VEHICLE SPEED MEASUREMENT METHOD AND SYSTEM UTILIZING A SINGLE IMAGE CAPTURING UNIT
First Claim
1. A vehicle speed measurement method for identifying a violating vehicle, said method comprising:
- capturing a vehicle image utilizing at least one image capturing unit in order to estimate a speed of said vehicle via an automatic license plate recognition unit and thereafter locate and extract license plate character data from said vehicle image;
calculating a license plate distance from said image capturing utilizing a physical character height from a reference point of said image capturing unit and a pixel character height generated by said automatic license plate recognition unit;
generating a ground map that translates a distance of ground from said image capturing unit for each pixel in a field of view of said image capturing unit; and
determining a license plate height from a road surface utilizing a position of said license plate in said field of view in association with said distance information to thereafter accurately estimate said vehicle speed based on said license plate height.
4 Assignments
0 Petitions
Accused Products
Abstract
A vehicle speed measurement method and system for identifying a violating vehicle utilizing single image capturing unit. A vehicle image can be captured by the image capturing unit in order to estimate speed of the vehicle utilizing an ALPR unit. The license plate characters can be located and extracted from the captured image. A distance of the license plate from the image capturing unit can be calculated utilizing a physical character height from a reference point of the image capturing unit and a pixel character height generated by the ALPR unit. A position of the license plate in the field of view of the image capturing unit along with the distance information can be be utilized to determine a height of the license plate from a road surface. The height of the license plate can be employed to accurately estimate the vehicle speed.
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Citations
20 Claims
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1. A vehicle speed measurement method for identifying a violating vehicle, said method comprising:
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capturing a vehicle image utilizing at least one image capturing unit in order to estimate a speed of said vehicle via an automatic license plate recognition unit and thereafter locate and extract license plate character data from said vehicle image; calculating a license plate distance from said image capturing utilizing a physical character height from a reference point of said image capturing unit and a pixel character height generated by said automatic license plate recognition unit; generating a ground map that translates a distance of ground from said image capturing unit for each pixel in a field of view of said image capturing unit; and determining a license plate height from a road surface utilizing a position of said license plate in said field of view in association with said distance information to thereafter accurately estimate said vehicle speed based on said license plate height. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A speed measurement system for identifying a violating vehicle, said system comprising:
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a processor; and a computer-usable medium embodying computer program code, said computer-usable medium being coupled to said data bus, said computer program code comprising instructions executable by said processor and configured for; capturing a vehicle image utilizing at least one image-capturing unit in order to estimate a speed of said vehicle via an automatic license plate recognition unit and thereafter locate and extract license plate character data from said vehicle image; calculating a license plate distance from said image capturing utilizing a physical character height from a reference point of said image capturing unit and a pixel character height generated by said automatic license plate recognition unit; generating a ground map that translates a distance of ground from said image capturing unit for each pixel in a field of view of said image capturing unit; and determining a license plate height from a road surface utilizing a position of said license plate in said field of view in association with said distance information to thereafter accurately estimate said vehicle speed based on said license plate height. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A processor-readable medium storing code representing instructions to cause a processor to perform a process of vehicle speed measurement for identifying a violating vehicle, said code comprising code to:
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capture a vehicle image utilizing at least one image-capturing unit in order to estimate a speed of said vehicle via an automatic license plate recognition unit and thereafter locate and extract license plate character data from said vehicle image; calculate a license plate distance from said image capturing utilizing a physical character height from a reference point of said image capturing unit and a pixel character height generated by said automatic license plate recognition unit; generate a ground map that translates a distance of ground from said image capturing unit for each pixel in a field of view of said image capturing unit; and determine a license plate height from a road surface utilizing a position of said license plate in said field of view in association with said distance information to thereafter accurately estimate said vehicle speed based on said license plate height. - View Dependent Claims (20)
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Specification