VEHICLE VISION SYSTEM WITH ENHANCED CAMERA BRIGHTNESS CONTROL
First Claim
1. A vision system for a vehicle, said vision system comprising:
- a camera disposed at a vehicle and having a field of view exterior of the vehicle;
a processor operable to process image data captured by said camera;
a brightness control; and
wherein said brightness control, responsive to image processing of a frame of image data captured by said camera, interpolates towards an expected brightness for a next frame of captured image data by calculating a set of at least three brightness values using three different control coefficients derived from a previous frame of image data captured by said camera, and wherein said brightness control interpolates toward the expected brightness of the next frame of captured image data using the current expected brightness value and two of the three brightness values derived from the three control coefficients derived from the previous frame of captured image data.
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Abstract
A vision system for a vehicle includes a camera disposed at a vehicle and having a field of view exterior of the vehicle. A brightness control, responsive to processing of a frame of image data captured by the camera, interpolates towards an expected brightness for a next frame of captured image data by calculating a set of at least three brightness values using three different control coefficients derived from a previous frame of image data captured by said camera. The brightness control interpolates toward the expected brightness of the next frame of captured image data using the current expected brightness value and two of the three brightness values derived from the three control coefficients derived from the previous frame of captured image data.
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Citations
20 Claims
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1. A vision system for a vehicle, said vision system comprising:
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a camera disposed at a vehicle and having a field of view exterior of the vehicle; a processor operable to process image data captured by said camera; a brightness control; and wherein said brightness control, responsive to image processing of a frame of image data captured by said camera, interpolates towards an expected brightness for a next frame of captured image data by calculating a set of at least three brightness values using three different control coefficients derived from a previous frame of image data captured by said camera, and wherein said brightness control interpolates toward the expected brightness of the next frame of captured image data using the current expected brightness value and two of the three brightness values derived from the three control coefficients derived from the previous frame of captured image data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for adjusting a brightness setting of a camera for a vehicular vision system, said method comprising:
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(a) providing a camera configured to be disposed at a vehicle so as to have a field of view exterior of the vehicle; (b) providing a processor operable to process image data captured by the camera; (c) providing a brightness control operable to control the brightness setting of the camera; (d) capturing a frame of image data by the camera; (e) processing the frame of image data to determine a difference between an actual brightness for the frame and an expected brightness; (f) determining three coefficients derived from the difference between the actual brightness and the expected brightness, wherein at least some of the three coefficients are derived from a previous frame coefficient and a difference between the actual brightness and the expected brightness; (g) applying the three coefficients to the frame of image data to determine three brightness values for the frame, each of the three brightness values derived from a respective one of the three coefficients; (h) interpolating the expected brightness and the three brightness values to determine a frame coefficient that will be used as the previous frame coefficient during processing of a subsequent captured frame of image data; and repeating steps (d) to (h) until the difference between the actual brightness and the expected brightness for a current captured frame of image data is within a threshold range. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A vision system for adjusting a brightness setting of a camera for a vehicular vision system, 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; a brightness control operable to process image data captured by the camera and to control the brightness setting of the camera; wherein, responsive to processing a frame of image data captured by the camera, said brightness control determines a difference between an actual brightness for the frame of captured image data and an expected brightness; wherein said brightness control determines three coefficients based at least in part on the difference between the actual brightness and the expected brightness for that frame of image data captured by the camera; wherein at least some of the three coefficients are derived from a previously determined coefficient determined via processing a previous frame of captured image data; wherein said brightness control applies the three coefficients to a current frame of capture image data to determine three brightness values for the current frame, each of the three brightness values derived from a respective one of the three coefficients; wherein said brightness control interpolates the expected brightness and the three brightness values to determine a current frame coefficient that will be used as a previous frame coefficient during processing of a subsequent captured frame of image data; and wherein said vision system continues to process frames of captured image data until the difference between the actual brightness and the expected brightness for a current captured frame of image data is within a threshold range. - View Dependent Claims (20)
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Specification