检索结果-内蒙古大学图书馆

International Conference on Ubiquitous Communication (Ucom)

作者： Huang, Haidi Sun, Zhe Zou, Wenjie Lv, Zhuoyi Xidian Univ Sch Telecommun Engn Xian Peoples R China Vivo Mobile Commun Co Ltd Beijing Peoples R China

ISBN: (纸本)9798350374223;9798350374216

The emergence of immersive video concepts like the Metaverse has increased the importance of 3D meshes in various fields. Given that 3D mesh compression facilitates storing and transmitting a large amount of data from 3D meshes, it is a crucial aspect of their application. The Moving Picture Experts Group (MPEG) is developing a standard known as Video-based Dynamic mesh Coding (V-DMC), aimed at dynamic meshes with high-precision attribute information. As a type of information representing surface texture or material properties of 3D meshes, the attribute information significantly influences the subjective quality of the 3D model. In the V-DMC framework, the encoding of attribute information involves mesh parameterization, which is used to regenerate texture coordinates. One of the adopted mesh parameterization methods, i.e., OrthoAtlas, has the advantage of low time complexity. In this paper, an optimization scheme is proposed for OrthoAtlas. Specially, considering the issue of inaccurate projection planes for patches, the optimal projection planes are determined by recalculating the normal vectors of the patches. Furthermore, to enhance coding efficiency, it is integrated with rate-distortion optimization to decide whether to merge patches. Experimental results show that the proposed methods can improve the performance in terms of BD-Rate. The proposed methods have been adopted by the V-DMC standard and integrated into the MPEG V-DMC reference software.

关键词： mesh compression mesh parameterization OrthoAtlas attribute V-DMC

来源：评论

学校读者我要写书评

暂无评论

mesh parameterization using elastic FEM with negative Poisson's ratio material and triangle shape transformation

引用

COMPUTER-AIDED DESIGN 2023年第1期160卷

作者： Kong, Haijiao Zhang, Zhibing Liu, Yuqi Wang, Zhen Wei, Yang Li, Qiaomin Huazhong Univ Sci & Technol State Key Lab Mat Proc & Die & Mould Technol Wuhan 430074 Peoples R China Wuhan Text Univ Wuhan 430074 Peoples R China

Linear mesh parameterization method with a free boundary is an attractive technology and a ubiquitous tool that is widely used in computer graphics and geometry processing. The existing methods always have the shortcoming of element flipping. In this study, a novel linear mesh parameterization method with a free boundary is proposed based on the linear elastic finite element model of a material with negative Poisson's ratio. With appropriate parameter settings, the method can flatten a 3D mesh without element flipping to the most extent. The proposed method is divided into two steps: (1) each element of the 3D mesh is compressed to the origin point;(2) the degenerated mesh is gradually expanded in a plane under the two forces of equal magnitude and opposite directions based on a finite element model of an elastic membrane material with negative Poisson's ratio. Subsequently, the causes of element flipping are analyzed at internal nodes and boundary nodes. The triangle shape transformation (TST) method is proposed to solve the problem of internal element flipping, and the stiffness enhancement method is presented to overcome the boundary element flipping caused by the severe mutual extrusion of the internal elements near the boundary. Finally, typical examples are tested to verify the effectiveness of the proposed mesh parameterization method. (c) 2023 Elsevier Ltd. All rights reserved.

关键词： Negative Poisson's ratio mesh parameterization Free boundary mesh mapping Finite element method

