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Various optical data-processing techniques are reviewed in this article. Both coherent and incoherent optical systems are considered. Coherent systems are described in terms of spatial filtering concepts and two principal methods for implementing a general linear integral operator are discussed: one using space-domain reference function masks and one using frequency-domain spatial filters. Incoherent systems are described in terms of geometrical optics.
A. Vander Lugt (Mon,) studied this question.