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Feature selection method suitable for license plate recognition

A feature selection method and license plate recognition technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve the problems of many interference items in the license plate number image, and it is difficult to select good recognition features, so as to improve the anti-interference ability and improve the The effect of stability

Inactive Publication Date: 2019-11-26
刘小英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that there are many interference items in the current license plate number image, and it is difficult to select a good recognition feature. The purpose is to provide a feature selection method suitable for license plate recognition and solve the above problems

Method used

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Embodiment

[0019] The present invention is applicable to the feature selection method of license plate recognition, comprises the license plate number sample image, also comprises the following steps:

[0020] S1, after performing image denoising processing, performing image information statistics on the sample image of the license plate number to obtain a basic statistical feature set;

[0021] S2, obtaining a feature point set based on the image's own attributes;

[0022] S3, acquiring a set of feature points defined by the region;

[0023] S4. Calculate the variance of each feature set sub-item based on the feature set obtained in S1-S3, and select the 6 features with the smallest variance, and then use the feature compression method to reduce the dimension of the 6 features to form 3 description features as an image The feature of is used as the feature parameter of the license plate number image.

[0024] The set of feature points defined by the region includes LOG operator, Forst...

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Abstract

The invention discloses a feature selection method suitable for license plate recognition, and relates to license plate recognition feature selection. The feature selection method comprises a vehiclelicense plate number sample image, and further comprises the following steps: S1, performing image information statistics on the vehicle license plate number sample image after image denoising processing to obtain a basic statistical feature set; S2, obtaining a feature point set based on the attributes of the image; S3, acquiring a feature point set defined by the region; and S4, calculating thevariance of each feature set sub-item according to the feature sets obtained in the steps S1-S3, selecting six features with minimum variances, and performing dimension reduction on the six features by adopting a feature compression method to form three description features as features of the image to serve as feature parameters of the license plate number image. According to the invention, by selecting proper features, the stability, accuracy and real-time performance of license plate number image feature selection can be effectively improved; and feature effectiveness under different conditions can be comprehensively considered, and the anti-interference capability of image features is improved.

Description

technical field [0001] The invention relates to feature selection for license plate recognition, in particular to a feature selection method suitable for license plate recognition. Background technique [0002] The license plate recognition technology requires the ability to extract and recognize the moving license plate from the complex background, and recognize the vehicle license plate number, color and other information through license plate extraction, image preprocessing, feature extraction, license plate character recognition and other technologies. The latest technical level The recognition rate of letters and numbers can reach 99.7%, and the recognition rate of Chinese characters can reach 99%. At present, there are many interference items in the license plate number image, and it is difficult to select good recognition features. Contents of the invention [0003] The technical problem to be solved by the present invention is that there are many interference item...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62
CPCG06V20/625G06F18/2113
Inventor 刘小英
Owner 刘小英