[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. "+KJop  
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Without sharpening ` b !5^W  
MTF@1/3 cycles/pixel >= 0.35 8$|8`;I(  
MTF@1/2 cycles/pixel >= 0.15 B)$c|dUV  
这种关于MTF的要求是什么含意? UE _fpq  
请高手指点!

MTF50是指传函降为峰值一半时对应的频率 Nd:R" p*8  
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 I3u{zHVwI  
LW/PH＝2 * lp/mm * (picture height in mm)，这种评价方法考虑了CCD的大小 SEQ%'E5-'  
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http://www.imatest.com/docs/sharpness.html，可以参考

多谢,大侠指点!