title: Rotation-invariant discrimination between almost similar objects.
abstract: A modified circular harmonic filter may be used for the rotation-invariant discrimination of a target from another object which contains the same pattern as the target. The method is illustrated by the experimental rotation-invariant detection of the letter F in the presence of the letter E.
authors.affiliation: Universite Laval, Departement de Physique, Laboratoire de recherches en optique et laser, Quebec, P. Q. GlK 7P4.
authors.forename: H H
authors.initials: HH
authors.lastname: Arsenault
authors.forename: Y N
authors.initials: YN
authors.lastname: Hsu