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Feature sensitive re-sampling of point set surfaces with Gaussian spheres

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Science China(Information Sciences) 2012年第9期55卷 2075-2089页

作者： BSCH Jonas pajarola renato GOPI M. Department of Informatics University of ZürichZürich CH-8050Switzerland Department of Computer Science University of CaliforniaIrvine CA 92697-3425USA

Feature sensitive simplification and re-sampling of point set surfaces is an important and challenging issue for many computer graphics and geometric modeling *** on the regular sampling of the Gaussian sphere and the surface normals mapping onto the Gaussian sphere,an adaptive re-sampling framework for point set surfaces is presented in this paper,which includes a naive sampling step by index propagation and a novel cluster optimization step by normalized *** proposed re-sampling scheme can generate non-uniformly distributed discrete sample points for the underlying point sets in a feature sensitive *** intrinsic geometric features of the underlying point set surfaces can be preserved efficiently due to our adaptive re-sampling scheme.A novel splat rendering technique is adopted to illustrate the efficiency of our re-sampling ***,a numerical error statistics and surface reconstruction for simplified models are also given to demonstrate the effectiveness of our algorithm in term of the simplified quality of the point set surfaces.

关键词： point set surfaces feature sensitive re-sampling Gaussian sphere simplification surface reconstruction

Symm Sketch: Creating symmetric 3D free-form shapes from 2D sketches

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Computational Visual Media 2015年第1期1卷 3-16页

作者： Yongwei Miao Feixia Hu Xudong Zhang Jiazhou Chen renato pajarola College of Computer Science and Technology Zhejiang University of Technology Department of Informatics University of Zürich

This paper presents Symm Sketch—a system for creating symmetric 3D free-form shapes from 2D sketches. The reconstruction task usually separates a 3D symmetric shape into two types of shape components, that is, the self-symmetric shape component and the mutual-symmetric shape components. Each type can be created in an intuitive manner. Using a uniform symmetry plane, the user first draws 2D sketch lines for each shape component on a sketching plane. The z-depth information of the hand-drawn input sketches can be calculated using their property of mirror symmetry to generate 3D construction curves. In order to provide more freedom for controlling the local geometric features of the reconstructed free-form shapes(e.g., non-circular crosssections), our modeling system creates each shape component from four construction curves. Using one pair of symmetric curves and one pair of general curves, an improved cross-sectional surface blending scheme is applied to generate a parametric surface for each component. The final symmetric free-form shape is progressively created, and is represented by 3D triangular mesh. Experimental results illustrate that our system can generate complex symmetric free-form shapes effectively and conveniently.

关键词： 3D reconstruction construction curves free-form shapes mirror symmetry sketch-based modeling

Relief generation from 3D scenes guided by geometric texture richness

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Computational Visual Media 2018年第3期4卷 209-221页

作者： Yongwei Miao Yuliang Sun Xudong Fang Jiazhou Chen Xudong Zhang renato pajarola College of Information Science and Technology Zhejiang Sci-Tech University College of Computer Science and Technology Zhejiang University of Technology Department of Informatics University of Zrich

Typically,relief generation from an input 3D scene is limited to either bas-relief or high-relief *** paper presents a novel unified scheme for synthesizing reliefs guided by the geometric texture richness of 3D scenes;it can generate both basand *** type of relief and compression coefficient can be specified according to the user’s artistic *** use an energy minimization function to obtain the surface reliefs,which contains a geometry preservation term and an edge constraint *** edge relief measure determined by geometric texture richness and edge z-depth is utilized to achieve a balance between these two *** relief generation,the geometry preservation term keeps local surface detail in the original scenes,while the edge constraint term maintains regions of the original models with rich geometric ***,in highreliefs,the edge constraint term also preserves depth discontinuities in the higher parts of the original *** energy function can be discretized to obtain a sparse linear *** reliefs are obtained by solving it by an iterative ***,we apply non-linear compression to the relief to meet the user’s artistic *** results show the method’s effectiveness for generating both bas-and high-reliefs for complex 3D scenes in a unified manner.

关键词：浮雕能量函数几何纹理计算机技术

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基于单幅RGB-D扫描数据的室内场景解析

计算机辅助设计与图形学学报 2018年第6期30卷 1046-1054页

作者：孙瑜亮缪永伟于莉洁 renato pajarola 浙江工业大学计算机科学与技术学院杭州310023 浙江理工大学信息学院杭州310018 瑞士苏黎世大学信息学院

随着消费级RGB-D设备的普遍使用,室内场景三维扫描数据更易获取,但通过此类低分辨率设备获取的点云数据通常带有噪声且缺失严重.为此,基于单幅RGB-D扫描点云数据,提出一种室内场景基元提取与自动分割方法.首先对RGB-D扫描数据进行预处理... 详细信息

随着消费级RGB-D设备的普遍使用,室内场景三维扫描数据更易获取,但通过此类低分辨率设备获取的点云数据通常带有噪声且缺失严重.为此,基于单幅RGB-D扫描点云数据,提出一种室内场景基元提取与自动分割方法.首先对RGB-D扫描数据进行预处理,自动检测场景中的墙面、天花板、地板等结构,并对点云进行降采样和离群点滤波处理;然后利用几何基元对剩余点云进行抽象,通过几何基元的组合来鲁棒地表示室内物体和部件,有效地减少大规模扫描数据处理的计算量;最后根据每个基元的几何和颜色特征描述符以及基元之间的几何关系,采用基于图的分割算法对基元进行组合实现室内场景物体的自动分割和提取.实验结果表明,该方法可以有效、鲁棒地抽象并分割杂乱的室内场景.

关键词：场景建模室内场景基元提取场景分割 RGB-D扫描数据