Patent EP0901282A2 successfully refreshed from Google Patents.
EP0901282A2
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EP
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Method and apparatus for recording and reproducing electronic watermark information, and recording medium
Assignee: Hitachi Ltd
•
Filing: 1998-08-14
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Granted: —
•
Expires: 2018-08-14
Abstract
Abstract At recording of a video signal, with electronic watermark information being embedded therein, on a recording medium, a reference signal which is formed differently from the watermark information is inserted to the video signal. At reproduction of the video signal, the luminance of the watermark information is modified based on the reference signal.
Inventors
- 👤 Hiroyuki Kimura
- 👤 Takao Arai
- 👤 Toshifumi Takeuchi
- 👤 Hiroshi 102 Berugureisu-miyazakidai Yoshiura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:44
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; G06T1/0085; G11B20/00086; G11B20/00884; G11B27/00; G11B27/10; H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G06T2201/00; G06T2201/005; G06T2201/0065; H04N2005/91307; H04N2005/91335
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
39 words
A recording medium having a record of a video signal,
electronic watermark information which is embedded in said
video signal and a reference signal which is inserted at a
position different from the position of said electronic
watermark information.
Claim 2
Dependent Claim
33 words
A recording medium according to claim 1, wherein said
electronic watermark information is derived from the luminance
signal, with the luminous value thereof being altered, at a
predetermined position of said video signal.
Claim 3
Dependent Claim
24 words
A recording medium according to claim 1, wherein said
reference signal is recorded by being inserted in the over-scan
area of said video signal.
Claim 4
Dependent Claim
28 words
A recording medium according to claim 1, wherein said
reference signal is recorded by being inserted in the blanking
period of a sync signal of said video signal.
Claim 5
Dependent Claim
20 words
A recording medium according to claim 1, wherein said
reference signal has an amplitude equal to the peak white level.
Claim 6
Dependent Claim
48 words
A recording medium according to claim 1, wherein said
reference signal consists of a first and second reference
signals, said first reference signal having an amplitude equal
to the peak white level, said second reference signal having
an amplitude smaller than the amplitude of said first reference
signal.
Claim 7
Dependent Claim
22 words
A recording medium according to claim 2, wherein the
alteration of luminance of said luminance signal is within a
permissible alteration range.
Claim 8
Independent Claim
47 words
A method of recording electronic watermark information
comprising the steps of: embedding electronic watermark information in a video
signal at a minimal disturbance against said video signal; and recording a reference signal which is inserted at a
position different from the position of said electronic
watermark information.
Claim 9
Dependent Claim
27 words
An electronic watermark information recording method
according to claim 8, wherein the insertion position of said
reference signal is in the over-scan area of said video signal.
Claim 10
Dependent Claim
27 words
An electronic watermark information recording method
according to claim 8, wherein the insertion position of said
reference signal is in the blanking period of a sync signal.
Claim 11
Dependent Claim
23 words
An electronic watermark information recording method
according to claim 8, wherein said reference signal has an
amplitude equal to the peak white level.
Claim 12
Dependent Claim
51 words
An electronic watermark information recording method
according to claim 8, wherein said reference signal consists
of a first and second reference signals, said first reference
signal having an amplitude equal to the peak white level, said
second reference signal having an amplitude smaller than the
amplitude of said first reference signal.
Claim 13
Independent Claim
64 words
A method of recording and reproducing electronic
watermark information comprising the steps of: embedding electronic watermark information in a video
signal at a minimal disturbance against said video signal; recording a reference signal which is inserted at a
position different from the position of said electronic
watermark information; and reproducing said reference signal and modifying said
electronic watermark information by using said reference
signal.
Claim 14
Dependent Claim
38 words
An electronic watermark information recording and
reproduction method according to claim 13, wherein said
electronic watermark information is derived from the luminance
signal, with the luminous value thereof being altered, at a
predetermined position of said video signal.
Claim 15
Dependent Claim
34 words
An electronic watermark information recording and
reproduction method according to claim 13, wherein said
modification step modifies the luminous value of said
electronic watermark information based on the luminous value
of said reference signal.
