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License plate detection and recognition system and method in unlimited security scene

A license plate detection and license plate recognition technology, which is applied in the field of computer vision, can solve the problems of difficult license plate detection and recognition, small license plate targets, lens distortion, etc., and achieve the effect of improving license plate detection efficiency, improving accuracy, and increasing license plate recognition speed

Pending Publication Date: 2021-06-15
SHANDONG LANGCHAO YUNTOU INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical task of the present invention is to provide a license plate detection and recognition system and its method in an unlimited security scene in view of the deficiencies of the prior art, aiming to solve the problem of license plate detection and recognition caused by small license plate targets, blurred images, and lens distortion in unlimited security scenes. Problems that are difficult to effectively detect and identify

Method used

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  • License plate detection and recognition system and method in unlimited security scene
  • License plate detection and recognition system and method in unlimited security scene

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Embodiment 1

[0061] As shown in the accompanying drawings, a license plate detection and recognition system in an unlimited security scene of the present invention includes three modules: license plate detection, license plate correction, and license plate recognition;

[0062] The license plate detection module extracts the license plate image according to the obtained unrestricted security scene image, and transmits the license plate image to the license plate correction module in matrix form;

[0063] The license plate correction module transforms the obtained license plate image into a license plate image with a positive perspective;

[0064] The license plate recognition module uses the license plate recognition network to recognize the license plate image obtained from the front view.

[0065] The above license plate detection module, after obtaining the unlimited security scene image, uses the YOLOv5 vehicle detection algorithm to detect the vehicle in the image, outputs the coordin...

Embodiment 2

[0090] A license plate detection and recognition method in an unrestricted security scene of the present invention includes three steps of license plate detection, license plate correction, and license plate recognition;

[0091] Described license plate detection comprises the following steps:

[0092] Step 1.1: Pass the image acquired by the security camera into the pre-trained vehicle detection model, and output the position coordinates of the vehicle after a forward propagation calculation;

[0093] Step 1.2: Obtain the position coordinates according to step 1.1, and crop the original security image to obtain the vehicle image;

[0094] Step 1.3: Pass the vehicle image obtained in step 1.2 into the pre-trained license plate detection model in matrix form, and output the position coordinates of the license plate after a forward propagation calculation;

[0095] Described license plate rectification comprises the following steps:

[0096] Step 2.1: Cut out the license plate...

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Abstract

The invention provides a license plate detection and recognition system and method in an unlimited security scene. The system comprises a license plate detection module, a license plate correction module and a license plate recognition module. The license plate detection module extracts a license plate image according to the obtained unlimited security scene image, and transmits the license plate image to the license plate correction module in a matrix form; the license plate correction module converts the obtained license plate image into a positive-view license plate image; and the license plate recognition module recognizes the obtained positive-view license plate image by using a license plate recognition network. According to the invention, two-stage detection is carried out on the vehicle and the license plate by using a target detection algorithm based on deep learning, the problem that the license plate is too small in size on a security image and is difficult to detect is improved; then the license plate image distorted due to the influence of a shooting visual angle is corrected by using a spatial transformation network; and finally, the license plate is identified by using a full convolutional neural network with wide convolution and CTC loss, and the network identification speed and precision are accelerated without character segmentation.

Description

technical field [0001] The invention relates to a license plate detection and recognition system in an unlimited security scene, in particular to a deep learning-based license plate detection and recognition system and its method, which belong to the technical field of computer vision. Background technique [0002] License plate recognition is an important part of smart transportation and smart security. It plays an important role in speeding violation monitoring, vehicle tracking, electronic police, road condition regulation, etc. It can effectively save police force, reduce the work intensity of law enforcement officers, and promote urban traffic. run efficiently. [0003] The license plate recognition system is to carry out digital image processing and analysis on the photos taken by the camera on the road, and comprehensively apply a large number of latest achievements in image processing and mathematical morphology methods to smooth, binarize, blur, edge detect, and ima...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06N3/04G06N3/08
CPCG06N3/08G06V20/41G06V20/46G06V20/625G06V2201/07G06N3/045
Inventor 刘治财尹元韬李晗
Owner SHANDONG LANGCHAO YUNTOU INFORMATION TECH CO LTD
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