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8th pacific conference on computer graphics and applications

作者： Takeuchi, S Kanai, T Suzuki, H Shimada, K Kimura, F Univ Tokyo Dept Precis Engn Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)0769508685

We present a general method for automatically reconstructing a network of B-spline patches based on the Doo-Sabin subdivision surface. This method consists of two parts, surface fitting and surface construction. In surface fitting, mesh simplification based on QEM (Quadric Error Metrics) is used and a control mesh that approximates a Doo-Sabin subdivision surface is constructed. In surface construction, rye define a B-spline surface using a surface spline method;and a constructed network of B-spline patches is guaranteed G(1) continuous. In addition, this method has the advantage of enabling the user to select detail levels of the control mesh by utilizing a mesh simplification process.

关键词： computer graphics geometric modeling subdivision surface surface fitting mesh simplification

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Piecewise-planar Reconstruction of Multi-room Interiors with Arbitrary Wall Arrangements

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computer graphics FORUM 2016年第7期35卷 179-188页

作者： Mura, C. Mattausch, O. Pajarola, R. Univ Zurich Dept Informat Visualizat & MultiMedia Lab Zurich Switzerland Swiss Fed Inst Technol Comp Vis Lab Zurich Switzerland

Reconstructing the as-built architectural shape of building interiors has emerged in recent years as an important and challenging research problem. An effective approach must be able to faithfully capture the architectural structures and separate permanent components from clutter (e.g. furniture), while at the same time dealing with defects in the input data. For many applications, higher-level information on the environment is also required, in particular the shape of individual rooms. To solve this ill-posed problem, state-of-the-art methods assume constrained input environments with a 2.5D or, more restrictively, a Manhattan-world structure, which significantly restricts their applicability in real-world settings. We present a novel pipeline that allows to reconstruct general 3D interior architectures, significantly increasing the range of real-world architectures that can be reconstructed and labeled by any interior reconstruction method to date. Our method finds candidate permanent components by reasoning on a graph-based scene representation, then uses them to build a 3D linear cell complex that is partitioned into separate rooms through a multi-label energy minimization formulation. We demonstrate the effectiveness of our method by applying it to a variety of real-world and synthetic datasets and by comparing it to more specialized state-of-the-art approaches.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.5 [computer graphics]: Computational Geometry and Object Modeling&mdash Boundary representationsCurve surface solid and object representations

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Scam light field rendering 10

Scam light field rendering

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10th pacific conference on computer graphics and applications

作者： Yu, JY McMillan, L Gortler, S MIT Comp Sci Lab Cambridge MA 02139 USA

ISBN: (纸本)0769517846;0769517854

In this paper we present a new variant of the light field representation that supports improved image reconstruction by accommodating sparse correspondence information. This places our representation somewhere between a pure, two-plane parameterized, light field and a lumigraph representation, with its continuous geometric proxy. Our approach factors the rays of a light field into one of two separate classes. All rays consistent with a given correspondence are implicitly represented using a new auxiliary data structure, which we call a surface camera, or scam. The remaining rays of the light field are represented using a standard two-plane parameterized light field. We present an efficient rendering algorithm that combines ray samples from scams with those from the light field. The resulting image reconstructions are noticeably improved over that of a pure light field.

关键词： Application software computer graphics

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Practical texture mapping on free-form surfaces 8

Practical texture mapping on free-form surfaces

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8th pacific conference on computer graphics and applications

作者： Iwakiri, Y Omori, Y Kanko, T Toyohashi Univ Technol Dept Informat & Comp Sci Toyohashi Aichi 4418580 Japan

ISBN: (纸本)0769508685

This paper is concerned with the problem of mapping photographic images onto the surface of a 3D object whose geometric data are already known. Although the minimal view selection algorithm by Matsushita and Kaneko [II] enables the selection of a minimal number of camera positions, it often results into un-textured patches due to camera misalignment: a deviation of actual camera position from the specified position. This paper proposes two new practical algorithms (double and product viewing) to ensure all the polygons to be textured even if there are unavoidable human errors in camera alignment. The performance of the algorithms is evaluated by simulation experiments.

关键词： Cameras Computational modeling computer errors Geometrical optics Geometry Humans Shape measurement Solid modeling Surface texture TV

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A method to generate wet and broken-up animal fur 7

A method to generate wet and broken-up animal fur

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7th pacific conference on computer graphics and applications (pacific graphics 99)

作者： Bruderlin, A Sony Pictures Imageworks Culver City CA 90232 USA

ISBN: (纸本)0769502938

This paper describes part of the pipeline which we have implemented for the creation of hair and fur for the motion picture Stuart Little. In particular;we discuss the two effects of producing wet fur and broken-up dry fur We assume that our animal models consist of a connected set of NURBS patches, which define the skin onto which the individual hairs are placed. A wet fur look is achieved by clumping together of neighboring hairs within certain clumping nl ens on the skirt. The definition of these clumping areas can be either static or animated, the latter to simulate spouts of water hitting parts of the fur cent, at making it increasingly wet. A broken-up fur look is generated breaking of hairs along cel-tain fur-tracks on the skin. Copyright (C) 2000 John Wiley & Sons, Ltd.

关键词： computer animation hair fur natural phenomena special effects

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ISpace: Interactive volume data classification techniques using independent component analysis 10

ISpace: Interactive volume data classification techniques us...

