車牌識(shí)別技術(shù)研究

電氣工程論文編號(hào):DQ013  論文字?jǐn)?shù):22557,頁(yè)數(shù):44 附任務(wù)書，開題報(bào)告，文獻(xiàn)綜述，外文翻譯,軟件系統(tǒng)

目錄
摘 要 II
Abstract III
1 緒論 1
1.1 研究背景 1
1.1.1 車牌識(shí)別系統(tǒng)國(guó)外狀況 1
1.1.2 車牌識(shí)別系統(tǒng)國(guó)內(nèi)狀況 2
1.2 研究任務(wù)與目標(biāo) 2
2 海康智能識(shí)別板卡 4
2.1 產(chǎn)品介紹 4
2.1.1 產(chǎn)品簡(jiǎn)介 4
2.1.2 產(chǎn)品功能 4
2.1.3 產(chǎn)品性能 5
2.2 產(chǎn)品應(yīng)用與開發(fā)支持 5
2.2.1 產(chǎn)品應(yīng)用 5
2.2.2 開發(fā)支持 6
3 開發(fā)軟件Visual C++ 6
3.1 VC++簡(jiǎn)介 7
3.1.1 C++的發(fā)展 7
3.1.2 可視化編程及其發(fā)展 8
3.1.3 面向?qū)ο蟪绦蛟O(shè)計(jì) 9
3.2 Visual C++ 6.0的開發(fā)環(huán)境簡(jiǎn)介 11
3.2.1 Visual C++ 6.0的用戶界面簡(jiǎn)介 11
3.2.2 MFC簡(jiǎn)介 11
4 車牌識(shí)別系統(tǒng)原理 14
4.1 車牌圖像預(yù)處理 14
4.1.1 圖像灰度化 14
4.1.2 中值濾波 15
4.1.3 灰度變換 15
4.1.4 直方圖均衡化 15
4.1.5 圖像二值化 16
4.2 車牌定位 16
4.2.1 定位常用方法比較 16
4.2.2 水平搜索定位 17
4.2.3 汽車牌照的左右定位 18
4.3 車牌字符切割 19
4.3.1 字符切割研究現(xiàn)狀 19
4.3.2 車牌圖像二值化 19
4.3.3 字符切割算法 20
4.3.4 車牌圖像的歸一化 20
4.4 車牌字符識(shí)別 21
4.4.1 牌照字符識(shí)別的常用方法介紹與比較 21
4.4.2 BP神經(jīng)網(wǎng)絡(luò)識(shí)別 22
5 系統(tǒng)實(shí)現(xiàn) 27
5.1系統(tǒng)施工 27
5.1.1 車牌識(shí)別系統(tǒng)外圍產(chǎn)品選型 27
5.1.2 車牌識(shí)別工程現(xiàn)場(chǎng)調(diào)試 27
5.2 系統(tǒng)軟件設(shè)計(jì) 29
6 總結(jié) 38
致 謝 39
參考文獻(xiàn) 40

摘 要
 隨著世界各國(guó)工業(yè)迅猛發(fā)展，汽車數(shù)量與日劇增，城市交通狀況日益受到人們的重視，如何有效地進(jìn)行交通管理，越來(lái)越成為各國(guó)政府和有關(guān)部門所關(guān)注的焦點(diǎn)。科學(xué)、高效的利用好現(xiàn)有交通基礎(chǔ)資源成為進(jìn)一步挖掘我國(guó)城市交通能力的有效途徑。針對(duì)此問(wèn)題，開發(fā)智能交通系統(tǒng)是較合適的解決方法。智能交通系統(tǒng)也是2l世紀(jì)世界道路交通的發(fā)展趨勢(shì)。
 車牌識(shí)別技術(shù)是一項(xiàng)應(yīng)用范圍非常廣的技術(shù)，在人們的生活中發(fā)揮著越來(lái)越重要的作用， 在公共安全、交通管理、及相關(guān)軍事部門有著重要的應(yīng)用價(jià)值。汽車牌照識(shí)別技術(shù)是一個(gè)以特定目標(biāo)為對(duì)象的專用計(jì)算機(jī)視覺(jué)系統(tǒng)，能從一幅圖像中自動(dòng)提取車牌圖像，自動(dòng)分割字符，進(jìn)而對(duì)字符進(jìn)行識(shí)別。該技術(shù)對(duì)采集到的汽車圖像進(jìn)行處理，能夠?qū)崟r(shí)準(zhǔn)確地自動(dòng)識(shí)別出車牌的數(shù)字、字母及漢字字符，并以計(jì)算機(jī)可直接運(yùn)行的數(shù)據(jù)形式給出識(shí)別結(jié)果。 
 此次研究使用海康威視DS-4000HC/P車牌識(shí)別智能板卡，此卡壓縮比極高，圖像質(zhì)量好，實(shí)時(shí)完成視頻圖像的壓縮，不丟幀，能較好的完成車牌識(shí)別功能，節(jié)省了開發(fā)時(shí)間，同時(shí)也提高了系統(tǒng)性能，保證車牌識(shí)別準(zhǔn)確度。
 本文結(jié)合理論和實(shí)踐，對(duì)復(fù)雜背景下的車牌識(shí)別系統(tǒng)的各關(guān)鍵技術(shù)進(jìn)行了深入研究，并應(yīng)用了新的思想和方法，對(duì)車牌字符識(shí)別技術(shù)的研究具有很大的意義和應(yīng)用價(jià)值。
 
關(guān)鍵詞：車牌識(shí)別； 車牌定位；字符切分；車牌字符識(shí)別

Abstract
With the rapid development of industrial countries in the world， increase the number of cars with the day， the city traffic conditions have become an increasing attention， effectively traffic management， has become a focal point of concern by more and more governments and relevant departments. How to make good use of existing transportation infrastructure and resources scientifically for the Chinese cities has become an effective means of transport for that matter， the development of intelligent transportation system (ITs) is a more appropriate solution. Intelligent Transportation Systems is the world's road traffic 2l century trends.
License plate recognition technology is a very wide range of applications of the technology. It is playing an increasingly important role in public safety in people's lives. Traffic management， and related military departments have an important application value. Vehicle license plate recognition technology is a specific target groups dedicated computer vision system， can automatically extract an image plate images， automatic segmentation of characters， and thus to identify characters. The technology of the vehicle collected image processing， in real time automatically and accurately identify the license plate numbers， letters and Chinese characters， and to direct the operation of the computer data to identify the results are given.
This study uses Hikvision DS-400HC/P card， this card has very high compression ratio， image quality， real-time video images to complete the compression， and won't dropped frames， It can finish the recognition of the completion of registration better， save the development time， but also improve the system performance to ensure the accuracy of license plate recognition.
In this paper， with the theory and practice of the context， have the depth research of the complexity of the license plate recognition system of the key technologies， and put forward new ideas and methods， license plate character recognition technology has great significance and application value.

Keywords：License Plate Recognition; plate positioning; character segmentation; license plate character recognition