车牌识别图像处理算法的研究与实现(7)

目 录

第1章 绪论············································································································1

1.1 引言································································································································1

1.2 车牌自动识别系统国内外研究现状·············································································3

1.3 本文的主要研究工作····································································································6

第2章 基于有向分形参数的车牌定位·································································8

2.1 基于有向分形参数的车牌定位算法原理·····································································8

2.1.1 分形及分形维数简介··························································································8

2.1.2 基于离散分数布朗增量随机场的分形维数计算方法·······································9

2.1.3 车牌纹理特征研究····························································································11

2.2 基于有向分形参数的车牌定位实验研究···································································13

2.2.1 定位算法描述···································································································13

2.2.2 定位算法具体步骤····························································································16

2.3 定位算法鲁棒性分析··································································································17

2.3.1 模板尺寸与拍摄距离匹配度的分析································································17

2.3.2 模板尺寸和相对像素距离对含噪图像处理能力的分析·································19

2.3.3 有向分形参数的优化设计················································································22

2.4 本章小结······················································································································26

第3章 基于HSV模型和直方图特征值的车牌颜色分类··································27

3.1 车牌颜色分类预处理··································································································27

3.1.1 HSV颜色模型简述····························································································27

3.1.2 基于HSV模型的颜色分类预处理··································································29

3.2 基于直方图特征值的颜色分类实验研究···································································31

3.2.1 车牌颜色直方图的特点····················································································31

3.2.2 直方图特征值概述····························································································32

3.2.3 颜色分类算法实现····························································································33

3.2.4 实验结果与分析·······························································································35

3.3 本章小结······················································································································36

第4章 车牌字符分割···························································································37

4.1 车牌倾斜校正··············································································································37

4.1.1 倾斜角度的计算·······························································································37

4.1.2 基于双线性插值的图像校正············································································38

4.2 车牌字符分割··············································································································39

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