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New Circular Nonlinear Subdivision Schemes for Curve Design

New Circular Nonlinear Subdivision Schemes for Curve Design,Jian-ao Lian,Yonghui Wang,Yonggao Yang

New Circular Nonlinear Subdivision Schemes for Curve Design  
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Two new families of nonlinear 3-point subdivision schemes for curve design are introduced. The first family is ternary interpolatory and the second family is binary approximation. All these new schemes are circular-invariant, meaning that new vertices are generated from local circles formed by three consecutive old vertices. As consequences of the nonlinear schemes, two new families of linear subdivision schemes for curve design are established. The 3-point linear binary schemes, which are corner-cutting depending on the choices of the tension parameter, are natural extensions of the Lane-Riesenfeld schemes. The four families of both nonlinear and linear subdivision schemes are implemented extensively by a variety of examples.
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