Multi-camera-based vehicle license plate recognition method
A multi-camera, license plate recognition technology, applied in the field of computer vision, can solve the problems of large angular freedom, inability to recognize, poor approach angle, etc.
Active Publication Date: 2015-04-29
厦门翼歌软件科技有限公司
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Problems solved by technology
However, in some places where public vehicles enter and exit, the entrances and exits are often wide, so that the angle of vehicle entry and exit is relatively large. Due to the wide-angle limitation of the single camera, many vehicles cannot be recognized due to poor entry angles.
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[0060] Cooperate figure 1 with figure 2 Shown, the present invention discloses a kind of license plate recognition method based on multi-camera, comprises the following steps:
[0061] S1. Establish a multi-camera acquisition terminal
[0062] Based on the situation of vehicle entrance and exit and the parameters of a single camera, calculate the number of cameras required for the best detection field of view and install them. This step is specifically implemented through the following steps:
[0063] S11. Obtain the vehicle entrance and exit environmental parameters and camera parameters, the vehicle entrance and exit environmental parameters include the traffic width W and the maximum wide angle θ, the camera parameters include the erection height H, the external parameter matrix M 1 and internal parameter matrix M 2 .
[0064] S12. According to the camera parameters, calculate the maximum coverage area S of a single camera by the following formula s :
[0065] ...
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The invention discloses a multi-camera-based vehicle license plate recognition method. The multi-camera-based vehicle license plate recognition method comprises the following steps: building a multi-camera acquisition terminal, calculating the number of cameras under a best detection view based on the condition of vehicle entrance and exit and parameters of single camera, and installing; acquiring vehicle video by the multi-camera acquisition terminal and transmitting the vehicle video to a vehicle license plate recognition module; recognizing each frame of vehicle image acquired by each camera by the vehicle license plate recognition module to obtain a vehicle license plate result; voting in a mixing manner based on all the vehicle license plate results to obtain a best vehicle license plate result. The multi-camera-based vehicle license plate recognition method is characterized by shooting and recognizing the same vehicle at multiple angles when the vehicle enters and exits to obtain the vehicle license plate results under different angles and positions, further voting and screening a plurality of groups of results to obtain a sole best vehicle license plate result; the reorganization rate of the vehicle license plates is greatly increased.
Description
technical field [0001] The invention relates to the technical field of computer vision, in particular to a multi-camera-based license plate recognition method. Background technique [0002] License plate recognition is a successful application of image processing and pattern recognition technology in modern intelligent transportation. Through the image or video collected by the camera, the image processing and analysis technology is used to locate the license plate image from the image, and then the license plate image is divided into individual license plate character images, and the final license plate result is obtained by applying pattern recognition technology. [0003] Most of the traditional license plate recognition technologies are solutions based on photographing. At the entrance and exit of the vehicle, the ground sense signal is used to determine the entry and exit of the vehicle, and then the camera is controlled to capture the vehicle, and then the license plat...
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IPC IPC(8): G06K9/00G06K9/60
CPCG06V20/62
Inventor 郑海舟杨延生
Owner 厦门翼歌软件科技有限公司