张彩明
CAGD、计算机图形学和图像处理
个性化签名
- 姓名:张彩明
- 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:
计算机软件
- 研究兴趣:CAGD、计算机图形学和图像处理
张彩明:工学博士,山东大学计算机科学与技术学院教授,博士生导师,计算机应用技术研究所所长。长期从事计算机辅助几何设计(CAGD),计算机图形学(CG)、科学计算可视化、医学图像处理等方面的理论研究与系统开发工作,在国内外有影响的杂志中国科学,Computer-Aided Design, Computer Aided Geometric Design和计算机学报等以及学术会议上发表相关论文近70余篇,其中SCI文章14篇,EI文章20篇。多次主持和参加国家自然科学基金、省部级科技项目,其研究成果,获教育部国家自然科学进步二等奖一次、三等奖一次,山东省科技进步二等奖三次、三等奖一次。出版学术专著一部;
1991年至1995年在日本东京工业大学作学术访问和攻读博士学位,研究领域是CAGD、计算机图形学和图像处理。1997年至1999年在美国Kentucky大学做学术访问和博士后研究工作,研究关于带约束的外形设计和修改、曲面的光顺等问题。理论研究成果:1)提出了曲线曲面光顺新理论和算法,实现了高光线的非线性问题分解为线性问题处理,解决了高光线模型应用的一个难点问题;2)对带约束的曲线/曲面设计,提出了对NURBS曲面做整体或局部放缩变换时曲面的某些重要特征保持不变的新技术;3)提出了构造可调整曲线曲面的新方法;4)提出了多项式精度的数据点参数化的新理论和算法。
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551
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成果数
10
张彩明, **, 纪秀花, 杨兴强
中国科学E辑信息科学 2004,34(12):1393~1403,-0001,():
-1年11月30日
提出了构造三角曲面片的一个新方法。新方法通过基本逼近算子加上附加插值算子构造满足给定边界曲线和跨界切矢的三角曲面片。基本逼近算子由逼近插值条件的5次多项式构成,附加插值算子用边点法产生。基本逼近算子和附加插值算子在构成三角曲面片中具有不同的作用,前者使三角曲面片以五次多项式精度逼近插值条件,而后者则使三角曲面片满足给定的插值条件。所构造的三角曲面片可以重构五次多项式曲面。给出了新方法和其他两种方法进行比较的结果。
三角曲面片,, 插值,, 五次多项式,, 布尔和,, 边点算子
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50浏览
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引用
张彩明, .), 何军), 张锐)
计算机辅助设计与图形学学报,2004,16(10):1392~1395,-0001,():
-1年11月30日
将扰动约束技应用于Bézier曲线的隆阶给出了理想的结果。讨论了将这类方法应用于B样曲线降价时结果不理想的原因,提出了采用最佳平方带近技术对B样条曲线做隆价运逄的方法;并用实例对该方法和基于扰动约束的隆价方法进了比较。
B样条曲线, 降价, 最佳平方逼近
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张彩明
,-0001,():
-1年11月30日
构造参数样条曲线的关键是选取节点。本文讨论了GC2三次参数样条曲线需满足的连续性方程,提出了构造GC2三次参数样条曲线的新方法。在讨论了平面有序五点确定一组三次多项式函数曲线、平面有序六点唯一确定一条三次多项式函数曲线的基础上,提出了计算相邻两区间上的节点的算法。构造的插值曲线具有三次多项式函数精度。本文还以实例对新方法与其它方法构造的插值曲线的精度进行了比较。
三次多项式,, 插值,, 参数化,, 参数样条曲线
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【期刊论文】Triangular patch modeling using combination method
张彩明, Caiming Zhang*, , Fuhua (Frank) Cheng
Computer Aided Geometric Design 19(2002)645-662,-0001,():
-1年11月30日
A new method for constructing triangular patches is presented. A triangular patch that interpolates given boundary curves and cross-boundary slopes is formed by blending three traditional side-vertex interpolation operators (Nielson, 1979) with a new, interior interpolation operator. The new operator is the solution of an interpolation process that interpolates both the interior and the boundary of the triangular domain. The interior interpolation operator has better approximation precision on the interior of the triangle than the side-vertex operators. The constructed triangular patch reproduces polynomial surfaces of degree four. Comparison results of the new method with the side-vertex method (Nielson, 1979) are included.
