Non-contact vehicle measurement method and system

• US 20060152711A1
• Filed: 12/28/2005
• Published: 07/13/2006
• Est. Priority Date: 12/30/2004
• Status: Abandoned Application

• Current Assignee: Snap-On Incorporated
• Original Assignee: Snap-On Incorporated
• Inventors: Glickman, Stephen L., Dale, James L. Jr.
• Application Number:
  US11/319,209
• Publication Number:
  US 20060152711A1
• Time in Patent Office: Days
• US Class Current: 356/139.90
• CPC Class Codes: G01B 11/2755 using photoelectric detection means
• CPC Class Codes: G01B 2210/143 One or more cameras on each side of a vehicle in the main embodiment
• CPC Class Codes: G01B 2210/146 Two or more cameras imaging the same area
• CPC Class Codes: G01B 2210/303 fixed to the ground or to the measuring station

Abstract

An image-based, non-contact measurement method and system for determining spatial characteristics and parameters of an object under measurement. Image capturing devices, such as cameras, are used to capture images of an object under measurement from different viewing angles. A data processing system performs computations of spatial characteristics of the object under measurement based on the captured images.

Claims

1. A measurement system comprising:

at least one image capturing device configured to produce at least two images of an object from different viewing angles; and

a data processing system configured to determine spatial characteristics of the object based on data derived from the at least two images.

2. The system of claim 1, wherein:

the at least one image capturing device includes a plurality of image capturing devices;

each of the plurality of image capturing devices corresponds to a wheel of a vehicle, and is configured to produce at least two images of the wheel from different viewing angles;

the system of claim 1 further includes a calibration arrangement for producing information representative of relative positional relationships between the plurality of image capturing devices; and

the data processing system is configured to determine spatial characteristics of wheels of the vehicle based on the images produced by the plurality of image capturing devices, and the information representative of relative positional relationships between the plurality of image capturing devices.

3. The system of claim 2, wherein:

the calibration arrangement includes a combination of at least one calibration camera and at least one calibration target;

each of the at least one calibration camera and the at least one calibration target is attached to one of the plurality of image capturing devices in a known positional relationship; and

each of the at least one calibration camera is configured to generate an image of one of the at least one calibration target.

4. The system of claim 2, wherein the calibration arrangement includes a calibration target attached to each of the plurality of image capturing devices being viewed by a common calibration camera.

5. The system of claim 2, wherein:

the information representative of relative positional relationships between the plurality of image capturing devices are generated based on images of a plurality of calibration targets,

the positional relationship between the plurality of calibration targets is known,

an image of each of the plurality of calibration targets is captured by one of the at least one image capturing devices or at least one calibration camera, and

each of the at least one calibration camera is attached to one of the at least one image capturing devices in a known positional relationship.

6. The system of claim 2 further including:

a platform for supporting the vehicle at a predetermined location on the platform;

a plurality of docking stations disposed at predetermined locations relative to the platform, wherein the positional relationships between the plurality of docking stations are known; and

each of the plurality of image capturing device is configured to install on one of the plurality of docking stations for capturing images of the wheel of the vehicle;

wherein the data processing system is configured to determine spatial characteristics of the wheels of the vehicle based on the positional relationships between the plurality of docking stations and the images produced by the plurality of image capturing devices.

7. The system of claim 1, wherein the object is a vehicle wheel.

8. A measurement system comprising:

imaging means for producing at least two images of an object from different viewing angles; and

data processing means for determining spatial characteristics of the object based on data derived from the at least two images.

9. The system of claim 8, wherein:

the imaging means includes a plurality of image capturing devices;

each of the plurality of image capturing devices corresponds to a wheel of a vehicle, and is configured to produce at least two images of the wheel from different viewing angles;

the system of claim 8 further includes calibration means for producing information representative of relative positional relationships between the plurality of image capturing devices; and

the data processing means determines spatial characteristics of wheels of the vehicle based on the images produced by the plurality of image capturing devices, and the information representative of relative positional relationships between the plurality of image capturing devices.

10. The system of claim 9, wherein:

the calibration means includes a combination of at least one calibration camera and at least one calibration target;

each of the at least one calibration camera and the at least one calibration target is attached to one of the plurality of image capturing devices in a known positional relationship; and

each of the at least one calibration camera is configured to generate an image of one of the at least one calibration target.

11. The system of claim 9, wherein the calibration means includes a calibration target attached to each of the plurality of image capturing devices being viewed by a common calibration camera.

12. The system of claim 9, wherein:

the information representative of relative positional relationships between the plurality of image capturing devices are generated based on images of a plurality of calibration targets,

the positional relationship between the calibration targets is known,

an image of each of the plurality of calibration targets is captured by one of the at least one image capturing devices or at least one calibration camera, and

each of the at least one calibration camera is attached o one of the at least one image capturing devices in a known positional relationship.

13. The system of claim 9 further including:

means for supporting the vehicle at a predetermined location on the supporting means; and

docking means, disposed at predetermined locations relative to the supporting means, for receiving a respective one of the plurality of image capturing devices;

wherein;

the positional relationships between the plurality of docking stations are known;

each of the imaging image capturing devices is configured to install on one of the docking means for capturing images of a wheel of the vehicle; and

the data processing system is configured to determine spatial characteristics of the wheels of the vehicle based on the positional relationships between the docking means and the images produced by the plurality of image capturing devices.

14. The system of claim 8, wherein the object is a wheel.

15. A measurement method including the steps of:

obtaining images of at least one wheel of a vehicle from two different angles; and

determining spatial characteristics of the at least one wheel of the vehicle based on data related to the obtained images.

16. The method of claim 15 further including the steps of:

providing a plurality of image capturing devices, wherein each of the plurality of image capturing devices corresponds to one of the at least one wheel of the vehicle, and is configured to produce images of the corresponding wheel from two different angles;

producing calibration information representative of a relationship between the plurality of image capturing devices; and

determining the spatial characteristics of the at least one wheel of the vehicle based on the images produced by the plurality of image capturing devices, and the information representative of relative positional relationships between the image capturing devices.

17. The method of claim 16, wherein:

the calibration information is generated by calibration means including a combination of at least one calibration camera and at least one calibration target;

each of the at least one calibration camera and the at least one calibration target is attached to one of the plurality of image capturing devices in a known positional relationship; and

each of the at least one calibration camera is configured to generate an image of one of the at least one calibration target.

18. The method of claim 16, wherein:

the calibration information is generated by calibration means including a calibration target attached to each respective image capturing device, and

each calibration target is viewed by a common calibration camera.

19. The method of claim 16, wherein:

the calibration information is generated based on images of a plurality of calibration targets,

the positional relationship between the calibration targets is known,

an image of each of the plurality of calibration targets is captured by one of the at least one image capturing devices or at least one calibration camera, and

each of the at least one calibration camera is attached to one of the at least one image capturing devices in a known positional relationship.

20. The method of claim 16, wherein:

the vehicle is supported by a platform at a predetermined location on the platform;

the calibration information is generated by calibration means,

the calibration means includes;

a plurality of docking stations disposed at predetermined locations relative to the platform, wherein the positional relationships between the plurality of docking stations are known; and

each respective image capturing device is configured to install on one of the plurality of docking stations for capturing images of a corresponding wheel of the vehicle; and

the spatial characteristics of the at least one wheel of the vehicle are determined based on the positional relationships between the docking stations and the images produced by the image capturing devices.