Vehicle speed verification system and method
AssigneeRedflex Traffic Systems Pty Ltd
InventorsAndrew Rowsell, Sime Mardesic
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Abstract
A method of assessing the speed of a vehicle including the steps of obtaining a first image of a vehicle; obtaining a second image of the vehicle captured at a known time after capture of the first image; selecting a reference point on the vehicle in the first image; and indicating a location in the second image corresponding to a predicted location of the selected vehicle reference point assuming that the vehicle travels at a particular speed between the times of capture of the first and second images.
Claims22
A method of verifying speed of a vehicle to provide independent verification of speed detected by a primary speed assessment system, said primary speed assessment system using a primary speed detector to detect speed of said vehicle, said method using a secondary speed assessment system independent of said primary speed detector, said method including:
- obtaining, using said secondary speed assessment system, first and second images of said vehicle, said second image being captured at a known time after said first image is captured;
- selecting a reference point on said vehicle in said first image;
- determining a location in said second image corresponding to an expected location of the selected reference point, based on the speed detected by the primary speed assessment system within a set percentage of the speed detected by the primary speed assessment system, in the time period between the capturing of said first and second images;
- and
- comparing an actual location of said reference point in said second image with the expected location, such that if the actual location corresponds to the expected location, it may be concluded that the vehicle was travelling at the speed detected by the primary speed assessment system.
A speed verification system for providing independent verification of speed detected by a primary speed assessment system, said primary speed assessment system using a primary speed detector to detect speed of a vehicle, said speed verification system using a secondary speed assessment system independent of said primary speed detector, said verification system including:
- capturing means using said secondary speed assessment system for obtaining first and second images of said vehicle, said second image being captured a known time after said first image is captured;
- selecting means for selecting a reference point on said vehicle in said first image;
- determining means for determining a location in said second image corresponding to an expected location of the selected reference point, based on the speed detected by the primary speed assessment system within a set percentage of the speed detected by the primary speed assessment system, in the time period between the capturing of said first and second images, and
- comparing means for comparing an actual location of said reference point in said second image with the expected location such that if the actual location corresponds to the expected location, it may be concluded that the vehicle was travelling at the speed detected by the primary speed assessment system.
Dependencies are inferred from the claim text.