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A Configurable Vehicle License Plate Recognition System

Author: FanZuo
Tutor: HuangFengGang
School: Harbin Engineering University
Course: Applied Computer Technology
Keywords: License plate recognition Edge detection Character segmentation Character recognition BP network
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 91
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Abstract


Vehicle license plate recognition is one of the most important intelligent transportation technologies. Nowadays many researches about license plate recognition perform effectively. But few technologies can process multi-style license plates, which caused repeatedly development. Another important problem in research is the noise of image and the riveted joint of characters.This thesis presents a configurable license plate recognition system with four quantitative parameters: plate skew angle, plate line number, template type and format. The license plate recognition has three parts: license plate location based on edge detection, character segmentation based on template matching and connectivity analysis, character recognition based on ANN.In the license plate location algorithm, the operator of vertical sobel is used in edge detection, because there are many noise edges in edge map, a region growing is carried out to eliminate the discrete edges. In the character segmentation algorithm, the prior knowledge of license plate format is used to create a template, which draw a raw region of characters, and partly improve the robust of the simple connectivity analysis to riveted joints. A typical 3-layer BP network is used in the character recognition algorithm, with the character figure of structure figure based on grey level. And then, according to different license plate styles, the recognition system is consist of symbol, number and character sub-systems, which decreases the amount of classes, and improves the recognition speed.The experiments on test set from real captured car pictures shows that, this vehicle license plate recognition system works on a high accuracy and high speed.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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