ACTIVE FACE SHADE DETECTION IN AUTO SUN-SHADE SYSTEM
First Claim
1. A method for determining a sun-shade line on an object, said method comprising:
- providing subsequent images of the object;
providing a difference image from a subtraction of the subsequent images to remove stationary portions from one image to the next image;
filtering the difference image to remove motion of the object in a horizontal direction to generate a filter response image that includes portions of the subsequent images that move in a vertical direction from the one image to the next image;
thresholding the filter response image to remove the vertical moving portions in the filter response image that do not exceed a predetermined intensity threshold; and
performing a Hough transform on the threshold filter response image to identify a position of the sun-shade line on the object.
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Abstract
A method for identifying a sun-shade line on a vehicle driver'"'"'s face so as to automatically position a sun blocker at the appropriate location to block the sun. The method includes generating subsequent images of the vehicle driver using a low cost camera and providing a difference image from the subsequent camera images to eliminate stationary parts of the image. The method then filters the difference image to enhance the expected motion from the controlled sun blocker and to remove the un-expected motion, which generates a filter response image that includes an identification of the movement of the sun-shade line from image to image. The method then applies a threshold to the filter response image to remove portions of the filter response image that do not exceed a predetermined intensity, and performs a Hough transform on the thresholded filter response image to identify the sun-shade line on the object.
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Citations
20 Claims
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1. A method for determining a sun-shade line on an object, said method comprising:
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providing subsequent images of the object; providing a difference image from a subtraction of the subsequent images to remove stationary portions from one image to the next image; filtering the difference image to remove motion of the object in a horizontal direction to generate a filter response image that includes portions of the subsequent images that move in a vertical direction from the one image to the next image; thresholding the filter response image to remove the vertical moving portions in the filter response image that do not exceed a predetermined intensity threshold; and performing a Hough transform on the threshold filter response image to identify a position of the sun-shade line on the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a sun-shade line on a vehicle driver, said method comprising:
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providing subsequent images of the vehicle driver using a single camera; providing a difference image from a subtraction of the subsequent images to remove stationary portions from one image to the next image; filtering the difference image to remove motion of the object of the vehicle driver in a horizontal direction and enhance expected motion to generate a filter response image that includes portions of the subsequent images that move in a vertical direction from the one image to the next image; multiplying the filter response image by a negative one if movement of the sun-shade line is downward from the one image to the next image that causes a negative identification of the movement of a sun-shade line; thresholding the filter response image to remove the vertical moving portions in the filter response image that do not exceed a predetermined intensity threshold; performing a Hough transform on the thresholded filter response image to identify a position of the sun-shade line on the vehicle driver; and providing false alarm mitigation and tracking of the Hough transformed image to remove line segments in the image that are too short to be the sun-shade line. - View Dependent Claims (12, 13, 14, 15)
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16. A system for determining a sun-shade line on a vehicle driver, said system comprising:
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means for providing subsequent camera images of the vehicle driver; means for providing a difference image from a subtraction of the subsequent camera images to remove stationary portions from one image to the next image; means for filtering the difference image to remove motion of the object of the vehicle driver in a horizontal direction to generate a filter response image that includes portions of the subsequent images that move in a vertical direction from the one image to the next image; means for thresholding the filter response image to remove the vertical moving portions in the filter response image that do not exceed a predetermined intensity threshold; means for performing a Hough transform on the thresholded filter response image to identify a position of the sun-shade line on the vehicle driver; and means for providing false alarm mitigation and tracking of the Hough transformed image to remove line segments in the image that are too short to be the sun-shade line. - View Dependent Claims (17, 18, 19, 20)
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Specification