on several examples using sculptured free objects. © 1999 IEEE.

关键词： Reverse engineering

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A discrete spring model for generating fair curves and surfaces 7

A discrete spring model for generating fair curves and surfa...

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

作者： Yamada, Atsushi Shimada, Kenji Furuhata, Tomotake Hou, Ko-Hsiu Tokyo Research Laboratory IBM Japan Ltd. LAB-S73 623-14 Yamato Kanagawa242-8502 Japan Mechanical Engineering Carnegie Mellon University PittsburghPA15213 United States

ISBN: (纸本)0769502938

The ability to generate fair curves and surfaces is important in computer graphics (CG), computer-aided design (CAD), and other geometric modeling applications. In this paper, we present an iteration-based algorithm for generating fair polygonal curves and surfaces that is based on a new discrete spring model. In the spring model, a linear spring, whose length approximately represents a curvature radius, is attached along the normal line of each polygon node. Energy is assigned to the difference of the lengths, that is, the difference in curvature radius, of neighboring springs. Our algorithm then minimizes the total energy by an iterative approach. It accepts as inputs (1) an initial polygonal curve (surface), which consists of a set of polygonal segments (faces) and a set of nodes as polygon-vertices, and (2) constraints for controlling the shape. The outputs are polygonal curves (surfaces) with smooth shapes. We also describe a method for improving the performance of our iterative process to obtain a linear execution time. Our algorithm provides a tool for the fair curve and surface design in an interactive environment. © 1999 IEEE.

关键词： computer aided design

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Multiresolution constraints for designing subdivision surfaces via local smoothing 7

Multiresolution constraints for designing subdivision surfac...

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

作者： Takahashi, Shigeo Computer Center Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan

ISBN: (纸本)0769502938

Subdivision surfaces provide an efficient means of representing surfaces of arbitrary topological type. In recent years, multiresolution modeling with variational smoothing has played an important role in controlling such surfaces. This paper presents a new model of multiresolution constraints that can be applied to subdivision surfaces. The advantage of this model is that different geometric constraints can be imposed on the surfaces at different resolution levels. The model employs the wavelet-based framework of Lounsbery, et al. (1997), to represent the subdivision surfaces in a hierarchical fashion. In the proposed framework, local smooth filtering is used to obtain the optimal surface shape at each resolution level. Controlling the number of iterations for the local smoothing operations allows us to modify the smoothness of the subdivision surfaces even when the same set of constraints is given. Several design examples are included to demonstrate the capability of this model. © 1999 IEEE.

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Volumetric modeling of colored pencil drawing 7

Volumetric modeling of colored pencil drawing

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

作者： Takgi, Saeko Fujishiro, Issei Nakajima, Masayuki Department of Computer Science Tokyo Institute of Technology 2-12-1 O-okayama Meguro-ku Tokyo152-8552 Japan Department of Information Sciences Ochanomizu University 2-1-1 Otsuka Bunkyo-ku Tokyo112-8610 Japan

ISBN: (纸本)0769502938

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. © 1999 IEEE.

关键词： Rendering (computer graphics)

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A scan line algorithm for rendering curved tubular objects 7

A scan line algorithm for rendering curved tubular objects

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

作者： Nishita, Tomoyuki Johan, Henry Department of Information Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan

ISBN: (纸本)0769502938

Parametric surfaces and implicit surfaces are generally used for representing curved surfaces in CAD/CG Systems. This paper discusses a curved tubular object which is a surface swept by a sphere/circle moving along a curve. For the trajectory curve, a 3D Bezier curve is employed, and its radius can be varied along the curve. In general, its surface cannot be defined by a closed form, while a high degree of polynomial must be solved for ray/surface intersection. This paper proposes an effective rendering method which uses a scan line algorithm for detecting curved tubular objects on the projection plane. The calculation of the distance from a point to a curve plays an important role in our algorithm. Bezier Clipping Method is employed for this calculation. © 1999 IEEE.

关键词： computer aided design

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Network-centric feature-based modeling 7

Network-centric feature-based modeling

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

作者： Lee, Jae Yeol Han, Sung Bae Kim, Hyun Park, Sang Bong 161 Kajong-Dong Yusong-Gu Taejon305-350 Korea Republic of

ISBN: (纸本)0769502938

Network and Internet technology opens up another domain for building future CAD/CAM environments. The environment will be global, network-centric, and spatially distributed. We present an approach for network-centric feature-based modeling in a distributed design environment. The presented approach combines the current feature-based modeling technique with distributed computing and communication technology for supporting product modeling and collaborative design activities over the network. The approach is implemented in a client/server architecture, in which Web-enabled feature modeling clients, neutral feature model server, and other applications communicate with one another via a standard communication protocol. The paper discusses how the neutral feature model supports multiple views and maintains naming consistency between geometric entities of the server and clients. Moreover, it explains how to minimize the network delay between the server and client according to incremental feature modeling operations. © 1999 IEEE.

