EP0854633A2
Expired / Lapsed
EP
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Image data illegal use prevention system
Assignee: NEC Corp
•
Filing: 1998-01-15
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Granted: —
•
Expires: 2018-01-15
Abstract
Abstract An image data illegal use prevention system includes an image data fetching unit (6) for fetching digital image data in which electronic watermark data may be embedded, and an electronic watermark data detection unit (8) for detecting electronic watermark data from the image data fetched by the image data fetching unit (6). If electronic watermark data are detected by the electronic watermark data detection unit (8), then an image data recording unit (7) does not record the image data fetched by the image data fetching unit (6) onto a recording medium (9), thereby preventing illegal duplication. The electronic watermark data are calculated, for example, in accordance with an expression determined in advance for frequency components of discrete cosine transformed digital image data.
Inventors
- 👤 Toshiyuki Ishino
- 👤 Shinobu Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 05:31
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00838; H04N1/0084; H04N1/00843; H04N1/00846; H04N21/00; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; G; G06; G06T; G06T1/00; G06T1/0021; H04N1/00832; H04N1/00856; H04N1/00875; H04N1/00912; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32154; H04N1/32165; H04N1/32267; H04N1/32277; H04N1/40; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3235; H04N2201/3269; H04N2201/327
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
An image data illegal use prevention system,
characterized in that it comprises: image data fetching means (6; 16; 26; 41; 51)
for fetching digital image data in which electronic
watermark data may be embedded; electronic watermark data detection means (8;
18; 28; 43; 53) for detecting electronic watermark data
from the image data fetched by said image data fetching
means (6; 16; 26; 41; 51); and transfer inhibition means (7; 17; 27; 42; 52)
for inhibiting, if electronic watermark data are
detected by said electronic watermark data detection
means (8; 18; 28; 43; 53), transfer of the image data
fetched by said image data fetching means (1; 11; 21;
31; 61) to a transfer destination (9; 19; 29; 44; 54).
Claim 2
Dependent Claim
121 words
An image data illegal use prevention system,
characterized in that it comprises; image data fetching means (6; 16; 26; 41; 51)
for fetching digital image data in which electronic
watermark data may be embedded; electronic watermark data detection means (8;
18; 28; 43; 53) for detecting electronic watermark data
from the image data fetched by said image data fetching
means (6; 16; 26; 41; 51); and transfer means (7; 17; 27; 42; 52) for
transferring, if electronic water mark data are detected
by said electronic watermark data detection means (8;
18; 28; 43; 53), data different from the image data
fetched by said image data fetching means (1; 11; 21;
31; 61) to a transfer destination (9; 19; 29; 44; 54).
Claim 3
Dependent Claim
51 words
An image data illegal use inhibition system
as set forth in claim 2, characterized in that the
different data are data obtained by superposing data
obtained by multiplying the electronic watermark data by
a constant on the image data fetched by said image data
fetching means (6; 16; 26; 41; 51).
Claim 4
Dependent Claim
97 words
An image data illegal use prevention system,
characterized in that it comprises: image data fetching means (66) for fetching
digital image data in which electronic watermark data
may be embedded; electronic watermark data detection means (64)
for detecting the electronic watermark data from the
image data fetched by said image data fetching means
(66); and transfer inhibition means (63) for
discriminating whether the detected electronic watermark
data indicate transfer permission or inhibition and
inhibiting, when the detected electronic water mark data
indicate transfer inhibition, a transferring operation
of the fetched image data to a transfer destination
(67).
Claim 5
Dependent Claim
53 words
An image data illegal use inhibition system
as set forth in claim 4, characterized in that said
transfer inhibition means (63) discriminates, when the
detected electronic watermark data include a value
representing that the transfer permission time number is
zero, that the detected electronic watermark data are
electronic watermark data indicating transfer
inhibition.
Claim 6
Dependent Claim
102 words
An image data illegal use inhibition system,
characterized in that it comprises: image data fetching means (66) for fetching
digital image data in which electronic watermark data
including a value indicating that the transfer
permission time number is m may be embedded; watermark data embedding means (64) for
embedding, into the fetched image data, new electronic
watermark data which includes a value indicating that
the transfer permission time number is smaller by one
than the preceding value of m; and transfer means (63) for transferring the image
data in which the new electronic watermark data are
embedded to a transfer destination (67).
Claim 7
Dependent Claim
46 words
An image data illegal use inhibition system
as set forth in any one of claims 1 to 6, characterized
in that the electronic watermark data are calculated in
accordance with a predetermined expression using
frequency components of the digital image data obtained
by discrete cosine transform.
Claim 8
Dependent Claim
85 words
An image data illegal use inhibition system
as set forth in any one of claims 1 to 7, characterized
in that said image data fetching means (6; 16; 26; 41;
51; 66) fetches digital image data from a recording
medium (5; 15; 25; 35; 69) on which the digital image
data are recorded, and the transfer destination is a
recording medium (9; 19; 29; 44; 54, 70) different from
the recording medium (5; 15; 25; 35; 69) on which the
digital image data are recorded.
References Cited (Backward Citations)
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