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Proceedings Paper

Image restoration for the Hubble Space Telescope
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Paper Abstract

The Hubble Space Telescope image quality was degraded significantly as a result of the spherical aberration in the primary mirror. Repairs made during the first servicing mission have restored HST's optical performance to the original design specifications. This paper examines not only how effective image restoration has been for the data from the first three and a half years of the mission, but also demonstrates the applicability of the same deconvolution algorithms to postservicing mission images. A variety of well-known image restoration techniques, such as Wiener filters, Richardson-Lucy, Jansson-van Cittert, CLEAN, and maximum entropy, have been applied to HST imaging with reasonable success. However, all techniques have been hampered by incomplete knowledge of the point spread function and the space variance of the point spread function (PSF) in the Wide Field/Planetary Camera, HST's most frequently used imager. After the servicing mission, the COSTAR-corrected Faint Object Camera acquires a space-variant PSF. Restoration is further complicated by time variance of the PSF resulting from both long-term and short-term (orbital period) changes in focus, problems which are not likely to be ameliorated by the servicing mission. Thus, it will be important to continue the efforts in modeling the HST optical system and apply deconvolution methods in order to attain the best scientific results from the telescope.

Paper Details

Date Published: 1 June 1994
PDF: 8 pages
Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176820
Show Author Affiliations
Robert James Hanisch, Space Telescope Science Institute (United States)

Published in SPIE Proceedings Vol. 2198:
Instrumentation in Astronomy VIII
David L. Crawford; Eric R. Craine, Editor(s)

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