EP0903736A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Recording/reproducing method and apparatus, processing apparatus, and recording medium for video signal having copy control information
Assignee: Hitachi Ltd
•
Filing: 1998-09-08
•
Granted: —
•
Expires: 2018-09-08
Abstract
Abstract Electronic watermark information obtained by changing a luminance value of a luminance signal in a video signal and a copy generation management signal (CGMS signal) inserted into an area out of a scan region of the video signal are recorded into a recording medium. A reproducing apparatus comprises an electronic watermark information detecting circuit, a CGMS signal detecting circuit, a control circuit to which detected electronic watermark information and CGMS signal are supplied, and a video signal processing circuit controlled by an output of the control circuit. When the electronic watermark information and the CGMS signal have a rational relation, the video signal processing circuit is controlled to output the video signal.
Inventors
- 👤 Hiroyuki Kimura
- 👤 Takao Arai
- 👤 Toshifumi Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:13
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/0028; G11; G11B; G11B20/00; G11B20/00007; G11B20/00086; G11B20/00731; G11B20/00746; G11B20/00753; G11B20/00768; G11B20/00884; G11B20/10; G11B20/10527; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; G11B2020/10537; H04N2005/91307; H04N2005/91328; H04N2005/91335
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
37 words
A recording medium in which a video signal, electronic
watermark information which is embedded in said video signal
and has copy control information, and a CGMS signal for copy
control inserted in said video signal are recorded.
Claim 2
Dependent Claim
30 words
A recording medium according to claim 1, said
electronic watermark information is obtained by changing a
luminance value of a luminance signal in a predetermined
position of said video signal.
Claim 3
Dependent Claim
21 words
A recording medium according to claim 2, wherein the
luminance value of said luminance signal lies within a
permissible alteration range.
Claim 4
Dependent Claim
25 words
A recording medium according to claim 1, wherein said
CGMS signal is inserted into a region out of a scan region of
said video signal.
Claim 5
Dependent Claim
26 words
A recording medium according to claim 1, wherein said
CGMS signal is inserted into a region out of a scan region near
a horizontal sync signal.
Claim 6
Dependent Claim
19 words
A recording medium according to claim 1, wherein said
CGMS signal is a signal of two or larger bits.
Claim 7
Dependent Claim
22 words
A recording medium according to claim 1, wherein said
electronic watermark information has information of either
copy free, copy-once-permission, or copy inhibition.
Claim 8
Dependent Claim
21 words
A recording medium according to claim 1, wherein said
CGMS signal has information of either copy free, copy-once-permission,
or copy inhibition.
Claim 9
Independent Claim
66 words
A method of recording a video signal, comprising the
steps of: forming electronic watermark information by embedding
copy control information by changing a luminance value in a
predetermined position of a luminance signal; inserting a CGMS signal having copy control information
into a region out of a scan region of the video signal; and recording said electronic watermark information, said
CGMS signal, and said video signal.
Claim 10
Dependent Claim
18 words
A method according to claim 9, wherein said CGMS signal
is a signal of two or larger bits.
Claim 11
Independent Claim
75 words
A method of recording copy control information,
comprising the steps of: calculating a visually durable range even when a
luminance value of a luminance signal included in a video signal
is changed; forming electronic watermark information having copy
control information by changing the luminance value of a
luminance signal in a predetermined position within said
calculated range; and generating a CGMS signal inserted into a region out of
a scan region of the video signal.
Claim 12
Dependent Claim
18 words
A method according to claim 11, wherein said CGMS
signal is a signal of two or larger bits.
Claim 13
Dependent Claim
25 words
A method according to claim 11, wherein said CGMS
signal is inserted into a region out of a scan region near a
horizontal sync signal.
Claim 14
Independent Claim
90 words
A method of recording copy control information,
comprising the steps of: calculating a visually durable range even if a luminance
value of a luminance signal included in a video signal is
changed; generating electronic watermark information having copy
control information by changing said luminance value when the
luminance value to be changed of the luminance signal in a
predetermined position is within said calculated range; and generating a CGMS signal which has copy control
information and is inserted into a region out of a scan region
of the video signal.
Claim 15
Dependent Claim
35 words
A method according to claim 14, wherein said CGMS
signal is a signal of two or larger bits and is inserted into
a region near a horizontal sync signal and outside of a scan
region.
Claim 16
Independent Claim
121 words
A method of reproducing a video signal having copy
control information for reproducing electronic watermark
information and a CGMS signal from a video signal including
said electronic watermark information in which copy control
information is embedded by changing a luminance value of a
luminance signal and the CGMS signal having copy control
information inserted into a region out of a scan region of the
video signal in order to control outputting of the video signal,
the method comprising the steps of: detecting said electronic watermark information; detecting said CGMS signal; and stopping outputting of said video signal when the copy
control information obtained from said electronic watermark
information and the copy control information obtained from said
CGMS signal lacks in rationality.
