字符图像的分割与识别(刘万春)

硕士生姓名 学科专业 研究方向 指导教师
罗剑锋 计算机应用 图像处理、图像分析 贾云得
北京理工大学计算机科学工程系 二○○三年一月
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北京理工大学硕士学位ቤተ መጻሕፍቲ ባይዱ文
Abstract
Text information is widely used in society,so segmentation and recognition of character image,one of directions of computer vision research,becomes more and more popular.It can be used in various fieds,such as recognition of handwriting or printing words,recogation of doorplaterecognation of sign of check,digitalizition of engineering paper,visual navigation of robot,and recogniion of all kinds of form,carplate. This paper's main research focuses on segmentation and recogation of character image,including two parts:segmentation of character image and recogation of character image.The former extract character region from complicated image,the later output result of recognation with former's infomation.At first,we do some pretreatment with middler filter ,then we ues Canny filter to strengthen information of edges,after this we use cumulation of difference to locate character region.At last we use eigen function to locate the true character region. segmentation of characters is another key step,we use connectivity region to segment characters,and finally get result of recognition with PCA(Principle Components Analysis). With this method we deal with a lot of images,the result proves that it works well:it can extract most of character region, segment characters exactly.It can recognise English characters and numbers exactly,but we need more research on recognition of Chinese characters for its complicity.
北京理工大学硕士学位论文
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北京理工大学图书馆 ２００２ 年１０ 月２３ 日
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北京理工大学硕士学位论文
工学硕士学位论文
字符图像的分割与识别
关键词：字符识别，字符分割，特征提取，图像处理，图像分割
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北京理工大学硕士学位论文
目
录
Abstract.........................................................................................................................ii 摘 目 要...........................................................................................................................iii 录...........................................................................................................................iv
第一章 绪论..................................................................................................................1 § 1.1 引言.................................................................................................................1 § 1.2 国内外研究概况.............................................................................................2 § 1.2.1................................................................................................................3 § 1.2.2................................................................................................................3 § 1.2.3................................................................................................................3 § 1.2.4................................................................................................................4 § 1.3 本论文概述.....................................................................................................4 § 1.3.1 基本设计思想.......................................................................................4 § 1.3.2 系统的工作原理...................................................................................5 § 1.3.3 本论文的结构.......................................................................................6 第二章 图像的预处理..................................................................................................7 § 2.1 概述.................................................................................................................7 § 2.2 图像的灰度化.................................................................................................7 § 2.3 滤波.................................................................................................................8 § 2.4 其他预处理................................................................................................... 11 2.4.1 直方图均衡化.......................................................................................12 2.4.2 运动模糊的恢复...................................................................................14 § 2.5 本章小结.......................................................................................................15 第三章 字符区域的定位............................................................................................16 § 3.1 概述...............................................................................................................16 § 3.2 去除背景.......................................................................................................16 § 3.3 字符区域粗定位...........................................................................................20 § 3.3.1 边缘增强.............................................................................................20 § 3.3.2 差分累积与二值化.............................................................................24