倾斜放大率有助于光学成像系统的优化设计，并可以进行成像大小的精确计算。
The slantwise magnification can give a help to design of optimized optical image system easily and calculate the size of image accurately.
通过分析该模型中物与像的对应关系，得出了射影失真产生的根源是光学系统放大率的不恒定，并与相机的外参数：倾角及视场的大小有着非线性的变化关系。
The reason for Projective distortion that the amplification ratio is not constant but has nonlinear relation with pitch and tilt angles and field of view of cameras was found out.
需要一种可以改变放大率的小型快速光学变焦装置。
There is a need for a small and fast optical zoom device that can change magnification.
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