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中文摘要：
等距曲线逼近的关键在于对其参数速度的逼近，给出了Said—Bezier曲线参数速度的Tchebyshev逼近和Tchebyshev—Pad6逼近，在此基础上得到了Said—B6zier曲线的等距曲线的2种有理逼近函数．因为n次Said—B6zier曲线在参数K=En／2]时，即为n次Bezier曲线，所以文中方法同样适用于B6zier曲线的等距曲线逼近．最后通过2个实例验证了这2种逼近方法，并与Legendre逼近方法进行了比较．
英文摘要：
Parametric speed approximation is crucial to the approximation of offset curves. Both the Tchehyshev approximation and the Tchebyshev-Pade approximation of parametric speed of Said-Bezier curves are presented and two rational approximation functions of the offset curves of Said-Bezier curves are also obtained. Since Said-Bezier curve of degree n reduces to Bezier curve of degree n in the case of K=[n/2], the proposed methods are also applicable to Bezier curves. Two examples are given to show the effectiveness of these two methods,and the results are compared with Legendre approximation.
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