Method and apparatus for producing a covert holographic image
OwnerKenneth A. Haines, Debby L. Hainesinventors
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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.
Claims15
A hologram having holographic pattern thereon for reconstructing a covert reconstructed image that is not recognizable by a user but which may be made recognizable by passing said reconstructed image through optical modifying means.
A method for making a hologram comprising the step of recording a holographic pattern for reconstructing a covert reconstructed image that is not recognizable by a user but which may be made recognizable by passing said reconstructed image through optical modifying means.
Dependencies are inferred from the claim text.