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.
© 1971 Optical Society of America
Original Manuscript: March 5, 1970
Published: January 1, 1971
K. Bromley, M. A. Monahan, J. F. Bryant, and B. J. Thompson, "Holographic Subtraction," Appl. Opt. 10, 174-181 (1971)