秦开怀
1.数字几何处理(小波变换及多分辨率几何造型);2.真实感图形实时绘制、动画与虚拟现实;3.组合显示/多投影组合显示墙;4.计算机视觉、图像处理与可视化;5.计算机网络图形及其并行计算技术;6.CAD/CAM等。
个性化签名
- 姓名:秦开怀
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
计算机科学技术
- 研究兴趣:1.数字几何处理(小波变换及多分辨率几何造型);2.真实感图形实时绘制、动画与虚拟现实;3.组合显示/多投影组合显示墙;4.计算机视觉、图像处理与可视化;5.计算机网络图形及其并行计算技术;6.CAD/CAM等。
秦开怀,清华大学 计算机科学与技术系 高性能计算研究所 教授,博士生导师;沈阳航空工业学院兼职教授。1990年获工学博士学位。1999.9~2000.8年于美国哈佛大学(Surgical Planning Lab., BWH,Harvard Medical School, Harvard University)作访问研究;1996~1997、1998.11~1998.12、1999.6~1999.9、 2001.9~2001.10、2003.7~2003.9、2005.8~2005.9、2007.1~2007.2等,多次到香港大学计算机科学系和香港中文大学计算机科学与工程系作访问研究。作为项目负责人已完成和在研的国家自然科学基金项目6项、北京市自然科学基金项目1项、教育部博士点基金项目2项、国家863计划项目2项,还负责和参加了曹光彪研究基金项目、国家863计划项目、企业横向合作和国家科技攻关项目等若干项。40多篇论文被SCI和EI收录和引用。
奖励
曾获“清华大学优秀博士后”奖、清华大学科技成果推广应用效益显著奖;两次获得省部级科技进步二等奖。多次获湖北省科协优秀论文一、二等奖和北京计算机学会青年优秀论文一等奖,一篇论文曾在德国Darmstadt被评为国际计算机图形学6篇优秀论文之一(one of the best six papers of the International Computer Graphics,全亚洲1名);曾有一项NSFC项目被国家自然科学基金委员会信息学部评议为“特优”。
其它学术活动
1. 应邀在Medical Imaging and Augmented Reality’2001 (MIAR’2001, Hong Kong)国际会议上作特邀报告;
2. 担任 IASTED 国际会议Computer Graphics Imaging’2000分会主席;
3. 担任国际会议Pacific Graphics ’98分会主席;
4. 多次担任 Pacific Graphics、Geometric Modeling & Processing、Computer Graphics Imaging、CAD/CG等国际会议的程序委员会委员;
5. 经常为《Computers & Graphics》、《The Visual Computer》、《中国科学》(中英文版)、《计算机学报》、《软件学报》、《Journal of Computer Science & Technology》、《计算机辅助设计与图形学学报》、《自然科学进展》(中英文版)、《中国图象图形学报》和《计算机研究与发展》等学术刊物以及Pacific Graphics、Computer Graphics International、Computer Graphics Imaging、CAD/CG等国际会议审稿;
6. 经常作为同行评议专家评审国家自然科学基金项目、教育部博士点基金项目、浙江省自然科学基金项目等等。
研究方向
1. 数字几何处理(小波变换及多分辨率几何造型);
2. 真实感图形实时绘制、动画与虚拟现实;
3. 组合显示/多投影组合显示墙;
4. 计算机视觉、图像处理与可视化;
5. 计算机网络图形及其并行计算技术;
6. CAD/CAM等。
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主页访问
1394
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0
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成果阅读
669
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成果数
11
【期刊论文】Biorthogonal wavelets based on gradual subdivision of quadrilateral meshes
秦开怀, Huawei Wang a, Kai Tang a, ∗, Kaihuai Qin b, c
Computer Aided Geometric Design 25(2008)816-836,-0001,():
-1年11月30日
This paper introduces a new biorthogonal wavelet based on a variant of √2 subdivision by using the lifting scheme. The greatest advantage of this wavelet is its very slow gradual refinement for quadrilateral meshes, which offers the biggest number of resolution levels to control a quadrilateral mesh. Moreover, the resulting wavelet transforms have a linear computational complexity, as they are composed of local and in-place lifting operations only. Feature lines can also be effectively integrated into the wavelet transforms as self-governed boundary curves. The introduced wavelet analysis can be used in a variety of applications such as progressive transmission, data compression, shape approximation and multiresolution rendering. The experiments have shown sufficient stability as well as better performance of the introduced wavelet analysis, as compared to the existing wavelet analyses for quadrilateral meshes of arbitrary topology.
