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License plate detection method and device in complex scenes

A license plate detection and complex scene technology, applied in the field of image processing, can solve the problems of high false detection rate, license plate feature design, and time-consuming detection, and achieve the effect of low false detection rate

Active Publication Date: 2019-11-05
ZHEJIANG UNIVIEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that there is no rough positioning, and it takes a lot of time to scan the entire vehicle body area for license plate detection, and there is no feature design for the license plate. Therefore, for license plates with rich body textures, there is also a high false detection rate.

Method used

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  • License plate detection method and device in complex scenes
  • License plate detection method and device in complex scenes
  • License plate detection method and device in complex scenes

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Embodiment Construction

[0078] In order to further explain the present invention, the present invention will now be explained in conjunction with the accompanying drawings and embodiments.

[0079] The method of the current embodiment of the present invention is as figure 1 Shown, utilize the license plate detecting device of the present invention to carry out. The current embodiment of the present invention includes the following steps:

[0080] Step 1: Coarse license plate location based on the license plate segmentation filter. This step is carried out using the coarse positioning unit, and the process of coarse positioning is as follows figure 2 As shown in , set the size of the filter according to the calibrated width and height of the license plate, filter the input image, binarize and extract the connected area, and obtain the candidate frame where the license plate is located. This step can greatly reduce the image size of the subsequent processing , to improve processing efficiency.

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Abstract

The invention discloses a license plate detection method in a complex scene, which includes: performing rough positioning on an input image, the rough positioning includes horizontal filtering and binarization processing, and using a trained fine positioning classifier to classify areas with rough positioning The license plate area detection is performed on the image of the license plate area, which also includes: the image of the license plate area is detected through the false detection classifier obtained by branch training to exclude the image of the falsely detected license plate area, and obtain the final image containing the license plate area. The invention also includes a license plate detection device. Compared with the existing methods, the license plate detection method and device adopted by the present invention have the outstanding advantages of low false detection rate and faster speed than the existing methods on the basis of ensuring the correct detection rate of the license plate.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a license plate detection method and device in complex scenes. Background technique [0002] License plate detection technology is the core basic module in intelligent transportation systems, providing key information for many applications, such as vehicle capture, license plate location and recognition, vehicle violation capture, etc. [0003] In the actual traffic scene, the license plate is rich and diverse: there are blue cards and yellow cards; under different lighting conditions, there will be overexposure and low contrast; some vehicles will be blocked and dirty; license plates will be tilted at different shooting angles and other complex situations; and Some road and car body advertisements have rich textures, which are easy to try and misdetect. How to improve the license plate detection index and performance in various complex scenarios is a challenging problem. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46G06K9/38G06K9/62
CPCG06V10/28G06V10/443G06V20/625G06F18/24
Inventor 危春波
Owner ZHEJIANG UNIVIEW TECH CO LTD
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