Method and apparatus for mapping system calibration

• US 6,594,007 B2
• Filed: 12/07/2001
• Issued: 07/15/2003
• Est. Priority Date: 02/02/2001
• Status: Expired due to Fees

• Current Assignee: Snap-On Technologies Incorporated (Snap-On Incorporated)
• Original Assignee: Snap-On Technologies Incorporated (Snap-On Incorporated)
• Inventors: Jones, Barbara L.
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): Andrea, Brian K
• Application Number:
  US10/005,288
• Publication Number:
  US 20020131039A1
• Time in Patent Office: 585 Days
• Field of Search: 356/139.03, 356/152.1, 702/40, 702/94, 702/95, 702/150, 702/151, 702/152
• US Class Current: 356/139.03
• CPC Class Codes: G01B 11/245 using a plurality of fixed, simultaneously operating transducers G01B11/2408 - G01B11/2425, G01B11/255 take precedence
• CPC Class Codes: G01B 21/042 Calibration or calibration artifacts G01B3/30, G01B9/02072 take precedence
• CPC Class Codes: G01B 21/20 for measuring contours or curvatures, e.g. determining profile
• CPC Class Codes: G01S 5/16 using electromagnetic waves other than radio waves

Abstract

Method and apparatus for calibration of 3-dimensional mapping systems applicable to automotive crash repair and diagnostics in which a calibration assembly provides accurate 3-dimensional optical inputs to a camera unit for calibration of the internal dimensional constants of the unit. The 3-dimensional calibration apparatus employs twin spaced mounting planes for patterns of optical emitters at known spacings and dispositions from the fixed camera unit position whereby tight tolerances in manufacture and assembly enable the apparatus to be more compact than a typical work piece to be mapped.

Claims

1. Apparatus for calibration of a 3-dimensional coordinate determination system comprising:

transmitting apparatus for emitting energy signals,

receiving apparatus for receiving energy signals, and

a processor coupled to the transmitting apparatus and to the receiving apparatus for evaluating transmitted energy signals,

one of the transmitting apparatus and the receiving apparatus including plural elements respectively disposed at known locations in at least two spaced-apart mounting planes,

the other of the transmitting apparatus and the receiving apparatus being disposed at known distances from and attitudes with respect to the known locations so as to enable effective transmission of energy signals between the transmitting apparatus and the receiving apparatus for calibration purposes.

2. The apparatus of claim 1, wherein the at least one of the transmitting apparatus and the receiving apparatus is the transmitting apparatus and includes plural transmitters.

3. The apparatus of claim 2, wherein each of the plural transmitters is a light-emitting diode.

4. The apparatus of claim 3, wherein the receiving apparatus includes a camera.

5. The apparatus of claim 4, wherein the camera includes plural camera units each including an optical sensing module.

6. A method of calibrating a 3-dimensional coordinate determination system comprising:

providing a transmitting apparatus and a receiving apparatus at least one of which includes plural elements,

mounting the plural elements of the at least one of the transmitting and receiving apparatuses at known locations in plural spaced-apart mounting planes,

disposing the other of the transmitting and receiving apparatuses at one or more fixed locations at known distances from and attitudes with respect to the known locations,

causing the effective transmission of energy signals between the transmitting apparatus and the receiving apparatus, and

evaluating the transmitted energy signals for calibration purposes.

7. The method of claim 6, wherein the mounting includes mounting plural transmitters of the transmitting apparatus.

8. The method of claim 7, wherein the energy transmission includes transmission of optical energy.

9. The method of claim 8, wherein the disposing includes disposing a camera at the fixed locations.

10. The method of claim 9, wherein the disposing includes disposing plural optical sensors of the camera respectively at fixed locations.

11. Apparatus for calibration of a 3-dimensional coordinate determination system comprising:

first communication apparatus mounted on a first mounting structure at a first predetermined location,

second communication apparatus mounted on a second mounting structure at a second predetermined location a known distance from the first location, and

third communication apparatus mounted on a third mounting structure at a third predetermined location disposed between the first and second locations at known distances from each,

each of the communication apparatuses being capable of transmitting or receiving energy signals,

the communication apparatuses being arranged for transmitting energy signals between the first and second communication apparatuses and between the first and third communication apparatuses,

the third mounting structure having a window therein to permit an uninterrupted transmission of energy signals between the first and second communication apparatuses.

12. The apparatus of claim 11, wherein the communication apparatuses are optical apparatuses.

13. The apparatus of claim 11, wherein the first communication apparatus is a receiving apparatus and the second and third communication apparatuses are transmitting apparatuses.

14. The apparatus of claim 13, wherein the receiving apparatus includes a camera and each of the transmitting apparatuses includes a light source.

15. The apparatus of claim 14, wherein each of the transmitting apparatuses includes plural light-emitting diodes and the camera includes plural optical sensing units.

16. The apparatus of claim 11, wherein each of the second and third mounting structures includes a plate defining a mounting plane in which the associated communication apparatus is mounted.

17. The apparatus of claim 16, and further comprising bracing structure interconnecting the first and second mounting structures for minimizing relative movement thereof.

18. The apparatus of claim 11, wherein the window includes at least one aperture in the third mounting structure.

19. The apparatus of claim 18, wherein the window includes an array of apertures in the third mounting structure.

20. A method for calibrating a 3-dimensional coordinate determination system comprising:

mounting a first communication apparatus on a first mounting structure at a first predetermined location,

mounting a second communication apparatus on a second mounting structure at a second predetermined location a known distance from the first location, and

mounting a third communication apparatus on a third mounting structure at a third predetermined location disposed between the first and second locations at known distances from each,

transmitting energy signals between the first and second communication apparatuses and between the first and third communication apparatuses, and

providing a window in the third mounting structure to permit an uninterrupted transmission of energy signals between the first and second communication apparatuses.

21. The method of claim 20, wherein the transmitting includes transmitting signals from each of the second and third communication apparatuses to the first communication apparatus.

22. The method of claim 21, wherein the transmitting includes transmitting optical signals.

23. The method of claim 22, wherein each of the second and third communication apparatuses includes plural light sources, the mounting including mounting the plural light sources respectively at different positions in each of the first and second locations.

24. The method of claim 20, wherein the transmitting includes the transmission of optical signals.

25. The method of claim 20, wherein each of the second and third mounting structures includes a mounting plane, the mounting steps include mounting the second and third communication apparatuses in the mounting planes.