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SG97823A1 - A system for proving an unobstrusive watermark in a secure document - Google Patents

A system for proving an unobstrusive watermark in a secure document

Info

Publication number
SG97823A1
SG97823A1 SG9906234A SG1999006234A SG97823A1 SG 97823 A1 SG97823 A1 SG 97823A1 SG 9906234 A SG9906234 A SG 9906234A SG 1999006234 A SG1999006234 A SG 1999006234A SG 97823 A1 SG97823 A1 SG 97823A1
Authority
SG
Singapore
Prior art keywords
unobstrusive
watermark
proving
secure document
secure
Prior art date
Application number
SG9906234A
Inventor
Qibin Sun
Peirong Feng
Original Assignee
Kent Ridge Digital Labs
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kent Ridge Digital Labs filed Critical Kent Ridge Digital Labs
Priority to SG9906234A priority Critical patent/SG97823A1/en
Publication of SG97823A1 publication Critical patent/SG97823A1/en

Links

SG9906234A 1999-12-14 1999-12-14 A system for proving an unobstrusive watermark in a secure document SG97823A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SG9906234A SG97823A1 (en) 1999-12-14 1999-12-14 A system for proving an unobstrusive watermark in a secure document

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SG9906234A SG97823A1 (en) 1999-12-14 1999-12-14 A system for proving an unobstrusive watermark in a secure document

Publications (1)

Publication Number Publication Date
SG97823A1 true SG97823A1 (en) 2003-08-20

Family

ID=29707955

Family Applications (1)

Application Number Title Priority Date Filing Date
SG9906234A SG97823A1 (en) 1999-12-14 1999-12-14 A system for proving an unobstrusive watermark in a secure document

Country Status (1)

Country Link
SG (1) SG97823A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5790703A (en) * 1997-01-21 1998-08-04 Xerox Corporation Digital watermarking using conjugate halftone screens
EP0859503A2 (en) * 1997-02-12 1998-08-19 Nec Corporation Electronic watermark system
WO1999035836A2 (en) * 1998-01-09 1999-07-15 Koninklijke Philips Electronics N.V. Embedding and detecting a watermark in images

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5790703A (en) * 1997-01-21 1998-08-04 Xerox Corporation Digital watermarking using conjugate halftone screens
EP0859503A2 (en) * 1997-02-12 1998-08-19 Nec Corporation Electronic watermark system
WO1999035836A2 (en) * 1998-01-09 1999-07-15 Koninklijke Philips Electronics N.V. Embedding and detecting a watermark in images

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