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Optical Engineering

Rotation-Invariant Pattern Recognition
Author(s): H. H. Arsenault; Y N. Hsu; K. Chalasinska-Macukow
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Paper Abstract

Matched filters with signal-to-noise ratios that are space-invariant and rotation-invariant with respect to the target have been developed. Our approach has been to extract from the target one or more circular harmonic components and to use a filter matched to these components. The technique has been implemented both digitally and with an optical processor using com-puter-generated holograms. To discriminate between objects that are almost similar, a pseudo-object is used to generate the matched filter. The technique was introduced previously as an ad hoc method; a more systematic approach based on system constraints suggests the existence of other rotation-invariant linear filters.

Paper Details

Date Published: 1 December 1984
PDF: 5 pages
Opt. Eng. 23(6) 236705 doi: 10.1117/12.7973367
Published in: Optical Engineering Volume 23, Issue 6
Show Author Affiliations
H. H. Arsenault, Universite Laval (Canada)
Y N. Hsu, Universite Laval (Canada)
K. Chalasinska-Macukow, Universite Laval (Canada)

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