Cryptography – Electric signal modification – Having production of printed copy
Reexamination Certificate
2005-02-22
2005-02-22
Swann, Tod R. (Department: 2767)
Cryptography
Electric signal modification
Having production of printed copy
C380S054000, C380S055000, C380S001000, C283S072000, C283S073000, C283S085000
Reexamination Certificate
active
06859534
ABSTRACT:
This invention relates generally to a method and apparatus, as implemented by a software program on a computer system, for digitally producing counterfeit-deterring scrambled or coded indicia images, typically in a printed form. This method and system are capable of combining a source image with a latent image so the scrambled latent image is visible only when viewed through a special decoder lens. The digital processing allows different latent images to be encoded according to different parameters. Additionally, latent images might be encoded into single component colors of an original visible image, at various angles from each other.A second embodiment teaches a method of forming an optical surface having diffraction properties that vary over the optical surface in accordance with a security graphic image that includes an encoded recognizable indicium formed as a parallax panoramagram image through a lenticular line screen.
REFERENCES:
patent: 3635778 (1972-01-01), Rice et al.
patent: 3642346 (1972-02-01), Dittmar
patent: 3937565 (1976-02-01), Alasia
Coddington Trevor Quick
McHale & Slavin PA
Swann Tod R.
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