License plate recognition method and device
A technology for number plates and recognition results, applied in the field of image recognition, which can solve the problems of character segmentation failure, low system stability and anti-interference, and inability to be widely used in complex environments.
Active Publication Date: 2015-05-20
深圳中科龙智汽车科技有限公司
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Problems solved by technology
These methods are greatly affected by noise, which can lead to the failure of character segmentation and thus the failure of character recognition
[0004] In addition, in the prior art, the character segmentation in number plate recognition usually processes the characters individually instead of the number plate as a whole, and does not fully consider the relationship between characters, which makes the single character segmentation vulnerable to input image noise The influence of the system, the system stability and anti-interference are low, and it cannot be widely used in complex environments
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[0080] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0081] Embodiments of the present invention provide a method and device for number plate recognition. In this solution, the number plate area in the image is first obtained; The recognition area of each character in the card area; the recognition area of each character is identified with a preset character recognizer, and the recognition result is obtained; the recognition result includes: each character identified and the matching degree corresponding to each c...
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An embodiment of the invention discloses a license plate recognition method and device. The method includes: acquiring a license plate area in an image; according to preset recognition area parameter of parameters and relational parameter of the characters, determining the recognition area of each character; using a preset character recognizer to recognize the recognition areas of the characters to acquire recognition results; calculating a sum of matching degrees of the characters; in a preset range, according to preset traversing conditions, adjusting the preset recognition area parameter of the characters and the relational parameter of the characters, and returning to the step of determining the recognition areas of the characters until that values in the preset range are traversed according to a traversing algorithm; from the calculated sum of the matching degrees of the characters, acquiring a highest recognition result of the sum of the matching degrees of the characters, as an optimal recognition result; outputting the optimal recognition result. The license plate recognition method and device has the advantages that the problem that noise interference occurs in the image processing step during character recognition is avoided, system stability is improved and interference resistance is improved.
Description
technical field [0001] The invention relates to the technical field of image recognition, in particular to a method and device for number plate recognition. Background technique [0002] Number plate recognition technology has a wide range of applications in practical applications, which can be summarized as follows: number plate recognition is the technical basis for many important applications, such as in the field of intelligent transportation, automatic parking management, high-speed automatic toll collection, vehicle violation monitoring, etc. etc.; number plate recognition is the basis for locating and managing vehicles, such as in the field of mass video retrieval, license plate recognition, house number recognition, text road sign recognition, etc.; number plate recognition provides important clues for accurate retrieval. [0003] In the prior art, the number plate recognition method usually includes the following three steps: number plate location, character segment...
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IPC IPC(8): G06K9/62G06K9/20
Inventor 张伟伟
Owner 深圳中科龙智汽车科技有限公司