A license plate location method based on fault tolerance and texture features

A license plate positioning and texture feature technology, applied in the field of image processing, can solve the problems of difficult license plate positioning and loss of detailed features in the license plate area, and achieve the effect of improving license plate positioning rate, low time complexity, and reducing time consumption

Active Publication Date: 2019-12-17
中防通用河北电信技术有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in the complex environment where the license plate itself is polluted and worn, and the contrast is very low, the above positioning algorithms all have the loss of detailed features in the license plate area, which brings a certain degree of difficulty to the license plate location.

Method used

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  • A license plate location method based on fault tolerance and texture features
  • A license plate location method based on fault tolerance and texture features
  • A license plate location method based on fault tolerance and texture features

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Embodiment Construction

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] Such as figure 1 , figure 2 Shown, the present invention comprises the following steps:

[0052] A. Image preprocessing: Gaussian filtering, median filtering and image enhancement processing are performed on the captured image in sequence to obtain the average value of the overall brightness of the image ave0;

[0053] B. Obtaining the edge texture image: By designing a restricted adaptive histogram, the vertical edge texture image is obtained. The specific steps are as follows:

[0054] (i), utilize formula 1 to obtain vertical edge image, wherein, e (i, j) is edge image matrix; g (i, j) is grayscale image matrix;

[0055] e(i,j)=g(i,j+1)-g(i,j) Formula I

[0056] The vertical edge image is obtained by traversing the image. The advantage of obtaining the vertical edge image is that it can exclude the influence of the lice...

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Abstract

The invention discloses a license plate location method based on fault tolerance rate and texture features, which belongs to the technical field of image processing. The overall steps are as follows: firstly, the image is preprocessed, and the edge texture image is obtained by using the restricted adaptive edge histogram combined with the average value of the image brightness. ; Then scan the image according to the texture features of the license plate and the feature extraction algorithm of the license plate to obtain the cluster of license plate line segments; The method locates all possible areas of the license plate; finally, a texture density function is constructed to precisely locate the left and right edges and remove the false license plate. By integrating the fault tolerance rate in the license plate location algorithm, the present invention can effectively improve the location rate of the license plate under various complicated conditions such as pollution, wear, and poor contrast; Some fake license plates reduce the time-consuming and false pick-up rate.

Description

technical field [0001] The invention relates to a positioning method, in particular to a license plate positioning method based on fault tolerance rate and texture features, and belongs to the technical field of image processing. Background technique [0002] As an important means of traffic management automation and an important part of the vehicle detection system, the license plate recognition technology recognizes the vehicle license plate number through a series of algorithm operations such as license plate positioning, character segmentation and character recognition, so that the computerized monitoring and management of vehicles has become a Reality. Among them, the license plate location is a key issue in the automatic license plate recognition technology, and many scholars are currently researching and developing a variety of license plate location methods. [0003] Fundamentally speaking, current license plate location algorithms are mainly divided into three cate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/32G06K9/46
CPCG06V10/25G06V10/44
Inventor 刘黎明魏为
Owner 中防通用河北电信技术有限公司
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