Biorthogonal wavelet, √2 subdivision, Lifting scheme, Subdivision-based wavelet
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引用
【期刊论文】√3-Subdivision-Based Biorthogonal Wavelets
秦开怀, Huawei Wang, Kaihuai Qin, and Hanqiu Sun
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS, VOL. 13, NO.5, SEPTEMBER/OCTOBER 2007,-0001,():
-1年11月30日
A new efficient biorthogonal wavelet analysis based on the √3 subdivision is proposed in the paper by using the lifting scheme. Since the √3 subdivision is of the slowest topological refinement among the traditional triangular subdivisions, the multiresolution analysis based on the √3 subdivision is more balanced than the existing wavelet analyses on triangular meshes and accordingly offers more levels of detail for processing polygonal models. In order to optimize the multiresolution analysis, the new wavelets, no matter whether they are interior or on boundaries, are orthogonalized with the local scaling functions based on a discrete inner product with subdivision masks. Because the wavelet analysis and synthesis algorithms are actually composed of a series of local lifting operations, they can be performed in linear time. The experiments demonstrate the efficiency and stability of the wavelet analysis for both closed and open triangular meshes with √3 subdivision connectivity. The √3-subdivision-based biorthogonal wavelets can be used in many applications such as progressive transmission, shape approximation, and multiresolution editing and rendering of 3D geometric models.
√3subdivision,, biorthogonal wavelet,, lifting scheme.,
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61浏览
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【期刊论文】Efficient wavelet construction with Catmull–Clark subdivision
秦开怀, HuaweiWang, Kaihuai Qin, Kai Tang
Visual Comput (2006)22: 874-884,-0001,():
-1年11月30日
This paper presents an efficient biorthogonal wavelet construction with the generalized Catmull-Clark subdivision based on the lifting scheme. The subdivision wavelet construction scheme is applicable to all variants of Catmull-Clark subdivision, so it is more universal than the previous wavelet construction for the generalized bicubic B-spline subdivision. Because the analysis and synthesis algorithms of the wavelets are composed of a series of local and in-place lifting operations, they can be performed in linear time. The experiments have demonstrated the stability of the proposed wavelet analysis based on the ordinary Catmull-Clark subdivision. Moreover, the resulting Catmull-Clark subdivision wavelets have better fitting quality than the generalized bicubic B-spline subdivision wavelets at a similar computation cost.
Biorthogonal wavelet • Catmull-Clark subdivision • Lifting scheme
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38浏览
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【期刊论文】Curve modeling with constrained B-spline wavelets
秦开怀, Denggao Li a, ∗, Kaihuai Qin a, Hanqiu Sun b
Computer Aided Geometric Design 22(2005)45-56,-0001,():
-1年11月30日
In this paper we present a novel approach to construct B-spline wavelets under constraints, taking advantage of the lifting scheme. Constrained B-spline wavelets allowmultiresolution analysis of B-splines which fixes positions, tangents and/or high order derivatives at some user specified parameter values, thus extend the ability of B-spline wavelets: smoothing a curve while preserving user specified "feature points"; representing several segments of a single curve at different resolution levels, leaving no awkward "gaps"; multiresolution editing of B-spline curves under constraints. For a given B-spline order and the number of constraints, both the time and storage complexities of our algorithm are linear in the number of control points. This feature makes our algorithm extremely suitable for large scale datasets.
B-spline wavelets, Constraints, Lifting scheme
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31浏览
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128下载
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【期刊论文】Surface modeling with ternary interpolating subdivision
秦开怀, HuaweiWang, Kaihuai Qin
The Visual Computer (2005)21: 59-70,-0001,():
-1年11月30日
In this paper, a new interpolatory subdivision scheme, called ternary interpolating subdivision, for quadrilateral meshes with arbitrary topology is presented. It can be used to deal with not only extraordinary faces but also extraordinary vertices in polyhedral meshes of arbitrary topologies. It is shown that the ternary interpolating subdivision can generate a C1-continuous interpolatory surface. Some applications with open boundaries and curves to be interpolated are also discussed.
