讨论了n次区间Ball曲线的边界的构成;同时通过讨论区间多项式的降阶,利用线性规划法及最佳一致逼近法,给出了区间Ball曲线的的降阶算法.若利用线性规划法得到的区间曲线不能达到预期的误差,则可以结合细分的技术实现.
The boundary of interval Ball curves of degree n is discussed and two algorithms for the degree reduction of interval Ball curves are given by means of linear programming and best approximation respectively. If the interval curves obtained by linear programming method fall to be controlled within the expected error, then subdivision technique can be used.