Passive single camera imaging system for determining motor vehicle speed
First Claim
1. A system for passively determining a speed of moving vehicles, comprising:
- an imaging device for acquiring images of a moving vehicle on a vehicle pathway and a fixed object proximate to the moving vehicle, the fixed object defining a first plane that intersects an adjacent portion of the vehicle pathway, wherein no geometric length of the vehicle is known a priori; and
a processor operable to receive data associated with the images and determine a speed of the moving vehicle in the images, wherein the processor estimates a geometric length of the vehicle based on applying homography using the images, and wherein the processor determines a speed of the moving vehicle from the images and the estimated geometric length using a velocity estimation method.
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Accused Products
Abstract
A system for passively determining a speed of moving vehicles includes a single imaging device (103) for acquiring a plurality of images at a first time and at least at one second later time, wherein each image includes a moving vehicle (406) on a vehicle pathway (402) and at least one fixed object (404) proximate to the vehicle, defining a first plane (π1) intersecting an adjacent portion of the vehicle pathway (402), wherein no geometric lengths of the vehicle (406) are known a priori. The system can also include a processor (121) operable to receive data associated with the images and determine a speed of the vehicle (406) in the images, wherein the processor (121) estimates at least one geometric length of the vehicle (406) by applying homography using the plurality of images, and where the processor (121) determines a speed of the vehicle (406) from the plurality of images and the estimated geometric length using a velocity estimation method.
14 Citations
22 Claims
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1. A system for passively determining a speed of moving vehicles, comprising:
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an imaging device for acquiring images of a moving vehicle on a vehicle pathway and a fixed object proximate to the moving vehicle, the fixed object defining a first plane that intersects an adjacent portion of the vehicle pathway, wherein no geometric length of the vehicle is known a priori; and a processor operable to receive data associated with the images and determine a speed of the moving vehicle in the images, wherein the processor estimates a geometric length of the vehicle based on applying homography using the images, and wherein the processor determines a speed of the moving vehicle from the images and the estimated geometric length using a velocity estimation method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 18, 19)
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9. A method for passively determining a speed of moving vehicles, comprising:
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acquiring images of a moving vehicle on a vehicle pathway and a fixed object proximate to the moving vehicle that defines a first plane which intersects an adjacent portion of the vehicle pathway, wherein no geometric length of the vehicle is known a priori; estimating a geometric length of the vehicle based on applying homography using the images of the vehicle; and determining a speed of the moving vehicle from the images and the geometric length using a velocity estimation method. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 20, 21, 22)
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Specification