Naslov
INFRARED STEGANOGRAPHY WITH INDIVIDUAL SCREENING SHAPES APPLIED TO POSTAGE STAMPS WITH SECURITY FEATURES

Autori
Rudolf, Maja ; Stanić Loknar, Nikolina ; Žiljak Stanimirović, Ivana

Izvornik
Tehnički vjesnik : znanstveno-stručni časopis tehničkih fakulteta Sveučilišta u Osijeku (1330-3651) 22 (2015), 4; 939-945

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
CMYKIR separacija; individualni rasterski element; poštanske marke sa sigurnosnim svojstvima; steganografija
(CMYKIR separation; individual screen element; infrared design; postage stamps with security features; steganography)

Sažetak
Designing a postage stamp requires positioning of graphic security elements in a limited small format, so the design is made for two states: for the visible spectrum and the infrared spectrum. Individual screening elements are introduced as security elements in the steganography of invisible pictures in the 700 to 1000 nm spectrum. The CMYKIR theory of hiding the infrared message in the picture is extended by mixing process inks with the control of spot twins of the same color tone in the X0 and X40 states. Two pictures are integrated in the security print ; a multicolor picture visible to the naked eye, and another hidden picture visible when illuminated with an IR detecting instrument. The CMYKIR method is joined with the new element’s algorithm used for dispersing of the hidden picture’s (“Z picture’s”) fringes. This kind of steganography is applied in the design of postage stamps and it is a new way of securing them.

Izvorni jezik
Engleski

Znanstvena područja
Grafička tehnologija

POVEZANOST RADA