License plate character recognizing method of support vector machine

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 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. For license plate character recognition, the most commonly used methods ...

AI Technical Summary

Problems solved by technology

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

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