Inventor
ECHIZEN ISAO
JP20 patents
⚠️ This page may combine multiple inventors who share the name “ECHIZEN ISAO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
19 patentsUS6563935B1May 13, 2003
Method of extracting digital watermark information and method of judging bit value of digital watermark information
HITACHI LTD81 citations97
US6418232B1Jul 9, 2002
Method of authenticating digital-watermark pictures
HITACHI LTD142 citations97
US6711276B1Mar 23, 2004
Control method and apparatus for embedding information in data
HITACHI LTD57 citations96
US6728408B1Apr 27, 2004
Water-mark embedding method and system
HITACHI LTD35 citations93
US7113613B2Sep 26, 2006
Watermark information detection method
HITACHI LTD29 citations92
US7047407B2May 16, 2006
Network system enabling transmission control
HITACHI LTD35 citations92
US6584210B1Jun 24, 2003
Digital watermark image processing method
HITACHI LTD37 citations92
US6456727B1Sep 24, 2002
Method of extracting digital watermark information and method of judging but value of digital watermark information
HITACHI LTD25 citations92
US7065226B1Jun 20, 2006
Method for embedding information and extracting the same
HITACHI LTD23 citations91
US7478432B2Jan 13, 2009
Method and system for contents control
HITACHI LTD16 citations83
US7047412B2May 16, 2006
Digital watermark data embedding method, and digital watermark data embeddability analyzing method
HITACHI LTD19 citations82
US6865677B1Mar 8, 2005
Contents rendering control method, contents reproducing equipment, and contents distribution equipment
HITACHI LTD15 citations82
US7293294B2Nov 6, 2007
Method and apparatus for using contents
HITACHI LTD18 citations81
US6826291B2Nov 30, 2004
Method and system for embedding information into contents
HITACHI LTD11 citations74
US6970575B2Nov 29, 2005
Method of extracting digital watermark information and method of judging bit value of digital watermark information
HITACHI LTD5 citations73
US6650763B2Nov 18, 2003
Method of extracting digital watermark information and method of judging bit value of digital watermark information
HITACHI LTD12 citations73
US7499565B2Mar 3, 2009
Method of watermarking for binary images
HITACHI LTD6 citations63
US7310428B2Dec 18, 2007
Method of detecting digital watermark information
HITACHI LTD4 citations62
US7577843B2Aug 18, 2009
System and method for controlling contents by plurality of pieces of control information
HITACHI LTD0 citations42