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Character overall feature-based rapid number plate verification method

A technology of overall features and verification methods, applied in character and pattern recognition, image data processing, instruments, etc., to achieve the effect of high traffic speed, improved verification speed, and small amount of equipment renovation

Inactive Publication Date: 2012-09-19
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Most of the existing license plate image verification methods adopt the method of direct license plate recognition, which has not solved the problem of time-consuming and has not been adopted by the ETC standard.

Method used

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  • Character overall feature-based rapid number plate verification method
  • Character overall feature-based rapid number plate verification method
  • Character overall feature-based rapid number plate verification method

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] Features such as circles and concave areas in the image are called the concave-convex features of the image, and the concave-convex features are the overall characteristics of the character image. The character image concavity feature extraction method includes the following two steps: (1) Calculate the assigned background. For the background point of the character image (the point with a pixel value of 0 in the binarized image), starting from this point, send 8 rays in 8 directions: right, upper right, upper, upper left, left, lower left, lower, lower right, The number of rays intersecting with the foreground point (character) is the assignment of the background point. (2) Extract unevenness. Circles and sunken ...

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Abstract

The invention discloses a character overall feature-based rapid number plate verification method, which comprises the following steps of: performing number plate extraction and number plate character division on an input static color vehicle image; calculating a background field assigned value of a number plate character image, and extracting the convex and concave features of the character image; verifying number plate information to be verified by using the convex and concave features of the number plate character image to obtain a verification result of each character; and combining the verification results of the number plate characters by using a decision fusion technology, and judging the accurate of the number plate information to be verified. Direct number plate character recognition is avoided, the image is not required to be complexly preprocessed, and the method is high in recognition rate and recognition speed, and can be reliably used for vehicle identity legality identification.

Description

technical field [0001] The invention relates to the technical field of license plate verification, in particular to a verification method and system for quickly and accurately confirming the legality of vehicles to be traded in intelligent transportation. Background technique [0002] Electronic Toll Collection (ETC) is an electronic toll collection technology applied to roads, bridges and tunnels that is being promoted internationally. The most effective means to solve the problem of toll booth congestion. The standard ETC system relies on the microwave communication between the vehicle and the toll booth to realize automatic vehicle identification. The widely researched automatic license plate recognition technology based on image capture has not been adopted due to its low recognition rate and long recognition time. [0003] When the ETC is working normally, the on-board unit (On-Board Unit, OBU, which stores information related to the vehicle identity) installed on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06T7/00
Inventor 鲁华祥王亮景为平
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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