Vehicle vision system with calibration algorithm
First Claim
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1. A vision system of a vehicle, said vision system comprising:
- a camera configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle;
wherein said camera comprises a pixelated imaging array having a plurality of photosensing elements;
an image processor operable to process image data captured by said camera;
wherein said camera calibration comprises an estimation of extrinsic parameters and an estimation of intrinsic parameters responsive to determination of the monoview noncoplanar three dimensional calibration pattern distributed on a semi-sphere;
wherein said vision system provides camera calibration using a monoview noncoplanar three dimensional semi-spherical calibration pattern; and
wherein values of distortion polynomial coefficients are estimated using three dimensional calibration points distributed on a semi-sphere by formulating the following;
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Abstract
A vision system of a vehicle includes a camera configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle. The camera may include a fisheye lens. An image processor is operable to process image data captured by the camera. The vision system provides enhanced camera calibration using a monoview noncoplanar three dimensional calibration pattern. The system may include a plurality of cameras configured to be disposed at the vehicle so as to have respective fields of view exterior of the vehicle.
264 Citations
16 Claims
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1. A vision system of a vehicle, said vision system comprising:
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a camera configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle; wherein said camera comprises a pixelated imaging array having a plurality of photosensing elements; an image processor operable to process image data captured by said camera; wherein said camera calibration comprises an estimation of extrinsic parameters and an estimation of intrinsic parameters responsive to determination of the monoview noncoplanar three dimensional calibration pattern distributed on a semi-sphere; wherein said vision system provides camera calibration using a monoview noncoplanar three dimensional semi-spherical calibration pattern; and wherein values of distortion polynomial coefficients are estimated using three dimensional calibration points distributed on a semi-sphere by formulating the following; - View Dependent Claims (2, 3, 4, 5)
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6. A vision system of a vehicle, said vision system comprising:
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a camera configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle; wherein said camera comprises a pixelated imaging array having a plurality of photosensing elements; an image processor operable to process image data captured by said camera; wherein said vision system provides camera calibration using a monoview noncoplanar three dimensional semi-spherical calibration pattern; and wherein an equal distribution of calibration points having equal angular distance and constant distance to the camera is a preferred point for a value r3 in; - View Dependent Claims (7, 8)
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9. A vision system of a vehicle, said vision system comprising:
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a camera configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle, wherein said camera comprises a fish eye lens; wherein said camera comprises a pixelated imaging array having a plurality of photosensing elements; an image processor operable to process image data captured by said camera; wherein said vision system provides camera calibration using a monoview noncoplanar three dimensional semi-spherical calibration pattern; wherein said camera calibration comprises an estimation of extrinsic parameters and an estimation of intrinsic parameters responsive to determination of the monoview noncoplanar three dimensional calibration pattern distributed on a semi-sphere; and wherein values of distortion polynomial coefficients are estimated using three dimensional calibration points distributed on a semi-sphere by formulating the following; - View Dependent Claims (10, 11, 12)
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13. A vision system of a vehicle, said vision system comprising:
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a camera configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle, wherein said camera comprises a fish eye lens; wherein said camera comprises a pixelated imaging array having a plurality of photosensing elements; an image processor operable to process image data captured by said camera; wherein said vision system provides camera calibration using a monoview noncoplanar three dimensional semi-spherical calibration pattern; wherein said camera calibration comprises an estimation of extrinsic parameters and an estimation of intrinsic parameters responsive to determination of the monoview noncoplanar three dimensional calibration pattern distributed on a semi-sphere; wherein an equal distribution of calibration points having equal angular distance and constant distance to the camera is a preferred point for a value r3 in;
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14. A vision system of a vehicle, said vision system comprising:
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a plurality of cameras configured to be disposed at a vehicle so as to have respective fields of view exterior of the vehicle, wherein at least one camera of said plurality of cameras comprises a fish eye lens; wherein each of said cameras comprises a pixelated imaging array having a plurality of photosensing elements; an image processor operable to process image data captured by said at least one camera; wherein said vision system provides camera calibration of said at least one camera using a monoview noncoplanar three dimensional semi-spherical calibration pattern; and wherein an equal distribution of calibration points having equal angular distance and constant distance to the camera is a preferred point for a value r3 in; - View Dependent Claims (15, 16)
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Specification