Claim 16
Independent Claim
48 words
A method of recording electronic watermark information
comprising the steps of: calculating the visually permissible alteration range of
the luminous value of the reference signal included in a video
signal; and altering the luminous value of the luminance signal at
a predetermined position within the calculated alteration
range.
Claim 17
Dependent Claim
28 words
An electronic watermark information recording method
according to claim 16 further including the step of inserting
a reference signal outside the picture display area of said
video signal.
Claim 18
Independent Claim
55 words
A method of recording electronic watermark information
comprising the steps of: calculating the visually permissible alteration range of
the luminous value of the reference signal included in a video
signal; and altering the luminous value of the luminance signal at
a predetermined position in case the altered luminous value
is within the calculated alteration range.
Claim 19
Dependent Claim
28 words
An electronic watermark information recording method
according to claim 18 further including the step of inserting
a reference signal outside the picture display area of said
video signal.
Claim 20
Independent Claim
80 words
A method of reproducing electronic watermark
information comprising the steps of: detecting a reference signal for detecting electronic
watermark information from a recording medium on which a video
signal, said electronic watermark information which is
embedded in said video signal at a minimal disturbance against
said video signal and said reference signal which is inserted
at a position different from the position of said electronic
watermark information are recorded; and modifying said electronic watermark information based on
said reference signal.
Claim 21
Independent Claim
94 words
A method of reproducing electronic watermark
information comprising the steps of: detecting a reference signal for detecting electronic
watermark information from a recording medium on which a video
signal, said electronic watermark information which is
embedded in said video signal by the alteration of the luminous
value of the luminance signal included in said video signal
and said reference signal which is inserted at a position
different from the position of embedment of said electronic
watermark information are recorded; and modifying the luminous value of said electronic watermark
information based on said reference signal.
Claim 22
Dependent Claim
53 words
An electronic watermark information reproduction
method according to claim 21 further including the steps of: calculating a gain drift based on said reference signal;
modifying the luminous value of said luminance signal
based on the calculated gain drift; and detecting said electronic watermark information from
said luminance signal having the modified luminous value.
Claim 23
Dependent Claim
49 words
An electronic watermark information reproduction
method according to claim 21 further including the steps of: calculating a gain drift based on said reference signal; detecting said electronic watermark information from
said luminance signal; and modifying the amplitude of the detected electronic
watermark information based on the calculated gain drift.
Claim 24
Independent Claim
65 words
A method of recording and reproducing electronic
watermark information comprising the steps of: recording a video signal, electronic watermark
information which is embedded in said video signal at a minimal
disturbance against said video signal and a reference signal
which is inserted at a position different from the position
of said electronic watermark information; and detecting said electronic watermark information based on
said reference signal.
Claim 25
Independent Claim
52 words
A method of recording electronic watermark information
comprising the step of: recording a video signal, electronic watermark
information which is embedded in said video signal at a minimal
disturbance against said video signal and a reference signal
which is inserted at a position different from the position
of said electronic watermark information.
Claim 26
Independent Claim
71 words
A method of reproducing electronic watermark
information comprising the step of: detecting electronic watermark information for
reproduction based on a reference signal from a recording
medium on which a video signal, said electronic watermark
information which is embedded in said video signal at a minimal
disturbance against said video signal and said reference signal
which is inserted at a position different from the position
of said electronic watermark information are recorded.
Claim 27
Independent Claim
68 words
An apparatus for recording electronic watermark
information comprising: a permissible alteration range detecting circuit which
calculates the alteration range of luminous value depending
on the luminous value of the luminance signal included in a
video signal; and an electronic watermark information embedment processing
circuit which embeds electronic watermark information by
altering the luminous value of the luminance signal at a
predetermined position within the calculated permissible
alteration range.
Claim 28
Dependent Claim
42 words
An electronic watermark information recording
apparatus according to claim 27 further including a reference
signal generator, and an adder which adds the reference signal
generated by said reference signal generator to said video
signal at a position outside the picture display area.
Claim 29
Independent Claim
75 words
An apparatus for recording electronic watermark
information comprising: a permissible alteration range detecting circuit which
calculates the alteration range of luminous value depending
on the luminous value of the luminance signal included in a
video signal; and an electronic watermark information embedment processing
circuit which embeds electronic watermark information by
altering the luminous value of the luminance signal at a
predetermined position in case the altered luminous value is
within the calculated permissible alteration range.
