在边界提取时选取有一定间距的像素分别计算三原色梯度，把其中绝对值最大的梯度作为边界存在的判据之一，同时根据二阶导数符号变化提取边界。
Third, the gradient between two pixels that have certain distance was calculated in three color components respectively, and then the maximum of gradients of the three was attained.
束宽和远场发散角的相对误差随球差系数绝对值的增加和光束阶数的减小而增加；
The relative errors of the beam width and far-field divergence angle introduced by the spherical aberration increase with increasing spherical aberration coefficient and decreasing beam order.
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