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License plate correction method, device and system and readable storage medium

A correction method and license plate technology, applied in instruments, character and pattern recognition, computer parts and other directions, can solve the problems of reduced recognition accuracy, high image quality requirements, inability to perceive license plate recognition errors, etc., to achieve the effect of improving the accuracy rate

Pending Publication Date: 2022-02-25
深圳云游四海信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these solutions have the above-mentioned defects that the results cannot be correctly recognized when the license plate characters are partially blocked, the recognition accuracy rate decreases due to a severely tilted license plate, the image quality requirements are relatively high, and the license plate recognition error cannot be perceived.

Method used

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  • License plate correction method, device and system and readable storage medium
  • License plate correction method, device and system and readable storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a method for correcting a license plate. The method includes steps S1-S10. Before performing step S1, it is necessary to use completed normal parking orders to pre-establish or update the parking behavior model and vehicle picture feature model. , License plate number model.

[0052] The three models are described below:

[0053] A) Parking behavior model:

[0054] The parking behavior model includes license plate numbers and the time of entry and exit events and berths corresponding to each license plate number. The establishment or updating of the parking behavior model includes:

[0055] a1: Obtain normal parking orders that have been completed in the recent period, and extract orders with license plate numbers whose order times are greater than the preset times;

[0056] For example, extract normal parking orders that have been completed in the last month, and extract parking orders with license plate numbers with more than 20 orders.

...

Embodiment 2

[0109] This embodiment discloses a license plate correction device, which includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, the steps of the method described in Embodiment 1 are implemented. The specific implementation process can be Refer to the description of the foregoing method embodiments, and details are not repeated here.

Embodiment 3

[0111] This embodiment discloses a readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method described in Embodiment 1 are implemented. For the specific implementation process, please refer to the description of the above method embodiment. I won't repeat them here.

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PUM

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Abstract

The invention discloses a license plate correction method, device and system and a readable storage medium. The method comprises the steps: obtaining correction data of camera terminal equipment, and extracting vehicle image features, parking behaviors and a license plate number to be calibrated from the correction data; inputting a license plate number to be calibrated into a pre-established license plate number model to obtain a fuzzy matched license plate number; and traversing the license plate numbers on the fuzzy matching to perform first comprehensive similarity calculation, and if the highest value of the first comprehensive similarity is greater than a preset similarity value, selecting the license plate number corresponding to the highest value for output. According to the invention, license plate correction is carried out based on the image and parking behavior modeling, a license plate can be correctly recognized when characters are slightly shielded and the license plate is seriously inclined, the method can be used for assisting an existing license plate recognition technology, the accuracy of the license plate recognition technology is remarkably improved, the method can be used for abnormality discovery and early discovery when license plate recognition errors occur, and manual intervention is performed in advance.

Description

technical field [0001] The invention relates to the field of intelligent parking, in particular to a license plate correction method, device, system and readable storage medium. Background technique [0002] Smart parking is an important part of intelligent city construction. On-street parking that makes full use of urban roads is an important part of realizing smart parking. High-level video is an important solution to solve on-street parking charges and monitoring. The accuracy of license plate recognition is a very urgent and critical issue. In the actual environment, high-level video faces many challenges, specifically: the license plate will be blocked by various factors, such as pedestrians, bicycles, electric vehicles, and other electric vehicles; Various angles of inclination increase the difficulty of character recognition, for example, 0 and D, 6 and G are highly similar because of the inclination; extreme weather causes the license plate to be blurred, such as sn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06V20/62G06V10/74G06K9/62
CPCG06F18/22
Inventor 黄二雨
Owner 深圳云游四海信息科技有限公司