针对自由曲线的多分辨率表示,选取了双参数Chaikin细分法,基于几何逆向思想提出了相应的逆细分算法,建立了双参数可控的自由曲线渐近分解规则,通过分析双参数对曲线分解的影响,寻找出最优分解参数值,实现了自由曲线的最优分解,通过渐近分解时建立的误差向量,最终实现了自由曲线的完全重建。该算法比以往方法构造过程简单,几何意义明显,易于推广到其他细分模式上。
In order to achieve multi-resolution representation of freedom curve, this paper gave the generalized reverse Chaikin subdivision based on the reverse geometry, then established decomposition rules based on two parameters, and proposed the opti- mal decomposition and reconstruction rules of freeform curves by analyzing the optimal parameters and establishing the error vec- tors. The algorithm is simpler in construction, more obvious in geometrical meaning and easier to spread to other subdivision scheme than previous related techniques.