Image recorded product, image recording system, image reproducin

Details Image recorded product, image recording system, image reproducin Image recorded product, image recording system, image reproducin

1997-03-13

2000-08-01

Pitts, Andrea L.

Printed matter

Having revealable concealed information, fraud preventer or...

Identifier

283 94, 283107, 283110, 283112, 428195, 428913, 428914, B42D 1500

Patent

active

06095566&

ABSTRACT:
An image recording system superimposes, on an original image, an additional image which is same as at least any one of visible characters, symbols and numerals recorded on a recorded product and records the superimposed image on the recorded product as an image for certification. The additional image superimpose-recorded on the recorded product cannot visually be recognized and it is permitted to be visible when a universal optical filter is used.

REFERENCES:
patent: 5344808 (1994-09-01), Watanabe et al.
patent: 5489567 (1996-02-01), Koshizuka et al.
Eurocrypt '94, pp. 1-12, 1994, Moni Naor, et al., "Visual Cryptography".
Image Deep Cryptography (Method and Application), pp. 58-61, 1993, "Chapter III--Method of Utilizing Threshold Information" (with partial English translation).
"Visual Cryptographic Scheme of Information Through the Human Visual System", p. 126, 1995, Kazuhito Oka, et al. (With English translation).

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