Claim 17
Dependent Claim
26 words
A method according to claim 16, wherein each of said
electronic watermark signal and said CGMS signal has either
copy inhibition information or copy-once permission
information.
Claim 18
Dependent Claim
38 words
A method according to claim 17, further comprising
a step of outputting and displaying said video signal by the
copy-once permission information obtained from said
electronic watermark information and the copy inhibition
information obtained from said CGMS signal.
Claim 19
Dependent Claim
36 words
A method according to claim 17, further comprising
a step of outputting and displaying said video signal by copy
inhibition information obtained from said electronic
watermark information and copy inhibition information
obtained from said CGMS signal.
Claim 20
Dependent Claim
21 words
A method according to claim 16, wherein when said CGMS
signal is not reproduced, outputting of said video signal is
stopped.
Claim 21
Independent Claim
140 words
A method of reproducing a video signal having copy
control information for reproducing, from a disk, electronic
watermark information and a CGMS signal from a video signal
including said electronic watermark information in which
information of either copy inhibition or copy-once permission
is embedded by changing a luminance value of a luminance signal
and the CGMS signal which is inserted into a region out of a
scan region of the video signal and has information of either
copy inhibition or copy-once permission in order to control
outputting said video signal, comprising the steps of: detecting said electronic watermark information; detecting said CGMS signal; discriminating the kind of said disk; and stopping outputting of said video signal when the copy
control information obtained from said electronic watermark
information and the copy control information obtained from said
CGMS signal lacks in rationality.
Claim 22
Dependent Claim
41 words
A method according to claim 21, further comprising
a step of outputting said video signal when said disk is a read
only disk, said electronic watermark information is a signal
of copy-once-permission, and said CGMS signal is a signal of
record-once-permission.
Claim 23
Dependent Claim
46 words
A method according to claim 21, further comprising
a step of stopping the outputting of said video signal when
said disk is a recordable disk, said electronic watermark
information is a signal of copy- once- permission, and said
CGMS signal is a signal of record- once-permission.
Claim 24
Independent Claim
151 words
A method of reproducing a video signal having copy
control information for reproducing, from a recording medium,
electronic watermark information and a CGMS signal from a video
signal including said electronic watermark information in
which information of either copy inhibition or copy-once-permission
is embedded by changing a luminance value of a
luminance signal and the CGMS signal which is inserted into
a region out of a scan region of the video signal and has
information of either copy inhibition or copy-once-permission
in order to control outputting of said video signal, the method
comprising the steps of: detecting copy control information embedded in said
electronic watermark information; detecting the copy control information from said CGMS
signal; discriminating whether the copy information embedded in
said electronic watermark information and that in the CGMS
signal has a rational relation or not; and permitting recording of said video signal only when the
relation is rational.
Claim 25
Dependent Claim
47 words
A reproduction method according to claim 24, wherein
the step for discriminating said rational relation
discriminates the relation as rational from a state where
copy-once-permission information obtained from said
electronic watermark information and copy- once-permission
information obtained from said CGMS signal is rewritten to copy
inhibition information.
Claim 26
Dependent Claim
53 words
A method according to claim 24, wherein the step of
discriminating said rational relation discriminates the
relation as rational from a state where copy- once- permission
information obtained from said electronic watermark
information is rewritten to copy inhibition information and
copy-once-permission information obtained from said CGMS
signal is rewritten to copy inhibition information.
Claim 27
Independent Claim
112 words
An apparatus for recording copy control information,
comprising: a permissible alteration range calculating circuit for
calculating an alternation range of a luminance value of a
luminance signal included in a video signal in accordance with
said luminance value; an information embedment processing circuit for
embedding electronic watermark information having copy
control information by changing the luminance value of the
luminance signal in a predetermined position within said
calculated permissible alternation range; a generating circuit for generating a CGMS signal having
copy control information; and an adding circuit for adding said CGMS signal to a region
out of a scan region of the luminance signal in which said
electronic watermark information is embedded.
Claim 28
Dependent Claim
23 words
An apparatus according to claim 27, wherein said
generating circuit generates the CGMS signal constructed by
a signal of two or larger bits.
