title: Optical pattern recognition using circular harmonic expansion.
abstract: Presented in this paper is an optical implementation of a shift- and rotation-invariant pattern recognition technique. A computer-generated hologram is designed to match with one of the circular harmonic components of the target. Experimental results with simple photographic objects show that targets with different locations and orientations can be simultaneously recognized by the optical system.
authors.affiliation: Universite Laval, Departement de Physique, Laboratoire de recherches en optique et laser, Quebec, P.Q. GlK 7P4.
authors.forename: Y N
authors.initials: YN
authors.lastname: Hsu
authors.forename: H H
authors.initials: HH
authors.lastname: Arsenault