[求助]求助关于MTF [复制链接]

When sharpening algorithm is on and in normal operation mode, both horizontal and vertical MTF50 LW/PH >=800, or MTF50 >=0.3333 cycles/pixel. &{(8EvuDd  
rBovC  
Without sharpening O!.mc=Gx7  
MTF@1/3 cycles/pixel >= 0.35 >W?7a:#,  
MTF@1/2 cycles/pixel >= 0.15 3-$w5O
3}  
这种关于MTF的要求是什么含意? aIABx!83>  
请高手指点!

MTF50是指传函降为峰值一半时对应的频率 hV4\#K[  
cycles/pixel是多少算一下就知道了，cycles和lp等价，1/2 cycles/pixel 就是Nyquist频率 ljo^ 2  
LW/PH＝2 * lp/mm * (picture height in mm)，这种评价方法考虑了CCD的大小 Obm@2;^g6  
UCP4w@C  
http://www.imatest.com/docs/sharpness.html，可以参考

多谢,大侠指点!