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License plate positioning method in complex background image shot on the basis of handheld terminal

A technology with complex background and hand-held terminal, applied in instruments, character and pattern recognition, computer parts, etc., it can solve the problem of difficult license plate positioning, and achieve the effect of solving the difficulty of license plate positioning, improving computing efficiency and application scope.

Active Publication Date: 2017-05-31
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for locating license plates in complex background images based on hand-held terminals for the difficult problem of locating license plates in complex backgrounds, which improves the calculation efficiency and application range of locating license plates and achieves accurate position

Method used

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  • License plate positioning method in complex background image shot on the basis of handheld terminal
  • License plate positioning method in complex background image shot on the basis of handheld terminal
  • License plate positioning method in complex background image shot on the basis of handheld terminal

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Embodiment Construction

[0030] Below in conjunction with the accompanying drawings, the specific embodiments of the present invention are described in detail:

[0031] like figure 1 As shown, a method for locating a license plate based on a complex background image captured by a handheld terminal provided by this embodiment includes the following steps:

[0032] Step 1: Capture the complex background image containing the license plate based on the handheld terminal to realize image collection;

[0033] Step 2: Establish a detection and segmentation model for vehicle regions in complex background images. The process of segmenting the vehicle area and the complex background is essentially a binary labeling problem. The labeling X={1,0}, where 1 represents the foreground and 0 represents the background, is assigned to each pixel r (r∈Y, Y is The set of all pixels in the image) to maximize the probability P(X|Y). The maximum likelihood probability solution of P(X|Y) is equivalent to the Gibbs energy f...

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Abstract

The invention relates to the field of image processing, and particularly discloses a license plate positioning method in a complex background image shot on the basis of a handheld terminal. The handheld terminal is used for shooting the complex background image which contains a license plate, a detection segmentation model of a vehicle area in the complex background image is established; after the vehicle area positioned in an image foreground is segmented, the hue characteristic information of the vehicle area is extracted and is combined with the priori hue information of the license plate to realize the coarse positioning of the license plate; the geometric aspect ratio characteristic and the regional character-background color pixel ratio of a license plate area subjected to the coarse positioning can be further extracted; and a false license plate is removed to realize the accurate positioning of the license plate. By use of the method, on the basis of the handheld terminal, the complex background image which contains the license plate is collected, license plate positioning can be quickly realized, and the method is high in license plate positioning accuracy.

Description

technical field [0001] The invention mainly relates to the field of digital image processing, in particular to a method for locating a license plate in a complex background image captured by a handheld terminal. Background technique [0002] With the rapid development of economy and society, the development of vehicles has shown an explosive growth. The scientific management of vehicles has become an increasingly important research topic, and the automatic recognition of license plate numbers is an important research aspect. The traditional license plate recognition system is mainly based on a fixed platform and fixed scene, the image acquisition is not flexible enough, the recognition method is relatively simple, and the application scope of the license plate recognition system is greatly limited. [0003] The license plate number recognition system based on the handheld terminal is a flexible license plate recognition system designed based on the portable handheld terminal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32
CPCG06V20/63G06V20/625
Inventor 徐玮赵麒瑞熊志辉张政王炜
Owner NAT UNIV OF DEFENSE TECH
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