mtf and perceived sharpness

Discussion in 'Optometry Archives' started by Marc Wossner, Jan 29, 2007.

  1. Marc Wossner

    Marc Wossner Guest

    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 Wossner, Jan 29, 2007
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  2. Marc Wossner

    otisbrown Guest

    Clarification for the reader:

    M.T.F = Modulation Transfer Function.

    otisbrown, Jan 29, 2007
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  3. Marc Wossner

    A Lieberma Guest

    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.


    A Lieberma, Jan 30, 2007
  4. Marc Wossner

    otisbrown Guest

    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.

    otisbrown, Jan 30, 2007
  5. Marc Wossner

    Marc Wossner Guest

    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 Wossner, Jan 30, 2007
  6. Marc Wossner

    Marc Wossner Guest

    Yes I know about those problems and that´s why I keep wondering why
    the values I stated at the beginning are regarded as important for
    perceived sharpness. Maybe they are just picked as samples a lot of
    people can agree on but if so no source says it clearly. That´s why I
    ´m confused.

    Marc Wossner, Jan 31, 2007
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