modulation transfer function

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mod·u·la·tion trans·fer func·tion (MTF),

in testing radionuclide detectors or radiographic systems, the efficiency, at each spatial frequency, of reproducing the variation (contrast) in the object density or signal in the image; it is an expression of spatial resolution and is used to evaluate imaging systems and their components; the integral of the line spread function; also known as the frequency response function or contrast transmission function; usually given as a plot of percentage amplitude response versus frequency in cycles per millimeter.
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Resolution was assessed using modulation transfer functions (MTFs).
Modulation Transfer Function Measurement Method And Results For the Orbview-3 High Resolution Imaging Satellite, Proceedings of ISPRS XXXV, Istambul, July 2004