Card recording medium, certifying method and apparatus for the recording medium, forming system for recording medium, enciphering system, decoder therefor, and recording medium

• US 6,024,287 A
• Filed: 11/20/1997
• Issued: 02/15/2000
• Est. Priority Date: 11/28/1996
• Status: Expired due to Term

• Current Assignee: NEC Personal Computers, Ltd.
• Original Assignee: NEC Corporation
• Inventors: Takai, Kazuhito, Fujihara, Shiro
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US08/975,057
• Time in Patent Office: 817 Days
• Field of Search: 235/493, 235/487, 235/494, 235/462.25, 235/375, 235/376, 340/825.34, 382/124, 382/118
• US Class Current: 235/493
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/40145 Biometric identity checks
• CPC Class Codes: G07C 9/253 visually
• CPC Class Codes: G07C 9/257 electronically G07C9/26 takes precedence
• CPC Class Codes: G07F 7/0866 by active credit-cards adapted therefor G07F7/1008 takes precedence
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system

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.

Claims

1. A card 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.

2. The card recording medium as claimed in claim 1, wherein the ID information of the data area is enciphered and recorded.

3. The card recording medium as claimed in claim 1, wherein the first image data is a fingerprint image of the holder.

4. The card recording medium as claimed in claim 1, wherein the first image data is a face photograph image of the holder.

5. The card recording medium as claimed in claim 2, wherein the first image data is a fingerprint image of the holder.

6. The card recording medium as claimed in claim 2, wherein the first image data is a face photograph image of the holder.

7. The card recording medium as claimed in claim 1, wherein the conversion processing to the frequency-area data is Fourier transform.

8. The card recording medium as claimed in claim 2, wherein the conversion processing to the frequency-area data is Fourier transform.

9. The card recording medium as claimed in claim 5, wherein the conversion processing to the frequency-area data is Fourier transform.

10. The card recording medium as claimed in claim 6, wherein the conversion processing to the frequency-area data is Fourier transform.

11. The card 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.

12. The card recording medium as claimed in claim 2, 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.

13. The card recording medium as claimed in claim 5, 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.

14. The card recording medium as claimed in claim 6, 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.

15. A method of certifying a card 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 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 recording medium to judge whether said recording medium is justifiable.

16. The method as claimed in claim 15, wherein the conversion to the frequency-area data is Fourier transform.

17. The method as claimed in claim 15, 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.

18. The method as claimed in claim 15, wherein said fourth step compares the differential data obtained every block with the ID information restored from said card recording medium to perform the judgment on the basis of majority voting of the comparison result.

19. The method as claimed in claim 16, wherein said fourth step compares the differential data obtained every block with the ID information restored from said card recording medium to perform the judgment on the basis of majority voting of the comparison result.

20. The method as claimed in claim 17, wherein said fourth step compares the differential data obtained every block with the ID information restored from said card recording medium to perform the judgment on the basis of majority voting of the comparison result.

21. A card 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.

22. The card recording medium enciphering system as claimed in claim 21, 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.

23. The card recording medium enciphering system as claimed in claim 21, wherein said frequency domain transformation means performs FFT, and said frequency domain inverse transformation means performs inverse FFT.

24. The card recording medium enciphering system as claimed in claim 22, wherein said frequency domain transformation means performs FFT, and said frequency domain inverse transformation means performs inverse FFT.

25. The card recording medium enciphering system as claimed in claim 21, wherein said frequency domain transformation means performs DCT, and said frequency domain inverse transformation means performs inverse DCT.

26. The card recording medium enciphering system as claimed in claim 22, wherein said frequency domain transformation means performs DCT, and said frequency domain inverse transformation means performs inverse DCT.

27. A card 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.

28. A card 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.

29. The card recording medium as claimed in claim 28, 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.

30. The card recording medium as claimed in claim 28, 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.

31. The card recording medium as claimed in claim 29, 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.

32. The card recording medium as claimed in claim 28, wherein the specific data are written in a magnetic recording medium.

33. The card recording medium as claimed in claim 29, wherein the specific data are written in a magnetic recording medium.

34. The card recording medium as claimed in claim 30, wherein the specific data are written in a magnetic recording medium.

35. The card recording medium as claimed in claim 28, wherein said card recording medium is used as an ID card or a credit card.

36. The card recording medium as claimed in claim 29, wherein said card recording medium is used as an ID card or a credit card.

37. The card recording medium as claimed in claim 30, wherein said card recording medium is used as an ID card or a credit card.

38. A card 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.

39. The card recording medium as claimed in claim 38, wherein the transformation is discrete cosine transform, and the inverse transform is inverse discrete cosine transform.

40. A card recording medium certifying device for certifying a card 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 recording medium is true or not.

41. A recording medium for storing a program for operating a card 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 recording medium.

42. The recording medium as claimed in claim 41, wherein the transformation is discrete cosine transform, and the inverse transformation is inverse discrete cosine transform.

43. A recording medium for storing a program for operating in a computer a checking system for a card 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 recording medium is true or not.

44. A card 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.

45. The card recording medium as claimed in claim 44, wherein the ID information of the data area are recorded while enciphered.

46. The card recording medium as claimed in claim 44, wherein the first image data is a fingerprint image of the holder.

47. The card recording medium as claimed in claim 44, wherein the first image data is a face photograph image of the holder.

48. The card recording medium as claimed in claim 45, wherein the first image data is a fingerprint image of the holder.

49. The card recording medium as claimed in claim 45, wherein the first image data is a face photograph image of the holder.

50. An apparatus for certifying a card 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 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 date 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 recording medium to judge whether said card recording medium is justifiable.