CALIBRATION APPARATUS FOR VEHICLE MOUNTED CAMERA

• US 20130127999A1
• Filed: 02/29/2012
• Published: 05/23/2013
• Est. Priority Date: 11/18/2011
• Status: Abandoned Application

• Current Assignee: Toshiba Corporation
• Original Assignee: Toshiba Corporation
• Inventors: KAWAI, Kiyoyuki
• Application Number:
  US13/408,377
• Publication Number:
  US 20130127999A1
• Time in Patent Office: Days
• US Class Current: 348/47
• CPC Class Codes: B60R 1/00 Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
• CPC Class Codes: B60R 2300/402 Image calibration
• CPC Class Codes: G06T 2207/30244 Camera pose
• 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
• CPC Class Codes: H04N 13/246 Calibration of cameras

Abstract

According to one embodiment, an apparatus for calibrating a camera while a vehicle is moving includes a rearward monitoring camera mounted in a vehicle to acquire image information, a memory that stores a camera calibration program for computationally determining and calibrating mounting parameters of the camera while the vehicle is moving, using the image information acquired by the camera, a gear position detector to detect gear positions of the vehicle and generates position signals according to the gear positions and a control unit that receives the image information, and when the gear position detector detects a position signal for other than a reverse gear position, that reads out and executes the camera calibration program stored in the memory.

Claims

1. An apparatus for calibrating a camera while a vehicle is moving, comprising:

a rearward monitoring camera mounted in a vehicle to acquire image information;

a memory that stores a camera calibration program for computationally determining and calibrating mounting parameters of the camera while the vehicle is moving, using the image information acquired by the camera;

a gear position detector to detect gear positions of the vehicle and generates position signals according to the gear positions; and

a control unit that receives the image information, and when the gear position detector detects a position signal for other than a reverse gear position, that reads out and executes the camera calibration program stored in the memory.

2. The apparatus according to claim 1, wherein the camera is a single camera.

3. The apparatus according to claim 1, wherein the camera is a stereo camera.

4. The apparatus according to claim 1, further comprising:

a database storing data relating to known road displays on roads on which the vehicle runs, and wherein

the camera calibration program calibrates the mounting parameters by comparing the characteristic points or characteristic lines of the image information actually acquired by the camera with the data stored in the database.

5. The apparatus according to claim 1, wherein the mounting parameters are the set height and the shooting angle of the camera.

6. The apparatus according to claim 1, wherein the mounting parameters are the horizontal angle of the optical axis of the camera.

7. The apparatus according to claim 1, wherein the memory has a data area for holding the calibration data obtained during or after the execution of the camera calibration program.

8. The apparatus according to claim 3, wherein the camera calibration program is executed to determine the corresponding points between the cameras and calibrate the mounting parameters, utilizing that the corresponding points are found on the epipolar plane of the cameras.

9. A calibration apparatus for a vehicle mounted camera comprising:

a first camera for forward monitoring mounted in a vehicle;

a second camera for rearward monitoring mounted in the vehicle;

a memory that stores a moving camera calibration program for computationally determining and calibrating mounting parameters of the first camera according to image information acquired by the first camera and for computationally determining and calibrating mounting parameters of the second camera according to image information acquired by the second camera;

a gear position detecting unit that detects the gear position of the vehicle and generates a position signal according to the gear position; and

a control unit that receives the image information acquired by the second camera as input and reads out the moving camera calibration program stored in the memory to calibrate the second camera when the gear position detecting unit detects a position signal for a forward moving gear position; and

receives the image information acquired by the first camera as input and reads out the calibration program stored in the memory to calibrate the first camera when the gear position detecting unit detects a position signal for the reverse gear position.

10. The apparatus according to claim 9, wherein the first camera is a single camera.

11. The apparatus according to claim 9, wherein the first camera is a stereo camera.

12. The apparatus according to claim 9, further comprising:

a database for road displays on roads on which the vehicle runs, and wherein

the moving camera calibration program calibrates the mounting parameters by comparing the characteristic points or characteristic lines of the actual image acquired by the first camera or the second camera with the data in the database.

13. The apparatus according to claim 9, wherein the mounting parameters are the set height and the shooting angle of the first camera or the second camera.

14. The apparatus according to claim 9, wherein the mounting parameters are the horizontal angle of the optical axis of the first camera or the second camera.

15. The apparatus according to claim 9, wherein the memory has a data area for holding the calibration data obtained during or after the execution of the moving camera calibration program.

16. The apparatus according to claim 11, wherein the moving camera calibration program is executed to determine the corresponding points between the first cameras and calibrate the mounting parameters, utilizing that the corresponding points are found on the epipolar plane of the cameras.

17. The apparatus according to claim 11, wherein the moving camera calibration program is executed to determine the corresponding points between the second cameras and calibrate the mounting parameters, utilizing that the corresponding points are found on the epipolar plane of the cameras.