Individualized fingerprint scanner

• US 6,628,813 B2
• Filed: 01/16/2001
• Issued: 09/30/2003
• Est. Priority Date: 04/28/1998
• Status: Expired due to Fees

• Current Assignee: Cross Match Technologies Incorporated (Assa Abloy AB)
• Original Assignee: Cross Match Technologies Incorporated (Assa Abloy AB)
• Inventors: Fedele, Dean J., Scott, Walter Guy
• Primary Examiner(s): COUSO, YON JUNG
• Application Number:
  US09/759,344
• Publication Number:
  US 20010033677A1
• Time in Patent Office: 987 Days
• Field of Search: 382/115, 382/116, 382/124-127, 356/71, 250/556, 376/15, 707/6, 707/9, 713/186.2
• US Class Current: 382/124
• CPC Class Codes: G06V 40/1335 Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement

Abstract

A method and apparatus whereby a fingerprint verifier has a mechanism to slide a prism over an imaged area of a camera. The position of the prism being determined by a binary absolute linear code on a sliding mechanism imaged by the same camera at the side of the fingerprint wherein the images are knitted together to simulate a large CCD.

Claims

1. An apparatus for capturing fingerprint images from a fingertip of at least one finger, comprising:

a line image device; and

a moveable prism that moves in a linear motion along a scanning direction transverse to a length of the finger in response to movement of the finger during a scan, wherein said line image device detects a plurality of scan lines of a fingerprint image of the fingertip as the fingertip moves through an imaging area of the line image device, wherein each scan line extends in a direction along said finger length.

2. The apparatus of claim 1, further comprising:

at least one lens for directing said fingerprint image toward said line image device.

3. The apparatus of claim 1, wherein said apparatus further comprises a microprocessor to identify and assemble said plurality of scan lines into an integrated image of said fingertip, wherein said microprocessor extracts and reports quality of image and quality of match for the image of said fingertip to enable acceptance of the image.

4. The apparatus of claim 1, wherein said apparatus operates in a first mode for capturing a roll print and wherein said moveable prism moves along said scanning direction in response to a rolling of the fingertip relative to said moveable prism during the scan.

5. The apparatus of claim 1, wherein said apparatus operates in a second mode for capturing at least one flat print, wherein at least one fingertip is placed on the surface of said moveable prism and wherein said moveable prism moves along said scanning direction in response to linear movement of the fingertips during the scan.

6. The apparatus of claim 1, wherein the fingertip is in frictional contact with a surface of said moveable prism such that a rotational movement of the fingertip about a rotational axis along the length of the fingertip causes the moveable prism to move along said scanning direction.

7. The apparatus of claim 6, wherein the imaging area detected by the line image device extends along the length of the fingerprint in a direction parallel to the rotational axis of the fingertip.

8. The apparatus of claim 1, further comprising a protective layer on a surface of said moveable prism which receives the fingertip.

9. The apparatus of claim 8, wherein the protective layer comprises a platen attached to the surface of the moveable prism.

10. The apparatus of claim 1, wherein the moveable prism comprises a single prism.

30. The apparatus of claim 1, wherein said moveable prism comprises a prism having two triangular bases and three rectangular sides.

31. The apparatus of claim 1, wherein said movable prism comprises a prism having polygons as bases and parallelograms as sides.

33. The apparatus of claim 5 wherein four fingertips are placed on the surface of said moveable prism and said second mode of operation captures a four finger flat print.

11. An apparatus for acquiring fingerprint images, comprising:

an optical platen having a transparent scanning area for placing one or more fingertips, wherein said optical platen is movable in a linear motion along a scanning direction in response to movement of a fingertip during a scan;

a prism, said prism located beneath and attached to said optical platen;

at least one lens for directing an image of one or more fingertips placed upon said platen toward a scan line camera, wherein said scan line camera captures a plurality of scan lines of said image of said one or more fingertips; and

a microprocessor for identifying and assembling said plurality of scan line images to form said fingerprint images,

wherein said apparatus operates in two modes for capturing a roll print and a four finger flat print.

12. The apparatus of claim 11, wherein said scan line images are randomly recorded.

13. The apparatus of claim 11, wherein roll prints for each finger are compared and matched to the fingerprint images obtained from the four finger flat print, and the order of the four fingerprints is verified.

14. The apparatus of claim 12, wherein said randomly recorded scan line images are archived when the quality of the image is acceptable.