Claim 29
Independent Claim
121 words
An apparatus for recording copy control information,
comprising: a permissible alteration range calculating circuit for
calculating an alternation range of a luminance value of a
luminance signal included in a video signal in accordance with
said luminance value; an information embedment processing circuit for
embedding electronic watermark information having copy
control information by changing the luminance value of said
luminance signal when the luminance value of the luminance
signal in a predetermined position is within said calculated
variable range; a generating circuit for generating a CGMS signal having
copy control information; and an adding circuit for adding said CGMS signal to a region
out of a scan region range of said luminance signal in which
said electronic watermark information is embedded.
Claim 30
Dependent Claim
23 words
An apparatus according to claim 29, wherein said
generating circuit generates a CGMS signal constructed by a
signal of two or larger bits.
Claim 31
Independent Claim
132 words
An apparatus for processing a video signal having copy
control information for reproducing from a recording medium
electronic watermark information and a CGMS signal from a video
signal including said electronic watermark information in
which copy control information is embedded by changing a
luminance value of a luminance signal and the CGMS signal having
copy control information inserted into a region out of a scan
region of the video signal in order to control outputting of
the video signal, the apparatus comprising: a circuit for processing said video signal reproduced
from said recording medium; an electronic watermark detecting circuit; a CGMS signal detecting circuit for detecting said CGMS
signal; and an output control circuit for controlling said video
signal processing circuit from said detected electronic
watermark information and said detected CGMS signal.
Claim 32
Independent Claim
170 words
An apparatus for processing a video signal having copy
control information for reproducing from a recording medium
electronic watermark information and a CGMS signal from a video
signal which includes said electronic watermark information
in which information of copy inhibition or copy-once-permission
is embedded by changing a luminance value of a
luminance signal and the CGMS signal which is inserted in a
region out of a scan region of the video signal and has
information of either copy inhibition or copy-once-permission
in order to control outputting of the video signal, the
apparatus comprising: a video signal processing circuit for processing said
video signal read from said recording medium; an electronic watermark information detecting circuit
for detecting said electronic watermark information; a CGMS signal detecting circuit for detecting said CGMS
signal; and an output control circuit for receiving an output of said
electronic watermark information detecting circuit and an
output of said CGMS signal detecting circuit and on/off
controlling the outputting of the video signal of said video
signal processing circuit.
Claim 33
Dependent Claim
42 words
An apparatus according to claim 32, wherein said
output control circuit controls said video signal processing
circuit so as to output a video signal by copy-once-permission
information obtained from said electronic watermark
information and copy inhibition information obtained from said
CGMS signal.
Claim 34
Dependent Claim
43 words
An apparatus according to claim 32, wherein said
output control circuit controls said video signal processing
circuit so as to output said video signal by copy inhibition
information obtained from said electronic watermark
information and copy inhibition information obtained from said
CGMS signal.
Claim 35
Dependent Claim
32 words
An apparatus according to claim 32, wherein said
output control circuit controls said video signal processing
circuit so as not to output said video signal when said CGMS
signal is not detected.
Claim 36
Dependent Claim
51 words
An apparatus according to claim 32, wherein when said
recording medium is a recordable medium, said output control
circuit controls said video signal processing circuit so as
not to output said video signal by copy-once-permission
information obtained from said electronic watermark
information and copy- once-permission information obtained
from said CGMS signal.
Claim 37
Dependent Claim
52 words
An apparatus according to claim 32, wherein when said
recording medium is a read only medium, said output control
circuit controls said video signal processing circuit so as
to output said video signal by copy-once-permission
information obtained from said electronic watermark
information and copy- once- permission information obtained
from said CGMS signal.
Claim 38
Independent Claim
150 words
An apparatus for processing a video signal having copy
control information for reproducing from a recording medium
electronic watermark information and a CGMS signal from a video
signal which includes said electronic watermark information
in which copy control information is embedded by changing a
luminance value of a luminance signal and said CGMS signal
having copy control information inserted into a region out of
a scan region of the video signal in order to control outputting
of said video signal, comprising: a circuit for processing said video signal reproduced
from said recording medium;
an electronic watermark information detecting circuit
for detecting said electronic watermark information;
a CGMS signal detecting circuit for detecting said CGMS
signal;
an output control circuit for controlling said video
signal processing circuit on the basis of said detected
electronic watermark information and said detected CGMS
signal; and
a circuit for discriminating the kind of a disk.
Claim 39
Dependent Claim
61 words
An apparatus according to claim 38, wherein when an
output of said disk kind discriminating circuit is a signal
indicative of a recordable disk, said output control circuit
controls said video signal processing circuit so as not to
output said video signal by copy- once-permission information
obtained from said electronic watermark information and copy-once-
permission information obtained from said CGMS signal.
