[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. &bqT/H18  
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Without sharpening A`}yBSb  
MTF@1/3 cycles/pixel >= 0.35 Z34Wbun4  
MTF@1/2 cycles/pixel >= 0.15 M'`;{^<  
这种关于MTF的要求是什么含意? O9'x-A%  
请高手指点!

MTF50是指传函降为峰值一半时对应的频率 *xf._~E  
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 ~zm7?_"@]  
LW/PH＝2 * lp/mm * (picture height in mm)，这种评价方法考虑了CCD的大小 #X: 'aj98  
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http://www.imatest.com/docs/sharpness.html，可以参考

多谢,大侠指点!