本文以具体镜头为例,探讨了确定光瞳形状的方法,着重论述了近年来流行的三次样条插值在某些情况下存在多余拐点的现象及其原因,最后提供了两种计算方案。 In this paper, taking a concrete lens as an example, the method of determining the pupil shape is discussed. The phenomenon of the inflexion point of the popular cubic spline interpolation in some cases and its reason are discussed emphatically. Finally, two calculation schemes are provided.