Modulation transfer function (MTF)

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Francesco on 22 May 2012
I'm going to evaluate the MTF of an imaging system. I have a MatLab code and it works fine and my question is not related with programming. I would like to know why spatial resolution is evaluated at the 50% of the MTF. In the web it is written that it is because it correlates well with our perception of sharpness, but other web site (wikipedia) says that is it raleted with the best focus position... Is there any good reference that explains properly this point? Thank you
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Francesco on 23 May 2012
I forgot to mention that sometimes it is evaluated at 30% of MTF... but I can not find any clue so far

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Answers (1)

Image Analyst
Image Analyst on 17 Jun 2012
I suggest you ask in the sci.optics or sci.image.processing newsgroup. My guess is that is just the convention, though some people have different conventions. Or do a search for "MTF cutoff frequency"

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