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