Accession Number : AD0701327

Title :   THE USE OF HOLOGRAPHIC SUBTRACTION IN THE OPTICAL PROCESSNG OF RECONNAISSANCE DATA.

Descriptive Note : Research and development rept. Jun 68-Mar 69,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF

Personal Author(s) : Monahan,M. A. ; Bromley,K. ; Bryant,J. F. ; Thompson,B. J.

Report Date : 23 OCT 1969

Pagination or Media Count : 19

Abstract : A technique is designed to subtract an undesired portion of an image from a given optical scene. A wave reconstructed from a hologram is shifted in phase by pi radians relative to the wave originally stored; thus, if two nearly-identical images of an input plane, one derived from a hologram and the other a direct image, are superimposed upon each other at a viewing screen, the identical portions of the images are canceled, and the difference between the two is displayed. The method has been verified experimentally for both binary and continuous-tone transparencies. (Author)

Descriptors :   (*PHOTOGRAPHIC RECONNAISSANCE, DATA PROCESSING), PHOTOGRAPHY, INTERFERENCE, PHASE SHIFT CIRCUITS, LASERS, COHERENT RADIATION, PHOTOGRAPHIC IMAGES

Subject Categories : Holography
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE