Sharpness: What is it and how is it measured? - imatest

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Imatest

sharp blurred

rise distance

frequency domain

cycles

line pairs

Line pairs per millimeter lp/mm

distance

cycles/pixel C/P

line

widths/picture height LW/PH

Modulation Transfer Function (MTF) Spatial Frequency Response (SFR)

Green is for geeks.

isn’t

Experience has shown that the best indicators of image sharpness are the spatial frequencies where MTF is 50% of its low frequency value (MTF50) or 50% of its peak value (MTF50P).

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Imatest Master

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SFRplus

SFRplus

eSFR ISO

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≥ ≤

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line pairs per millimeter (lp/mm) x Line widths per picture height (LW/PH) 2 * lp/mm * (picture height in mm) cycles per pixel C/P

Imatest (Upper-left) A narrow image that illustrates the tones of the averaged edge. It is aligned with the average edge profile (spatial domain) plot,immediately below. Average Edge (Spatial domain):

MTF (Frequency domain): MTF50

MTF at Nyquist

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¯

optimum aperture

Imatest 3.6+ Lens MTF response

system MTF response often exceeds it

MTF50(Line Widths ⁄ inch on the print) =

MTF50(LW ⁄ PH) Print height in inches



Imatest SFR



The ideal response would have high MTF below the Nyquist frequency and low MTF at and above it.

Slanted edge algorithm (calculation details) ISO standard SFR









x x

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Imatest’s

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Sharpness: What is it and how is it measured? - imatest

Imatest sharp blurred rise distance frequency domain cycles line pairs Line pairs per millimeter lp/mm distance cycles/pixel C/P line widths...

8MB Sizes 3 Downloads 45 Views

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