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10th pacific conference on computer graphics and applications

作者： Takanashi, I Lum, EB Ma, KL Muraki, S Information Technology R and D Center Mitsubishi Electric Corporation Japan CIPIC Department of Computer Science University of California Davis United States National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan

ISBN: (纸本)0769517846;0769517854

This paper introduces an interactive classification technique for volume data, called ISpace, which uses Independent Component Analysis (ICA) and a multidimensional histogram of the volume data in a transformed space. Essentially, classification in the volume domain becomes equivalent to interactive clipping in the ICA space, which as demonstrated using several examples is more intuitive and direct for the user to classify data. The result is an opacity transfer function defined for rendering multivariate scalar volume data.

关键词： histogram image processing independent component analysis medical imaging multivariate data analysis multimodality data scientific visualization segmentation volume rendering

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Harmonic Functions for Rotational Symmetry Vector Fields

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computer graphics FORUM 2016年第7期35卷 507-516页

作者： Shen, Zhongwei Fang, Xianzhong Liu, Xinguo Bao, Hujun Huang, Jin Zhejiang Univ State Key Lab CAD&CG Hangzhou Zhejiang Peoples R China

Representing rotational symmetry vector as a set of vectors is not suitable for design due to lacking of a consistent ordering for measurement. In this paper we introduce a spectral method to find rotation invariant harmonic functions for symmetry vector field design. This method is developed for 3D vector fields, but it is applicable in 2D. Given the finite symmetry group G of a symmetry vector field v(x) on a 3D domain Omega, we formulate the harmonic function h (s) as a stationary point of group G. Using the real spherical harmonic (SH) bases, we showed the coefficients of the harmonic functions are an eigenvector of the SH rotation matrices corresponding to group G. Instead of solving eigen problems to obtain the eigenvector, we developed a forward constructive method based on orthogonal group theory. The harmonic function found by our method is not only invariant under G, but also expressive and can distinguish different rotations with respect to G. At last, we demonstrate some vector field design results with tetrahedron-symmetry, cube-symmetry and dodecahedron-symmetry groups.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.5 [computer graphics]: Computational Geometry and Object Modeling&mdash Geometric algorithms

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Temporally Coherent and Artistically Intended Stylization of Feature Lines Extracted from 3D Models

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computer graphics FORUM 2016年第7期35卷 137-146页

作者： Cardona, L. Saito, S. Tokyo Inst Technol Tokyo Japan

In this paper, we propose a method to maintain the temporal coherence of stylized feature lines extracted from 3D models and preserve an artistically intended stylization provided by the user. We formally define the problem of combining spatio-temporal continuity and artistic intention as a weighted energy minimization problem of competing constraints. The proposed method updates the style properties to provide real-time smooth transitions from current to goal stylization, by assuring first- and second-order temporal continuity, as well as spatial continuity along each stroke. The proposed weighting scheme guarantees that the stylization of strokes maintains motion coherence with respect to the apparent motion of the underlying surface in consecutive frames. This weighting scheme emphasizes temporal continuity for small apparent motions where the human vision system is able to keep track of the scene, and prioritizes the artistic intention for large apparent motions where temporal coherence is not expected. The proposed method produces temporally coherent and visually pleasing animations without the flickering artifacts of previous methods, while also maintaining the artistic intention of a goal stylization provided by the user.

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

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An automatic modeling method for fitting volumetric objects with metacubes 8

An automatic modeling method for fitting volumetric objects ...

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8th pacific conference on computer graphics and applications

作者： Kim, ES Kim, JJ Chonnam Natl Univ Dept Comp Sci Buk Ku Kwangju South Korea

ISBN: (纸本)0769508685

The implicit modeling is an important technique in modeling of informal objects. However the automatic modeling algorithms with the implicit skeletal elements are not very advanced. In this paper we propose a new skeletal element, Metacube and an automatic modeling technique for informal objects represented by volumetric data. Metacube has the merits of metaball and also enhances the modeling ability of informal objects containing the planar surfaces. For 256 x 256 x 256 size of input volume, the proposed method takes a short generation time within ten minutes on an SGI indigo2 workstation.

关键词： computer science Data mining Deformable models Isosurfaces Ray tracing Shape Surface fitting Workstations

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Piecewise smooth reconstruction of normal vector field on digital data

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computer graphics FORUM 2016年第7期35卷 157-167页

作者： Coeurjolly, David Foare, Marion Gueth, Pierre Lachaud, Jacques-Olivier Univ Lyon CNRS LIRIS UMR 5205 F-69622 Lyon France Univ Savoie Mont Blanc UMR 5127 CNRS Lab Math Chambery France

We propose a novel method to regularize a normal vector field defined on a digital surface (boundary of a set of voxels). When the digital surface is a digitization of a piecewise smooth manifold, our method localizes sharp features (edges) while regularizing the input normal vector field at the same time. It relies on the optimisation of a variant of the Ambrosio-Tortorelli functional, originally defined for denoising and contour extraction in image processing [AT90]. We reformulate this functional to digital surface processing thanks to discrete calculus operators. Experiments show that the output normal field is very robust to digitization artifacts or noise, and also fairly independent of the sampling resolution. The method allows the user to choose independently the amount of smoothing and the length of the set of discontinuities. Sharp and vanishing features are correctly delineated even on extremely damaged data. Finally, our method can be used to enhance considerably the output of state-of-the-art normal field estimators like Voronoi Covariance Measure [MOG11] or Randomized Hough Transform [BM12].

关键词： Categories and Subject Descriptors (according to ACM CCS) [computer graphics]: Modeling - Digital Geometry Processing&mdash Modeling - Shape Analysis

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