Collision warning system
First Claim
Patent Images
1. A method of estimating a time-to-collision (TTC) of a vehicle with an object using a system including a camera and a processor mountable in a motor vehicle the method comprising:
- acquiring from the camera a plurality of images of the object at known time intervals;
determining a relative scale of the object in the images;
determining a function of relative velocity and relative acceleration between the vehicle and the object from the relative scale and die time intervals; and
determining the time-to-collision (TTC) based on the function of the relative velocity and the relative acceleration.
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Accused Products
Abstract
A method of estimating a time to collision (TTC) of a vehicle with an object comprising: acquiring a plurality of images of the object; and determining a TTC from the images that is responsive to a relative velocity and relative acceleration between the vehicle and the object.
161 Citations
15 Claims
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1. A method of estimating a time-to-collision (TTC) of a vehicle with an object using a system including a camera and a processor mountable in a motor vehicle the method comprising:
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acquiring from the camera a plurality of images of the object at known time intervals; determining a relative scale of the object in the images; determining a function of relative velocity and relative acceleration between the vehicle and the object from the relative scale and die time intervals; and determining the time-to-collision (TTC) based on the function of the relative velocity and the relative acceleration. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for estimating a time-to-collision collision, the system including a camera and a processor mountable in a motor vehicle, the system operable to:
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acquire from the camera a plurality of images of the object at known time intervals; determine a relative scale of the object in the images; determine a function of relative velocity and relative acceleration between the vehicle and the object from the relative scale and the time intervals; and determine the time-to-collision (TTC) based on the function relative velocity and the relative acceleration. - View Dependent Claims (9, 10, 11, 12)
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13. A system for alerting a driver to a possible collision with an object, the system comprising:
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a camera and a processor mountable in a motor vehicle, the system operable to; acquire a plurality of images of the object at known time intervals; determine the time-to-collision (TTC) based on data from the images and the time intervals; and determine motion of at least two features of the object relative to the vehicle from the images; and determine from the relative motions at the time-to-collision, if the real space horizontal coordinates of said at least two features straddle the real-space horizontal coordinate of at least a part of the vehicle. - View Dependent Claims (14, 15)
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Specification