EP0935872B1
Expired / Lapsed
EP
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Watermarking an information signal
Assignee: Koninklijke Philips NV
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Filing: 1998-08-17
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Granted: 2001-11-21
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Expires: 2018-08-17
Abstract
No abstract record available.
Inventors
- 👤 Johan Paul Marie Gerard Linnartz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:19
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; H04N1/00; H04N1/00002; H04N1/00005; H04N1/00026; H04N1/00037; H04N19/00; G06T2201/00; G06T2201/005; G06T2201/0051; G06T2201/0061; G06T2201/0065; G06T2201/0083
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A method of detecting a multi-bit watermark in a signal, each bit (w(n)) of said
multi-bit watermark being represented by a respective watermark subpattem, comprising the
steps of: determining (21,22), for each watermark subpattern, a correlation
value (y(n)) indicating the extent to which said subpattern is present in the signal; combining (24,23) said correlation values to detect (D) whether the
watermark is present in the signal irrespective of its multi-bit value; and comparing (25) said correlation values (y(n)) and the corresponding
bits (w(n)) of an applied multi-bit value to obtain an indication (M) of to which extent the
detected watermark has said applied multi-bit value.
Claim 2
Dependent Claim
33 words
A method as claimed in claim 1, wherein said step of comparing comprises
calculating the sum of squares of differences between each correlation value and the
corresponding bit of the applied multi-bit value.
Claim 3
Dependent Claim
69 words
A method as claimed in claim 1, wherein the signal is a video image which is
watermarked by adding a watermark pattern to said image, the video image and the watermark
pattern being divided into blocks, the blocks of the watermark pattern constituting said
subpatterns, and wherein each bit of the multi-bit value is represented by whether or not a
subpattern has been added to a corresponding image block.
Claim 4
Dependent Claim
108 words
An arrangement for detecting a multi-bit watermark in a signal, each bit (w(n))
of said multi-bit watermark being represented by a respective watermark subpattern,
comprising: means for determining (21,22), for each watermark subpattern, a
correlation value (y(n)) indicating the extent to which said subpattern is present in the signal; means for combining (24,23) said correlation values to detect (D)
whether the watermark is present in the signal irrespective of its multi-bit value; and means for comparing (25) said correlation values (y(n)) and the
corresponding bits (w(n)) of an applied multi-bit value to obtain an indication (M) of to which
extent the detected watermark has said applied multi-bit value.
Claim 5
Independent Claim
68 words
A method of embedding a multi-bit watermark in a video image by adding a
watermark pattern to said image, comprising the steps of: dividing (11,12) the video image and said watermark pattern into
blocks, the blocks of the watermark pattern constituting subpatterns; and representing (10) each bit (w 1 ..w n ) of the multi-bit value by adding or
not adding a subpattern to the corresponding image block.
Claim 6
Dependent Claim
73 words
An arrangement for embedding a multi-bit watermark in a video image (P) by
adding a watermark pattern (W) to said image, comprising: means for dividing (11,12) the video image and said watermark pattern
into blocks, the blocks of the watermark pattern constituting subpattems; and means for adding (10) or not adding a subpattem to a corresponding
image block in accordance with a corresponding bit (w 1 ..w n ) of the multi-bit value.
References Cited (Backward Citations)
No citation records indexed.
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