15. The apparatus of claim 11, wherein quality of match is determined before said prints are accepted.

16. The apparatus of claim 11, wherein quality of image is determined after said prints are captured.

17. The apparatus of claim 11, wherein said scan line camera is a charge coupled device (CCD) camera.

18. The apparatus of claim 11, wherein said scan line camera is a CMOS camera.

19. The apparatus of claim 11, further comprising:

a sensor for initiating operation of said scan line camera.

20. An apparatus for electronically capturing the attributes of an image of a fingertip, comprising:

a moveable platen assembly that includes a platen surface at a prism;

an optoelectronic device comprising a scan line camera for capturing segments of scanned data from said platen surface, and at least one lens for directing the image placed on said platen toward said scan line camera; and

a microprocessor for identifying and assembling said segments of scanned data,

wherein said microprocessor extracts and reports quality of image and quality of match for the image of the fingertip to trigger acceptance in a configuration menu,

wherein said apparatus operates in two modes for capturing a roll print and a four finger flat print, each mode involving movement of said moveable platen assembly.

21. The apparatus of claim 20, wherein said microprocessor knits together an integrated image of said fingertip after assembling said segments of scanned data.

22. The apparatus of claim 20, further comprising:

a sensor for initiating operation of said scan line camera.

23. The apparatus of claim 20, wherein said moveable platen assembly moves along a scanning direction in response to a finger being rotated.

24. The apparatus of claim 20, wherein said scanned data is randomly recorded.

25. The apparatus of claim 20, wherein the image of the fingertip is archived when the quality of the image is of an acceptable level.

26. The apparatus of claim 20, wherein said scan line camera is a charge coupled device (CCD) camera.

27. The apparatus of claim 20, wherein said scan line camera is a CMOS camera.

28. An apparatus for capturing fingerprint images, comprising:

a line image device;

a prism that moves linearly relative to said line image device, wherein said line image device detects at least a portion of a fingerprint image of a fingertip horizontally rotated on a platen surface of said prism in an imaging area of the line image device, wherein the fingertip is in frictional contact with the platen surface of said prism such that a horizontal rotational movement of the fingertip about a rotational axis along the length of the finger causes the prism to move in a linear motion along a first axis.

29. An apparatus for capturing fingerprint images, comprising:

a line image device;

a prism that moves linearly relative to said line image device in a horizontal direction, wherein said line image device detects at least a portion of a fingerprint image of one or more fingers placed on a platen surface of said prism in an imaging area of the line image device, wherein the one or more fingers are in frictional contact with the platen surface of said prism such that a horizontal movement of the one or more fingers in a direction transverse to a length of said one or more fingers causes the prism to move in a linear motion along the horizontal direction.

32. An apparatus for capturing identifying surface print images, comprising:

a line image device;

a moveable assembly that includes a single prism;

wherein said moveable assembly moves in a linear motion along a scanning direction in response to movement of an object having a print during a scan, wherein said line image device detects a plurality of scan lines across the print as the object moves through an imaging area of the line image device transversely to a length of the object, wherein each scan line extends along a direction approximately perpendicular to the scanning direction; and

a processor that receives data representing said plurality of scan lines and assembles said data into a composite surface print image.

34. An apparatus for capturing an image of at least one fingertip, comprising:

a housing;

an imaging surface having a surface area for contacting said at least one fingertip;

an optoelectronic imaging device in a fixed position relative to the housing;

an optical path extending between said imaging surface and said fixed optoelectronic imaging device such that said optoelectronic imaging device images only a portion of said surface area of said imaging surface intersecting with said optical path;

a guide mechanism attached to said imaging surface and said housing that guides said imaging surface through a range of manual movement relative to said optoelectronic imaging device while at least one fingertip is in contact with said imaging surface, such that movement of said at least one fingertip by a user manually moves said imaging surface to sequentially move different portions of said fingertip into said optical path for imaging by said optoelectronic imaging device; and

a processor connected to the optoelectronic imaging device to receive data for a plurality of images collected during said movement of the fingertip and imaging surface and execute an algorithm to assemble said data for a plurality of images into data representing a composite image,

wherein said processor has a first operating mode wherein said processor generates composite data representing a roll print when the user rolls a single fingertip across the imaging surface and a second operating mode wherein said processor generates composite data representing flat prints for multiple fingers when the user places a plurality of fingertips on said imaging surface and moves said imaging surface to move said plurality of fingertips across said optical path.

