[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. %4g4 C#  
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Without sharpening {>qrf:  
MTF@1/3 cycles/pixel >= 0.35 Q0cf]  
MTF@1/2 cycles/pixel >= 0.15 6Yi,%#  
这种关于MTF的要求是什么含意? sg~/RSJ3  
请高手指点!

MTF50是指传函降为峰值一半时对应的频率 ^,r;/c9A8  
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 YXOD fd%L  
LW/PH＝2 * lp/mm * (picture height in mm)，这种评价方法考虑了CCD的大小 B3=/iOb#  
lP &%5y;  
http://www.imatest.com/docs/sharpness.html，可以参考

多谢,大侠指点!