PASSIVE SINGLE CAMERA IMAGING SYSTEM FOR DETERMINING MOTOR VEHICLE SPEED
First Claim
1. A system for passively determining a speed of moving vehicles, comprising:
- a single imaging device for acquiring a plurality of images at a first time and at least at one second later time, wherein each of said images includes a moving vehicle on a vehicle pathway and at least one fixed object proximate to said moving vehicle defining a first plane which intersects an adjacent portion of said vehicle pathway, wherein no geometric length of said vehicle is known a priori; and
a processor operable to receive data associated with said plurality of images and determine a speed of said moving vehicle in said images, wherein said processor estimates at least one geometric length of said vehicle based on applying homography using said plurality of images of said vehicle at said first and said at least one second later time, and wherein said processor determines a speed of said moving vehicle from said plurality of images and said 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.
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Citations
16 Claims
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1. A system for passively determining a speed of moving vehicles, comprising:
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a single imaging device for acquiring a plurality of images at a first time and at least at one second later time, wherein each of said images includes a moving vehicle on a vehicle pathway and at least one fixed object proximate to said moving vehicle defining a first plane which intersects an adjacent portion of said vehicle pathway, wherein no geometric length of said vehicle is known a priori; and a processor operable to receive data associated with said plurality of images and determine a speed of said moving vehicle in said images, wherein said processor estimates at least one geometric length of said vehicle based on applying homography using said plurality of images of said vehicle at said first and said at least one second later time, and wherein said processor determines a speed of said moving vehicle from said plurality of images and said estimated geometric length using a velocity estimation method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15, 16)
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9. A method for passively determining a speed of moving vehicles, comprising:
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acquiring a plurality of images at a first time and at least at one second later time using a single imaging device, wherein each of said images includes a moving vehicle on a vehicle pathway and at least one fixed object proximate to said moving vehicle defining a first plane which intersects an adjacent portion of said vehicle pathway, wherein no geometric length of said vehicle is known a priori; estimating at least one geometric length of said vehicle based on applying homography using said plurality of images of said vehicle at said first and said at least one second later time; and determining a speed of said moving vehicle from said plurality of images and said geometric length using a velocity estimation method. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification