Vehicle license plate location method based on character position

Abstract

The invention discloses a vehicle license plate location method based on a character position. The method comprises a first step of image down sampling in which down sampling operation for every K pixels is carried out on an RGB image in an ROI area, and the width of the ROI is roughly the width of a lane, a second step of image pretreatment in which the environment is roughly judged according to an original image and a different pretreatment mode is carried out on a different illumination condition, a third step of rough vehicle license plate location, a fourth step of fine vehicle license plate location, a fifth step of acquiring the position of the vehicle license plate in the original image according to the down sampling parameter K and the position of a candidate vehicle license plate when mapping of the vehicle license plate is carried out, carrying out mapping on a left position of the first English alphabet and acquiring the position in the original image, and a sixth step of vehicle license plate inclination correction in which correction pretreatment is firstly carried out on the vehicle license plate when vehicle license plate inclination correction is carried out, the position of a red character in the vehicle license plate is then judged, horizontal correction and vertical correction are carried out, and correction post-treatment is finally carried out.

Description

technical field [0001] The invention discloses a license plate positioning method, in particular a character position-based license plate positioning method. Background technique [0002] Due to the rapid economic development of our country in recent decades, on the one hand, the total number of vehicles has become larger and larger. While becoming the main means of transportation in modern society, people's awareness of vehicle information collection and management has become stronger and stronger, while manual collection and Management has been unable to meet the actual needs; on the other hand, with the rapid development of computer technology, machine vision, communication technology, etc., they provide reliable technical support for intelligent transportation. [0003] License plate recognition is one of the important components of modern intelligent transportation systems, and it is widely used. License plate positioning technology is often used as a part of license pl...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the disadvantages of low positioning accuracy and great influence of light in the above-mentioned license plate positioning technology in the prior art, the present invention provides a character position-based license plate positioning method, which uses image down-sampling and image preprocessing , license plate rough positioning, license plate fine positioning, original image mapping, license plate tilt correction and other steps to finally obtain the correct license plate position

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