Water-mark embedding method and system

(54) WATER-MARK EMBEDDING METHOD AND SYSTEM

(75) Inventors: Isao Echizen, Yokohama (JP); Hiroshi Yoshiura, Tokyo (JP); Masafumi Nakamura, Yokohama (JP); Takao Arai, Yokohama (JP); Toshifumi Takeuchi, Tokyo (JP)

(73) Assignee: Hitachi, Ltd., Tokyo (JP)

( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

(21) Appl. No.: 09/144,467

(22) Filed: Sep. 1, 1998

(30) Foreign Application Priority Data

Sep. 3, 1997 (JP) 9-238030

Apr. 16, 1998 (JP) 10-106037

(51) Int. CI.7 G06K 9/00; G06K 9/46;

G06K 9/32; H04L 9/00

(52) U.S. CI 382/232; 382/100; 382/294;

713/176

(58) Field of Search 382/100, 232,

382/238, 135, 282, 284, 294, 233, 154, 275, 289, 295, 296; 380/200, 34, 51, 201, 252, 287, 210; 345/419, 629, 634; 235/469;

707/104.1; 713/129, 126

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