Modulation-transfer-function (MTF) measurement often involves the use of three-
and four-bar resolution targets. In the conversion of three- and four-bar image
data to MTF, biased results can occur when we use series-expansion techniques
appropriate for square-wave targets of infinite extent. For systems where the
image data are digitally recorded, a convenient and accurate conversion of
bar-target data to MTF can be performed using a Fourier-domain method.
© 1995 Optical Society of America
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