检索结果-内蒙古大学图书馆

26th pacific conference on computer graphics and applications, pacific graphics 2018

ISBN: (纸本)9783038680734

the proceedings contain 27 papers. the topics discussed include: StretchDenoise: parametric curve reconstruction with guarantees by separating connectivity from residual uncertainty of samples;robust and efficient SPH simulation for high-speed fluids with the dynamic particle partitioning method;bottom-up/top-down geometric object reconstruction with CNN classification for mobile education;effects of surface anisotropy on perception of car body attractiveness;efficient metropolis path sampling for material editing and re-rendering;mesh parameterization: a viewpoint from constant mean curvature surfaces;skeleton-based generalized cylinder deformation under the relative curvature condition;and anisotropic spectral manifold wavelet descriptor for deformable shape analysis and matching.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Curvature continuity conditions between adjacent toric surface patches

引用

computer graphics FORUM 2018年第7期37卷 469-477页

作者： Sun, Lanyin Zhu, Chungang Xinyang Normal Univ Sch Math & Stat Xinyang Peoples R China Dalian Univ Technol Sch Math Sci Dalian Peoples R China

Toric surface patch is the multi-sided generalization of classical Bezier surface patch. Geometric continuity of the parametric surface patches plays a crucial role in geometric modeling. In this paper, the necessary and sufficient conditions of curvature continuity between toric surface patches are illustrated with the theory of toric degeneration. Furthermore, some practical sufficient conditions of curvature continuity of toric surface patches are also developed.

关键词： CCS Concepts •Computing methodologies → Shape modeling • Applied computing → computer‐aided manufacturing • General and reference → Design

来源：评论

学校读者我要写书评

暂无评论

GPU-based Polynomial Finite Element Matrix Assembly for Simplex Meshes

引用

computer graphics FORUM 2018年第7期37卷 443-454页

作者： Mueller-Roemer, J. S. Stork, A. TU Darmstadt & Fraunhofer IGD Darmstadt Germany

In this paper, we present a matrix assembly technique for arbitrary polynomial order finite element simulations on simplex meshes for graphics processing units (GPU). Compared to the current state of the art in GPU-based matrix assembly, we avoid the need for an intermediate sparse matrix and perform assembly directly into the final, GPU-optimized data structure. thereby, we avoid the resulting 180% to 600% memory overhead, depending on polynomial order, and associated allocation time, while simplifying the assembly code and using a more compact mesh representation. We compare our method with existing algorithms and demonstrate significant speedups.

关键词： CCS Concepts •Computing methodologies → Massively parallel and high‐performance simulations Massively parallel algorithms Physical simulation graphics processors •Mathematics of computing → Combinatoric problems

来源：评论

学校读者我要写书评

暂无评论

Piecewise linear mapping optimization based on the complex view

引用

computer graphics FORUM 2018年第7期37卷 233-243页

作者： Golla, Bjoern Seidel, Hans-Peter Chen, Renjie Max Planck Inst Informat Saarbrucken Germany

We present an efficient modified Newton iteration for the optimization of nonlinear energies on triangle meshes. Noting that the linear mapping between any pair of triangles is a special case of harmonic mapping, we build upon the results of Chen and Weber [CW17]. Based on the complex view of the linear mapping, we show that the Hessian of the isometric energies has a simple and compact analytic expression. this allows us to analytically project the per-element Hessians to positive semidefinite matrices for efficient Newton iteration. We show that our method outperforms state-of-the-art methods on 2D deformation and parameterization. Further, we inspect the spectra of the per triangle energy Hessians and show that given an initial mapping, simple global scaling can shift the energy towards a more convex state. this allows Newton iteration to converge faster than starting from the given initial state. Additionally, our formulations support adding an energy smoothness term to the optimization with little additional effort, which improves the mapping results such that concentrated distortions are reduced.

