国家自然科学基金(60333010)

作品数：40被引量：174H指数：8
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Approximate merging of multiple Bézier segments被引量：10
《Progress in Natural Science:Materials International》2008年第6期757-762,共6页Min Cheng Guojin Wang 
the National Basic Research Program of China Grant No. 2004CB719400）;National Natural Science Foundation of China（Grant Nos.60673031 and 60333010）;the Scientific Research Program of the Education Office of Zhejiang Province（Grant No.20070309）.
This paper deals with the approximate merging problem of multiple adjacent Bézier curves with different degrees by a single Bézier curve, which is a frequently seen problem in modeling. The unified matrix representa...
关键词：Computer-aided geometric design Bézier curve Approximate merging Matrix representation 
A new method for designing a developable surface utilizing the surface pencil through a given curve被引量：8
《Progress in Natural Science:Materials International》2008年第1期105-110,共6页Hongyan Zhao Guojin Wang 
This work was supported by the National Basic Research Program of China(Grant No.2004CB719400);National Natural Science Foundation of China(Grant Nos.60673031,60333010,and 60021201).
This paper proposes a new method for designing a developable surface by constructing a surface pencil passing through a given curve, which is quite in accord with the practice in industry design and manufacture. By ut...
关键词：CAD/CAM Developable surface GEODESIC Frenet frame 
Hodograph computation and bound estimation for rational B-spline curves
《Progress in Natural Science:Materials International》2007年第8期988-992,共5页Xu Huixia Wang Guojin 
Supported by the National Program on Key Basic Research Projects (Grant No.2004CB719400);National Natural Science Foundation of China (Grant Nos.60673031,60333010)
It is necessary to compute the derivative and estimate the bound of rational B-spline curves in design system, which has not been studied to date. To improve the function of computer aided design （CAD） system, and t...
关键词：computer aided design （CAD） rational B-spline discrete B-spline hodograph bound of derivative distance between two points. 
Shape blending of artistic brushstroke represented by disk B-spline curves被引量：1
《Progress in Natural Science:Materials International》2007年第12期1501-1507,共7页Cheng Min Wang Guojin 
Supported by the National Programon Key Basic Research Projects (Grant No .2004CB719400);National Natural Science Foundation ofChina (Grant Nos .60673031 and 60333010)
This paper presents an algorithm for automatically generating in-between frames of two artistic brushstrokes. The basic idea of the algorithm is to represent the two key frames of artistic brushstrokes in disk B-splin...
关键词：computer aided calligraphy shape blending brushstroke disk B-spline curve skeleton. 
Copy-and-paste operation of planar polygonal shapes
《Progress in Natural Science:Materials International》2007年第7期859-866,共8页Yang Wenwu Feng Jieqing Huang Shengsheng Jin Xiaogang 
Supported jointly by National Natural Science Foundation of China(Grant Nos.60373036,60333010);the National Program on Key Basic Research Projects(Grant No.2002CB312101);Natural Science Foundation of Zhejiang Province(Grant No.R106449);the Doctoral Program of Higher Education(Specialized Research Fund)(Grant No.20050335069)
A 2D polygonal shape copy and-paste method is proposed which is based on a multiple planar shapes blending algorithm. First sub-shapes are specified and selected, which correspond to user-defined visual features on th...
关键词：copy-and-paste 2D shape blending metamorphosis. 
Improving reflectance estimation by BRDF-consistent region clustering被引量：3
《Progress in Natural Science:Materials International》2006年第3期313-320,共8页ZHANG Hongxin WU Xiangyang LIN Steve BAO Hujun 
Supported by National Natural Science Foundation of China (Key Program) (Grant No. 60333010)National Natural Science Foundation for Innovation Research Groups (Grant No. 60021201)the Major State Basic Research Development Program of China (Grant No. 2002CB312102)
Previous studies in reflectance estimation generally require prior segmentation of an image into regions of uniform reflectance. Due to the measurement noise and limited sampling of the BRDF （bi-directional reflectan...
关键词：TEXTURE SHADING grouping and segmentation reflectance estimation BRDF uncertainty 
Constrained Bézier curves' best multi-degree reduction in the L_2-norm被引量：20
《Progress in Natural Science:Materials International》2005年第9期843-850,共8页ZHANG Renjiang WANG Guojin 
SupportedbyNationalNaturalScienceFoundationofChina(GrantNos.60373033and60333010),theNationalNaturalScienceFoundationforInnovativeResearchGroups(GrantNo.60021201),andtheMajorStateBasicResearchDevelopmentProgramofChina(GrantNo.2004CB719400)
In computer aided geometric design, the degree reduction of the parameter curve is a key technique in data exchange and data compression. The various existing methods of degree reduction cannot decide whether the degr...
关键词：computer aided design Bézier curve  degree reduction  L2-norm  tolerance 
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