Method for identifying objects in motion, in particular vehicles, and systems for its implementation
First Claim
1. Method for identifying an object (3) in motion, in particular a vehicle, said object moving inside a predetermined identification zone (2) following a predetermined movement axis (A), which method comprises the steps of:
- acquiring periodically images (52) in a predetermined field of view (26), essentially vertical and of a width narrower than its height, said field of view (26) cutting the identification zone (2) at a predetermined angle of intersection and defining an observation plane,checking nature of image background in the field of view (26), to obtain background reference information in absence of the object (3) in the field of view (26), andprocessing the images (52) acquired in combination with the background reference information, to extract therefrom a silhouette of the object (3) having crossed the field of view (26).
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Accused Products
Abstract
A method for identifying an object in motion, in particular a vehicle, includes several steps whenever the object is moving inside a predetermined identification zone following a predetermined movement axis. The steps are periodically acquiring images of the object in a predetermined field of view, checking the nature of the image background in the field of view to obtain background reference information in the absence of the object, and processing the images acquired in combination with the background reference information in order to extract therefrom a silhouette of the object having crossed the field of view. Systems for implementing the method are also disclosed. The invention may be used, in particular, with highway toll booths and for any other application demanding an identification of vehicles.
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Citations
33 Claims
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1. Method for identifying an object (3) in motion, in particular a vehicle, said object moving inside a predetermined identification zone (2) following a predetermined movement axis (A), which method comprises the steps of:
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acquiring periodically images (52) in a predetermined field of view (26), essentially vertical and of a width narrower than its height, said field of view (26) cutting the identification zone (2) at a predetermined angle of intersection and defining an observation plane, checking nature of image background in the field of view (26), to obtain background reference information in absence of the object (3) in the field of view (26), and processing the images (52) acquired in combination with the background reference information, to extract therefrom a silhouette of the object (3) having crossed the field of view (26). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. System (1, 20, 90) for identifying an object (3) in motion, in particular a vehicle, said object (3) moving inside a predetermined identification zone (2) following a predetermined axis of movement (A), which system comprises:
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means (4) for periodically acquiring images in a predetermined field of view (26), essentially vertical and of a width narrower than its height, said field of view (26) cutting the identification zone (2) at a predetermined angle of intersection and defining an observation plane, means (5, 6, 9,
10) for checking nature of an image background in the field of view (26) with an aim of obtaining background reference information, andmeans (7) for processing the images acquired in combination with the background reference information, and for extracting therefrom a silhouette of the object (3) having crossed the observation plane. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification