Method for precise positioning of license plate in strong light conditions

A precise positioning and license plate technology, applied in the field of image processing, can solve problems such as inability to accurately locate and interfere, and achieve the effect of improving positioning accuracy

Active Publication Date: 2012-09-26
THE THIRD RES INST OF MIN OF PUBLIC SECURITY
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the existing license plate positioning method cannot accurately locate the license plate under the strong light strip, and provides a method for the precise posit

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  • Method for precise positioning of license plate in strong light conditions
  • Method for precise positioning of license plate in strong light conditions
  • Method for precise positioning of license plate in strong light conditions

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Embodiment Construction

[0045] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0046] The method for accurately locating the license plate under the background of strong light proposed by the present invention combines various methods such as edge detection, morphological operation, connected domain analysis, and adaptive median filter analysis. The specific process is as follows (see image 3 ):

[0047] 1. Adaptive median filtering improved algorithm for image preprocessing

[0048] First read the license plate image to be processed. If the image is a color image, convert it to a grayscale image. The formula for converting a color image to a grayscale image is:

[0049] Gray=0.3R+0.59G+0.11B

[0050] After the color image is grayscaled, the adaptive median filter algorithm is applied to filter out the noise of the gray...

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Abstract

The invention discloses a method for precise positioning of a license plate in strong light conditions. The method comprises the following steps: (1) using the picture of a license plate to be processed to conduct preprocessing by self-adaptive median filtering; (2) using a differential operator to conduct edge detection of the license plate; (3) converting an image after the edge detection to a binary edge image; (4) de-nosing the binary edge image in a morphological manner and forming a plurality of communicated regions; (5) performing morphological processing on the communicated regions; and (6) positioning the region of the license plate according to the results of the communicated regions. The method for precise positioning of a license plate in strong light conditions can effectively solve the problem of interference to the positioning of the license plate under irradiation of strong light, enable the positioning accuracy to be improved, and is applicable for extracting license plates of passing vehicles from pictures taken at places such as a flowing speed measurement point or a crossroad.

Description

technical field [0001] The invention relates to an image processing technology, in particular to a positioning technology for automatic license plate recognition. Background technique [0002] Due to the influence of weather, light, pollution and other factors in complex backgrounds, the contrast characteristics of the collected license plate images are often not ideal; especially when the car headlights are turned on at night or the license plate is reflected by strong sunlight during the day, the license plate information is lost , license plate location is more difficult. Therefore, the quality of image preprocessing directly affects the accuracy of license plate location. [0003] At present, people have proposed many processing methods for the image preprocessing of license plate location. Although various preprocessing methods for license plate location have certain practicality and reference value, especially when the vehicle is located in the background of strong li...

Claims

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Application Information

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IPC IPC(8): G06K9/20G06K9/46G06K9/54
Inventor 汤志伟梅林齐力杨明江洪沈冬青李万才李震宇
Owner THE THIRD RES INST OF MIN OF PUBLIC SECURITY
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