Method for locating license plate under a complicated background

A technology for license plate positioning and complex background, which is applied in the field of license plate positioning and can solve the problems of inability to adapt to complex backgrounds, poor reliability, and many color losses.

Inactive Publication Date: 2009-04-15
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantages of the existing license plate positioning methods that cannot adapt to complex backgrounds, poor reliability, and more color loss, the present invention provides a license plate positioning method that adapts to complex ...

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  • Method for locating license plate under a complicated background
  • Method for locating license plate under a complicated background
  • Method for locating license plate under a complicated background

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Embodiment Construction

[0066] The present invention will be further described below in conjunction with the accompanying drawings.

[0067] refer to Figure 1 to Figure 5 , a license plate location method in a complex background, including the following steps:

[0068] 1) Intercept two adjacent frames in the vehicle video, use the improved instantaneous difference method, in order to meet the real-time requirements, design a fixed size (such as 3×3) range centered on the point as the difference area, and take the gray area of ​​this area Calculate the difference of degree mean value, filter and expand the difference image, filter and locate the car body according to the area of ​​the circumscribed rectangle of the connected domain;

[0069] 2) Preprocessing the image of the car body area, mainly including grayscale of the car body image, enhancement of gradient information, and binarization using the average plus standard deviation as the threshold to improve image quality;

[0070] 3) Perform mat...

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Abstract

The invention discloses a method for locating a vehicle license plate in complex background. The method comprises the following steps: (1). Differentiating a gray scale mean of a fixed-size region and extracting a vehicle body image from a video; (2). preprocessing the vehicle body image such as gradation, gradient information enhancing, binarization and the like; (3). performing mathematical morphology operation on the processed vehicle body image, and performing primary screening by combining structural features of the vehicle license plate to obtain a plurality of candidate vehicle license plate regions; (4). converting the obtained candidate vehicle license plate regions into an HSV color spatial image; (5). adopting a BP neural network to perform color identification on the HSV color spatial candidate vehicle license plate image, and performing color edge detection by computing the mean color distance between two adjacent regions of a certain pixel; (6). judging edge color pair of an edge point, and eliminating the false vehicle license plate edge; and (7). performing final vehicle license plate location by the texture feature of the vehicle license plate. The method is suitable for complex background, and has higher location accuracy rate and higher robustness.

Description

technical field [0001] The invention relates to a license plate positioning technology, in particular to a license plate positioning method under a complicated background. Background technique [0002] At present, many cities in my country have established traffic control centers, and video surveillance has become the main means of traffic management, which also means that License Plate Recognition (LPR) technology will play an increasingly important role. Automatic license plate recognition system can be widely used in the following occasions: highway, bridge, tunnel and other toll management systems; urban traffic vehicle management, electronic police, customs border traffic monitoring; intelligent community, intelligent parking lot management; license plate verification, traffic statistics, etc. Using this technology in the above occasions can realize real-time and efficient monitoring of vehicle dynamics, making it possible to realize functions such as non-stop charging,...

Claims

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Application Information

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IPC IPC(8): G06K9/46G06K9/00G06T7/00
Inventor 朱信忠赵建民徐慧英俞伟广胡承懿
Owner ZHEJIANG NORMAL UNIVERSITY
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