Scanner system and method for mapping surface of three-dimensional object

• US 7,609,875 B2
• Filed: 05/27/2005
• Issued: 10/27/2009
• Est. Priority Date: 05/27/2005
• Status: Active Grant

• Current Assignee: Orametrix Incorporated
• Original Assignee: Orametrix Incorporated
• Inventors: Getto, Phillip, Liu, Yongqian
• Primary Examiner(s): Mehta; Bhavesh M
• Assistant Examiner(s): ZARKA, DAVID PETER
• Application Number:
  US11/139,454
• Publication Number:
  US 20060269896A1
• Time in Patent Office: 1,614 Days
• Field of Search: 382/154
• US Class Current: 382/154
• CPC Class Codes: A61C 13/0003 Making bridge-work, inlays, implants or the like
• CPC Class Codes: A61C 7/00 Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
• CPC Class Codes: A61C 7/002 Orthodontic computer assisted systems
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures

Abstract

A scanning system is disclosed including a hand-held scanning device for capturing three-dimensional information of an object. The scanner system includes a high-speed transceiver having a high-speed laser light source, a high frequency MEMS oscillating scanning mirror and software for frame registration. Laser based range finding technique is used to map the scanned object. MEMS oscillating at high speed enables rapid and accurate scanning of an object. The scanning can be performed without knowledge or even precise control of the position of the object relative to the scanner. Random movement of the object during scanning is also possible. The scanner can be used for a variety of purposes, including medical and industrial purposes. The illustrated embodiment is in-vivo scanning of human teeth for purposes of orthodontic treatment planning and diagnosis. Several benefits from the scanner are possible: much higher resolution of the scanned object, improved acquisition speed of the three-dimensional information of the surface of the object to be mapped, and the improvement in virtual image clarity.

Claims

1. A scanner system for mapping the three-dimensional surface of an object, comprising:

a laser light source;

an oscillating Micro-Electro-Mechanical Systems (“

MEMS”

) mirror;

a receiver;

a processing unit; and

a memory;

wherein said laser light source emits a beam towards said MEMS mirror;

wherein said MEMS mirror, while oscillating, reflects said beam;

wherein said beam reflected by said MEMS mirror impacts a group of one or more points on said surface of said object dependent upon position of said MEMS mirror during an oscillation cycle;

wherein each of said group of one or more points on said surface of said object further reflects said beam;

wherein said receiver receives said beam further reflected by each of said group of one or more points on said surface of said object;

wherein said processing unit comprises computer instructions enabling monitoring of parameters comprising (a) characteristics of (i) said beam emitted by said laser light source and (ii) said beam further reflected by each of said group of one or more points on said surface of said object and received by said receiver;

(b) (i) emission beginning timing of said beam emitted by said laser light source and (ii) receipt timing of said beam further reflected by each of said group of one or more points on said surface of said object and received by said receiver; and

(c) oscillation angles of said oscillating MEMS mirror; and

computer instructions for computing from said parameters a three-dimensional mapping information of said surface of said object;

wherein said laser light source and said MEMS mirror are movable for scanning different areas of said surface of said object;

wherein said memory stores said three-dimensional mapping information of said surface of said object.

2. The scanner system of claim 1, wherein said laser light source emits said beam modulated at a frequency of 10 GHz or higher.

3. The scanner system of claim 1, wherein said laser light source emits said beam at a wavelength of 1550 nm or 1310 nm.

4. The scanner system of claim 1, wherein said oscillating MEMS mirror is mounted on a pair of housings enabling oscillation of said MEMS mirror on an x-axis at speed x and a y-axis at speed y;

wherein said y-axis is perpendicular to said x-axis.

5. The scanner system of claim 4, wherein the ratio of said speed x to said speed y is 1:

7.

6. The scanner system of claim 4, wherein said speed x is 1.3 kHz and said speed y is 9.1 kHz.

7. The scanner system of claim 1, wherein said oscillating MEMS mirror is circular in shape.

8. The scanner system of claim 1, wherein said oscillating MEMS mirror is elliptical in shape.

9. The scanner system of claim 1, wherein said emitted beam from said laser light source is collimated prior to reaching said oscillating MEMS mirror.

10. The scanner system of claim 9, wherein said oscillating MEMS mirror reflects said emitted beam into a beam splitter wherein said beam splitter directs said emitted laser beam towards a static mirror wherein said static mirror reflects said emitted beam on to said surface of said object.

