License plate character recognizing method of support vector machine

A technology of support vector machine and character recognition, which is applied in character and pattern recognition, computer components, traffic control systems of road vehicles, etc., can solve the problems of poor character recognition effect and low misjudgment rate, so as to improve the recognition rate, Reduce complexity and improve the effect of discrimination

Active Publication Date: 2012-02-08
QINGDAO HISENSE TRANS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of poor recognition effect of the existing license plate characters, the present invention proposes a license plate character recognition method with high recognition rate and low misjudgment rate, which improves the correct rate of character recognition

Method used

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  • License plate character recognizing method of support vector machine
  • License plate character recognizing method of support vector machine
  • License plate character recognizing method of support vector machine

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Experimental program
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Embodiment 1

[0037] Embodiment one, the license plate character recognition method of the support vector machine of the present embodiment, comprises the training process of support vector machine and uses support vector machine to carry out the license plate recognition process, wherein, see figure 1 As shown, the training process of the support vector machine includes the following steps:

[0038] S01, performing license plate preprocessing on the training sample license plate to obtain the character sample set Xtrain;

[0039] As a specific example, the training sample license plate is obtained by collecting enough license plate sample pictures, so that the character types contained in the license plate sample pictures include at least those defined in Appendix B of "Motor Vehicle Number Plates of the People's Republic of China" (GA36-2007) All characters, and due to the different shooting angles and light during the license plate capture process, even the same character has a very diff...

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Abstract

The invention discloses a license plate character recognizing method of a support vector machine. The method comprises a training process of the support vector machine and a process of recognizing a license plate by use of the support vector machine. In the license plate character recognizing method disclosed by the invention, the character features are extracted by an LPP (locality preserving projections) algorithm, and the obtained character features can be better classified for judgment, thereby improving the judgment effect; and a character/number classifier is established by layers, and the characteristics of the license plate can be recognized in a small class range, thus the recognition resolution is improved, the complexity of the recognition algorithm and the training parameter storing resources are reduced, and application in an embedded system is suitable. As video stream statistical identification based on confidence is adopted, the shortcoming of bad recognition effect caused by a bad single-frame shooting effect or bad license plate preprocessing effect is avoided, and the recognition rate can be further improved.

Description

technical field [0001] The invention relates to a license plate character recognition method, in particular to a license plate character recognition method of a support vector machine, which belongs to the technical field of intelligent transportation. Background technique [0002] License plate character recognition is to identify and extract the license plate number from the captured license plate video or image in intelligent transportation. The license plate number in my country is composed of limited Chinese characters, English letters and numbers. License plate recognition usually includes license plate preprocessing: complete the segmentation of license plate characters and the extraction of character samples; then perform feature extraction on license plate characters; finally classify and recognize the extracted features using a classifier to obtain the recognition result of license plate characters. [0003] For license plate character recognition, the most common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/66G08G1/017
Inventor 裴雷陈维强朱中刘微刘韶王晓曼魏楠楠卜柯
Owner QINGDAO HISENSE TRANS TECH
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