DocumentCode :
2494634
Title :
The restoration of extended astronomical images using the spatially-variant point spread function
Author :
Weddell, S.J. ; Webb, R.Y.
Author_Institution :
Electr. & Comput. Eng., Univ. of Canterbury, Christchurch
fYear :
2008
fDate :
26-28 Nov. 2008
Firstpage :
1
Lastpage :
6
Abstract :
In this paper we address the problem of image restoration of extended astronomical objects, where the effects of inhomogeneous random media, such as atmospheric turbulence, result in distortion over the pupil plane. Distortions are usually expressed in terms of the point spread function (PSF) and can be used to restore an image with the application of a deconvolution algorithm. Since the PSF is generally spatially dependent, restoration of extended images within specific homogeneous (isoplanatic) regions is required. Inconsistencies at the borders of each region result in error boundaries between restored isoplanatic regions and the object. To minimise such distortion, we determine the optimal size of each isoplanatic region and then apply a linear filter to estimate the PSF between boundaries.
Keywords :
aberrations; astronomical image processing; astronomical techniques; deconvolution; image restoration; optical transfer function; PSF estimation; extended astronomical image restoration; image deconvolution algorithm; image distortion; image restoration problem; inhomogeneous random media effects; isoplanatic region optimal size; linear filter; point spread function; pupil plane; spatially variant PSF; Deconvolution; Image restoration; Moon; Optical distortion; Optical filters; Optical imaging; Optical noise; Planets; Random media; Space exploration; Image restoration; astronomical imaging; deconvolution; point-spread function;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Image and Vision Computing New Zealand, 2008. IVCNZ 2008. 23rd International Conference
Conference_Location :
Christchurch
Print_ISBN :
978-1-4244-3780-1
Electronic_ISBN :
978-1-4244-2583-9
Type :
conf
DOI :
10.1109/IVCNZ.2008.4762100
Filename :
4762100
Link To Document :
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