Vehicle license plate location method based on character position

A character position and license plate positioning technology, applied in character and pattern recognition, image data processing, instruments, etc., can solve the problems of being greatly affected by light and low positioning accuracy

Inactive Publication Date: 2016-04-27
JIANGSU XINGZE IND DEV
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  • Summary
  • Abstract
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  • Application Information

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 used

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  • Vehicle license plate location method based on character position
  • Vehicle license plate location method based on character position
  • Vehicle license plate location method based on character position

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Embodiment Construction

[0061] This embodiment is a preferred implementation mode of the present invention, and other principles and basic structures that are the same or similar to this embodiment are within the protection scope of the present invention.

[0062] In the present invention, in order to improve efficiency, the image after down-sampling is all processed before the license plate is carried out inclination correction, so the whole license plate positioning steps are as follows (please refer to the attached figure 1 ):

[0063] Step S1: In order to improve the efficiency of the algorithm, the RGB image in the ROI area is first down-sampled every K pixels, and the width of the ROI is roughly the width of a lane;

[0064]Step S2: In order to improve the stability of the algorithm, classify the illumination conditions, and perform different image preprocessing methods, ie adaptive preprocessing methods. The adaptive preprocessing method in this embodiment: in order to adapt to different ligh...

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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...

Claims

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Application Information

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IPC IPC(8): G06K9/62G06K9/54G06T7/00
Inventor 李静立李战斌李赫刘中奎林苏鹏
Owner JIANGSU XINGZE IND DEV
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