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License plate positioning method

A technology of license plate positioning and license plate area, which is applied in the field of target recognition to achieve high accuracy, improve positioning accuracy, and improve the effect of positioning speed

Inactive Publication Date: 2017-06-13
INST OF BIG DATA RES AT YANCHENG OF NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a license plate location method, which not only solves the problem of license plate location in complex environments, but also improves Accuracy of license plate location

Method used

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Embodiment Construction

[0029] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] A license plate location method, such as figure 1 shown, including the following steps:

[0031] Step 1: Collect the vehicle image, remove the image noise by Gaussian blur, and sharpen the image to highlight the corners.

[0032] Step 2: Use a corner detector to locate corners on the image.

[0033] (a) Define the image collected in step 1 as I, the (x, y) pixel on the image as I(x, y), set the moving distance (u, v), and calculate the maximum value of the pixel brightness change in the moved area :

[0034]

[0035] (b) Perform Taylor expansion on E(u,v):

[0036]

[0037] In the above formula, I x , I y is the partial derivative of I in the direction of x-axis and y-axis;

[0038] (c) order Compute the eigenvalues ​​λ of M 1 ,λ 2 ;

[0039] (d) Calculate R=λ 1 lambda 2 -k(λ 1 -λ 2 ) 2 , k is a constant, if R≥...

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Abstract

The invention discloses a license plate positioning method. The license plate positioning method comprises the steps that a vehicle image is preprocessed firstly, noisy points are removed, and sharpening is performed; then, a zone having more angular points in the image is detected to determine a candidate license plate zone; finally, a predicted license plate zone is screened out from the candidate license plate zone through a convolutional neural network. By adopting the license plate positioning method in which angular point detection and convolutional neural network are combined, the license plate positioning problem in a complicated environment is solved, and the license plate positioning accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of target recognition, and in particular relates to a license plate positioning method. Background technique [0002] With the rapid development of intelligent transportation, license plate recognition technology is widely used in parking management, traffic control management and vehicle tracking systems, so the requirements for license plate recognition are also increasing. As a key part of license plate recognition, license plate location directly affects the accuracy of the license plate recognition system. The traditional license plate positioning method used in license plate recognition is greatly reduced in low light or other complex environments, which directly leads to a decline in the accuracy of license plate recognition. [0003] At present, the license plate location method can be divided into two types according to the content of the detection. One is the license plate location method based on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/40G06K9/46G06T5/00G06N3/08G08G1/017
CPCG06N3/08G08G1/017G06T2207/30236G06V10/245G06V10/30G06V10/44G06V20/625G06T5/92G06T5/73
Inventor 吴智钧孙知信宫婧骆冰清
Owner INST OF BIG DATA RES AT YANCHENG OF NANJING UNIV OF POSTS & TELECOMM
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