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A license plate location method in complex background

A license plate location and complex background technology, applied in the field of license plate location, can solve the problems of strong interference of license plate features, difficult to locate correctly, etc., and achieve the effect of high accuracy of results, easy implementation, and small amount of calculation

Inactive Publication Date: 2018-11-09
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a license plate location method in a complex background, which solves the problem in the prior art that due to the posture of the vehicle in the image and the diversity of the environment, the license plate features are in a strong interference environment and it is difficult to locate correctly question

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  • A license plate location method in complex background
  • A license plate location method in complex background
  • A license plate location method in complex background

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] The license plate location method under the complicated background of the present invention, specifically implement according to the following steps:

[0027] Step 1. Preprocessing

[0028] refer to figure 1 , the input is a color original image of size m×n captured by a surveillance camera or a handheld camera device. In the original image, the three colors of red, green, and blue are respectively marked as R=[r(i,j)] m×n , G=[g(i,j)] m×n , B=[b(i,j)] m×n , i=1,2,...,m, j=1,2,...,n,

[0029] Brightness value L=[l(i,j)] m×n for:

[0030] l(i,j)=0.299 r(i,j)+0.587 g(i,j)+0.114 b(i,j), (1)

[0031] The average brightness is:

[0032]

[0033] Step 2, obtain the candidate license plate template in the original image

[0034] According to the "People's Republic of China Public Safety Industry Standard" GA36-2007, there are curr...

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Abstract

The invention discloses a method for locating a license plate under a complex background. The steps include: step 1, preprocessing; step 2, obtaining a candidate license plate template in the original image; step 3, finding the effective number font part of the license plate; step 4, Find the background color and font color jump part of the license plate to obtain the license plate template; step 5, eliminate noise on the license plate template; step 6, perform expansion calculation on the license plate template; step 7, locate the license plate; step 8, output the license plate information, and it is ready . The method of the present invention is suitable for complex environments where there are many disturbances in images captured by surveillance cameras or handheld camera equipment, the steps are simple, easy to implement, the amount of calculation is small, and the accuracy of the results is high. position.

Description

technical field [0001] The invention belongs to the technical field of intelligent traffic monitoring video processing, and relates to a license plate positioning method under a complicated background. Background technique [0002] The license plate is the abbreviation of the car number plate. It is the legal certificate for the permission of the car to drive on the road. For this reason, in the intelligent traffic monitoring system, the automatic recognition of the license plate is an important means to find the certificate of the car of concern. At present, for parking lot entrances and exits, toll booths, and bayonet mode, the resolution of the vehicles in the snapshots is large enough, the vehicle posture is relatively fixed, and the license plate information is clear enough to achieve correct recognition. However, for the situation where the position of the camera and the shooting vehicle is not fixed, such as the video frame image of the driving vehicle collected by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V20/584G06V20/625
Inventor 朱虹卫永波谢凡凡权甲白帅
Owner XIAN UNIV OF TECH