Method and apparatus for producing a covert holographic image
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United States of America Patent
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N/A
Issued Date -
Nov 7, 2002
app pub date -
May 31, 2002
filing date -
Jun 7, 1996
priority date (Note) -
Abandoned
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Abstract
A hologram having a covert image is made by recording on the hologram an object beam that will reconstruct an unrecognizable, scrambled image. The scrambled image can be modified to form a recognizable image by passing the scrambled image through a plate overlying the hologram.
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