NDLI: Asymmetric, space-variant point spread function model for a spherical lens optical system

Content Provider	IEEE Xplore Digital Library
Author	Costello, T.P. Mikhael, W.B.
Copyright Year	1999
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Central Florida, Orlando, FL, USA (Costello, T.P.)
Abstract	An asymmetric analytical model is presented for the space variant (SV) point-spread-function (PSF) of an optical system consisting of a single spherical lens with a rectangular aperture. The model is an improvement over a prior model in that additional parameters allow shifting of the central lobe and asymmetry of the sidelobes. Both of these effects are seen in diffraction-based PSF models as field angle is increased. The model is useful for applying certain SV restoration methods to digital images formed by simple optical systems, since it significantly reduces the memory required to store PSF sample functions. The proposed model uses eight parameters for any specific field position. The model is adapted to PSFs developed from diffraction theory, using an adaptive system with gradient descent parameter adjustment. Data is presented that characterizes the accuracy of the adapted model to a physical PSF as a function of field angle.
Starting Page	64
Ending Page	67
File Size	404250
Page Count	4
File Format	PDF
ISBN	0780354710
DOI	10.1109/ISCAS.1999.779943
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-05-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lenses Optical sensors Brain modeling Image restoration Digital images Sensor arrays Apertures Optical diffraction Optical arrays Image storage
Content Type	Text
Resource Type	Article

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