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The obverse projection method is limited because of protective glass and pixel of CMOS/CCD.
逆投影法颠倒镜头成像系统物和像的位置，克服了手机镜头后焦、像素等的限制。
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There are obverse and adverse projection two methods for measure modulation transfer function(MTF) of lens.
镜头调制传递函数（MTF）的测量有正投影和逆投影两种方法。
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