Encoded hologram for producing a machine readable image and a hu

Details Encoded hologram for producing a machine readable image and a hu Encoded hologram for producing a machine readable image and a hu

1993-08-31

1996-03-12

Gonzalez, Frank

Optical: systems and elements

Holographic system or element

Authentication

359 10, 359 24, 359 30, 359 22, 283 86, G03H 100, B42D 1500

Patent

active

054991161

ABSTRACT:
An encoded hologram that produces a first image and a second image pursuant to playback illumination, wherein the first image is resolvable by human vision while the second image is not resolvable by human vision when the playback illumination comprises non-coherent broad band illumination, and wherein the second image is machine readable when the hologram is illuminated with playback illumination that is based on the original reference beam.

REFERENCES:
patent: 4880286 (1989-11-01), Ih
patent: 5111312 (1992-05-01), Stewart
patent: 5145212 (1992-09-01), Mallik
patent: 5319476 (1994-06-01), Yamazaki et al.

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