关键词： computer aided design

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An improved TIN compression using Delaunay triangulation 7

An improved TIN compression using Delaunay triangulation

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

作者： Kim, Yang-Soo Park, Dong-Gyu Jung, Ho-Youl Cho, Hwan-Gue Dong, Jang-Jun Ku, Keum-Jung Department of Computer Science Pusan Nation University Keum-Jung Ku Pusan609-735 Korea Republic of

ISBN: (纸本)0769502938

In this paper we introduce a new compression technique for the connectivity of a Triangulated Irregular Network (TIN) by using Delaunay triangulation. The strategy in this paper is based on that most of 2.5 dimensional terrain connection are very similar to plane-projected Delaunay triangulation of their vertex set. We only need to keep the vertex coordinates and a few edges that are not included in the Delaunay edges. We present an efficient encoding method for the set of edges using vertex reordering and general bracketing algorithm. Also we propose progressive visualization method for web-based GIS. In the experiments, the method was examined on several TIN data with various resolutions, which were generated by five typical terrain simplification algorithms. The connectivity information of common terrain data could be compressed by 0.23 bits per vertex. © 1999 IEEE.

关键词： Triangulation

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A multiscale deformable model for extracting complex surfaces from volume images 7

A multiscale deformable model for extracting complex surface...

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

作者： Park, Joo-Young McInerney, Tim Terzopoulos, Demetri Kim, Myoung-Hee Department of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Department of Computer Science Ryerson Polytechnic University Toronto Canada Department of Computer Science University of Toronto Toronto Canada

ISBN: (纸本)0769502938

Deformable surface models are an attractive method for segmenting the three-dimensional shapes of complex anatomic structures in volumetric medical images. Despite the success of this approach, several problems remain. In this paper, we propose a multiscale deformable surface model with non-intersection constraint forces that successfully addresses three significant problems-sensitivity to model initialization, difficulties in dealing with severe object concavities, and model self-intersection. The first two problems are addressed by the multiscale scheme, which progressively resamples the triangulated, deformable surface model both globally and locally, matching its resolution to the levels of a volume image pyramid. We address the third problem by including a non-intersection constraint force among the customary internal and external forces in the physics-based formulation. We apply our new deformable surface model to the challenging task of extracting brain cortical surfaces. © 1999 IEEE.

关键词： Brain

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An efficient wavelet-based compression method for volume rendering 7

An efficient wavelet-based compression method for volume ren...

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

作者： Kim, Tae-Young Shin, Yeong Gil Department of Computer Science Seoul National University San 56-1 Shinlim-Dong Kwanak-Gu Seoul151-742 Korea Republic of

ISBN: (纸本)0769502938

Since volume rendering needs a lot of computation time and memory space, many researches have been suggested for accelerating rendering or reducing data size using compression techniques. However, there is little progress in a research for accomplishing these goals. This paper presents an efficient wavelet-based compression method providing fast visualization of large volume data, which is divided into individual blocks with regular resolution. Wavelet transformed block is runlength encoded in accordance with the reconstruction order resulting in a fairly good compression ratio and fast reconstruction. A cache data structure is designed to speed up the reconstruction, and an adaptive compression scheme is proposed to produce a higher quality rendered image. The compression method proposed here is combined with several accelerated volume rendering algorithms, such as brute-force volume rendering with min-max table and Lacroute's shear-warp factorization. Experimental results have shown the space requirement to be about 1/27 and the rendering time to be about 3 seconds for 512×512×512 data sets while preserving the quality of an image much like using the original data. © 1999 IEEE.

关键词： Volume rendering

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Automatic camera placement for image-based modeling 7

Automatic camera placement for image-based modeling

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

作者： Fleishman, Shachar Cohen-Or, Daniel Lischinski, Dani Computer Science Department Tel-Aviv University Ramat-Aviv69978 Israel Institute of Computer Science Hebrew University Jerusalem91904 Israel

ISBN: (纸本)0769502938

We present an automatic camera placement method for generating image-based models from scenes with known geometry. Our method first approximately determines the set of surfaces visible from a given viewing area and then selects a small set of appropriate camera positions to sample the scene from. We define a quality measure for a surface as seen, or covered, from the given viewing area. Along with each camera position, we store the set of surfaces which are best covered by this camera. Next, one reference view is generated from each reference view that do not belong to the selected set of polygons are masked out. The image-based model generated by our method, covers every visible surface only once, associating it with a camera position from which it is covered with quality that exceeds a user-specified quality threshold. The result is a compact non-redundant image-based model with controlled quality. The problem of covering every visible surface with a minimum number of cameras (guards) can be regarded as an extension to the well-known Art Gallery Problem. However, since the 3D polygonal model is textured, the camera-polygon visibility relation is not binary;instead, it has a weight-the quality of the polygon's coverage. © 1999 IEEE.

关键词： Cameras

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