EP1217840A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System and method for embedding a watermark in digital image sequences
Assignee: Eastman Kodak Co
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Filing: 2001-12-03
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Granted: —
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Expires: 2021-12-03
Abstract
Abstract A method for embedding a watermark signal that contains message data in a digital image sequence having two or more frames, includes the steps of: producing a set of two or more different carrier signals from a single secure key; assigning a carrier signal from the set of carrier signals to each frame in the sequence; and embedding a watermark signal in each frame using the corresponding assigned carrier signal.
Inventors
- 👤 Paul W. Jones
- 👤 Chris W. Honsinger
- 👤 Majid Rabbani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:57
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/0085; H; H04; H04N; H04N19/00; H04N19/10; H04N19/169; H04N19/17; H04N19/172; H04N19/46; H04N19/467; G06T2201/00; G06T2201/005; G06T2201/0051; G06T2201/0061; G06T2201/0081
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A method for embedding a watermark signal that contains
message data in a digital image sequence having two or more frames, comprising
the steps of: a) producing a set of two or more different carrier signals from a
single secure key; b) assigning a carrier signal from the set of carrier signals to each
frame in the sequence; and c) embedding a watermark signal in each frame using the
corresponding carrier signal assigned in step (b).
Claim 2
Dependent Claim
66 words
The method claimed in claim 1, wherein the carrier signals are
random phase carrier images, and wherein the embedding step includes the steps
of: c1) creating a message image representing the message data; c2) convolving the message image with each carrier image to
produce a sequence of dispersed message images; and c3) combining the dispersed message images with the respective
frames of the digital image sequence.
Claim 3
Dependent Claim
24 words
The method claimed in claim 1, wherein the set of carrier
signals is produced by cyclically shifting the secure key for each carrier signal.
Claim 4
Dependent Claim
24 words
The method claimed in claim 2, wherein the random phase
carrier images are produced by cyclically shifting the secure key for each carrier
image.
Claim 5
Dependent Claim
50 words
The method claimed in claim 2, wherein the random phase
carrier images are produced by the steps of: a1) generating a large random phase carrier image; and a2) segmenting the large random phase carrier image into smaller
random phase carrier images to produce the set of random phase carrier images.
Claim 6
Dependent Claim
45 words
The method claimed in claim 2, wherein the random phase
carrier images are produced by the steps of: a1) generating an initial random phase carrier image; and a2) spatially transforming the initial random phase carrier image
to produce the set of random phase carrier images.
Claim 7
Dependent Claim
23 words
The method claimed in claim 1, further comprising the step of
extracting message data from at least one frame of the image sequence.
Claim 8
Dependent Claim
36 words
The method claimed in claim 7, wherein the message data is
extracted by producing a super carrier signal by summing the set of carrier signals
and using the super carrier signal to recover the message data.
Claim 9
Dependent Claim
24 words
The method claimed in claim 2, further comprising the step of
extracting the message image from at least one frame of the image sequence.
Claim 10
Dependent Claim
36 words
The method claimed in claim 9, wherein the message image is
extracted by producing a super carrier image by summing the set of carrier images
and correlating the super carrier image with the image sequence frame.
References Cited (Backward Citations)
No citation records indexed.
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