Motor vehicle license plate image inclination angle correction system and method based on least square method and coordinate rotation

Abstract

The invention provides a motor vehicle license plate image inclination angle correction system based on a least square method and coordinate rotation. The motor vehicle license plate image inclinationangle correction system comprises an edge calculation unit, an inclination angle calculation unit and a rotation calculation unit. The edge calculation unit is used for calculating edge pixel pointsof the bullet train license plate image. The inclination angle calculation unit is used for calculating the bullet train license plate image inclination angle. The rotation calculation unit is used for correcting the inclined motor vehicle license plate image to be straight. The edge calculation unit comprises motor vehicle license plate image edge detection and motor vehicle license plate image detection area determination. The inclination angle calculation unit comprises the steps of selecting a motor vehicle license plate image inclination angle calculation sample, and calculating a motor vehicle license plate image inclination angle. The rotation calculating unit comprises a motor vehicle license plate image rotating positively and a motor vehicle license plate image rotating negatively. According to the invention, the identification accuracy of the vehicle license plate can be improved. The functional performance of the traffic technology monitoring equipment is further improved.

Description

technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a system and method for correcting the inclination angle of a motor vehicle license plate image based on the least square method and coordinate rotation. Background technique [0002] In my country, the motor vehicle license plate is a legal symbol registered by the public security traffic control department to allow motor vehicles to drive on the roads in the People's Republic of China. The earliest motor vehicle number plate in my country appeared in the 27th year of Guangxu in the Qing Dynasty. After the founding of New China, it underwent many changes and became the "92-type" motor vehicle number plate in use today. The industry technical standard is "Motor Vehicles of the People's Republic of China" "Number Plates" (GA36), the standard clearly stipulates the classification, specifications, colors, scope of application, style, technical requirements and othe...

AI Technical Summary

Problems solved by technology

However, in reality, the mounting rod of the camera is often affected by the cumulative vibration of the roadbed due to wind blowing or vehicle driving, and the mounting rod of the camera is often slightly displaced, causing the image of the vehicle license plate to be tilted, which has an adverse effect on the recognition results of the license plate characters

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