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Method for fast positioning license plate

A positioning method and license plate technology, applied to instruments, character and pattern recognition, computer components, etc., can solve the problems of low positioning efficiency and decreased positioning accuracy, and achieve fast speed, small amount of calculation, and high positioning accuracy Effect

Active Publication Date: 2015-12-02
ZHEJIANG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] (1) The above method is mainly aimed at vehicle pictures with ordinary pixels, but for vehicle pictures with higher pixels, the positioning efficiency of the above method is often low. If the picture pixels are compressed in advance, the positioning accuracy will be reduced.
[0005] (2) The above license plate positioning method has certain scene and pixel limitations, and the positioning accuracy will often decrease for different scenes

Method used

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  • Method for fast positioning license plate
  • Method for fast positioning license plate
  • Method for fast positioning license plate

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0037] With reference to accompanying drawing, concrete implementation steps are as follows:

[0038] Step 1: Perform an image difference operation on the R, G, and B color channel components of the original color vehicle image I, and the obtained difference image is denoted as Ibr, and the corresponding formula is as follows:

[0039] Ibr=Ib-n×Ir(1)

[0040]Among them, Ib and Ir represent the B channel component and R channel component of the original color vehicle image I respectively, Ibr represents the difference image between the B channel component and the R channel component, n represents the correlation coefficient, which is related to the acquired license plate illumination intensity, and the illumination The weaker, the larger the value of n. In this embodiment, n is set to 1.2, and the effect after channel difference is as foll...

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Abstract

Provided is a method for fast positioning a license plate. The method comprises steps of: performing image subtraction operation on color channel components of an original color vehicle image to obtain a difference image; performing binary operation on a grayscale image Ibr subjected to channel component subtraction by means of an Otsu method; performing dilation operation in the horizontal direction on a binary image Ibw; performing erosion operation on a dilated image Ibw_dilate; searching a communication area of an image Ibw_imerode; computing the height of each area in the Z; removing areas where Ti is less than 11 from the Z in order to obtain a license plate candidate area set Z'; further filtering the license plate candidate areas on the basis of positioned upper and lower boundaries; positioning the left and right boundaries of the license plate candidate areas; and computing the aspect ratio of each license plate candidate area in the Z'' so as to achieve positioning.

Description

technical field [0001] The invention relates to a rapid positioning method of a license plate, in particular to a rapid positioning method for a blue license plate based on RGB color component differences and multi-feature screening. Background technique [0002] There are many existing license plate location technology methods, such as methods based on edge detection, methods based on mathematical morphology, methods based on color information, methods based on wavelet transform, methods based on projection features, etc. Each method has a different focus. Wherein the most similar or closest method with the present invention comprises: Liu Tongyan (South China University of Technology, 2012) in " the related algorithm of license plate recognition system and realization " article proposes a kind of license plate localization algorithm based on improved IsotropicSobel edge detection operator, By improving the IsotropicSobel edge detection operator, the algorithm realizes the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/54
CPCG06V10/245G06V10/20
Inventor 高飞高炎汪韬梅凯城丰敏强卢书芳陆佳炜肖刚
Owner ZHEJIANG UNIV OF TECH
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