License plate status recognition method and device
A state recognition and license plate technology, applied in the field of image processing, can solve the problems of identifying wrong vehicles and low accuracy of license plate state recognition
Inactive Publication Date: 2018-05-01
HANGZHOU HIKVISION DIGITAL TECH
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Problems solved by technology
[0005] However, the above-mentioned license plate state recognition method relies on the operator of the monitoring center to watch the surveillance video to identify the license plate state of each vehicle.
However, in actual work, after watching the surveillance video for a long time, the operator may recognize the license plate status of the wrong vehicle due to eye fatigue and other reasons, resulting in low recognition accuracy of the license plate status
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[0106] As an implementation manner of the embodiment of the present invention, the identification module 520 includes:
[0107] A first determining submodule (not shown in the figure), configured to determine the vehicle profile of the vehicle to be detected according to the first image;
[0108] The second determination submodule (not shown in the figure) is used to determine the feature points of the vehicle to be detected according to the vehicle profile of the vehicle to be detected;
[0109] The identification sub-module (not shown in the figure) is used to identify the feature points at the preset positions among the feature points of the vehicle to be detected, and determine the feature area according to the identified feature points.
[0110] As an implementation of the embodiment of the present invention, the state of the license plate includes: intentional cover, defacement, unhanging license plate, normal front and rear vehicle cover, or normal license plate, and th...
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The embodiment of the invention provides a license plate status recognition method and device. The method comprises steps: a first image comprising a to-be-detected vehicle is acquired; a feature areaof the first image is recognized, wherein the feature area is an area comprising the license plate of the to-be-detected vehicle; a second image comprising the feature area is determined; and the second image is inputted to a pre-trained convolutional neural network to obtain the license plate status of the to-be-detected vehicle, wherein the convolutional neural network is obtained through training each second sample image comprising the feature area of the first sample image and the license plate status corresponding to the second sample image. The embodiment of the invention can improve the license plate status detection accuracy.
Description
technical field [0001] The invention relates to the technical field of image processing, in particular to a license plate state recognition method and device. Background technique [0002] The license plate is a two-panel board hung on the front and rear of the vehicle, usually made of aluminum, plastic or stickers. The license plate number, registration area or other basic information of the vehicle will be displayed on the board. The license plate number is the "identity card" of the vehicle and is an important information to distinguish other vehicles. [0003] The license plate in abnormal state is the license plate that the traffic police department focuses on, such as intentionally covering, or not hanging the license plate, etc. In order to effectively supervise each vehicle and improve the safety of vehicle driving; or to prevent crimes from happening, when the traffic police department recognizes a vehicle with an abnormal license plate, it usually punishes the veh...
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IPC IPC(8): G06K9/00G06K9/32G08G1/017
CPCG08G1/017G06V20/584G06V20/62G06V20/625
Inventor 韦立庆罗兵华
Owner HANGZHOU HIKVISION DIGITAL TECH