Cryptography – By modifying optical image
Patent
1988-10-06
1990-04-03
Tarcza, Thomas H.
Cryptography
By modifying optical image
350167, 355 52, 250568, 235454, 235462, 235470, G09C 500, G02B 2700, G03B 2768, G06K 710
Patent
active
049147005
ABSTRACT:
Apparatus for and method of unscrambling a parallax panoramagram that is a lineticular dissection of a bar code formed by scrambling the bar code in accordance with a graticule formed of a plurality of parallel contiguous focussing elements disposed at a spatial frequency greater than the modular spatial frequency of the bar code. The method includes positioning said panoramagram contiguous to the opposite surface of a light transparent screen having a plurality of elongated parallel line elements including focussing surfaces disposed in common along a first surface of the screen, the spatial frequency of those line elements being matched to the spatial frequency of the focussing elements. Positioning is achieved so that the line elements are disposed substantially parallel to the lines in the lineticular dissection.
A beam of light is used to scan the panoramagram by moving the beam across said first surface of the screen transversely to the axes of the line elements, the beam having a cross-section dimension, where incident on the screen, not greater than the width of the line element. Light reflected from the scan of the beam across a registered panoramagram and screen, is converted into electrical signals representing an unscrambled version of the bar code.
REFERENCES:
patent: 3781109 (1973-12-01), Mayer, Jr. et al.
patent: 4023902 (1977-05-01), Ungerman
patent: 4202626 (1980-05-01), Mayer, Jr. et al.
patent: 4420221 (1983-12-01), Sparks
Tarcza Thomas H.
Wallace Linda J.
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