amplitude transfer function (ATF)
The Fourier transform of the amplitude point-spread function (PSF), it is also the transfer function for a coherent imaging system. The ATF and the Pupil Function are essentially the same, but by convention the Pupil Function is dimensionless and normalized to a value between 0 and 1.
Synonyms: coherent transfer function
See also: amplitude point-spread function, optical transfer function, coherent imaging system, modulation transfer function, pupil function
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