EP0859503A2
Expired / Lapsed
EP
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Electronic watermark system
Assignee: NEC Corp
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Filing: 1998-02-12
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Granted: —
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Expires: 2018-02-12
Abstract
Abstract An electronic watermark system invisibly embeds watermark information into original image data and the watermarked image data is transferred to a first medium (504, 604). At the same time, the embedded watermark information is transferred to a second medium (505, 605). When a medium questioned is found, its watermark information can be easily identified by searching the second medium. Alternatively, the watermarked image data and the embedded watermark information are transferred to different storage areas (705, 706) of the same medium (704), respectively.
Inventors
- 👤 Hirotaka Nakano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 05:31
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/00086; G11B20/0021; G06; G06T; G06T1/00; G06T1/0021; G11B20/00094; G11B20/00485; G11B20/00557; G11B20/00855; G11B20/00884; H; H04; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32154; H04N1/32165; H04N1/32267; H04N1/32277; H04N19/00; H04N19/46; H04N19/467; H04N19/60; H04N19/61; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; G06T2201/00; G06T2201/005; G06T2201/0052; G06T2201/0065; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3235; H04N2201/3269; H04N2201/327; H04N2201/3274; H04N5/00; H04N5/76; H04N5/78; H04N5/781; H04N9/806; H04N9/8063
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
56 words
A system comprising an information generator (104) for generating
watermark information; and a combiner (103) for invisibly embedding the
watermark information into original image data to produce
watermarked image data, characterized by comprising: a transfer controller (108, 109) for transferring the
watermarked image data to a first medium and the watermark
information to a second medium.
Claim 2
Dependent Claim
26 words
The system according to claim 1, wherein the transfer
controller further transfers medium identification information
identifying the first medium to the second medium to allow
retrieval.
Claim 3
Dependent Claim
51 words
The system according to claim 1 or 2, wherein the first medium is a first storage medium (504) for
storing the watermarked image data; and the second medium is a second storage medium (505)
for storing the watermark information and medium identification
information identifying the first storage medium to allow
retrieval.
Claim 4
Dependent Claim
21 words
The system according to claim 3, wherein the medium
identification information is a manufacture serial number of the
first storage medium.
Claim 5
Dependent Claim
56 words
The system according to claim 1 or 2, wherein the first medium is a communication medium through
which the watermarked image data is transmitted to a destination
(604) in a communication network; and the second medium is a storage medium (605) for
storing the watermark information and medium identification
information identifying the destination to allow retrieval.
Claim 6
Dependent Claim
21 words
The system according to claim 5, wherein the medium
identification information is an address of the destination in
the communication network.
Claim 7
Independent Claim
52 words
A system comprising: an information generator (104) for generating
information; and a combiner (103) for invisibly embedding the
watermark information into original image data to produce
watermarked image data, characterize by comprising: a transfer controller (108, 109) for transferring
both the watermarked image data and the watermark information to
a single medium.
Claim 8
Dependent Claim
60 words
The system according to claim 7, wherein the single
medium is a storage medium (704) having a first storage area (705)
for storing the watermarked image data and a second storage area
(706) for storing the watermark information, wherein the second
storage area is dedicated to the watermark information so that
only the watermark information is allowed to be read.
Claim 9
Dependent Claim
25 words
The system according to claim 7 or 8, wherein the
transfer controller encrypts the watermark information and
transfers encrypted watermark information to the single medium.
Claim 10
Independent Claim
109 words
A system for checking whether a medium questioned is
authorized, characterized by comprising: a storage (505, 605) for storing watermark
information and medium identification information identifying a
medium, the medium storing watermarked image data which is
produced by invisibly embedding the watermark information into
original image data; a retrieval controller (505, 605) for retrieving
watermark information corresponding to medium identification
information of the medium questioned from the storage; a watermark extractor (207) for extracting watermark
information questioned from image data stored in the medium
questioned; and a checker (208, 209) for checking whether the medium
questioned is authorized by comparing the extracted watermark
information with the retrieved watermark information.
Claim 11
Independent Claim
86 words
A system for checking whether a medium questioned is
authorized, the medium questioned having a first storage area for
storing watermarked image data and a second storage area for
storing watermark information, the system characterized by
comprising: a watermark extractor (207) for extracting watermark
information from image data stored in the medium questioned; and a checker (208, 209) for checking whether the medium
questioned is authorized by comparing the extracted watermark
information with the watermark information stored in the second
storage area of the medium questioned.
Claim 12
Independent Claim
109 words
A method for checking whether a medium questioned is
authorized, comprising the steps of: generating watermark information: and invisibly embedding the watermark information into
original image data to produce watermarked image data, characterized by the steps of: transferring the watermarked image data to an
authorized medium; transferring the watermark information and medium
identification information identifying the authorized medium to
a retrieval medium; retrieving watermark information corresponding to
medium identification information of the medium questioned from
the retrieval medium; extracting watermark information questioned from
image data stored in the medium questioned: and checking whether the medium questioned is authorized
by comparing the extracted watermark information with the
retrieved watermark information.
Claim 13
Independent Claim
118 words
A method for checking whether image data questioned
is authorized, comprising the steps of: generating watermark information; and invisibly embedding the watermark information into
original image data to produce watermarked image data, characterized by the steps of: transmitting the watermarked image data to an
authorized destination through a network; transferring the watermark information and medium
identification information identifying the authorized
destination to a retrieval medium; retrieving watermark information corresponding to
identification information of a data provider providing the image
data questioned from the retrieval medium; extracting watermark information from the image data
questioned received from the data provider; and checking whether the image data questioned is
authorized by comparing the extracted watermark information with
the retrieved watermark information.
Claim 14
Independent Claim
84 words
A method for checking whether a medium questioned is
authorized, comprising the steps of: generating watermark information; and invisibly embedding the watermark information into
original image data to produce watermarked image data, characterized by the steps of: transferring both the watermarked image data and the
watermark information to an authorized medium; extracting watermark information from image data
stored in the medium questioned; and checking whether the medium questioned is authorized
by comparing the extracted watermark information with watermark
information stored in the medium questioned.
References Cited (Backward Citations)
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