Patent EP0851397A2 successfully refreshed from Google Patents.
EP0851397A2
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EP
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Card type recording medium, certifying method and apparatus for the recording medium, forming system for recording medium, enciphering system, decoder therefor, and recording medium
Assignee: NEC Corp
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Filing: 1997-11-19
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Granted: —
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Expires: 2017-11-19
Abstract
Abstract In a card type recording medium containing a data area where data containing ID information of a holder are recorded, and an image area where image data are recorded, in the image area are recorded second image data which are generated by transforming first image data specifying the holder to frequency-area data, adding the transformed frequency-area data with the ID information and inversely transforming the added data to image signals. <IMAGE>
Inventors
- 👤 Kazuhito Takai
- 👤 Shiro Fujihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:58
CPC Classifications
G; G06; G06K; G06K19/00; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07F7/1008; G06K17/00; G06K19/06; G06K19/067; G06K19/07; G06K19/073; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/341; G06Q20/38; G06Q20/40; G06Q20/401; G06Q20/4014; G06Q20/40145; G07C; G07C9/00; G07C9/20; G07C9/22; G07C9/25; G07C9/253; G07C9/257; G07F7/0866
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
71 words
A card type recording medium comprising: a data area where data containing ID information of
a holder are recorded; and an image area where image data are recorded; wherein contents in the image area are recorded
second image data which are generated by transforming
first image data specifying the holder to frequency-area
data, adding the transformed frequency-area data with the
ID information and inversely transforming the added data
to image signals.
Claim 2
Dependent Claim
21 words
The card type recording medium as claimed in claim
1, wherein the conversion processing to the frequency-area
data is Fourier transform.
Claim 3
Dependent Claim
37 words
The card type recording medium as claimed in claim
1, wherein the conversion processing to the frequency-area
data is discrete cosine transform which is
performed on each of blocks into which the first image
data are divided.
Claim 4
Dependent Claim
77 words
A card type recording medium comprising: a data area where data containing ID information
inherent to a holder are recorded; and an image area where image data are recorded, wherein
said image area are recorded second image data which are
generated by transforming first image data specifying the
holder to frequency-area data, adding the transformed
frequency-area data with data obtained by transforming
the ID information to frequency-area information, and
inversely transforming the added data to image signals.
Claim 5
Dependent Claim
25 words
The recording medium as claimed in any one of claims 1 to 4, wherein the ID information of the data area are
enciphered and recorded.
Claim 6
Independent Claim
24 words
The medium as claimed in any one of claims 1 to 5, wherein the first image data is a fingerprint image
of the holder.
Claim 7
Independent Claim
25 words
The medium as claimed in any one of claims 1 to 5, wherein the first image data is a face photograph
image of the holder.
Claim 8
Independent Claim
198 words
A method of certifying a card type recording medium
which contains a data area where data containing ID
information of a holder are recorded, and an image area
where image data are recorded, in the image area being
recorded second image data which are generated by
transforming first image data specifying the holder to
frequency-area data, adding the transformed frequency-area
data with the ID information and inversely
transforming the added data to image signals,
comprising: a first step for restoring the ID information
from said card type recording medium and reading data of
the image area; a second step for transforming the image-area
data to the frequency-area data to generate first
transformed image data; a third step for gaining the same data as the
first image data from a reading target other than said
recording medium and transforming the image data thus
gained to the frequency-area data to obtain second
transformed image data; and a fourth step for subtracting the second
transformed image data from the first transformed image
data to obtain differential data, and comparing the
differential data with the ID information restored from
said card type recording medium to judge whether said
recording medium is justifiable.
Claim 9
Dependent Claim
18 words
The method as claimed in claim 8 , wherein the
conversion to the frequency-area data is Fourier
transform.
Claim 10
Dependent Claim
35 words
The method as claimed in claim 8 , wherein the
conversion to the frequency-area data is discrete cosine
transform which is performed on each of plural blocks
into which the first image data are divided.