关键词： CCS Concepts • theory of computation → Nonconvex optimization • Computing methodologies → computer graphics

来源：评论

学校读者我要写书评

暂无评论

Translucent Image Recoloring through Homography Estimation

引用

computer graphics FORUM 2018年第7期37卷 421-432页

作者： Huang, Yifei Wang, Changbo Li, Chenhui East China Normal Univ Sch Comp Sci & Software Engn Shanghai Peoples R China

Image color editing techniques are of great significance for users who wish to adjust the image color. However, previous works paid less attention to the translucent images. In this paper, we propose a new method to recolor the translucent images while preserving detailed information and color relationships of the source image. We consider the recolor problem as a location transformation problem and solve it in two steps: automatic palette extraction and homography estimation. First, we propose the Hmeans method to extract the dominant colors of the source image based on histogram statistics and clustering. then, we propose homography estimation to map the source colors to desired colors in the CIE-LAB color space. Further, we adopt a non-linear optimization approach to improve the result generated by the last step. the proposed method maintains high fidelity of the source image. Experiments have shown that our method generates a state-of-the-art visual result, in particular in the shadow areas. the source images with ground truth generated by a ray tracer further verify the effectiveness of our method.

关键词： CCS Concepts • computer graphics → Image Editing

来源：评论

学校读者我要写书评

暂无评论

Reformulating Hyperelastic Materials with Peridynamic Modeling

引用

computer graphics FORUM 2018年第7期37卷 121-130页

作者： Xu, Liyou He, Xiaowei Chen, Wei Li, Sheng Wang, Guoping Peking Univ Beijing Peoples R China ISCAS State Key Lab CS Beijing Peoples R China

Peridynamics is a formulation of the classical elastic theory that is targeted at simulating deformable objects with discontinuities, especially fractures. Till now, there are few studies that have been focused on how to model general hyperelastic materials with peridynamics. In this paper, we target at proposing a general strain energy function of hyperelastic materials for peridynamics. To get an intuitive model that can be easily controlled, we formulate the strain energy density function as a function parameterized by the dilatation and bond stretches, which can be decomposed into multiple one-dimensional functions independently. To account for nonlinear material behaviors, we also propose a set of nonlinear basis functions to help design a nonlinear strain energy function more easily. For an anisotropic material, we additionally introduce an anisotropic kernel to control the elastic behavior for each bond independently. Experiments show that our model is flexible enough to approximately regenerate various hyperelastic materials in classical elastic theory, including St. Venant-Kirchhoff and Neo-Hookean materials.

关键词： CCS Concepts •computer graphics → three‐Dimensional graphics‐Animation

来源：评论

学校读者我要写书评

暂无评论

Subdivision schemes with optimal bounded curvature near extraordinary vertices

引用

computer graphics FORUM 2018年第7期37卷 455-467页

作者： Ma, Yue Ma, Weiyin City Univ Hong Kong Dept Mech Engn Hong Kong Hong Kong Peoples R China

We present a novel method to construct subdivision stencils near extraordinary vertices with limit surfaces having optimal bounded curvature at extraordinary positions. With the proposed method, subdivision stencils for newly inserted and updated vertices near extraordinary vertices are first constructed to ensure subdivision with G1 continuity and bounded curvature at extraordinary positions. the remaining degrees of freedom of the constructed subdivision stencils are further used to optimize the eigenbasis functions corresponding to the subsubdominant eigenvalues of the subdivision with respect to G2 continuity constraints. We demonstrate the method by replacing subdivision stencils near extraordinary vertices for Catmull-Clark subdivision and compare the results with the original Catmull-Clark subdivision and previous tuning schemes known with small curvature variation near extraordinary positions. the results show that the proposed method produces subdivision schemes with better or comparable curvature behavior around extraordinary vertices with comparatively simple subdivision stencils.