35. The apparatus of claim 34 further including a prism having a prism surface arranged at an angle to said imaging surface and located between said imaging surface and said optoelectronic imaging device.

36. The apparatus of claim 35 further including a finger guide adjacent to the imaging surface permitting the user to place said fingertip against both the imaging surface and the finger guide whereby said finger guide and said imaging surface guide said movement of the fingertip by the user in a rolling motion.

37. The apparatus of claim 34 wherein said imaging surface is a planar surface.

38. The apparatus of claim 34 further comprising:

position indicia moving in concert with said imaging surface, said indicia varying with its location on said imaging surface, and

means for reading said position indicia and providing imaging surface position information to said processor to facilitate assembly of data collected at different imaging surface positions into composite image data.

39. An apparatus for capturing an image of at least one fingertip, comprising:

an imaging surface that receives a fingertip in contact therewith, said imaging surface having a surface area,

an optoelectronic imaging device,

an optical path extending between said imaging surface and said optoelectronic imaging device, said optical path including a prism surface of a prism, said prism surface arranged at an angle to said imaging surface, said prism surface located between said imaging surface and said optoelectronic imaging device and at least one lens, all arranged so that said optoelectronic imaging device has a fixed view along said optical path,

a mechanism that allows movement of at least said imaging surface and said prism surface relative to said optoelectronic imaging device and said optical path while the fingertip is in contact with said imaging surface to sequentially move different portions of said fingertip into said optical path for imaging by said optoelectronic imaging device, and

a processor connected to the optoelectronic imaging device to receive data for a plurality of images collected during movement of said fingertip and imaging surface and execute an algorithm that assembles said data into data representing a composite fingertip image.

40. The apparatus of claim 39 wherein said imaging surface is a planar surface.

41. The apparatus of claim 39 wherein said mechanism allows movement of said prism relative to said optoelectronic imaging device.

42. The apparatus of claim 41 wherein said prism extends between said prism surface and said imaging surface.

43. The apparatus of claim 39 wherein said mechanism is a manual mechanism where movement of the fingertip by a user drives said movement of said mechanism.

44. The apparatus of claim 39 wherein said imaging surface moves under the finger in response to rotation of the finger and said assembled data representing a composite fingertip image is roll print image data.

45. The apparatus of claim 44 further including a finger guide for supporting the fingertip during taking of a roll print so that the finger rolls against the imaging surface as the imaging surface moves relative to the optoelectronic imaging device.

46. The apparatus of claim 39 wherein said composite fingertip image is a flat print of at least one finger.

47. The apparatus of claim 46 wherein said surface area of said imaging surface is large enough to simultaneously accommodate a plurality of fingertips and said data representing a composite fingertip image is flat print data for said plurality of fingertips placed on said imaging surface.

48. The apparatus of claim 39 further comprising:

position indicia moving in concert with said imaging surface, said indicia varying with its location on said imaging surface, and

means for reading said position indicia and providing imaging surface position information to said processor to facilitate assembly of data collected at different imaging surface positions into composite image data.

54. The method of claim 39 further comprising the step of supporting the fingertip to facilitate rolling the finger against the imaging surface as the imaging surface moves relative to the optoelectronic imaging device.

55. The method of claim 54 wherein said step of supporting the fingertip comprises the step of providing a finger guide that rotates relative to the imaging surface, and said step of rotating the fingertip comprises rolling the finger against both the imaging surface and the finger guide.

56. The method of claim 39 comprising the further steps of:

providing position indicia moving in concert with said imaging surface and varying with its location on said imaging surface, and

reading said position indicia and providing imaging surface position information to said processor to facilitate assembly of data collected at different imaging surface positions into composite image data.

49. A method for capturing a roll print image of a fingertip, comprising the steps of:

providing an optoelectronic imaging device that images an optical path extending between the imaging device and an imaging surface, said imaging surface movable relative to said imaging device in response to finger movement, said imaging device imaging a portion of said imaging surface for each position of the imaging surface;

placing the fingertip on the imaging surface;

rotating the fingertip from side to side on the imaging surface to move the imaging surface relative to said optical path to present different portions of said fingertip to said optical path for imaging by said imaging device;

using said imaging device, collecting data for a plurality of images during said step of rotating the fingertip and assembling said data into data representing a composite roll print image.

50. The method of claim 49 wherein said imaging surface is a planar surface.

51. The method of claim 49 wherein said optical path includes a prism surface between said imaging device and said imaging surface, said prism surface arranged at an angle to said imaging surface.

