License plate character segmenting method

Abstract

The invention discloses a license plate character segmenting method which comprises the following steps of: S10. correcting an inclined license plate; S11. removing an upper frame and a lower frame of the license plate; S12. segmenting license plate characters; and S13. normalizing the character size. The license plate character segmenting method overcomes the shortcomings that the traditional license plate character segmenting method is greatly affected by the background of the license plate, is high in the partitioning error rate, huge in calculation amount and long in execution time; the license plate character segmenting method is based on vertical projections and center-to-center spacing of the characters; and according to the license plate character segmenting method, firstly, a vertical projection method is used for realizing the coarse segmentation of the license plate characters, and then a first or second character segmentation region is found according to the center-to-center spacing of the license plate characters, the widths of the license plate characters and the prior knowledge of the license plate, and finally the merging of Chinese characters and the fine segmentation of numbers and English characters are realized. The license plate character segmenting method has the advantages that the computation complexity is low, the capacity of resisting disturbance is strong, the characters can be segmented from the background and the reliability is very high.

Description

technical field [0001] The invention belongs to the technical field of license plate recognition in intelligent transportation, and in particular relates to a method for segmenting license plate characters. Background technique [0002] With the rapid development of road construction in various countries and the continuous increase of the number of vehicles, the task of traffic management is becoming increasingly heavy. Using computer vehicle license plate recognition technology to automatically detect and recognize vehicle license plate numbers plays a very important role in modern traffic monitoring. License plate detection and recognition technology is one of the important research topics of digital image processing and pattern recognition technology in the field of intelligent transportation system (ITS), which plays an important role in promoting the development of intelligent transportation system and the development of transportation industry , more broad market prosp...

AI Technical Summary

Problems solved by technology

However, the program logic design of this method is complex, there are many loop nests, and the real-time processing time is too long

At the same time, in order to improve the accuracy of the preset centroid, there is a certain limit on the width of the license plate

[0007] It can be seen that there are many defects in the prior art license plate character segmentation methods: the traditional projection method and the connected domain method are greatly affected by the license plate background, and when the license plate characters are polluted, the segmentation error rate is very high, which directly affects the subsequent license plate character recognition; Although the clustering analysis method can overcome some slightly complicated backgrounds, it has a large amount of calculation and requires relatively high computer speed; it takes a long time to execute and is time-consuming, and for license plate images with wide margins, it is easy to divide the margins into character, causing misjudgment

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