Claim 11
Dependent Claim
46 words
The method as claimed in claim 8, 9 or 10, wherein said
fourth step compares the differential data obtained
every block with the ID information restored from said
card type recording medium to perform the judgment on
the basis of majority voting of the comparison result.
Claim 12
Independent Claim
210 words
An apparatus for certifying a card type recording
medium which contains a data area where data containing
ID information of a holder are recorded, and an image
area where image data are recorded, in the image area
being recorded second image data which are generated by
transforming first image data specifying the holder to
frequency-area data, adding the transformed frequency-area
data with the ID information and inversely
transforming the added data to image signals,
comprising: an ID information reader for restoring the ID
information from said card type recording medium; an image reader of reading the image-area
data; a conversion unit for transforming the image-area
data to the frequency-area data to generate first
transformed image data; a second image reader for reading the same
image data as the first image data from a reading target
other than said recording medium; a second conversion unit for transforming the
image data thus obtained to the frequency-area data to
obtain second transformed image data; a subtracter for subtracting the second
transformed image data from the first transformed image
data to obtain differential data; and a judgment circuit for comparing the
differential data with the ID information restored from
said card type recording medium to judge whether said
card type recording medium is justifiable.
Claim 13
Dependent Claim
166 words
A card type recording medium enciphering system
including enciphering means for enciphering ID
information to be recorded on a magnetic card, and
magnetic information forming means for recording the
enciphered ID information as magnetic information on
said magnetic card, comprising: frequency domain transformation means for
transforming an original image pattern of a pattern of
said magnetic card; adding means for transforming ID information
to be recorded on said magnetic card to transformation
information in which the ID information is distributed
on a frequency domain, and adding the transformation
information with the information which is generated by
the transformation of said frequency domain
transformation means; frequency domain inverse transformation means
for restoring the information of the frequency domain
generated by the addition of said adding means to a two-dimensional
image pattern; and image pattern print means for printing the
image pattern generated by said frequency domain inverse
transformation means on said magnetic card so that the
image pattern is used as the pattern of said magnetic
card.
Claim 14
Dependent Claim
73 words
The card type recording medium enciphering system
as claimed in claim 13 , further adding means for
generating an ID information frequency spectrum so that
the ID information frequency spectrum is similar to the
distribution state of the original image frequency
spectrum which is the information of the frequency
domain generated by the transformation of said frequency
domain transformation means, and adding the original
image frequency spectrum and the ID information
frequency spectrum.
Claim 15
Dependent Claim
32 words
The card type recording medium enciphering system
as claimed in claim 13 or 14, wherein said frequency domain
transformation means performs FFT, and said frequency
domain inverse transformation means performs inverse
FFT.
Claim 16
Dependent Claim
32 words
The card type recording medium enciphering system
as claimed in claim 13 or 14, wherein said frequency domain
transformation means performs DCT, and said frequency
domain inverse transformation means performs inverse
DCT.
Claim 17
Dependent Claim
137 words
A card type recording medium decoder for a recording
medium on which enciphered ID information and an image
pattern containing ID information are printed,
comprising: a magnetic reader for reading the enciphered
ID information from a magnetic stripe of said recording
medium; frequency domain transformation means for
transforming the pattern of said magnetic card to
frequency domain information by a magnetic head; deciphering means for deciphering the
enciphered ID information and outputting ID information; image reading means for reading the image
pattern; frequency domain transformation means for
transforming the image pattern to frequency domain; a subtracter for subtracting from the
frequency domain data frequency domain information to
which the ID information is transformed; and frequency domain inverse transformation means
for restoring the frequency domain information generated
by the subtraction of said subtracter to a two-dimensional
image pattern.
