Method and apparatus for calibrating an image capturing device, and a method and apparatus for outputting image frames from sequentially captured image frames with compensation for image capture device offset
First Claim
1. A method for calibrating an output of an image capture device mounted on a vehicle to compensate for offset of the image capture device from an ideal position, the method comprising:
- reading digital data representative of an image frame captured by the image capture device,determining the actual position in the image frame of a reference element captured in the image frame,determining an offset error value of the actual position of the reference element in the captured image frame from an ideal position of the reference element in a corresponding ideal image frame, andproducing an offset correction transformation function in response to the determined offset error value for correcting image frames subsequently captured by the image capture device to produce image frames with compensation for the offset of the image capture device.
2 Assignments
0 Petitions
Accused Products
Abstract
A camera (17) mounted on a rear view minor housing (5) of a vehicle (1), which captures a plan view image of the ground on one side of the vehicle for display on an in-vehicle visual display unit (13) is calibrated to correct for offset of the camera (17) from an ideal position. During calibration an image of a reference point (34) on the vehicle (1) is captured as the mirror housing (5) is swiveled from a rest position to an operative position. The offset of the actual position of the image of the reference point in the captured image from its ideal position is computed, and a look-up table is prepared, which indicates the position at which pixels of subsequently captured image frames should be located to produce image frames with offset correction.
101 Citations
25 Claims
-
1. A method for calibrating an output of an image capture device mounted on a vehicle to compensate for offset of the image capture device from an ideal position, the method comprising:
-
reading digital data representative of an image frame captured by the image capture device, determining the actual position in the image frame of a reference element captured in the image frame, determining an offset error value of the actual position of the reference element in the captured image frame from an ideal position of the reference element in a corresponding ideal image frame, and producing an offset correction transformation function in response to the determined offset error value for correcting image frames subsequently captured by the image capture device to produce image frames with compensation for the offset of the image capture device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A calibration system for calibrating an output of an image capture device mounted on a vehicle to compensate for offset of the image capture device from an ideal position, the system comprising:
-
a reading means for reading digital data representative of an image frame captured by the image capture device, a means for determining the actual position in the captured image frame of a reference element in the captured image frame, a means for determining an offset error value of the actual position of the reference element in the captured image frame from an ideal position of the reference element in a corresponding ideal image frame, and a means for producing an offset correction transformation function from the determined offset error value for correcting image frames subsequently captured by the image capture device to produce image frames with compensation for the offset of the image capture device. - View Dependent Claims (14, 15, 16, 17, 18, 19)
-
-
20. A method for sequentially producing a plurality of output image frames derived from respective corresponding captured image frames captured by an image capture device mounted on a vehicle with the output image frames including compensation for offset of the image capture device from an ideal position, the method comprising:
-
sequentially reading digital data representative of the respective captured image frames, determining appropriate locations at which at least some of the pixels in each captured image frame should be located in the corresponding output image frame based on calibration data to compensate for the offset of the image capture device, and constructing each output image frame with the pixels therein corresponding to the at least some of the pixels of the corresponding captured image frame located in the determined appropriate locations, the calibration data being derived from a method for calibrating the image capture device comprising; reading digital data representative of an image frame captured by the image capture device, determining the actual position in the image frame of a reference element captured in the image frame, determining an offset error value of the actual position of the reference element in the captured image frame from an ideal position of the reference element in a corresponding ideal image frame, and producing an offset correction transformation function in response to the determined offset error value for correcting image frames subsequently captured by the image capture device to produce image frames with compensation for the offset of the image capture device. - View Dependent Claims (21, 22)
-
-
23. An image vision system for sequentially producing a plurality of output image frames derived from corresponding captured image frames captured by an image capture device mounted on a vehicle with the output image frames including compensation for offset of the image capture device from an ideal position, the image vision system comprising a reading means for reading digital data representative of the respective captured image frames, a means for determining appropriate locations at which at least some of the pixels in each captured image frame should be located in the corresponding output image frame based on calibration data to compensate for the offset of the image capture device, and a means for constructing each output image frame with the pixels therein corresponding to at least some of the pixels of the corresponding captured image frame located in the determined appropriate locations, the calibration data being derived from a method for calibrating the image capture device, the method comprising:
-
reading digital data representative of an image frame captured by the image capture device, determining the actual position in the image frame of a reference element captured in the image frame, determining an offset error value of the actual position of the reference element in the captured image frame from an ideal position of the reference element in a corresponding ideal image frame, and producing an offset correction transformation function in response to the determined offset error value for correcting image frames subsequently captured by the image capture device to produce image frames with compensation for the offset of the image capture device. - View Dependent Claims (24, 25)
-
Specification