52. The method of claim 51 wherein said prism surface is part of a prism in said optical path and said prism moves relative to said optical path in response to said finger movement.

53. The method of claim 52 wherein said prism extends between said prism surface and said imaging surface.

57. An apparatus for capturing roll print fingerprint data for a fingertip, comprising:

imaging surface means for providing a surface against which the fingertip is placed for imaging, where said surface is movable and has a surface area;

imaging means for generating signals representing partial fingertip images appearing on a portion of said surface area along an optical path in a fixed direction of view;

guide means attached to said imaging surface means for guiding said imaging surface means through a range of movement relative to said imaging means while the fingertip is in contact with said imaging surface means such that rotational movement of the fingertip by a user manually moves said imaging surface means to sequentially present different portions of said fingertip into said optical path for imaging by said optoelectronic imaging device as said fingertip rolls; and

processing means connected to the imaging means for receiving a plurality of said signals representing partial fingertip images collected during said movement of the fingertip.

58. The apparatus of claim 57 further including prism means having a prism surface arranged at an angle to said imaging surface and located between said imaging surface and said imaging means.

59. The apparatus of claim 58 wherein said prism means is fixed with respect to said movable imaging surface.

60. The apparatus of claim 57 wherein said guide means further allows the user to move at least one fingertip transversely to the optical path so that movement of the fingertip sequentially presents to said imaging means images of portions of the fingertip as it moves across the optical path, and the processing means further comprises means for assembling image signal data to produce flat print data.

61. The apparatus of claim 60 wherein said movable imaging surface means simultaneously accommodates a plurality of fingertips in contact with said imaging surface means, said range of movement of said guide means permits movement of said plurality of fingertips across the optical path while said plurality of fingertips remain in contact with said imaging surface means.

62. The apparatus of claim 57 further including finger guide means adjacent to the imaging surface means for guiding said movement of the fingertip by a user in a rolling motion.

63. The apparatus of claim 62 wherein said finger guide means includes means for moving said finger guide means away from the imaging surface means to facilitate collection of flat prints.

64. The apparatus of claim 57 wherein said imaging surface means comprises a planar surface.

65. The apparatus of claim 57 further comprising:

position indicating means moving in concert with said imaging surface for providing image surface position information varying with indicia location on said imaging surface, and

means for reading said position indicia and providing said imaging surface position information to said processing means to facilitate assembly of data collected at different imaging surface positions into composite image data.

66. An apparatus for capturing flat print fingerprint data for a plurality of fingertips, comprising:

movable imaging surface means for providing a surface to accommodate the plurality of fingertips placed against said surface for imaging, said surface having a surface area;

imaging means for generating signals representing an image of a portion of said surface area along an optical path in a fixed direction of view;

guide means attached to said imaging surface means for guiding said imaging surface means through a range of movement relative to said imaging means while the plurality of fingertips are in contact with said imaging surface means such that movement of the fingertips by a user manually moves said imaging surface means to sequentially present different portions of said fingertips to said optical path for imaging by said optoelectronic imaging device, and

processing means connected to the imaging means to receive said signals for a plurality of partial fingertip images collected during said movement of the fingertips and assemble said partial fingertip images into data representing composite flat prints of the plurality of fingertips.

67. The apparatus of claim 66 further including prism means having a prism surface arranged at an angle to said imaging surface and located between said imaging surface and said imaging means.

68. The apparatus of claim 67 wherein said prism means is fixed with respect to said movable imaging surface means.

69. The apparatus of claim 66 wherein said range of movement of said guide means permits movement of said plurality of fingertips across the optical path while said plurality of fingertips remain in contact with said imaging surface means.

70. The apparatus of claim 66 further including finger guide means adjacent to the imaging surface means for guiding said movement of the fingertip by a user in a rolling motion and said processing means further includes means for assembling composite roll print data.

71. The apparatus of claim 70 wherein said finger guide means includes means for moving said finger guide means away from the imaging surface means to facilitate collection of flat prints.

72. The apparatus of claim 66 wherein said imaging surface means comprises a planar surface.

73. The apparatus of claim 66 further comprising:

position indicating means moving in concert with said imaging surface for providing image surface position information varying with indicia location on said imaging surface, and

means for reading said position indicia and providing said imaging surface position information to said processing means to facilitate assembly of data collected at different imaging surface positions into composite image data.