EP1120741A2
Expired / Lapsed
EP
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Adaptive data embedding method for improved image quality
Assignee: Eastman Kodak Co
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Filing: 2001-01-15
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Granted: —
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Expires: 2021-01-15
Abstract
Abstract An improved method of embedding a message in a digital image, the method including the steps of generating a random phase carrier, convolving the message and the random phase carrier to form a dispersed message and adding the dispersed message to the digital image to form an image having an embedded hidden message, the improvement including the step of, modifying the amplitude of the dispersed message as a function of the lightness of the digital image prior to adding the dispersed message to the digital image.
Inventors
- 👤 Xin Wen
- 👤 Chris W. Honsinger
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:47
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/0028
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
An improved method of embedding a message in a digital
image, the method including the steps of generating a random phase carrier,
convolving the message and the random phase carrier to form a dispersed message
and adding the dispersed message to the digital image to form an image having an
embedded hidden message, the improvement comprising the step of: prior to
adding the dispersed message to the digital image, modifying the amplitude of the
dispersed message as a function of the lightness of the digital image.
Claim 2
Dependent Claim
37 words
The improved method claimed in claim 1 wherein the amplitude
of the dispersed message is decreased when the lightness is lower than a
predetermined threshold to reduce the visibility of the embedded message in the
digital image.
Claim 3
Dependent Claim
27 words
The improved method claimed in claim 2, wherein the
amplitude of the dispersed message is set to zero where the lightness is lower than
the predetermined threshold.
Claim 4
Dependent Claim
38 words
The improved method claimed in claim 1 wherein the amplitude
of the dispersed message is increased where the lightness of the image is above a
predetermined threshold to increase the signal to noise ratio of the embedded
message.
Claim 5
Dependent Claim
26 words
The improved method claimed in claim 1 wherein the lightness
of the dispersed message is the perceived lightness when the input image is
printed or displayed.
Claim 6
Dependent Claim
19 words
A computer storage medium having instructions stored thereon
for causing a computer to perform the method of claim 1.
References Cited (Backward Citations)
No citation records indexed.
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