title: Holographic subtraction.
abstract: A holographic technique by which two dissimilar optical fields can be subtracted to yield only their difference is presented. The principle underlying this technique is that of optical interference between a holographically reconstructed field and a direct real-time one. Experimental verification is presented for the three cases of image-plane, fourier-transform, and Fresnel side-band holograms. Also considered is the application of this concept to change detection between photographic transparencies of some scene taken at different times.
authors.forename: K
authors.initials: K
authors.lastname: Bromley
authors.forename: M A
authors.initials: MA
authors.lastname: Monahan
authors.forename: J F
authors.initials: JF
authors.lastname: Bryant
authors.forename: B J
authors.initials: BJ
authors.lastname: Thompson