来源：评论

学校读者我要写书评

暂无评论

MDSSN: An end-to-end deep network on triangle mesh parameterization

引用

KNOWLEDGE-BASED SYSTEMS 2024年 284卷

作者： Hu, Ruihan Tang, Zhi-Ri Yang, Rui Wang, Zhongjie Harbin Inst Technol Fac Comp Harbin Peoples R China City Univ Hong Kong Dept Comp Sci Hong Kong Peoples R China Guangdong Inst Intelligent Mfg Guangdong Key Lab Modern Control Technol Guangzhou Peoples R China

mesh data plays a crucial role in a wide range of applications worldwide within the field of 3D computer vision. In contrast to traditional Euclidean space arrangements, meshes encompass spatial information, including edges, faces, angles, and graph structures that embed face information within the mesh data. Nevertheless, conventional deep learning frameworks such as convolutional neural networks (CNNs) have struggled to achieve significant advancements in handling meshes. This paper proposes a simple mesh computation framework called mesh Decomposition Second-order Sobolev Network (MDSSN) to model triangle meshes and represent their shape. The construction of face-based Riemannian and edge-based Riemannian graphs is motivated by the remarkable representation capabilities of edges and faces in mesh data, achieved through a graph composition mechanism. Furthermore, we design end-to-end operators, including the Sobolev-filter block, pooling, and unpooling blocks, which draw inspiration from traditional deep learning frameworks for modeling the mesh structure. Importantly, the design of the mesh-filter block incorporates the second-order Sobolev metric. To address common challenges in mesh classification and segmentation tasks, we have designed dedicated classification and segmentation modules. We utilize a joint loss function that integrates losses from adjacent faces and categories. We evaluate the performance of the MDSSN in mesh classification and segmentation tasks, focusing on its ability to represent 3D shapes. Experimental results demonstrate that MDSSN achieves superior performance compared to other state-of-the-art approaches.

关键词： Graph composition Ssecond-order Sobolev End -to -end learning mesh parameterization

来源：评论

学校读者我要写书评

暂无评论

Joint optimization of distortion and cut location for mesh parameterization using an Ambrosio-Tortorelli functional

引用

COMPUTER AIDED GEOMETRIC DESIGN 2023年第1期105卷

作者： Weill-Duflos, Colin Coeurjolly, David de Goes, Fernando Lachaud, Jacques-Olivier Univ Grenoble Alpes Univ Savoie Mont Blanc CNRS LAMA F-73000 Chambery France Univ Lyon CNRS INSA Lyon UCBLLIRISUMR5205 Villeurbanne France Pixar Animat Studios Emeryville CA USA

UV mapping is a classical problem in computer graphics aiming at computing a planar parameterization of the input mesh with the lowest possible distortion while minimizing the seams length. Recent works propose optimization methods for solving these two joint problems at the same time with variational models, but they tend to be slower than other cutting methods. We present a new variational approach for this problem inspired by the Ambrosio-Tortorelli functional, which is easier to optimize than already existing methods. This functional has widely been used in image and geometry processing for anisotropic denoising and segmentation applications. The key feature of this functional is to model both regions where smoothing is applied, and the loci of discontinuities corresponding to the cuts. Our approach relies on this principle to model both the low distortion objective of the UV map, and the minimization of the seams length (sequences of mesh edges). Our method significantly reduces the distortion in a faster way than state-of-the art methods, with comparable seam quality. We also demonstrate the versatility of the approach when external constraints on the parameterization are provided (packing constraints, seam visibility). & COPY;2023 Elsevier B.V. All rights reserved.

关键词： mesh parameterization UV mapping Variational model Ambrosio-Tortorelli functional Joint distortion and cut

来源：评论

学校读者我要写书评

暂无评论

A Low Distortion mesh parameterization Mapping Method Based on Proxy Function and Combined Newton

引用

INTERNATIONAL JOURNAL OF PATTERN RECOGNITION AND ARTIFICIAL INTELLIGENCE 2022年第2期36卷

作者： Cai, Xingquan Feng, Dingwei Cai, Mohan Sun, Chen Sun, Haiyan North China Univ Technol Sch Informat Sci & Technol Beijing 100144 Peoples R China

To address the issues of low efficiencies and serious mapping distortions in current mesh parameterization methods, we present a low distortion mesh parameterization mapping method based on proxy function and combined Newton's method in this paper. First, the proposed method calculates visual blind areas and distortion prone areas of a 3D mesh model, and generates a model slit. Afterwards, the method performs the Tutte mapping on the cut three-dimensional mesh model, measures the mapping distortion of the model, and outputs a distortion metric function and distortion values. Finally, the method sets iteration parameters, establishes a reference mesh, and finds the optimal coordinate points to get a convergent mesh model. When calculating mapping distortions, Dirichlet energy function is used to measure the isometric mapping distortion, and MIPS energy function is used to measure the conformal mapping distortion. To find the minimum value of the mapping distortion metric function, we use an optimal solution method combining proxy functions and combined Newton's method. The experimental data show that the proposed method has high execution efficiency, fast descending speed of mapping distortion energy and stable optimal value convergence quality. When a texture mapping is performed, the texture is evenly colored, close laid and uniformly lined, which meets the standards in practical applications.

关键词： mesh parameterization mapping distortion distortion metric function optimal coordinate points

来源：评论

学校读者我要写书评

暂无评论

Sparse Cholesky Updates for Interactive mesh parameterization

引用

ACM TRANSACTIONS ON GRAPHICS 2020年第6期39卷 202-202页

作者： Herholz, Philipp Sorkine-Hornung, Olga Swiss Fed Inst Technol Zurich Switzerland

We present a novel linear solver for interactive parameterization tasks. Our method is based on the observation that quasi-conformal parameterizations of a triangle mesh are largely determined by boundary conditions. These boundary conditions are typically constructed interactively by users, who have to take several artistic and geometric constraints into account while introducing cuts on the geometry. Commonly, the main computational burden in these methods is solving a linear system every time new boundary conditions are imposed. The core of our solver is a novel approach to efficiently update the Cholesky factorization of the linear system to reflect new boundary conditions, thereby enabling a seamless and interactive workflow even for large meshes consisting of several millions of vertices.

关键词： mesh parameterization boundary conditions sparse matrix factorization

来源：评论

学校读者我要写书评

暂无评论

Conformal mesh parameterization using discrete Calabi flow

引用

COMPUTER AIDED GEOMETRIC DESIGN 2018年 63卷 96-108页

作者： Zhao, Hui Li, Xuan Ge, Huabin Lei, Na Zhang, Min Wang, Xiaoling Gu, Xianfeng [a]Tsinghua University China [b]Beijing Advanced Innovation Center for Imaging Technology Capital Normal University China [c]Department of Mathematics Beijing Jiaotong University China [d]DUT-RU International School of Information and Software Engineering Dalian University of Technology China [e]Computer Science Department State University of New York at Stony Brook USA [f]Brigham and Women's Hospital Harvard Medical School USA [g]Center of Mathematical Sciences and Applications Harvard University USA [h]Key Laboratory for Ubiquitous Network and Service Software of Liaoning Province China [i]School of Mechanical Engineering University of Science and Technology Beijing China

In this paper, we introduce discrete Calabi flow to the graphics research community and present a novel conformal mesh parameterization algorithm. Calabi energy has a succinct and explicit format. Its corresponding flow is conformal and convergent under certain conditions. Our method is based on the Calabi energy and Calabi flow with solid theoretical and mathematical base. We demonstrate our approach on dozens of models and compare it with other related flow based methods, such as the well-known Ricci flow and conformal equivalence of triangle meshes (CETM). Our experiments show that the performance of our algorithm is comparably the same with other methods. The discrete Calabi flow in our method provides another perspective on conformal flow and conformal parameterization. (C) 2018 Elsevier B.V. All rights reserved.

关键词： Calabi flow mesh parameterization Conformal mapping

来源：评论

学校读者我要写书评

暂无评论

Weighted area/angle distortion minimization for mesh parameterization

引用

ENGINEERING COMPUTATIONS 2017年第6期34卷 1874-1895页

作者： Mejia, Daniel Acosta, Diego A. Ruiz-Salguero, Oscar Univ EAFIT Lab CAD CAM CAE Medellin Colombia Univ EAFIT Grp Desarrollo & Diseno Proc Medellin Colombia

Purpose - mesh parameterization is central to reverse engineering, tool path planning, etc. This work synthesizes parameterizations with un-constrained borders, overall minimum angle plus area distortion. This study aims to present an assessment of the sensitivity of the minimized distortion with respect to weighed area and angle distortions. Design/methodology/approach - A mesh parameterization which does not constrain borders is implemented by performing: isometry maps for each triangle to the plane Z = 0;an affine transform within the plane Z = 0 to glue the triangles back together;and a Levenberg-Marquardt minimization algorithm of a nonlinear F penalty function that modifies the parameters of the first two transformations to discourage triangle flips, angle or area distortions. F is a convex weighed combination of area distortion (weight: a with 0 <= alpha <= 1) and angle distortion (weight: 1 - alpha). Findings - The present study parameterization algorithm has linear complexity [O(n), n = number of mesh vertices]. The sensitivity analysis permits a fine-tuning of the weight parameter which achieves overall bijective parameterizations in the studied cases. No theoretical guarantee is given in this manuscript for the bijectivity. This algorithm has equal or superior performance compared with the ABF, LSCM and ARAP algorithms for the Ball, Cow and Gargoyle data sets. Additional correct results of this algorithm alone are presented for the Foot, Fandisk and Sliced-Glove data sets. Originality/value - The devised free boundary nonlinear mesh parameterization method does not require a valid initial parameterization and produces locally bijective parameterizations in all of our tests. A formal sensitivity analysis shows that the resulting parameterization is more stable, i.e. the UV mapping changes very little when the algorithm tries to preserve angles than when it tries to preserve areas. The algorithm presented in this study belongs to the class that parameterize

关键词： Reverse engineering Sensitivity analysis Complexity analysis Levenberg-Marquardt mesh parameterization Nonlinear optimization

来源：评论

学校读者我要写书评

暂无评论

A General Framework for Constrained mesh parameterization 15

A General Framework for Constrained Mesh Parameterization

引用

31st Spring Conference on Computer Graphics

作者： Vaitkus, Marton Varady, Tamas Budapest Univ Technol & Econ Budapest Hungary

ISBN: (纸本)9781450336932

Parameterizing or flattening a triangle mesh is necessary for many applications in computer graphics and geometry. While mesh parameterization is a very popular research topic, the vast majority of the literature is focused on minimizing distortion or satisfying constraints related to certain applications such as texturing or quadrilateral remeshing. Certain downstream applications require adherence to more general, geometric constraints - possibly at the cost of higher distortion. These geometric constraints include requirements such as certain vertices lie on some line or circle, or a planar curve or developable region keeps its shape during parameterization. We present a framework for enforcing such constraints, motivated by the As-Rigid-As-Possible parameterization method, and demonstrate its effectiveness through several examples.

关键词： mesh parameterization geometric constraints vector field geometry processing

来源：评论

学校读者我要写书评

暂无评论

Combined parameterization of material distribution and surface mesh for stiffener layout optimization of complex surfaces

引用

STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION 2022年第3期65卷 103-103页

作者： Zhang, Weihong Feng, Shengqi Northwestern Polytech Univ State IJR Ctr Aerosp Design & Addit Mfg Xian 710072 Shaanxi Peoples R China

Stiffener layout optimization of complex surfaces is fulfilled within the framework of topology optimization. A combined parameterization method is developed in two aspects. One is to parameterize the material distribution of the stiffener layout by means of B-spline. The other is to build the mapping relationship from the known 3D surface mesh of the thin-walled structure to its parametric domain by means of mesh parameterization. The influence of mesh parameterization upon the stiffener layout is discussed to reveal the matching issue of the combined parameterization. 3D complex surfaces represented by the triangular mesh can be dealt with even though analytical parametric equations are not available. Some numerical examples are solved to demonstrate the direct advantage and effectiveness of the proposed method.

关键词： Combined parameterization B-spline mesh parameterization Complex surfaces Stiffener layout

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：