11. The scanner system of claim 10, wherein said collimator, said MEMS mirror and said beam splitter are contained in a housing sized and shaped to be held in a human hand.

12. The scanner system of claim 11, wherein said housing further comprises a distal portion holding said static mirror, and wherein said distal portion is sized and shaped so as to be insertable into and moveable within an oral cavity of a human for scanning of anatomical structures inside the oral cavity.

13. The scanner system of claim 12, wherein said static mirror is heated while scanning said object.

14. The scanner system of claim 1, wherein said beam reflected by said surface of said object passes through a beam splitter prior to reaching said receiver.

15. The scanner system of claim 1, wherein said receiver has a sensitivity of 10 pico-seconds rise time.

16. The scanner system of claim 1, wherein a frame comprises said group of one or more points on said surface of said object;

and wherein said processing unit further comprises computer instructions for executing a registration algorithm for creating a virtual model of said object from said frames of said surface of said object.

17. The scanner system of claim 16, wherein said memory and said processing unit are located in a scanning workstation, said scanning workstation further comprising a monitor operatively connected to said processing unit, said monitor displaying three-dimensional images of said object during or after scanning of said surface of said object.

18. The scanner system of claim 16, wherein said computer instructions perform a frame-to-frame registration.

19. The scanner system of claim 16, wherein said computer instructions perform a cumulative registration.

20. The scanner system of claim 1, wherein said object comprises one or more teeth.

21. The scanner system of claim 1, wherein said object comprises a work of art.

22. The scanner system of claim 1, wherein said object comprises a human body.

23. The scanner system of claim 1, wherein said object comprises a work piece.

24. A method of scanning the three-dimensional surface of an object, comprising the steps of:

(a) positioning a scanner proximate to an object;

said scanner having a light source and an oscillating Micro-Electro-Mechanical Systems (“

MEMS”

) mirror;

said MEMS mirror directing a laser beam emitting from said light source towards a surface of an object;

said scanner further having a means for capturing said laser beam reflected off of said surface of said object;

(b) scanning, with said scanner, while keeping said scanner in substantially stationary position relative to said object, a frame from said surface wherein said frame comprises a group of points on said surface scanned during a complete oscillation cycle of said MEMS mirror, wherein said scanning step comprises scanning every point in said frame and wherein the step of scanning a point comprises the sub-steps of;

(i) emitting said laser beam from said light source towards said oscillating MEMS mirror;

(ii) directing said emitted laser beam using said oscillating MEMS mirror towards said point on said surface whereby said point on said surface reflects said emitted laser beam upon impact on said point on said surface;

(iii) receiving the laser beam reflected by said point on said surface into a receiver using said means for capturing the reflected laser beam;

(iv) recording, with a processing unit, parameters comprising (a) characteristics of (i) said laser beam emitted by said light source and (ii) said laser beam reflected by said point on said surface of said object and received by said receiver;

(b) (i) emission beginning timing of said laser beam emitted by said light source and (ii) receipt timing of said laser beam reflected by said point on said surface and received by said receiver; and

(c) oscillation angle of said oscillating MEMS mirror;

(v) computing from said parameters, using said processing unit, a three-dimensional mapping information of said point on said surface; and

(vi) storing said computed three-dimensional mapping information of said point of said surface in a memory;

(c) moving said scanner and said object relative to each other; and

(d) repeating steps (b) and (c) and capturing, with said scanner, a series of frames off of said surface of said object as said scanner and said surface move relative to each other;

(e) processing said series of frames, each of said frames comprising spatial coordinates for said group of points in said frame, and

(f) registering overlapping areas of said frames to each other to generate a three-dimensional virtual model of said object.

25. The method of claim 24, wherein step (f) is performed using frame-to-frame registration.

26. The method of claim 25, further comprising the step of executing a cumulative registration algorithm to register said series of frames to derive said three-dimensional model of said surface of said object.

27. The method of claim 24, wherein step (e) of processing comprises the sub-steps of:

(a) calculating z coordinate of said point using a range finding technique; and

(b) calculating x and y coordinates of said point.

28. The method of claim 24, wherein said scanner comprises a hand-held unit.

29. The method of claim 24, wherein said scanner is used to obtain a three-dimensional model of an anatomical structure.

30. The method of claim 29, wherein said anatomical structure comprises teeth.

31. The method of claim 30, wherein said teeth are scanned in-vivo with said scanner.

32. The method of claim 31, wherein said scanner comprises a housing having a distal portion holding a static mirror, and wherein said distal portion is sized and shaped so as to be insertable into and moveable within an oral cavity of a human for scanning of anatomical structures inside the oral cavity.

