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Optical Engineering

Symbolic Substitution Implemented By Spatial Filtering Logic
Author(s): Karl-Heinz Brenner; Adolf W. Lohmann; Thomas M. Merklein
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Paper Abstract

Symbolic substitution is a method of performing parallel optical logic by recognition and substitution of structural elements. With spatial filtering it is possible to perform logic operations without an active logic gate. This paper describes how symbolic substitution can be implemented optically by use of spatial filtering. Earlier implementations used an additive logic, where shifted versions of the input pattern were added and then thresholded. Our new method is a multiplicative method that sequentially tests the pattern elements.

Paper Details

Date Published: 1 April 1989
PDF: 6 pages
Opt. Eng. 28(4) 284390 doi: 10.1117/12.7976966
Published in: Optical Engineering Volume 28, Issue 4
Show Author Affiliations
Karl-Heinz Brenner, Universitat Erlangen-Nurnberg (Germany)
Adolf W. Lohmann, Universitat Erlangen-Nurnberg (Germany)
Thomas M. Merklein, Universitat Erlangen-Nurnberg (Germany)


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