License plate detection method and device under complex scene

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: 2016-12-28
ZHEJIANG UNIVIEW TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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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.

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  • License plate detection method and device under complex scene
  • License plate detection method and device under complex scene
  • License plate detection method and device under complex scene

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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 under a complex scene. The method includes the steps that input images are coarsely positioned, coarse positioning includes horizontal filtering and binarization processing, and a trained fine positioning classifier is used for carrying out license plate region detection on the images with coarse positioning regions. The method further includes the steps that a false detection decrease classifier obtained after branch training is used for removing the images with license plate regions in false detection out of the images with the license plate regions detected, and the final images containing the vehicle plate regions are obtained. The invention further provides a license plate detection device. Compared with existing methods, the license plate detection method and device have the prominent advantages that the false detection rate is low, and the speed is higher than that of the existing methods on the basis of guaranteeing the correct detection rate of license plates.

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...

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Application Information

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Patent Type & Authority Applications(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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