A license plate positioning method based on R channel horizontal neighboring region variance calculating
A license plate positioning and leveling technology, which is applied in computing, computer components, instruments, etc., can solve the problems of easy false detection, sticking of license plate characters, sensitivity of license plate defacement, etc., to avoid influence, reduce interference edge, and improve accuracy rate effect
Active Publication Date: 2018-01-12
ZHEJIANG UNIV OF TECH
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[0004] To sum up, the current license plate location method based on license plate edge texture information has the following deficiencies: (1) It is sensitive to the sticking of license plate characters and the license plate is stained; (2) When the background is complex, it is prone to false detection
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[0028] The specific implementation of the license plate location method based on R-channel horizontal neighborhood variance calculation of the present invention will be described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0029] A kind of license plate positioning method based on R channel horizontal neighborhood variance calculation of the present invention comprises the following steps:
[0030] Step 1: Extract the R channel from the color image containing the license plate, denoted as image r such as figure 1 shown;
[0031] Step 2: Calculate the gray value variance S(x, y) of each pixel point p(x, y) in the horizontal neighborhood of the image r, and the horizontal neighborhood range of each pixel point p(x, y) is selected as follows :
[0032] 2.1): If x
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The invention discloses a license plate positioning method based on R channel horizontal neighboring region variance calculating. According to the license plate positioning method based on R channel horizontal neighboring region variance calculating, vehicle license plate positioning is carried out by calculating the variance of a horizontal neighboring region gray value in an R channel image. According to the invention, license plate positioning is performed in a limiting way, so that the effect on the license plate positioning by the license plate character adhesion and license plate foulingcan be effectively avoided; interference edges in the license plate positioning can be reduced; the license plate area can be highlighted; and the license plate positioning accuracy can be raised.
Description
technical field [0001] The invention belongs to the technical field of computer vision and intelligent transportation, and in particular relates to a license plate positioning method based on R channel horizontal neighborhood variance calculation for license plate positioning by calculating the horizontal neighborhood gray value variance in the R channel image. Background technique [0002] With the continuous development of the field of intelligent transportation, it is currently necessary to recognize license plates in road traffic safety monitoring systems, automatic toll collection systems, and community vehicle management systems, and the accuracy of license plate recognition is also increasingly demanding. The premise of license plate recognition is to locate the license plate area, so license plate location is a very critical step in license plate recognition. [0003] At present, many scholars have proposed different license plate location methods, which can be mainl...
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IPC IPC(8): G06K9/20G06K9/32
Inventor 高飞汪敏倩蔡益超金一鸣卢书芳张元鸣肖刚
Owner ZHEJIANG UNIV OF TECH