Claim 18
Dependent Claim
65 words
A card type recording medium in which specific data
for specifying a holder are written, comprising: identification data generated on the basis of the
specific data which are embedded into spatial frequency
data of a photograph; and the spatial frequency data embedded with the
identification data which are inversely transformed to
time data to generate image data and further record the
image data thus generated.
Claim 19
Dependent Claim
36 words
The card type recording medium as claimed in
claim 18 , wherein the spatial frequency data is a
photograph image which is subjected to discrete cosine
transform, and the inverse transformation is inverse
discrete cosine transform.
Claim 20
Dependent Claim
74 words
The card type recording medium as claimed in claim 18 or
19 , wherein the spatial frequency data embedded with the
identification data are generated by multiplying each
component of the spatial frequency data of the
photograph data and the component corresponding to the
identification data, then multiplying the multiplication
result and a constant value, and then adding the
constant-multiplied value to the component corresponding
to the spatial frequency data of the identification
data.
Claim 21
Dependent Claim
21 words
The medium as claimed in claim 18, 19 or 20, wherein the specific data are written in a magnetic
recording medium.
Claim 22
Independent Claim
28 words
The medium as claimed in any one of claims 18 to 21, wherein said card type recording medium is used as
an ID card or a credit card.
Claim 23
Dependent Claim
111 words
A card type recording medium forming system
comprising: means for generating identification data on
the basis of specific data for specifying a holder; means for transforming a photograph to be
attached onto said card to spatial frequency data; means for multiplying each component of the spatial
frequency data and the component corresponding to the
identification data, and adding a value obtained by
multiplying the multiplication value and a constant to
the component corresponding to the spatial frequency
data of the photograph data, and then inversely
transforming the added spatial frequency data to image
data; and means for writing the image data and the
specific data on said card type recording medium.
Claim 24
Dependent Claim
26 words
The card type recording medium as claimed in claim
23, wherein the transformation is discrete cosine
transform, and the inverse transform is inverse discrete
cosine transform.
Claim 25
Dependent Claim
131 words
A card type recording medium certifying device for
certifying a card type recording medium in which
identification data generated on the basis of the
specific data are embedded into spatial frequency data
of a photograph, then the spatial frequency data
embedded with the identification data are inversely
transformed to time data to generate image data, and
then the image data are recorded together with the
specific data, comprising: means for generating the identification data
on the basis of the specific data; transformation means for transforming the
image data to the spatial frequency data; and means for performing a correlation
calculation between the output of said transformation
means and the identification data and judging on the
basis of the correlation calculation result whether the
card type recording medium is true or not.
Claim 26
Dependent Claim
125 words
A recording medium for storing a program for
operating a card type recording medium forming system in
a computer, wherein said program contains: a step of generating identification data on
the basis of specific data specifying a holder; a step of transforming a photograph to be
attached to spatial frequency data; a step of multiplying each component of the
spatial frequency data and the component corresponding
to the identification data, and adding a value obtained
by multiplying the multiplication value and a constant
to the component corresponding to the spatial frequency
data of the photograph image, and inversely transforming
the added spatial frequency data to image data; and a step of writing the image data and the
specific data on the card type recording medium.
Claim 27
Dependent Claim
24 words
The recording medium as claimed in claim 26, wherein
the transformation is discrete cosine transform, and the
inverse transformation is inverse discrete cosine
transform.
Claim 28
Dependent Claim
140 words
A recording medium for storing a program for
operating in a computer a checking system for a card
type recording medium in which identification data
generated on the basis of the specific data are embedded
into spatial frequency data of a photograph, then the
spatial frequency data embedded with the identification
data are inversely transformed to time data to generate
image data, and then the image data are recorded
together with the specific data, comprising: a step of generating the identification data
on the basis of the specific data; a step of transforming the image data to the
spatial frequency data; and a step of performing a correlation
calculation between the output of said transformation
means and the identification data and judging on the
basis of the correlation calculation result whether the
card type recording medium is true or not.
References Cited (Backward Citations)
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