【正文】
................................................................... 6 第 3 章 多路徑識(shí)別算法的基本理論 ....................................................................... 8 多路徑識(shí)別方法的分類 ............................................................................................. 8 精確識(shí)別 ................................................................................................................... 8 概率識(shí)別 ............................................................................................................... 9 多路徑識(shí)別算法的理論基礎(chǔ) ...................................................................................... 9 車牌照識(shí)別的主要算法 ...................................................................................... 9 本文采用的識(shí)別算法 ......................................................................................... 12 第 4 章 基于模板匹配的車牌識(shí)別詳細(xì)設(shè)計(jì) ..................................................... 15 圖像采集 .................................................................................................................... 15 圖像預(yù)處理 ................................................................................................................ 15 車牌定位 .................................................................................................................... 17 傾斜校正 .................................................................................................................... 18 字符分割 .................................................................................................................... 19 字符識(shí)別 .................................................................................................................... 20 字符識(shí)別流程概述 ............................................................................................. 20 本文 字符識(shí)別流程 ............................................................................................. 22 第 5 章 車牌識(shí)別系統(tǒng)在 MATLAB 工具下的實(shí)現(xiàn) ........................................... 28 實(shí)驗(yàn)環(huán)境 .................................................................................................................... 28 平臺(tái)搭建 .................................................................................................................... 28 識(shí)別過程 .................................................................................................................... 29 實(shí)驗(yàn)數(shù)據(jù)及分析 ........................................................................................................ 34 第 6 章 總結(jié)與展望 ...................................................................................................... 36 總結(jié) ........................................................................................................................... 36 展望 ........................................................................................................................... 37 致謝 .................................................................................................................................... 39 參考文獻(xiàn) ........................................................................................................................... 40 附錄 .................................................................................................................................... 41 1 第 1 章 緒論 隨著各省市高速公路的不斷建設(shè),基本上建成了大小規(guī)模不等的聯(lián)網(wǎng)收費(fèi)系統(tǒng),在聯(lián)網(wǎng)收費(fèi)系統(tǒng)建設(shè)中,都面臨了一個(gè)共同的問題 —— 車輛行駛路徑的識(shí)別。 關(guān)鍵詞: 多路徑識(shí)別; 車牌識(shí)別;車牌定位;模板匹配; 字符識(shí)別 3 ABSTRACT As expressway construction unceasingly in provinces, numbers of online charging systems was pleted bascially. In the construction of online charging system, we are facing a mon problem — The identification of vehicle path. Path recognition involves not only how to calculate the tolls to every vehicle, also should consider how to split the ines to relevant charging unit. Toll split is directly related to the legitimate benifit of every expressway,and is the key to working toll. So solving the problem of multipath recognition plays an important role in perfecting the expressway working toll system. This article introduces the multipath recognition algorithms, And emphatically analysed the recognition algorithm of license plate recognition. Based on image characters of license plate, we have a deeply research on the key technologies of the vehicle license plate recognition system, which include three parts: digital image preprocessing, license plate location, license plate characters recognition. In the vehicle images preprocession, the paper use the methods of Histogram Transformation, Edge detection, binarization. For license plate localization using a kind of calculating convolution based on gray image energy extremum region of license plate locating paper use pattern matching which method has been improved to recognize the characters. And using MATLAB to plete the design and implementation of the algorithm. Research results show that the license plate recognition rate is higher, adaptability is stronger, better realtime performance. Key Words: Multipath recognition。對(duì)車牌定位采用了一種基于灰度圖像求取卷積能量極值區(qū)域的車牌定位方法。路徑識(shí)別不僅僅涉及對(duì)每一通行車輛如何計(jì)算通行費(fèi),同時(shí)還要考慮將收入的通行費(fèi)拆分給哪個(gè)收費(fèi)單位的問題,通行費(fèi)的拆分直接 關(guān)系到各條高速公路的合法利益,是聯(lián)網(wǎng)收費(fèi)的關(guān)鍵。所以說解決多路徑識(shí)別問題在完善高速公路聯(lián)網(wǎng)收費(fèi)系統(tǒng)中起著至關(guān)重要的作用。采用模板匹配法對(duì)車牌字符進(jìn)行識(shí)別。License plate identification。 路徑識(shí)別不僅僅涉及對(duì)每一通行車輛如何計(jì)算通行費(fèi),同時(shí)還要考慮將收入的通行費(fèi)拆分給哪 個(gè)收費(fèi)單位的問題,通行費(fèi)的拆分直接關(guān)系到各條高速公路的合法利益, 是聯(lián)網(wǎng)收費(fèi)的關(guān)鍵。 多路徑識(shí)別主要解決高速公路通行費(fèi)的合理收取以及通行費(fèi)的準(zhǔn)確拆分問題。綜上所述,多路徑識(shí)別就 需要解決以下三個(gè)問題: ( 1)高速公路通行費(fèi)的合理收取。它具有以下特點(diǎn): 1.友好的工作平臺(tái)和編程環(huán)境 2 MATLAB 由一系列工具組成。而且新版本的 MATLAB 提供了完整的聯(lián)機(jī)查詢、幫助系統(tǒng),極大的方便了用戶的使用。新版本的MATLAB 語言是基于最為流行的 C++ 語言基礎(chǔ)上的,因此語法特征與 C++ 語言極為相似,而且更加簡(jiǎn)單,更加符合科技人員對(duì)數(shù)學(xué)表達(dá)式的書寫格式。其擁有 600 多個(gè)工程中要用到的數(shù)學(xué)運(yùn)算函數(shù),可以方便的實(shí)現(xiàn)用戶所需的各種計(jì)算功能。 MATLAB 的這些函數(shù)集包括從最簡(jiǎn)單最基本的函數(shù)到諸如矩陣,特征向量、快速傅立葉變換的復(fù)雜函數(shù)。可用于科學(xué)計(jì)算和工程繪圖。 5.應(yīng)用廣泛的模塊集合工具箱 MATLAB 對(duì)許多專門的領(lǐng)域都開發(fā)了功能強(qiáng)大的模塊集和工具箱。允許用戶編寫可以和 MATLAB 進(jìn)行交互的 C 或 C++語言程序。 (包括用戶界面) 在開發(fā)環(huán)境中,使用戶更方便地控制多個(gè)文件和圖形窗口;在編程 方面支持了函數(shù)嵌套,有條件中斷等;在圖形化方面,有了更強(qiáng)大的圖形標(biāo)注和處理功能,包括對(duì)性對(duì)起連接注釋等;在輸入輸出方面,可以直