本文提出了一种改进的分段二次插值法描写光学系统的光瞳形状，得到了满意的效果，其坐标误差小于1%，面积误差约0.25%。
A modified segmental quadratic interpolation method which describes the shape of optical system pupil with relative coordinate error less than 1% and area error about 0.25%, is presented.
利用一系列适当形状的元素将计算区域离散，在元素内采用线性插值函数。
The computational domain is discretized by a series of elements with adaptable shape, linear inter-potation function is used in each element.
采用分段线性插值法，给出了由形状观测离散值反求密度分布的计算方法，并给出了算例。
A calculation strategy for the recovery of density distribution by the shape observations is presented and proved by piecewise linear interpolation method.
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