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:

1969-10-23

Pagination or Media Count:

19.0

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