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Image recovery from data acquired with a charge-coupled-device camera

Donald L. Snyder and Abed M. Hammoud from the Electronic Systems and Signals Research Laboratory, Washington University, and Richard L. White from Space Telescope Science Institute.

Journal of the Optical Society of America A - Vol. 10, No. 5/May 1993

A model for data acquired with the use of a charge-coupled-device camera is given and is then used for developing a new iterative method for restoring intensities of objects observed with such a camera. The model includes the effects of point spread, photo-conversion noise, readout noise, nonuniform flat-field response, nonuniform spectral response, and extraneous charge carriers resulting from bias, dark current, and both internal and external background radiation. An iterative algorithm is identified that produces a sequence of estimates converging toward a constrained maximum-likelihood estimate of the intensity distribution of an imaged object. An example is given for restoring images from data acquired with the use of the Hubble Space Telescope.

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This research was supported in part by the National Science Foundation under grant MIP-9101991 and the Division of Research Resources of the National Institutes of Health under grant RR001380. R. L. White appreciates the support of the Visiting Fellows Program at the Joint Institute for Laboratory Astrophysics of the University of Colorado. Figures 2 and 3 are based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.