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License plate recognition method and device, equipment and storage medium

A technology of license plate recognition and image acquisition equipment, applied in the field of image processing, can solve the problems of poor license plate recognition effect, affect the license plate recognition effect, poor image effect, etc., and achieve the effect of improving the license plate recognition rate

Pending Publication Date: 2021-06-08
ZHEJIANG UNIVIEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the above-mentioned image parameters are dynamically adjusted, the adjustment range of the image parameters is limited. When the image parameters are adjusted to the upper limit when there is a strong forward and backlight scene, the image effect is still poor, resulting in a poor license plate recognition effect. Happening
In addition, if the position of the license plate is specified for regional brightness statistics of a specific area, when there are few passing vehicles, the image parameter compensation value calculated under normal circumstances, and then in the strong forward and backlight scene after a long time interval, there are vehicles again When passed, the image parameter compensation value is no longer applicable, resulting in poor image quality and affecting the license plate recognition effect

Method used

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  • License plate recognition method and device, equipment and storage medium
  • License plate recognition method and device, equipment and storage medium
  • License plate recognition method and device, equipment and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 It is a flow chart of a license plate recognition method in Embodiment 1 of the present application. The embodiment of the present application is applicable to the situation of recognizing the license plate of a driving vehicle in a strong forward and backlight environment. The method is implemented by a license plate recognition device, and the device passes Realized by software and / or hardware, and specifically configured in an electronic device with a certain data computing capability, the electronic device may be an image acquisition device with an image acquisition function.

[0028] like figure 1 A license plate recognition method shown includes:

[0029] S110. When basic image parameters are used for basic frame image acquisition, reference image parameters are used simultaneously for reference frame image acquisition; wherein the reference image parameters include forward-light image parameters or backlight image parameters.

[0030] Among them, the b...

Embodiment 2

[0039] figure 2 It is a flow chart of a license plate recognition method in Embodiment 2 of the present application. The embodiment of the present application is optimized and improved on the basis of the technical solutions of the above-mentioned embodiments.

[0040] Further, the operation "acquisition of reference frame images using reference image parameters" is refined into "according to the vehicle driving direction information, determine the parameter type of the reference image parameters used in the current first granularity time period; wherein, the parameter type It is the forward light type or the backlight type; call the reference image parameters of the parameter type, and perform reference frame image acquisition", so as to improve the determination mechanism of the reference image parameters.

[0041] like figure 2 A license plate recognition method shown includes:

[0042] S210. Determine the parameter type of the reference image parameter used in the curr...

Embodiment 3

[0059] image 3 It is a flow chart of a license plate recognition method in Embodiment 3 of the present application, which is optimized and improved on the basis of the technical solutions of the above-mentioned embodiments.

[0060] Further, the operation "acquisition of a reference frame image using reference image parameters" is refined into "according to the pre-established correspondence between the image acquisition position, time period information, and image parameters, determine that the current acquisition location is at the current second granularity time The parameter value of the reference image parameter corresponding to the segment; according to the determined parameter value of the reference image parameter, the reference frame image acquisition is performed", so as to improve the determination mechanism of the reference image parameter.

[0061] like image 3 A license plate recognition method shown includes:

[0062] S310. Determine the parameter value of t...

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Abstract

The embodiment of the invention discloses a license plate recognition method and device, equipment and a storage medium, and the method comprises the steps: synchronously employing a reference image parameter to carry out reference frame image collection when employing a basic image parameter to carry out basic frame image collection; when the license plate recognition result cannot be obtained according to the basic frame image, obtaining the license plate recognition result determined according to the reference frame image as a target recognition result; wherein the reference image parameter comprises a front light image parameter or a back light image parameter. According to the technical scheme provided by the embodiment of the invention, license plate recognition is carried out in the strong clockwise backlight environment by adopting the reference frame image acquired by the reference image parameter, so that the defect that license plate recognition cannot be carried out on the basic frame image is overcome, and the license plate recognition rate in the strong clockwise backlight environment is improved.

Description

technical field [0001] The embodiments of the present application relate to the technical field of image processing, and in particular to a license plate recognition method, device, equipment, and storage medium. Background technique [0002] License plate recognition is involved in application scenarios such as parks, ordinary roads, and expressways, and the current requirements for the accuracy of license plate recognition are getting higher and higher. However, when the light intensity of the detection environment changes, the recognition result of the license plate will be affected to a certain extent. [0003] In the prior art, a brightness threshold is usually preset, and the regional brightness of a specific region is compared with the preset brightness threshold, and the image parameters are continuously adjusted according to the comparison result until the brightness of the region matches the preset brightness threshold, thereby Ensure the image effect under differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06K9/32
CPCG06V10/141G06V20/63G06V20/625
Inventor 肖乃瑶方淼祝玉宝
Owner ZHEJIANG UNIVIEW TECH CO LTD
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