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Re: mtf and perceived sharpness
| Marc Wossner | 30 Jan 2007 09:38 |
> <otisbr...@pa.net> wrote
>
[quoted text clipped - 5 lines]
>
> -MT
Well, my question regards how mtf value and perceived sharpness are
related to each other and I´m convinced that this *has* to do with the
science of visual perception.
Marc
|
| Mike Tyner | 30 Jan 2007 03:56 |
> This is a detail of technical analylsis -- and
> NOT a medical subject.
Yes.. like logic and statistics, there's no room for it in your newsgroup.
Lessee... MTF(v) = Mi / M0 ---- Nope, no sci or med or vision anywhere in
that.
-MT
|
| otisbrown@pa.net | 30 Jan 2007 03:32 |
Some people are a dense as a stone.
M.T.F. is a technical term -- used to qualify
photographs and imagining analysis.
It is not a medical term.
Tragically Allen Leiberman has not a clue
about any of this.
This is a detail of technical analylsis -- and
NOT a medical subject.
Otis
> "otisbr...@pa.net" <otisbr...@pa.net> wrote innews:1170082986.136025.257750@a75g2000cwd.googlegroups.com:
>
[quoted text clipped - 4 lines]
>
> Allen |
| A Lieberma | 30 Jan 2007 02:19 |
> Clarification for the reader:
Clarification for the reader. Please disregard Otis's postings. He is not
in the medical profession and not in any position to give medical advice.
Thanks!
Allen
|
| otisbrown@pa.net | 29 Jan 2007 15:03 |
Clarification for the reader:
M.T.F = Modulation Transfer Function.
Otis
> Hi, I´m a bit confused about mtf curves and perceived sharpness
> because I found seemingly contradicting statements. Some texts say
[quoted text clipped - 7 lines]
> Thanks for your input!
> Marc |
| Marc Wossner | 29 Jan 2007 13:47 |
Hi, I´m a bit confused about mtf curves and perceived sharpness
because I found seemingly contradicting statements. Some texts say
that perceived sharpness correlates best with the 50% value of the mtf
(where contrast has dropped by half) and others state that the
important values for perceived image sharpness are between 0,5 and 2
line pairs per mm at a viewing distance of 13,5 inches. Are those
values related to each other (and is it due to my minor knowledge that
I do not see that) or are they really in conflict?
Thanks for your input!
Marc
|
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