Point Spread Function (PSF)

PSF stands for Point Spread Function which describes how an imaging system (ex. Telescope and CCD camera) image a singular point source such as a star. When a CCD image the object is divided into discrete point objects of varying intensity, each object is computed as a sum of the PSF of each point. The PSF is typically determined entirely by the imaging system and thus the entire image can be described by knowing the optical properties of the system. Understanding this, any CCD image can be studied through PSF applications.

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