Method and apparatus for calibrating a video display overlay

• US 20090179916A1
• Filed: 01/10/2008
• Published: 07/16/2009
• Est. Priority Date: 01/10/2008
• Status: Abandoned Application

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Williams, Steven A., Dhua, Arnab S.
• Application Number:
  US12/008,370
• Publication Number:
  US 20090179916A1
• Time in Patent Office: Days
• US Class Current: 345/629
• CPC Class Codes: G06T 2207/30252 Vehicle exterior; Vicinity of vehicle
• CPC Class Codes: G06T 7/80 Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration

Abstract

A method and apparatus for calibrating a video display overlay. The method includes the steps of providing calibration indicia, providing an image capture device and an image processor operatively connected to the image capture device, positioning the image capture device with respect to the calibration indicia, capturing an image of the calibration indicia using the image capture device, analyzing the image using the image processor to identify the portions of the image that correspond to the calibration indicia, outputting the result as calibration indicia position data, and calculating a calibration data set based on the calibration indicia position data using the image processor. The apparatus includes calibration indicia, an image capture device directed toward the calibration indicia for providing a reference image, and an image processor electrically connected to the image capture device.

Claims

1. An apparatus for calibrating a video display overlay, comprising:

a calibration workstation having calibration indicia disposed therein;

an image capture device adapted to be vehicle-mounted, the image capture device disposed within the calibration workstation and directed toward the calibration indicia, wherein the image capture device is operable to provide a reference image depicting the calibration indicia; and

an image processor electrically connected to the image capture device, wherein the image processor is operable to receive the reference image, identify the portions of the reference image that correspond to the calibration indicia, and thereby calculate a calibration data set.

2. The apparatus of claim 1, wherein the image capture device is operable to output a video signal, and the image processor is operable to generate an overlay image based on the calibration data set, receive the video signal from the image capture device, and superimpose the overlay image on the video signal to provide a composite video signal.

3. The apparatus of claim 2, wherein the calibration data set includes a pitch angle of the image capture device with respect to the calibration indicia and a pan angle of the image capture device with respect to the calibration indicia.

4. The apparatus of claim 2, wherein the overlay image includes a plurality of path lines, and the calibration data set includes path line position data for indicating the positions of the path lines in the composite video signal.

5. The apparatus of claim 2, wherein the overlay includes a plurality of distance lines, and the calibration data set includes distance line position data for indicating the positions of the distance lines in the composite video signal.

6. The apparatus of claim 2, wherein the overlay image includes a plurality of path lines and a plurality of distance lines.

7. The apparatus of claim 1, wherein the calibration indicia includes a plurality of path line indicators and a plurality of distance line indicators.

8. A method for calibrating a video display overlay, comprising:

providing calibration indicia;

providing an image capture device adapted to be vehicle-mounted, and an image processor operatively connected to the image capture device;

positioning the image capture device with respect to the calibration indicia;

capturing an image of the calibration indicia using the vehicle-mounted image capture device;

analyzing the image using the image processor to identify the portions of the image that correspond to the calibration indicia and outputting the result as calibration indicia position data; and

calculating a calibration data set based on the calibration indicia position data using the image processor.

9. The method of claim 8, further comprising the steps of:

providing a monitor operatively connected to the image processor;

generating an overlay image based on the calibration data set;

generating a video signal using the image capture device;

superimposing the overlay image on the video signal to provide a composite video signal; and

displaying the composite video signal on the monitor.

10. The method of claim 9, further comprising the steps of:

providing the calibration indicia having a plurality of path line indicators and a plurality of distance line indicators.

11. The method of claim 9, further comprising the steps of:

providing the calibration data set having a pitch angle of the image capture device with respect to the calibration indicia and a pan angle of the image capture device with respect to the calibration indicia.

12. The method of claim 9, further comprising the steps of:

providing the overlay having a plurality of path lines; and

providing the calibration data set having path line position data for indicating the positions of the path lines in the composite video signal.

13. The method of claim 9, further comprising the steps of:

providing the overlay having a plurality of distance lines; and

providing the calibration data set having distance line position data for indicating the positions of the distance lines in the composite video signal.

14. The method of claim 9, further comprising the steps of:

providing the overlay having a plurality of path lines and a plurality of distance lines.

15. The method of claim 9, further comprising the steps of:

providing the calibration indicia having a plurality of path line indicators and a plurality of distance line indicators.

16. A method for calibrating a video display overlay, comprising:

providing a vehicle assembly line having a calibration workstation having calibration indicia located therein;

providing a vehicle having an image capture device mounted thereto, an image processor disposed within the vehicle and operatively connected to the image capture device, and a monitor operatively connected to the image processor;

positioning the vehicle within the calibration workstation at a predetermined location with respect to the calibration indicia;

capturing an image of the calibration indicia using the vehicle-mounted image capture device;

analyzing the image using the image processor to provide a calibration data set;

storing the calibration data set in a data storage medium operatively associated with the image processor;

generating an overlay image based on the calibration data set;

generating a video signal using the image capture device;

superimposing the overlay image on the video signal to provide a composite image; and

displaying the composite image on the monitor.

17. The method of claim 16, wherein the calibration indicia includes a plurality of path line indicators and a plurality of distance line indicators.

18. The method of claim 16, further comprising the steps of:

providing the overlay having a plurality of path lines and a plurality of distance lines; and

providing the calibration data set having path line position data for indicating the positions of the path lines in the composite video signal and distance line position data for indicating the positions of the distance lines in the composite video signal.

19. The method of claim 16, further comprising the steps of:

providing the calibration data set having a pitch angle of the image capture device with respect to the calibration indicia and a pan angle of the image capture device with respect to the calibration indicia.