A method for intelligent recognition of license plate

An intelligent recognition and license plate technology, applied in character and pattern recognition, instruments, calculations, etc., can solve the problem of inaccurate positioning of tilted license plates, and achieve the effect of improving the ability of intelligent license plate recognition, high recognition accuracy, and reducing license plate tilt.

Active Publication Date: 2021-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of inaccurate positioning of inclined license plates. The algorithm has the advantages of high recognition accuracy and good recognition effect on inclined license plates.

Method used

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  • A method for intelligent recognition of license plate
  • A method for intelligent recognition of license plate
  • A method for intelligent recognition of license plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0064] Such as figure 1 Shown, a kind of license plate intelligent recognition method comprises the following steps:

[0065] S1 acquires the vehicle image containing the license plate, and preprocesses the image, specifically:

[0066] S1.1 converts the obtained vehicle image containing the license plate into a grayscale image; this embodiment can be obtained through a surveillance camera or a smart phone camera, and after the image is obtained, it is converted into an RGB image, and the conversion formula for converting the RGB image into a grayscale image is: :

[0067] Gray=R*0.299+G*0.587+B*0.114 (1)

[0068] S1.2 Filter the grayscale image, specifically using a Gaussian filter. A two-dimensional Gaussian function is expressed as:

[0069]

[0070] Among them, (x, y) is the point coordinates, σ is the standard deviation;

[0071] The Gaussian filter window template is generally an odd number size. For a template with a window size of (2k+1)×(2k+1), the calculation ...

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Abstract

The invention discloses a license plate intelligent recognition method, comprising the following steps: S1 acquires a vehicle image containing a license plate, and preprocesses the image; S2 performs rough positioning of the license plate area on the preprocessed image; S3 performs rough positioning of the license plate area Carry out fine positioning of the license plate on the image; S4 performs character cropping processing on the license plate image obtained by fine positioning; S5 normalizes and extracts features from the cropped character image; S6 uses a template matching algorithm to automatically recognize the license plate characters. The invention solves the problem of inaccurate positioning of inclined license plates, and has the advantages of high recognition accuracy and good recognition effect on inclined license plates.

Description

technical field [0001] The invention relates to the field of intelligent identification of license plates, in particular to an intelligent identification method for license plates. Background technique [0002] With the development of science and technology, the application of digital image processing is becoming more and more extensive. In addition to the enhancement of visual effects, there are more and more application scenarios for image recognition. With the digitization and intelligence of technology, there are more and more image recognition technologies. It is widely used in military and intelligent transportation fields. With the rapid development of intelligent transportation system (Intelligent Transport System, ITS), automatic license plate recognition technology has already become one of the important research topics of image processing and pattern recognition technology in the field of intelligent transportation, and it is an important link to realize the intel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/34G06K9/46G06K9/62
CPCG06V20/584G06V30/153G06V10/44G06V10/751
Inventor 游峰初鑫男李小龙黄玲
Owner SOUTH CHINA UNIV OF TECH
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