title: Methods of increasing discrimination in optical filtering.
abstract: Optical spatial filtering techniques for pattern detection and several methods of increasing the discrimination between similar patterns are described. The use of high signal spectrum-to-reference beam intensities is found to be the most useful of these methods, and the properties of filters of alphanumeric characters made in this way are compared with linear filters.
authors.forename: R A
authors.initials: RA
authors.lastname: Binns
authors.forename: A
authors.initials: A
authors.lastname: Dickinson
authors.forename: B M
authors.initials: BM
authors.lastname: Watrasiewicz