THE USE OF HOLOGRAPHIC SUBTRACTION IN THE OPTICAL PROCESSNG OF RECONNAISSANCE DATA.
Research and development rept. Jun 68-Mar 69,
NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF
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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