关键词： CCS Concepts •Computing methodologies → Mesh geometry models Parametric curve and surface models •Applied computing → computer‐aided design

来源：评论

学校读者我要写书评

暂无评论

Deep Video Stabilization Using Adversarial Networks

引用

computer graphics FORUM 2018年第7期37卷 267-276页

作者： Xu, Sen-Zhe Hu, Jun Wang, Miao Mu, Tai-Jiang Hu, Shi-Min Tsinghua Univ Dept Comp Sci & Technol Beijing Peoples R China

Video stabilization is necessary for many hand-held shot videos. In the past decades, although various video stabilization methods were proposed based on the smoothing of 2D, 2.5D or 3D camera paths, hardly have there been any deep learning methods to solve this problem. Instead of explicitly estimating and smoothing the camera path, we present a novel online deep learning framework to learn the stabilization transformation for each unsteady frame, given historical steady frames. Our network is composed of a generative network with spatial transformer networks embedded in different layers, and generates a stable frame for the incoming unstable frame by computing an appropriate affine transformation. We also introduce an adversarial network to determine the stability of apiece of video. the network is trained directly using the pair of steady and unsteady videos. Experiments show that our method can produce similar results as traditional methods, moreover, it is capable of handling challenging unsteady video of low quality, where traditional methods fail, such as video with heavy noise or multiple exposures. Our method runs in real time, which is much faster than traditional methods.

关键词： CCS Concepts •Computing methodologies → computer graphics

来源：评论

学校读者我要写书评

暂无评论

Instant Stippling on 3D Scenes

引用

computer graphics FORUM 2018年第7期37卷 255-266页

作者： Ma, Lei Guo, Jianwei Yan, Dong-Ming Sun, Hanqiu Chen, Yanyun Chinese Acad Sci Inst Software State Key Lab Comp Sci Beijing Peoples R China Chinese Acad Sci Inst Automat NLPR Beijing Peoples R China Univ Chinese Acad Sci Beijing Peoples R China Chinese Univ Hong Kong Hong Kong Hong Kong Peoples R China

In this paper, we present a novel real-time approach to generate high-quality stippling on 3D scenes. the proposed method is built on a precomputed 2D sample sequence called incremental Voronoi set with blue-noise properties. A rejection sampling scheme is then applied to achieve tone reproduction, by thresholding the sample indices proportional to the inverse target tonal value to produce a suitable stipple density. Our approach is suitable for stippling large-scale or even dynamic scenes because the thresholding of individual stipples is trivially parallelizable. In addition, the static nature of the underlying sequence benefits the frame-to-frame coherence of the stippling. Finally, we propose an extension that supports stipples of varying sizes and tonal values, leading to smoother spatial and temporal transitions. Experimental results reveal that the temporal coherence and real-time performance of our approach are superior to those of previous approaches.

关键词： CCS Concepts •Computing methodologies → computer graphics Non‐photorealistic rendering Image processing Texturing Appearance and texture representations

来源：评论

学校读者我要写书评

暂无评论

Local and Hierarchical Refinement for Subdivision Gradient Meshes

引用

computer graphics FORUM 2018年第7期37卷 373-383页

作者： Verstraaten, T. W. Kosinka, J. Univ Groningen Bernoulli Inst Nijenborgh 9 NL-9747 AG Groningen Netherlands

Gradient mesh design tools allow users to create detailed scalable images, traditionally through the creation and manipulation of a (dense) mesh with regular rectangular topology. through recent advances it is now possible to allow gradient meshes to have arbitrary manifold topology, using a modified Catmull-Clark subdivision scheme to define the resultant geometry and colour [LKSD17]. We present two novel methods to allow local and hierarchical refinement of both colour and geometry for such subdivision gradient meshes. Our methods leverage the mesh properties that the particular subdivision scheme ensures. In both methods, the artists enjoy all the standard capabilities of manipulating the mesh and the associated colour gradients at the coarsest level as well as locally at refined levels. Further novel features include interpolation of both position and colour of the vertices of the input meshes, local detail follows coarser-level edits, and support for sharp colour transitions, all at any level in the hierarchy offered by subdivision.

关键词： CCS Concepts •Computing methodologies → graphics systems and interfaces Parametric curve and surface models

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：