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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 12, Iss. 12 — Dec. 1, 1995
  • pp: 2593–2603

Implementation of a modified Richardson-Lucy method for image restoration on a massively parallel computer to compensate for space-variant point spread of a charge-coupled-device camera

Mohammad Faisal, Aaron D. Lanterman, Donald L. Snyder, and Richard L. White  »View Author Affiliations


JOSA A, Vol. 12, Issue 12, pp. 2593-2603 (1995)
http://dx.doi.org/10.1364/JOSAA.12.002593


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Abstract

Several imaging devices are characterized by a space-variant point-spread function (PSF), such as the wide-field/planetary camera of the Hubble Space Telescope (HST). Several techniques for image recovery that use data from such imagers approximate the space-variant PSF by a space-invariant PSF. A modified Richardson-Lucy method is implemented that accommodates the space-variant PSF of the HST as well as corrections for background counts, nonuniform flat field, and readout noise. The implementation runs on the DEC mppl2000 Sx/Model 200 massively parallel computer. Restorations of simulated HST images are obtained with a space-variant PSF and, for comparison, with a space-invariant approximation. Results of these processing methods are compared, and it is found that a residual artifact appears in restorations when a space-invariant PSF is used owing to the mismatch of the PSF kernel used in the restoration and the space-variant one underlying the image acquired with the telescope. This residual artifact is effectively eliminated when the processing is based on the space-variant PSF.

© 1995 Optical Society of America

History
Original Manuscript: April 10, 1995
Manuscript Accepted: June 28, 1995
Published: December 1, 1995

Citation
Mohammad Faisal, Richard L. White, Aaron D. Lanterman, and Donald L. Snyder, "Implementation of a modified Richardson-Lucy method for image restoration on a massively parallel computer to compensate for space-variant point spread of a charge-coupled-device camera," J. Opt. Soc. Am. A 12, 2593-2603 (1995)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-12-12-2593

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