Vehicle rear view camera system and method

• US 8,994,825 B2
• Filed: 07/26/2012
• Issued: 03/31/2015
• Est. Priority Date: 07/28/2011
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Ramanath, Ravikiran, Bochenek, Jeffrey, Rottner, Gunter
• Primary Examiner(s): Natnael, Paulos M
• Application Number:
  US13/558,748
• Publication Number:
  US 20130027558A1
• Time in Patent Office: 978 Days
• Field of Search: 348/148, 348/115, 348/46, 348/739, 348/153, 348/159
• US Class Current: 348/148
• CPC Class Codes: G06T 3/047 Fisheye or wide-angle transformations

Abstract

A computer-implemented method for reconstructing and displaying an image of an area behind a vehicle. The method includes capturing, by an image capturing device, an image of the area behind the vehicle; receiving, at a controller, the captured image; separating, by the controller, the image into three image pieces; correcting, at the controller, the middle image piece by using a distortion correction algorithm; cropping, at the controller, the first and second side image pieces into a rectangular format; converting, at the controller, the first and second image pieces into a trapezoidal format; aligning, at the controller, the two side image pieces with the corrected middle image piece; and creating, at the controller, a continuous image of the area behind the vehicle.

Claims

1. A computer-implemented method for reconstructing and displaying an image of an area behind a vehicle, the method comprising:

capturing, by an image capturing device, an image of the area behind the vehicle;

receiving, at a controller, the captured image;

separating, by the controller, the image into three image pieces—

a first side piece, a middle piece, and a second side piece;

correcting, at the controller, the middle image piece by using a distortion correction algorithm;

cropping, at the controller, the first and second side image pieces into a rectangular format;

converting, at the controller, the first and second image pieces into a trapezoidal format;

aligning, at the controller, the first and second side image pieces with the corrected middle image piece; and

creating, at the controller, a combined image of the area behind the vehicle.

2. The method of claim 1, wherein the field of view of the middle image piece in the corrected image ranges from about 100 degrees to about 130 degrees.

3. The method of claim 1, wherein the combined field of view of the first side piece and the second side piece in the corrected image ranges from about 50 to about 80 degrees.

4. The method of claim 1, further comprising displaying the combined image on at least one display device in the vehicle.

5. The method of claim 1, wherein the image capturing device includes a wide-angle lens.

6. The method of claim 5, wherein the horizontal field of view of the image capturing device is enlarged to about 180 degrees.

7. The method of claim 5, wherein the vertical field of view of the image capturing device is enlarged.

8. The method of claim 1, wherein converting the first and second image pieces into a trapezoidal format includes performing calibration and image stretching, at the controller, of the first and the second side image pieces.

9. The method of claim 1, further comprising capturing an image of the area behind the vehicle by more than one image capturing device.

10. The method of claim 1, wherein the controller is included in the image capturing device.

11. A system for reconstructing and displaying an image of an area behind a vehicle, the system comprising:

at least one image capturing device configured to capture an image of the area behind the vehicle;

a controller configured to receive the captured image; and

a computer readable medium storing instructions that, when executed by the controller, cause the controller to;

separate the image into three image pieces—

a first side piece, a middle piece, and a second side piece,

correct the middle image piece by using a distortion correction algorithm,

crop the first and second side image pieces into a rectangular format,

convert he first and second image pieces into a trapezoidal format,

align the first and second side image pieces with the corrected middle image piece, and

create a combined image of the area behind the vehicle.

12. The system of claim 11, wherein the field of view of the middle image piece in the corrected image ranges from about 100 degrees to about 130 degrees.

13. The system of claim 11, wherein the combined field of view of the first side piece and the second side piece in the corrected image ranges from about 50 to about 80 degrees.

14. The system of claim 11, wherein the image capturing device includes a wide-angle lens.

15. The system of claim 14, wherein the horizontal field of view of the image capturing device is enlarged to about 180 degrees.

16. The system of claim 14, wherein the vertical field of view of the image capturing device is enlarged.

17. The system of claim 11, wherein the controller performing calibration and image stretching of the first and the second side image pieces.

18. The method system of claim 11, wherein the controller is included in image capturing device.

19. The method system of claim 11, wherein the image capturing device comprises a Video Graphics Array (VGA) camera.