Claim 40
Dependent Claim
61 words
An apparatus according to claim 38, wherein when an
output of said disk kind discriminating circuit is a signal
indicative of a read only disk, said output control circuit
controls said video signal processing circuit so as to output
said video signal by copy- once- permission information
obtained from said electronic watermark information and
copy-once-permission information obtained from said CGMS
signal.
Claim 41
Independent Claim
181 words
An apparatus for processing a video signal having copy
control information for reproducing from a recording medium
electronic watermark information and a CGMS signal from a video
signal which includes said electronic watermark information
in which information of either copy inhibition or copy-once-permission
is embedded by changing a luminance value of
a luminance signal and said CGMS signal which is inserted into
a region out of a scan region of the video signal in order to
control outputting of the video signal, the apparatus
comprising: a processing circuit for processing said video signal
read from said recording medium; a circuit for detecting said electronic watermark
information; a circuit for detecting said CGMS signal; a circuit for updating the generation of said detected
CGMS signal; and a rewriting and controlling circuit to which outputs of
said electronic watermark information detecting circuit, said
copy generation updating circuit, and said video signal
processing circuit are supplied, rewrites the copy generation,
and controls outputting of said video signal, wherein outputting of said video signal is controlled by
said electronic watermark signal and said CGMS signal.
Claim 42
Dependent Claim
58 words
An apparatus according to claim 41, wherein said
rewriting and controlling circuit allows said video signal to
be outputted from said rewriting and controlling circuit by
copy-once-permission information derived from said electronic
watermark information and copy-once-permission information
derived from said CGMS signal and allows the copy-once-permission
information of said CGMS signal to be rewritten to
copy inhibition information.
Claim 43
Dependent Claim
73 words
An apparatus according to claim 41, wherein said
rewriting and controlling circuit allows said video signal to
be outputted from said rewriting and controlling circuit by
copy-once-permission information derived from said electronic
watermark information and copy-once-permission information
derived from said CGMS signal and allows the copy-once-permission
information obtained from said electronic
watermark information to be rewritten to copy inhibition and
the copy- once- permission information of said CGMS signal to
copy inhibition information.
Claim 44
Dependent Claim
88 words
A recording and reproducing apparatus comprising
means for comparing a signal generated by a bit generating means
directly detected when a video signal is reproduced with a
detected signal from electronic watermark information
embedded in said video signal and outputting the video signal
only when the signals have a predetermined relation in order
to process said video signal having copy control information
formed by said bit generating means for copy control and means
for embedding a control signal as electronic watermark
information generated by said bit generating means.
Claim 45
Dependent Claim
62 words
An apparatus according to claim 44, further
comprising: means for detecting said electronic watermark
information and changing the signal generated by said bit
generating means only when the directly detected signal
generated by said bit generating means shows copy-once-permission;
and means for simultaneously recording said changed signal,
said inputted electronic watermark recording signal and an
image signal and inhibiting recording after that.
Claim 46
Dependent Claim
47 words
An apparatus according to claim 45, wherein only when
the signal generated by said bit generating means shows
copy-once-permission, the signal is rewritten to a signal of
recording inhibition, and the rewritten signal is
simultaneously recorded with said inputted electronic
watermark recording signal and said video signal.
Claim 47
Dependent Claim
99 words
A reproducing apparatus for reproducing a video
signal from a disk on which a video signal in which electronic
watermark information is recorded and bit generating means for
copy control are written, comprising: electronic watermark information detecting means; means for detecting a signal recorded by the bit
generating means; disk discriminating means for discriminating said disk;
and means for reproducing said video signal written in said
disk when said disk is discriminated as read only disk by said
disk discriminating means and said electronic watermark
information and the information generated by said bit
generating means coincide with each other.
Claim 48
Dependent Claim
106 words
A reproducing apparatus for reproducing a video
signal from a disk on which a video signal in which electronic
watermark information is recorded and bit generating means for
copy control are written, comprising: electronic watermark information detecting means; means for detecting a signal recorded by the bit
generating means; disk discriminating means for discriminating said disk;
and means for reproducing said video signal when said disk
is discriminated as a recordable and reproducible disk by said
disk discriminating means, said electronic watermark
information and said bit generating means coincide with each
other, and copy-once-permission of the signal generated by said
bit generating means is correctly changed.
Claim 49
Dependent Claim
40 words
An apparatus according to claim 48, further
comprising means for performing reproduction only when said
disk is recordable and reproducible, said electronic watermark
information is one generation copy permitted information, and
information of said bit generating means is copy inhibition.
Claim 50
Dependent Claim
17 words
An apparatus according to claim 48, wherein said bit
generating means is multiplexed on said video signal.
References Cited (Backward Citations)
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