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10th pacific conference on computer graphics and applications

作者： Ahn, M Lee, SY Pohang Univ Sci & Technol POSTECH Dept Comp Sci & Engn Pohang 790784 South Korea

ISBN: (纸本)0769517846;0769517854

3D mesh morphing based on a metamesh has fundamental limitations of complicated in-between meshes and no topology (connectivity) changes in a metamorphosis. This paper presents a novel approach for 3D mesh morphing, which is not based on a metamesh. The approach simultaneously interpolates the topology and geometry of input meshes. In our approach, an in-between mesh contains only the vertices from the source and target meshes. Since no additional vertices are introduced, the in-between meshes are much simpler than those generated by previous techniques.

关键词： Animation Application software computer graphics computer science Geometry Interpolation Mesh generation Topology

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Simulating wax crayons 11

Simulating wax crayons

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11th pacific conference on computer graphics and applications

作者： Rudolf, D Mould, D Neufeld, E Univ Saskatchewan Dept Comp Sci Saskatoon SK S7N 0W0 Canada

ISBN: (纸本)0769520286

We present a physically-inspired model of wax crayons, which synthesizes drawings from collections of user-specified strokes. Paper is represented by a height-field texture, and a crayon is modelled with a 2D mask that evolves as it interacts with the paper. The amount of wax deposition is computed based on the crayon contact profile, contact force, and friction. Previously deposited wax is smeared by crayon action, based on wax softness and contact information. The distributed wax is rendered using a simplified Kubelka-Monk model, which approximates light transmittance and scattering effects.

关键词： Computational modeling computer science Friction Geometry Image processing Light scattering Painting Petroleum Rendering (computer graphics) Shape

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Neural Meshes: Statistical learning based on normals 11

Neural Meshes: Statistical learning based on normals

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11th pacific conference on computer graphics and applications

作者： Jeong, WK Ivrissimtzis, IP Seidel, HP Univ Utah Salt Lake City UT 84112 USA

ISBN: (纸本)0769520286

We present a method for the adaptive reconstruction of a surface directly from an unorganized point cloud. The algorithm is based on an incrementally expanding Neural Network and the statistical analysis of its Learning process. In particular, we make use of the simple observation that during the Learning process the normal of a vertex near a sharp edge or a high curvature area of the target space, statistically, will vary more than the normal of a vertex near a flat area. We use the information obtained from the study of these normal variations to steer the Learning process in an adaptive meshing application, producing meshes with more triangles near the high curvature areas. The same information is used in a feature detection application.

关键词： Application software Clouds computer graphics computer vision Geometry Neural networks Reconstruction algorithms Statistical analysis Statistical learning Surface reconstruction

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Segmentation of 3D meshes through spectral clustering

Segmentation of 3D meshes through spectral clustering

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

作者： Liu, R Zhang, H Simon Fraser Univ Sch Comp Sci GrUVi Lab Burnaby BC V5A 1S6 Canada

ISBN: (纸本)0769522343

We formulate and apply spectral clustering to 3D mesh segmentation for the first time and report our preliminary findings. Given a set of mesh faces, an affinity matrix which encodes the likelihood of each pair of faces belonging to the same group is first constructed. Spectral methods then use selected eigenvectors of the affinity matrix or its closely related graph Laplacian to obtain data representations that can be more easily clustered. We develop an algorithm that favors segmentation along concave regions, which is inspired by human perception. Our algorithm is theoretically sound, efficient, simple to implement, and can achieve high quality segmentation results on 3D meshes.

关键词： computer graphics

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Semi-Automatic Conversion of 3D Shape into Flat-Foldable Polygonal Model

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computer graphics FORUM 2017年第7期36卷 41-50页

作者： Miyamoto, Emi Endo, Yuki Kanamori, Yoshihiro Mitani, Jun Univ Tsukuba Tsukuba Ibaraki Japan

This paper presents a method that can convert a given 3D mesh into a flat-foldable model consisting of rigid panels. A previous work proposed a method to assist manual design of a single component of such flat-foldable model, consisting of vertically-connected side panels as well as horizontal top and bottom panels. Our method semi-automatically generates a more complicated model that approximates the input mesh with multiple convex components. The user specifies the folding direction of each convex component and the fidelity of shape approximation. Given the user inputs, our method optimizes shapes and positions of panels of each convex component in order to make the whole model flat-foldable. The user can check a folding animation of the output model. We demonstrate the effectiveness of our method by fabricating physical paper prototypes of flat-foldable models.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.5 [computer graphics]: Computational Geometry and Object Modeling—Physically based modeling

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Visual Contrast Sensitivity and Discrimination for 3D Meshes and their applications

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computer graphics FORUM 2016年第7期35卷 497-506页

作者： Nader, G. Wang, K. Hetroy-Wheeler, F. Dupont, F. Univ Lyon LIRIS UMR CNRS 5205 Lyon France Univ Grenoble Alpes CNRS GIPSA Lab F-38000 Grenoble France Univ Grenoble Alpes LJK F-38000 Grenoble France Inria Rocquencourt France

In this paper, we first introduce an algorithm for estimating the visual contrast on a 3D mesh. We then perform a series of psychophysical experiments to study the effects of contrast sensitivity and contrast discrimination of the human visual system for the task of differentiating between two contrasts on a 3D mesh. The results of these experiments allow us to propose a perceptual model that is able to predict whether a change in local contrast on 3D mesh, induced by a local geometric distortion, is visible or not. Finally, we illustrate the utility of the proposed perceptual model in a number of applications: we compute the Just Noticeable Distortion (JND) profile for smooth-shaded 3D meshes and use the model to guide mesh processing algorithms.

