本文讨论了任意函数类的一条光滑平面参数曲线段，在适当的射影变换下，可以变为相应的有理形式的平面三阶参数曲线。
By using a certain projective transformation, a smooth planar parametric curve with any function may be changed into a new planar parametric curve of order 3 in a rational form.
同时提出了采用校正函数补偿衍射影响的方法。
At the same time, the method with corrective function is proposed to compensate the influence of diffraction.
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