Interpolation-subdivision surface-quadrilateralmesh
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40浏览
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【期刊论文】Estimating Recursion Depth for Loop Subdivision
秦开怀, Huawei Wang*, Hanqiu Sun, Kaihuai Qin
,-0001,():
-1年11月30日
In this paper, an exponential bound of the distance between a Loop subdivision surface and its control mesh is derived based on the topological structure of the control mesh. The exponential bound is independent of the process of recursive subdivisions and can be evaluated without subdividing the control mesh actually. Using the exponential bound, we can predict the depth of recursion within a user-specified tolerance as well as the error bound after n steps of subdivision. The error-estimating approach can be used in many engineering applications such as surface/surface intersection, mesh generation, NC machining, surface rendering and the like.
Loop surface,, subdivision,, recursion depth,, arbitrary topology,, bound
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61浏览
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【期刊论文】Physics-Based Loop Surface Modeling
秦开怀, QIN Kaihuai, CHANG Zhengyi, WANG Huawei and LI Denggao
J. Comput. Sci. & Technol. Vol.17 No.6 Nov. 2002,-0001,():
-1年11月30日
Strongly inspired by the research on physics-based dynamic models for surfaces, we propose a new method for precisely evaluating the dynamic parameters (mass, damping and stiness matrices, and dynamic forces) for Loop surfaces without recursive subdivision regardless of regular or irregular faces. It is shown that the thin-plate-energy of Loop surfaces can be evaluated precisely and eÆciently, even though there are extraordinary points in the initial meshes, unlike the previous dynamic Loop surface scheme. Hence, the new method presented for Loop surfaces is much more eÆcient than the previous schemes.
subdivision,, Loop surface,, physics-based modeling
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28浏览
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【期刊论文】Existence and computation of spherical rational quartic curves for Hermite interpolation
秦开怀, WenpingWang, Kaihuai Qin
The Visual Computer (2000)16: 187-196,-0001,():
-1年11月30日
We study the existence and computation of spherical rational quartic curves that interpolate Hermite data on a sphere, i.e. two distinct endpoints and tangent vectors at the two points. It is shown that spherical rational quartic curves interpolating such data always exist, and that the family of these curves has n degrees of freedom for any given Hermite data on Sn, n ≥2. A method is presented for generating all spherical rational quartic curves on Sn interpolating given Hermite data.
Spherical rational guartic curves-Hermite interpolation-Stereographic projection
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49浏览
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【期刊论文】General matrix representations for Bsplines
秦开怀, Kaihuai Qin
The Visual Computer (2000)16: 177-186,-0001,():
-1年11月30日
In this paper, the concept of the basis matrix of B-splines is presented. A general matrix representation, which results in an explicitly recursive matrix formula, for nonuniform Bspline curves of an arbitrary degree is also presented by means of the Toeplitz matrix. New recursive matrix representations for uniform B-spline curves and Bézier curves of an arbitrary degree are obtained as special cases of that for nonuniformB-spline curves. The recursive formula for the basis matrix can be substituted for de Boor-Cox’s formula for B-splines, and it has a better time complexity than de Boor-Cox’s formula when used for computation and conversion of Bspline curves and surfaces between different CAD systems. Finally, some applications of the matrix representations are given in the paper.
B-splines-Matrix representations-Toeplitz matrix
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213浏览
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【期刊论文】Continuity of non-uniform recursive subdivision surfaces
秦开怀, QIN Kaihuai & WANG Huawei
SCIENCE IN CHINA (Series E), 2000, Vol. 43 No.5,-0001,():
-1年11月30日
Since Doo-Sabin and CatmulI-Clark surfaces were proposed in 1978, eigenstructure, con-vergense and continuity analyses of stationary subdivision have been performed very well, but it has been very difficult to prove the convergence and continuity of non-uniform recursive subdivision surfaces (NURSSes, for short) of arbitrary topology. In fact, so far a problem whether or not there exists the limit surface as well as G1 continuity of a non-uniform Catmull-Clark subdivision has not been solved yet. Here the concept of equivalent knot spacing is introduced. A new technique for eigenanalysis, convergence and continuity analyses of non-uniform CatmulI-Clark surfaces is proposed such that the convergence and G1 continuity of NURSSes at extraordinary points are proved. In addition, slightly improved rules for NURSSes are developed. This offers us one more alternative for modeling free-form surfaces of arbitrary topologies with geometric features such as cusps, sharp edges, creases and darts, while elsewhere maintaining the same order of continuity as B-spline surfaces.
Catmull-Clark,, non-uniform recursive subdivision surface,, convergence,, continuity.,
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54浏览
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