关键词： Mesh networks Three-dimensional imaging Imaging systems Texture mapping Digital image processing Image analysis

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Anisotropic Superpixel Generation Based on Mahalanobis Distance

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computer graphics FORUM 2016年第7期35卷 199-207页

作者： Cai, Yiqi Guo, Xiaohu Univ Texas Dallas Dallas TX 75080 USA

Superpixels have been widely used as a preprocessing step in various computer vision tasks. Spatial compactness and color homogeneity are the two key factors determining the quality of the superpixel representation. In this paper, these two objectives are considered separately and anisotropic superpixels are generated to better adapt to local image content. We develop a unimodular Gaussian generative model to guide the color homogeneity within a superpixel by learning local pixel color variations. It turns out maximizing the log-likelihood of our generative model is equivalent to solving a Centroidal Voronoi Tessellation (CVT) problem. Moreover, we provide the theoretical guarantee that the CVT result is invariant to affine illumination change, which makes our anisotropic superpixel generation algorithm well suited for image/video analysis in varying illumination environment. The effectiveness of our method in image/video superpixel generation is demonstrated through the comparison with other state-of-the-art methods.

关键词： computer vision GAUSSIAN distribution PIXELS DIGITAL images IMAGE processing RESOLUTION (Optics) CENTROIDAL Voronoi tessellations VORONOI polygons

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Hardware-accelerated reconstruction of polygonal isosurface representations on unstructured grids

Hardware-accelerated reconstruction of polygonal isosurface ...

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

作者： Klein, T Stegmaier, S Ertl, T Univ Stuttgart Inst Visualizat & Interact Syst D-70569 Stuttgart Germany

ISBN: (纸本)0769522343

Volume visualization using isosurface extraction is a well-researched topic. Recent research demonstrated that even for unstructured grids peak performances of millions of tetrahedra per second can be achieved by exploiting the parallel processing capabilities of modem GPUs. In this paper we present a novel hardware-accelerated solution that further improves the extraction performance. In contrary to existing approaches, our technique explicitly extracts the isosurface geometry in a fragment program by rendering only a single screen-sized quadrilateral. The extracted geometry is directly written to an on-board graphics memory object allowing for direct rendering without further bus transfers. Additionally, the geometry can be manipulated by shader programs or read back to the application for further processing. Examples and application scenarios are given that can benefit from our approach.

关键词： computer graphics

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Part-type Segmentation of Articulated Voxel-Shapes using the Junction Rule

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computer graphics FORUM 2008年第7期27卷 1845-1852页

作者： Reniers, Dennie Telea, Alexandru Eindhoven Univ Technol Dept Math & Comp Sci NL-5600 MB Eindhoven Netherlands Univ Groningen Inst Math & Comp Sci NL-9700 AB Groningen Netherlands

We present a part-type segmentation method for articulated voxel-shapes based on curve skeletons. Shapes are considered to consist of several simpler, intersecting shapes. Our method is based on the junction rule : the observation that two intersecting shapes generate an additional junction in their joined curve-skeleton near the place of intersection. For each curve-skeleton point, we construct a piece wise-geodesic loop on the shape surface. Starting from the junctions, we search along the curve skeleton for points whose associated loops make for suitable part cuts. The segmentations are robust to noise and discretization artifacts, because the curve skeletonization incorporates a single user-parameter to filter spurious curve-skeleton branches. Furthermore, segment borders are smooth and minimally twisting by construction. We demonstrate our method on several real-world examples and compare it to existing part-type segmentation method.

关键词： I.3.5 [computer graphics]: Geometric algorithms languages and systems

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Using texture synthesis for non-photorealistic shading from paint samples 11

Using texture synthesis for non-photorealistic shading from ...

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11th pacific conference on computer graphics and applications

作者： Kulla, CD Tucek, JD Bailey, RJ Grimm, CM Washington Univ St Louis MO 63130 USA

ISBN: (纸本)0769520286

This paper presents several methods for shading meshes from scanned paint samples that represent dark to light transitions. Our techniques emphasize artistic control of brush stroke texture and color. We first demonstrate how the texture of the paint sample can be separated from its color gradient. We demonstrate three methods, two real-time and one off-line, for producing rendered, shaded images from the texture samples. All three techniques use texture synthesis to generate additional paint samples. Finally, we develop metrics for evaluating how well each method achieves our goal in terms of texture similarity;shading correctness and temporal coherence.

关键词： Animation Application software Brushes computer graphics Nonlinear distortion Painting Paints Rendering (computer graphics) Shape Strips

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