### Point-Spread Function

**(PSF)**
(function describing an optical system's response to a point of light)

A **Point-Spread Function** (**PSF**) is a description of the
response of an optical system (such as a telescope) to
incoming light from a point, consisting of a mathematical
function describing the light-pattern expected on the Focal Plane.
An example would be a function that describes an Airy Disk.

There are theories associating specific mathematical
functions to particular Aperture shapes (e.g., rectangles, slits, circles)
and sizes.

**PSF Subtraction** (for **Point Spread Function Subtraction**)
is post-processing designed to sharpen images by nullifying
part of the Airy Disk's etc., e.g., from multiple images.

(*telescopes,optics,function*)
http://en.wikipedia.org/wiki/Point_spread_function

**Referenced by:**

PSF Fitting

Speckle Suppression

index