Blind estimation of PSF for out of focus video data

Author

Shekarforoush, H. ; Chellappa, R.

Author_Institution

Center for Autom. Res., Maryland Univ., College Park, MD, USA

fYear

1998

fDate

4-7 Oct 1998

Firstpage

742

Abstract

A method has been proposed for blindly estimating the point spread function (PSF) of video data. The PSFs of the images in a sequence are assumed to be of compact support and hence admit FIR modeling. The zeros (roots) of the optical transfer function (OTF)-i.e. the Fourier transform of the PSF-are first estimated by locating the singularities of the magnitude of the cross power spectrum. These roots are then used for spectrum factorization leading to complete polynomial approximation of the OTF. It has been shown that a 2D spectrum can be factorized under the assumption of local isotropy around the roots

Keywords

FIR filters; image sequences; optical transfer function; parameter estimation; poles and zeros; polynomial approximation; spectral analysis; video signal processing; 2D spectrum; FIR modeling; Fourier transform; PSF; blind estimation; cross power spectrum; optical transfer function; out of focus video data; point spread function; polynomial approximation; roots; sequence; singularities; spectrum factorization; zeros; Adaptive estimation; Automation; Blindness; Educational institutions; Finite impulse response filter; Fourier transforms; Higher order statistics; Parametric statistics; Polynomials; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Image Processing, 1998. ICIP 98. Proceedings. 1998 International Conference on

Conference_Location

Chicago, IL

Print_ISBN

0-8186-8821-1

Type

conf

DOI

10.1109/ICIP.1998.999057

Filename

999057