Triangular patch, Interpolation, Quartic polynomial, Combination method, Interior interpolation operator, Side-vertex interpolation operator
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【期刊论文】Knot Choosing by Accommodating the First Derivative Constraint
张彩明, Zhang Caiming*, Fuhua (Frank) Cheng†|
,-0001,():
-1年11月30日
The current cubic spline curve interpolation scheme is derived based on the implicit assumption that the magnitude of the first derivative of the curve is close to a constant. However, the assumption is not realized by the interpolation scheme. A knot choosing technique for parametric cubic spline interpolating curve construction that accommodates this assumption is presented. A comparison of the new method with several existing methods is performed and test results are included.
Spline curves,, strain energy,, smoothness,, shape preserving,, knots,, interpolation
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【期刊论文】Fairing spline curves and suracs by minimizing energy☆
张彩明, Caiming Zhang, Pifu Zhang, Fuhua (Frank) Cheng*
Computer-Aided Design 33(2001)913-923,-0001,():
-1年11月30日
New algorithms for the classical problem of fairing cubic spline curves ans bicubic spline surfaces are presented. To fair a cubic spline curve or a bicubic spline surface with abonormal portions, the algorithms (automatically or interactively) identify the 'bad' data points and replace them with new pointsproduced by minimizing the strain energy of the new cureve or suface. The proposed algorithms are more general than the existing algorithms in that the new algorithms can adjust more than one'bad' data point in each modification step and they include the existing algorithms in that the new algorithms can adjust more than one 'bad' data point in each modification step and they include the existing algorithms [Computer-Aided Design 15 (5) (1983) 288-293; 28 (1996) 59-66] as special cases. Test results ofthe new algorithms are included.
Splines curves/, surfaces, Curve/, surface fairing, Interploation, Smoothness, Strain energy
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27浏览
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【期刊论文】Constrained scaling of trimmed NURBS surfaces based on fix-and-stretch approach
张彩明, C. Zhang, P. Zhang, F. Cheng*
Computer-Aided Design 33(2001)103-112,-0001,():
-1年11月30日
A new method to scale a trimmed NURBS surface while holding the shape and size of specific features (trimming curves) unchanged is presented. The new method is fix-and-stretch based: the new surface is formed by fixing selected regions of the given trimmed NURBS surface that contain the trimming curves and stretching the remaining part of the surface to reach certain boundary conditions. The stretching process is performed using an optimization process to ensure that the resulting surface reflects the shape and curvature distribution of the scaled version of the given surface. The resulting surface maintains a NURBS representation and, hence, is compatible with most of the current data-exchange standards. The new approach is more robust than a previous, attach-and-deform based approach (Zhang P, Zhang C, Cheng F. Constrained shape scaling of trimmed NURBS surfaces. In: Proceedings of the 1999 ASME Design Theory and Methodology Conference. Las Vegas, Nevada, 1999) in that it can tolerate scaling factors of bigger values (up to 2 in some cases). The new approach also guarantees that the features remain exactly the same after scaling. Test results on several car parts with trimming curves and comparison with the previous approach are included. The quality of the resulting surfaces is examined using the highlight line model. The presented technique is important for integrating standard parts into a sculptured product.
Constrained scaling, Subdivision, Constrained deformation, Optimization, Highlight lines, Constrained stretching, Trimming curves, NURBS surfaces, Strain energy
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张彩明, 汪嘉业
中国种学(E辑),2003,33(2):116~126,-0001,():
-1年11月30日
讨论了构造C2连续的四次样条插值曲面问题。把四次样条函数降为C2连续可提供额外的自由度,用于提高曲面的插值精度和控制曲面的形状。给出了一个确定自由度的方法和C2连续的四次样条曲线需满足的连续性方程,提出了构造C2连续的四次样条插值曲面的新方法。新方法的特点是曲面需满足的连续性方程是三对角占优势的,曲面的不连续点在给定的数据点处。所构造的曲面具有四次多项式插值精度。最后以实例对新方法和现有三、四次样条函数方法的插值精度做了比较。
计算机辅助几保设计,, 曲线曲面,, 四次样条插值
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【期刊论文】Approaches for Constrained Parametric Curve Interpolation
张彩明, ZHANG CaiMing, YANG XingQing and WANG JiaYe
Sept. 2003, Vol. 18, no.5, pp. 592-597,-0001,():
-1年11月30日
The construction of a GC1 cubicinterpolatiing curve that lies on the same side of a given straight line as the data points is studied. The main task is to choose appropriate approaches to modify tangent vectors at the data points for the desired curve. Three types of approches for changing the magnitudes of the tangent vectors are presented.The first-type approach modifies the tanggent vectors by applying a constraint to the curve segment. The second one does thework by optimization techniques. The thired one is a modification of the existing method. Three critera are prsented to compare the three types of approaches with the existing method. the experiments that test the effectiveess of the approaches are included.
computer aided geometric design,, constrained interpolation,, polynomial curve,, straight line constraint
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