Encoded hologram for producing a machine readable image and a human readable image
US5499116A · kind A · utility
6Cited by
4References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1993 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Aug 31, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/33
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.