33. The method of claim 32, wherein said static mirror is heated while scanning said oral cavity of said human.

34. The method of claim 30, wherein a physical model is made from said anatomical structure and wherein said scanner scans said physical model.

35. The method of claim 34, wherein said physical model comprises a model of a patient'"'"'s teeth and surrounding anatomical structures.

36. A scanner system for mapping the three-dimensional surface of an object, comprising:

a laser light source;

a collimator;

an oscillating Micro-Electro-Mechanical Systems (“

MEMS”

) mirror;

a receiver;

a beam splitter;

a static mirror;

a processing unit; and

a memory;

wherein said laser light source emits a beam towards said collimator;

wherein said collimator collimates said beam emitted from said laser light source and transmits said collimated beam towards said MEMS mirror;

wherein said MEMS mirror, while oscillating, reflects said collimated beam towards said beam splitter;

wherein said beam splitter directs said beam reflected by said MEMS mirror towards said static mirror;

wherein said static mirror further reflects said beam on to surface of an object;

wherein said surface of said object reflects said beam;

wherein said receiver receives said beam reflected by said surface of said object;

wherein said processing unit comprises computer instructions enabling monitoring of parameters comprising (a) characteristics of (i) said beam emitted by said laser light source and (ii) said beam further reflected by said surface of said object and received by said receiver;

(b) (i) emission beginning timing of said beam emitted by said laser light source and (ii) receipt timing of said beam reflected by said surface of said object and received by said receiver; and

(c) position of said oscillating MEMS mirror; and

computer instructions for computing there from a three-dimensional mapping information of said surface of said object;

wherein said memory stores said three-dimensional mapping information of said surface of said object.

37. The scanner system of claim 36, wherein said laser light source emits said beam modulated at a frequency of 10 GHz or higher.

38. The scanner system of claim 36, wherein said laser light source emits said beam at a wavelength of 1550 nm or 1310 nm.

39. The scanner system of claim 36, wherein said MEMS mirror is mounted on a pair of housings enabling oscillation of said MEMS mirror on an x-axis at speed x and a y-axis at speed y;

wherein said y-axis is perpendicular to said x-axis.

40. The scanner system of claim 39, wherein the ratio of said speed x to said speed y is 1:

7.

41. The scanner system of claim 39, wherein said speed x is 1.3 kHz and said speed y is 9.1 kHz.

42. The scanner system of claim 39, wherein said beam reflected by said MEMS mirror impacts a group of one or more points on said surface of said object depending upon position of said MEMS mirror during an oscillation cycle;

wherein said group of one or more points on said surface of said object constitutes a frame.

43. The scanner system of claim 42, wherein said laser light source and said MEMS mirror are movable for scanning different areas of said surface of said object thereby producing multiple frames.

44. The scanner system of claim 43, wherein said processing unit further comprises computer instructions enabling frame-to-frame registration of said frames thereby mapping said surface of said object in three-dimension.

45. The scanner system of claim 43, wherein said processing unit further comprises computer instructions enabling cumulative registration of said frames thereby mapping said surface of said object in three-dimension.

46. The scanner system of claim 36, wherein said MEMS mirror is circular in shape.

47. The scanner system of claim 36, wherein said MEMS mirror is elliptical in shape.

48. The scanner system of claim 36, wherein said beam reflected by said surface of said object passes through second beam splitter prior to reaching said receiver.

49. The scanner system of claim 36, wherein said receiver has a sensitivity of 10 pico-seconds rise time.

50. The scanner system of claim 36, wherein said collimator, said MEMS mirror and said beam splitter are contained in a housing sized and shaped to be held in a human hand.

51. The scanner system of claim 50, wherein said housing further comprises a distal portion holding said static mirror, and wherein said distal portion is sized and shaped so as to be insertable into and moveable within an oral cavity of a human for scanning of anatomical structures inside the oral cavity.

52. The scanner system of claim 36, wherein said memory and said processing unit are located in a scanning workstation, said scanning workstation further comprising a monitor operatively connected to said processing unit, said monitor displaying three-dimensional images of said object during or after scanning of said surface of said object.

53. The scanner system of claim 36, wherein said object comprises one or more teeth.

54. The scanner system of claim 36, wherein said object comprises a work of art.

55. The scanner system of claim 36, wherein said object comprises a human body.

56. The scanner system of claim 36, wherein said object comprises a work piece.