amplitude point-spread function (APSF)
The impulse response of a coherent imaging system. It forms a Fourier Transform pair with the system's amplitude transfer function. The square of the amplitude point-spread function is the intensity point-spread function of an incoherent imaging system.
Synonyms: amplitude-spread function , coherent spread function
See also: point-spread function , intensity point-spread function , coherent imaging system , pupil function , Fourier transform
