US 7,321,665 B2 | ||
Method of and apparatus for extracting watermark from repeatedly watermarked data | ||
Sang-heun Oh, Gyeonggi-do (Korea, Republic of) | ||
Assigned to Samsung Electronics Co., Ltd., Suwon-si (Korea, Republic of) | ||
Filed on Jun. 18, 2003, as Appl. No. 10/463,852. | ||
Claims priority of application No. 10-2002-0034137 (KR), filed on Jun. 18, 2002. | ||
Prior Publication US 2004/0042636 A1, Mar. 04, 2004 | ||
Int. Cl. G06K 9/00 (2006.01); H04N 1/40 (2006.01); H04L 9/00 (2006.01) |
U.S. Cl. 382—100 [358/3.28; 713/176] | 26 Claims |
1. A method of extracting a final watermark from original data into which an original watermark is repeatedly inserted, comprising:
extracting watermarks from the watermarked original data;
calculating a reliability of each bit of each of the extracted watermarks, the reliability indicating an extent to which the
extracted watermark corresponds to the original watermark; and
determining the final watermark based on the calculated reliability of each of the extracted watermarks by determining a bit
value having a highest calculated reliability among the calculated reliabilities of the bit values of the extracted watermarks
having a same digit as a bit value of the final watermark.
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