BIRD VIEW VISUAL SYSTEM WITH FISHEYE DISTORTION CALIBRATION AND METHOD THEREOF

• US 20080159594A1
• Filed: 12/28/2007
• Published: 07/03/2008
• Est. Priority Date: 01/03/2007
• Status: Abandoned Application

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Wang, Chun-Chieh, Chiu, Chui-Fan
• Application Number:
  US11/966,222
• Publication Number:
  US 20080159594A1
• Time in Patent Office: Days
• US Class Current: 382/104
• 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 1/27 providing all-round vision, e.g. using omnidirectional cameras
• CPC Class Codes: B60R 2300/102 using 360 degree surveillance camera system
• CPC Class Codes: B60R 2300/105 using multiple cameras
• CPC Class Codes: G06T 5/006 Geometric correction correction of chromatic aberrations adapted to be used in an image pickup device containing an electronic image sensor H04N23/10; detecting, correcting, reducing or removing artefacts resulting only from the lens unit, e.g. flare, shading, vignetting or "cos4" H04N25/61
• CPC Class Codes: G06T 5/80 Geometric correction
• CPC Class Codes: H04N 23/63 by using electronic viewfinders
• CPC Class Codes: H04N 23/698 for achieving an enlarged field of view, e.g. panoramic image capture
• CPC Class Codes: H04N 25/61 the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4"
• CPC Class Codes: H04N 5/2628 Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation

Abstract

A bird view visual system for a vehicle having a fisheye distortion calibration is provided. The bird view visual system includes at least one image sensor equipping therewith a wide lens, for monitoring an environment change around the vehicle and generating an image signal in accordance with the environment change, a control circuit having therein an image processing program for receiving and processing the image signal in order to calibrate a fisheye distortion of the image signal and generate a calibrated image signal, and a display receiving and displaying the calibrated image signal.

Claims

1. A bird view visual system for a vehicle having a fisheye distortion calibration, comprising:

at least one image sensor equipping therewith a wide lens, disposed on a vehicle for monitoring an environment change around the vehicle and generating an image signal in accordance with the environment change;

a control circuit having therein an image processing program for receiving and processing the image signal in order to calibrate a fisheye distortion of the image signal and generate a calibrated image signal; and

a display receiving and displaying the calibrated image signal.

2. A system according to claim 1 further comprising four image sensors.

3. A system according to claim 2, wherein the four image sensors are respectively mounted at a front side, a rear side, a right side and a left side of the vehicle.

4. A system according to claim 1, wherein the wide lens is a fisheye lens.

5. A system according to claim 4, wherein the image processing program calculates an algorithmic parameter obtained from a parameter of the fisheye lens.

6. A system according to claim 1, wherein the control circuit having the image processing program generates the calibrated image signal through a reverse compensation for the fisheye distortion of the image signal.

7. A bird view visual system for a vehicle having a fisheye distortion calibration, comprising:

at least one image sensor disposed on a vehicle for monitoring an environment change around the vehicle and generating an image signal in accordance with the environment change;

a control circuit having therein an image processing program for receiving and processing the image signal in order to calibrate the fisheye distortion of the image signal and generate a calibrated image signal; and

a display receiving and displaying the calibrated image signal.

8. A system according to claim 7 further comprising four image sensors.

9. A system according to claim 8, wherein the four image sensors are respectively mounted at a front side, a rear side, a right side and a left side of the vehicle.

10. A system according to claim 7, wherein the at least one image sensor is equipped with a fisheye lens for enlarging a viewing range thereof.

11. A system according to claim 10, wherein the image processing program calculates an algorithmic parameter obtained from a parameter of the fisheye lens.

12. A fisheye distortion calibration method of a bird view visual system for a vehicle, comprising:

(a) providing at least one image sensor mounted on a vehicle for generating a image signal outside the vehicle;

(b) calibrating a fisheye distortion of the image signal through a image processing program in order to generate a calibrated image signal; and

(c) displaying the calibrated image signal.

13. A method according to claim 12 further comprising a step of providing four image sensors respectively mounted at a front side, a rear side, a right side and a left side of the vehicle for monitoring an environment change around the vehicle.

14. A method according to claim 12, wherein the image processing program is integrated into a control circuit.

15. A method according to claim 12, wherein the at least one image sensor is equipped with a fisheye lens for enlarging the image range thereof.

16. A method according to claim 15, wherein the image processing program calculates an algorithmic parameter obtained from a parameter of the fisheye lens.

17. A method according to claim 12, wherein the calibrated image signal is generated by the image processing program through a reverse compensation for the fisheye distortion of the image signal.