A license plate recognition method and device
A technology of license plate recognition and license plate, which is applied in the field of image processing, can solve problems such as incorrect character recognition, and achieve the effect of avoiding incorrect character recognition and solving character recognition problems
Active Publication Date: 2020-04-28
SHENZHEN JIESHUN SCI & TECH IND
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[0005] The purpose of the present invention is to provide a license plate recognition method and device to solve the problem that the existing license plate recognition technology easily leads to incorrect character recognition after character segmentation of curved license plates
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[0052] Compared with the recognition of the traditional straight license plate, the biggest difficulty in recognizing the characters on the curved license plate is how to correctly segment the characters and ensure that each character is complete. Because the license plate is curved, when positioning the upper and lower boundaries of the license plate, only some characters can be aligned, and other characters cannot be aligned. Using a set of templates can easily cause incorrect character cutting. Therefore the present invention has carried out corresponding improvement aiming at the segmentation of the character of curved license plate.
[0053] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, ...
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The invention discloses a license plate recognition method and device. By locating the area containing the license plate in an image to be recognized, a license plate character area is generated; column projection is performed on the license plate character area, and the column projection recognition character block in the license plate character area is determined; The pre-established license plate character template determines the template recognition character block in the license plate character area; according to the template recognition character block and column projection recognition character block, the position of the license plate character template is dynamically adjusted, and the character block after template matching is determined as the segmented Character block: Recognize the characters in the segmented character block to generate a license plate recognition result. This application combines the column projection method and the method of setting templates, and dynamically adjusts the templates for matching, solves the problem of incorrect character segmentation, effectively solves the problem of character recognition of curved license plates, and avoids the use of existing license plate recognition technology. After the character segmentation of the license plate, it is easy to cause the problem of incorrect character recognition.
Description
technical field [0001] The invention relates to the technical field of image processing, in particular to a license plate recognition method and device. Background technique [0002] At present, license plate recognition equipment has been widely used in parking lots, urban roads, expressways and other areas for automatic capture and recognition of vehicle license plates. In the past two years, the fronts of some new car models are protruding and have a certain angle. Especially high-end cars such as Mercedes-Benz and Cadillac. In the image captured by the camera, these license plates are curved. At a position farther from the camera, the license plate is relatively close to a traditional horizontal license plate. Once the vehicle is driven close to the camera, the license plate will appear to be more curved. In the application of the present invention, this type of license plate is called "curved license plate". Traditional license plates are flat without any angles, w...
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IPC IPC(8): G06K9/32G06K9/34
CPCG06V10/243G06V30/153G06V10/25G06V20/625
Inventor 唐健蔡昊然李锐
Owner SHENZHEN JIESHUN SCI & TECH IND