![]() ![]() It is used by optical engineers to describe how the optics project light from the object or scene onto a photographic film, detector array, retina, screen, or simply the next item in the optical transmission chain. The optical transfer function ( OTF) of an optical system such as a camera, microscope, human eye, or projector specifies how different spatial frequencies are handled by the system. Note that the scale of the point source images (b,e) is four times smaller than the spoke target images. Images of a point source and a spoke target with high spatial frequency are shown in (b,e) and (c,f), respectively. As the optical transfer function of these systems is real and non-negative, the optical transfer function is by definition equal to the modulation transfer function (MTF). The optical transfer function of a well-focused (a), and an out-of-focus optical imaging system without aberrations (d). Illustration of the optical transfer function (OTF) and its relation to image quality.
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