Abstract

Conventional signal and image processing techniques are limited in resolution by the bandwidth or aperture of the encoding device; in optical terms, this resolution is set by the diffraction limit, as defined by the Rayleigh criterion. The information retrievable from the signal is thus inherently restricted, even at low noise levels. In recent years a number of techniques for overcoming this limitation and achieving superresolution have been proposed; among these, the iterative extrapolation procedures which exploit a priori information, such as known signal constraints, have been extensively studied.

© 1982 Optical Society of America

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