【正文】 the better quality license plate is needed for properly divide the license plate. So this paper thoroughly studied the pretreatment before the division, especially the wipe of the noise after the binarization including open arithmetic, close arithmetic, wipe of the edge, and wipe of the round spot etc. Secondly, there are two methods to divide the plate. The first is the method of invariable boundary and the other is the method of vertical shadow. At the same time, make the division in the two methods separately. The tests indicate that both of the two methods can make the division, but both of them can not do it well. Finally, bine the two methods and reach the improving method of vertical shadow after analyze merit and demerit of the two methods, The tests indicate that this method make a better division especially to the plate which still have some noise after wiping the noise. Keywords: the division of license plate character； binarization； pretreatment； the method of shadow 目錄 目錄 摘要 ..........................................................................................................................................I ABSTRACT .......................................................................................................................... II 目 錄 ....................................................................................................................................... III 第一章 緒論 ......................................................................................................................... 1 車牌識別技術(shù)的應(yīng)用背景及前景 ........................................................................................ 1 車牌識別系統(tǒng)的工作原理及組成 ........................................................................................ 3 字符分割的發(fā)展現(xiàn)狀 ......................................................................................................... 3 本文研究主要內(nèi)容 ............................................................................................................. 4 本文的結(jié)構(gòu) ....................................................................................................................... 4 第二章 車牌字符分割的相關(guān)理論基礎(chǔ) ............................................................................. 6 數(shù)字圖像處理技術(shù) ............................................................................................................. 6 二值圖像 ........................................................................................................................ 6 灰度圖像 .................................................................................................................... 6 數(shù)學形態(tài)學理論基礎(chǔ) ......................................................................................................... 7 數(shù)學形態(tài)學的基本概念 ............................................................................................... 7 二 值形態(tài)學的基本運算 ............................................................................................... 7 第三章 車牌圖像的預(yù)處理 ................................................................................................. 9 車牌圖像的灰度化 ............................................................................................................. 9 車牌圖像的二值化 ............................................................................................................. 9 車牌圖像的去噪處理 ....................................................................................................... 10 車牌圖像的開運算 .....................................................................................................11 車牌圖像的閉運算 .................................................................................................... 12 去除車牌邊框 ........................................................................................................... 12 去除車牌圖像中的圓點 ............................................................................................. 13 第四章 車牌字符分割方法 ............................................................................................... 14 基于垂直投影的車牌字符分割方法 .................................................................................. 14 基于固定邊界法的車牌字符分割方法 ............................................................................... 15 固定邊界法的原理 .................................................................................................... 15 目錄 應(yīng)用固定邊界法的實現(xiàn)步驟 ...................................................................................... 16 投影法與邊界法相結(jié)合 .................................................................................................... 16 第五章 車牌字符分割系統(tǒng)圖形用戶界面設(shè)計 ............................................................... 18 介紹 .......................................................................................................................... 18 本文設(shè)計圖形用戶界面 .................................................................................................... 18 第六章 總結(jié)和展望 ........................................................................................................... 23 總結(jié) ................................................................................................................................ 23 展望 ................................................................................................................................ 24 參考文獻 ............................................................................................................................... 25 致謝 .......................................................................................................... 錯誤 !未定義書簽。針對這些問題，人們開始將計算機技術(shù)、通信技術(shù)、計算機網(wǎng)絡(luò)技術(shù)和自動化信息處理等很多新的科學技術(shù)用于交通道路的監(jiān)視和管理系統(tǒng)，以此提高車輛管理和運輸?shù)男省?本文是在以往的車牌分割算法的基礎(chǔ)上介紹了車牌識別技術(shù)中的一種字符分割算法， 該算法是 針對一種已有的字符分割 算法 （投影法） 的改進性研究。伴隨著世界各國汽車數(shù)量的增加，城市的交通狀況越來越受到人們的重視。 ITS 是 20 世紀 90 年代興起的新一代交通運輸系統(tǒng)。 車牌識別 (License Plate Recognition, LPR)技術(shù)作為 智能交通系統(tǒng)（ ITS） 的重要 組成部分 ，在交通 管理 和控制中 占 有 著 很重要的地位，可以應(yīng)用到以下一些領(lǐng)域： （ 1） 封閉式