Global Patent Index - EP 1034635 A1

EP 1034635 A1 2000-09-13 - WATERMARKING OF DIGITAL IMAGE DATA

Title (en)

WATERMARKING OF DIGITAL IMAGE DATA

Title (de)

WASSERZEICHEN VON DIGITALEN BILDDATEN

Title (fr)

FORMATION DE FILIGRANE DANS DES DONNEES D'IMAGES NUMERIQUES

Publication

EP 1034635 A1 (EN)

Application

EP 98956257 A

Priority

  • US 9822790 W
  • US 6350997 P

Abstract (en)

[origin: WO9922480A1] Digital watermarks can serve to indicate copyright ownership of digitized video. When video images are transmitted as transformed by discrete cosine transformation (DCT) for compression, with or without motion compensation, it is advantageous to include a watermark after transformation. To this end, a DCT watermark is generated for optimal visibility based on the original image data, and the generated watermark is superposed on the transformed data.

IPC 1-7 (main, further and additional classification)

H04K 1/00; G09C 5/00; H04L 9/00

IPC 8 full level (invention and additional information)

G06T 1/00 (2006.01); G09C 5/00 (2006.01); H04N 1/32 (2006.01); H04N 1/387 (2006.01); H04N 7/26 (2006.01); H04N 7/30 (2006.01); H04N 7/46 (2006.01); H04N 7/50 (2006.01)

CPC (invention and additional information)

H04N 19/577 (2014.11); G06T 1/0028 (2013.01); H04N 1/32165 (2013.01); H04N 1/32192 (2013.01); H04N 19/10 (2014.11); H04N 19/467 (2014.11); G06T 2201/0052 (2013.01); H04N 2201/3233 (2013.01); H04N 2201/327 (2013.01)

Citation (search report)

See references of WO 9922480A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9922480 A1 19990506; CA 2308402 A1 19990506; EP 1034635 A1 20000913; JP 2001522165 A 20011113

INPADOC legal status


2006-03-01 [D18D] EP-APPLICATION DEEMED TO BE WITHDRAWN: (DELETED)

2005-11-30 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20050503

2000-09-13 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000517

2000-09-13 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE