对光学系统输出刀口像的一阶导数做傅里叶变换，可以得到该系统的光学传递函数（OTF）。

The OTF (Optical Transfer Function) of an optical system can be evaluated by the Fourier Transform of the first derivative of the optical image of an knife-edge (object).

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在传递函数模型中，这些方程经过（拉氏）变换，并消去中间变量，以求得所选定的输入输出变量间的关系。

In transfer function models these equations are transformed and variables are eliminated between them to find the relation between selected input and output variables.

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然后，利用多维拉普拉斯变换，推导出双线性系统非线性传递函数矩阵的计算公式。

Then by using multi-dimension Laplace transform, the computation formula of nonlinear transfer function matrices for MIMO bilinear system are deduced.

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