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• W2073302729 abstract "In this paper we describe the design of B-spline surface models by means of curves and tangency conditions. The intended application is the conceptual constraint-driven design of surfaces from hand-sketched curves. The solving of generalized curve surface constraints means to find the control points of the surface from one or several curves, incident on the surface, and possibly additional tangency and smoothness conditions. This is accomplished by solving large, and generally under-constrained, and badly conditioned linear systems of equations. For this class of linear systems, no unique solution exists and straight forward methods such as Gaussian elimination, QR-decomposition, or even blindly applied Singular Value Decomposition (SVD) will fail. We propose to use regularization approaches, based on the so-called L-curve. The L-curve, which can be seen as a numerical high frequency filter, helps to determine the regularization parameter such that a numerically stable solution is obtained. Additional smoothness conditions are defined for the surface to filter out aliasing artifacts, which are due to the discrete structure of the piece-wise polynomial structure of the B-spline surface. This leads to a constrained optimization problem, which is solved by Modified Truncated SVD: a L-curve based regularization algorithm which takes into account a user defined smoothing constraint." @default.
• W2073302729 created "2016-06-24" @default.
• W2073302729 creator A5090172866 @default.
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• W2073302729 date "2004-06-09" @default.
• W2073302729 modified "2023-10-02" @default.
• W2073302729 title "Constraint-based design of B-spline surfaces from curves" @default.
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• W2073302729 doi "https://doi.org/10.5555/1217875.1217908" @default.
• W2073302729 hasPublicationYear "2004" @default.
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