Computer Science
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1744..161c&link_type=abstract
Proc. SPIE Vol. 1744, p. 161-170, Instrumentation for Magnetospheric Imagery, Supriya Chakrabarti; Ed.
Computer Science
Scientific paper
In a companion paper, Curtis, et. al. discuss coded aperture sensors appropriate for viewing an extended object such as Earth's magnetosphere seen at relatively close range. The aperture codes used may be different from those generally found in X or (gamma) ray telescopes, where the field of view (FOV) may encompass an entire region containing some small number of point sources. The aperture codes described here find application in imaging an extended object which may have relatively low contrast, and whose lateral limits extend beyond the FOV of the sensor. Those elements of an extended object lying near the FOV limits are only partially coded, that is, flux from those elements cannot cast a shadow of the entire aperture code onto the detector, as can elements near the center of the FOV. This has consequences for the algorithms used to reconstruct the image. The object field is divided into a number of elements which is smaller than the number of detector pixels, and a least squares fit to the data is performed. A discussion of the methods used for choosing the matrices representing the aperture codes is given, and computer simulations of the effects of noise are described.
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