Claim 30
Dependent Claim
42 words
An electronic watermark information recording
apparatus according to claim 29 further including a reference
signal generator, and an adder which adds the reference signal
generated by said reference signal generator to said video
signal at a position outside the picture display area.
Claim 31
Dependent Claim
23 words
An electronic watermark information recording
apparatus according to claim 29, wherein said reference signal
has an amplitude equal to the peak white level.
Claim 32
Dependent Claim
51 words
An electronic watermark information recording
apparatus according to claim 29, wherein said reference signal
consists of a first and second reference signals, said first
reference signal having an amplitude equal to the peak white
level, said second reference signal having an amplitude smaller
than the amplitude of said first reference signal.
Claim 33
Independent Claim
71 words
An apparatus for reproducing electronic watermark
information comprising: detection means for detecting electronic watermark
information for reproduction based on a reference signal from
a recording medium on which a video signal, said electronic
watermark information which is embedded in said video signal
at a minimal disturbance against said video signal and said
reference signal which is inserted at a position different from
the position of said electronic watermark information are
recorded.
Claim 34
Dependent Claim
124 words
An electronic watermark information reproduction
apparatus according to claim 33, wherein said detection means
includes: a detection signal generating circuit which generates a
detection signal for detecting said reference signal from a
sync signal; a sample-holding circuit which samples and holds the
amplitude of said reference signal in response to said
detection signal; a gain drift calculating circuit which calculates the
gain drift based on the amplitude of said reference signal
provided by said sample-holding circuit; a modification circuit which modifies the luminance
signal included in said video signal based on the calculation
result provided by said gain drift calculating circuit; and an electronic watermark information detecting circuit
which detects said electronic watermark information from the
modified luminance signal by using said detection signal.
Claim 35
Dependent Claim
125 words
An electronic watermark information reproduction
apparatus according to claim 33, wherein said detection means
includes: a detection signal generating circuit which generates a
detection signal for detecting said reference signal from a
sync signal; a sample-holding circuit which samples and holds the
amplitude of said reference signal in response to said
detection signal; a gain drift calculating circuit which calculates the
gain drift based on the amplitude of said reference signal
provided by said sample-holding circuit; a detection circuit which detects said electronic
watermark information from the luminance signal included in
said video signal by using said detection signal; and a modification circuit which modifies the amplitude of
the detected electronic watermark information based on the gain
drift calculated by said gain drift calculating circuit.
Claim 36
Independent Claim
54 words
An apparatus for reproducing electronic watermark
information comprising: an electronic watermark information detecting circuit
which detects electronic watermark information from a video
signal; a reference signal detecting circuit which detects a
reference signal; and a modification circuit which modifies the amplitude of
said electronic watermark information based on the amplitude
of said reference signal.
Claim 37
Dependent Claim
30 words
An electronic watermark information reproduction
apparatus according to claim 36, wherein said modification
circuit includes a gain drift calculating circuit which
calculates the drop of gain of said reference signal.
Claim 38
Dependent Claim
38 words
An electronic watermark information reproduction
apparatus according to claim 36, wherein said electronic
watermark information detecting circuit includes an
electronic watermark position generating circuit which
generates an electronic watermark information position
detection signal based on a sync signal.
Claim 39
Dependent Claim
36 words
An electronic watermark information reproduction
apparatus according to claim 36, wherein said reference signal
detecting circuit includes a reference signal position
generating circuit which generates a reference signal position
detection signal based on a sync signal.
Claim 40
Dependent Claim
32 words
An electronic watermark information reproduction
apparatus according to claim 36, wherein said reference signal
detecting circuit includes a timing signal detecting circuit
which detects a timing signal included in said video signal.
Claim 41
Dependent Claim
52 words
A recording medium having a record of a video signal,
electronic watermark information which is embedded in said
video signal, a reference signal which is inserted at a position
different from the position of said electronic watermark
information and a timing signal which is included at the head
of said video signal.
References Cited (Backward Citations)
No citation records indexed.
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