Secure viewing of display units by image superposition and wavel

Details Secure viewing of display units by image superposition and wavel Secure viewing of display units by image superposition and wavel

1994-11-21

1996-07-16

Gregory, Bernarr E.

Cryptography

By modifying optical image

380 6, 380 59, 348 42, 359462, 359466, G09C 500, H04L 900

Patent

active

055374760

ABSTRACT:
Apparatus for masking a displayed image by mixing the image with a secondary image that is electronically generated to be related to the primary image that when combined with the primary image obscures viewing of the primary image. The primary image is generated in the form of a first set of wavelength bands and the secondary image is a second set of related wavelength bands. A filter is provided to absorb the second set of wavelength bands to permit secure viewing of the primary image.

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