EP0903943A2
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EP
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Method and apparatus for superposing a digital watermark and method and apparatus for detecting a digital watermark
Assignee: Pioneer Corp
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Filing: 1998-09-14
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Granted: —
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Expires: 2018-09-14
Abstract
Abstract An apparatus for superposing a digital watermark for superposing digital watermark information on an information data signal bearing original information superposes digital watermark information on an information data signal bearing original information, for each unit block consisting of a group of pieces of information data. This apparatus is provided with an auxiliary embedding circuit 10 for embedding second digital watermark information in the information data; a blocking circuit 12 for dividing into the unit blocks the changed information data signal obtained by the auxiliary embedding circuit; and a main embedding circuit 20 for embedding first digital watermark information in the changed information data signal for each of the divided blocks. The second digital watermark information bears information for identifying the position of the divided unit block in a predetermined section of the information data signal. On the basis of the second watermark information, a detecting apparatus effects proper blocking with respect to the information data signal with the watermark embedded therein, so as to detect the first watermark information.
Inventors
- 👤 Takeshi c/o Corp. Res. and Dev. Lab. Nakamura
- 👤 Kazumi c/o Corp. Res. and Dev. Lab. Sugaya
- 👤 Yoshiaki C/O Corp. Res. And Dev. Lab. Moriyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:22
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/46; H04N19/467; G; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; G06T1/0064; G06T1/0071; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32154; H04N1/32165; H04N1/32203; H04N1/32208; H04N1/32352; H04N19/60; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; G06T2201/00; G06T2201/005; G06T2201/0052; G06T2201/0061; G06T2201/0065; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3269; H04N2201/327
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A method for superposing a digital watermark for
superposing digital watermark information on an information
data signal bearing original information, for each unit block
consisting of a group of pieces of information data, comprising
the steps of: embedding second digital watermark information in the
information data; dividing the changed information data signal thereby
obtained into the unit blocks; and embedding the first digital watermark information in
the changed information data signal for each of the divided
blocks, wherein the second digital watermark information bears
information for identifying a position of the divided unit
block in a predetermined section of the information data
signal.
Claim 2
Dependent Claim
20 words
The method for superposing a digital watermark
according to claim 1, wherein the information data signal is a
video signal.
Claim 3
Independent Claim
114 words
An apparatus for superposing a digital watermark
for superposing digital watermark information on an information
data signal bearing original information, for each unit block
consisting of a group of pieces of information data,
comprising: auxiliary embedding means for embedding second digital
watermark information in the information data; blocking means for dividing into the unit blocks the
changed information data signal obtained by said auxiliary
embedding means; and main embedding means for embedding first digital
watermark information in the changed information data signal
for each of the divided blocks, wherein the second digital watermark information bears
information for identifying a position of the divided unit
block in a predetermined section of the information data
signal.
Claim 4
Dependent Claim
20 words
The apparatus for superposing a digital watermark
according to claim 3, wherein the information data signal is a
video signal.
Claim 5
Dependent Claim
31 words
The apparatus for superposing a digital watermark
according to claim 3 or 4, wherein the second watermark
information is information of a random pattern generated on the
basis of an M-sequence.
Claim 6
Independent Claim
112 words
A method for detecting a digital watermark for
detecting digital watermark information from a changed
information data signal generated by superposing the digital
watermark information on an information data signal, for each
unit block consisting of a group of pieces of information data,
comprising the steps of: detecting second digital watermark information from the
changed information data signal, and recognizing a position of
a divided unit block in a predetermined section of the
information data signal; dividing the changed information data signal on the
basis of the recognized position into the unit blocks; and detecting first digital watermark information for each
of the divided unit blocks from the changed information data
signal.
Claim 7
Dependent Claim
20 words
The method for detecting a digital watermark
according to claim 6, wherein the information data signal is a
video signal.
Claim 8
Independent Claim
127 words
An apparatus for detecting a digital watermark
for detecting digital watermark information from a changed
information data signal generated by superposing the digital
watermark information on an information data signal, for each
unit block consisting of a group of pieces of information data,
comprising the steps of: position-identifying-information detecting means for
detecting second digital watermark information from the changed
information data signal, and recognizing a position of a
divided unit block in a predetermined section of the
information data signal; blocking means for dividing the changed information
data signal on the basis of the recognized position into the
unit blocks; and information detecting means for detecting from the
changed information data signal first digital watermark
information for each of the unit blocks divided by said
blocking means.
Claim 9
Dependent Claim
20 words
The apparatus for detecting a digital watermark
according to claim 8, wherein the information data signal is a
video signal.
Claim 10
Dependent Claim
23 words
The apparatus for detecting a digital watermark
according to claim 9, wherein the video signal bears an image
of a letter box type.
Claim 11
Dependent Claim
23 words
The apparatus for detecting a digital watermark
according to claim 9, wherein the video signal bears an image
of a pan scan type.
Claim 12
Independent Claim
48 words
The apparatus for detecting a digital watermark
according to any one of claims 8 to 11, wherein said position-identifying-information
detecting means detects the second
digital watermark information from the changed information data
signal on the basis of information of a random pattern
generated in accordance with an M-sequence.
References Cited (Backward Citations)
No citation records indexed.
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