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车牌识别系统原理 车牌识别系统应用领域

车牌识别系统原理 车牌识别系统应用领域

作者:志鹏 来源:凯发手机登录苹果版下载 发布时间:2018-08-22 14:34 浏览量:171
导读:凯发手机登录苹果版下载给大家分享车牌识别系统原理和车牌识别系统的应用领域给大家。

  车牌识别系统原理

凯发手机登录苹果版下载   CHEPAISHIBIEGUOCHENGBAOKUOTUXIANGCAIJI、YUCHULI、CHEPAIDINGWEI、ZIFUFENGE、ZIFUSHIBIE、JIEGUOSHUCHUDENGYIXILIESUANFAYUNSUAN,QIYUNXINGLIUCHENGRUXIATUSUOSHI:

车牌识别系统流程图

  1.图像采集

  GENJUCHELIANGJIANCEFANGSHIDEBUTONG,TUXIANGCAIJIYIBANFENWEILIANGZHONG,YIZHONGSHIJINGTAIMOSHIXIADETUXIANGCAIJI,TONGGUOCHELIANGCHUFADIGANXIANQUAN、HONGWAIHUOLEIDADENGZHUANGZHI,JIXIANGJIYIGECHUFAXINHAO,XIANGJIZAIJIESHOUDAOCHUFAXINHAOHOUHUIZHUAPAIYIZHANGTUXIANG,GAIFANGFADEYOUDIANSHICHUFALVGAO,XINGNENGWENDING,QUEDIANSHIXUYAOQIEGEDIMIANPUSHEXIANQUAN,SHIGONGLIANGDA;LINGYIZHONGSHISHIPINMOSHIXIADETUXIANGCAIJI,WAIBUBUXUYAORENHECHUFAXINHAO,XIANGJIHUISHISHIDIJILUSHIPINLIUTUXIANG,GAIFANGFADEYOUDIANSHISHIGONGFANGBIAN,BUXUYAOQIEGEDIMIANPUSHEXIANQUAN,YEBUXUYAOANZHUANGCHEJIANQIDENGLINGBUJIAN,DANQIQUEDIANYESHIFENXIANZHU,YOUYUSUANFADEJIXIAN,GAIFANGANDECHUFALVYUSHIBIELVJIAOZHIWAISHECHUFADOUYAODIYIXIE。

  2.预处理

  YOUYUTUXIANGZHILIANGRONGYISHOUGUANGZHAO、TIANQI、XIANGJIWEIZHIDENGYINSUDEYINGXIANG,SUOYIZAISHIBIECHEPAIZHIQIANXUYAOXIANDUIXIANGJIHETUXIANGZUOYIXIEYUCHULI,YIBAOZHENGDEDAOCHEPAIZUIQINGXIDETUXIANG。YIBANHUIGENJUDUIXIANCHANGHUANJINGHEYIJINGPAISHEDAODETUXIANGDEFENXIDECHUJIELUN,SHIXIANXIANGJIDEZIDONGPUGUANGCHULI、ZIDONGBAIPINGHENGCHULI、ZIDONGNIGUANGCHULI、ZIDONGGUOBAOCHULIDENG,BINGDUITUXIANGJINXINGZAOSHENGGUOLV、DUIBIDUZENGQIANG、TUXIANGSUOFANGDENGCHULI。QUZAOFANGFAYOUJUNZHILVBO、ZHONGZHILVBOHEGAOSILVBODENG;ZENGQIANGDUIBIDUDEFANGFAYOUDUIBIDUXIANXINGLASHEN、ZHIFANGTUJUNHENGHETONGTAILVBOQIDENG;TUXIANGSUOFANGDEZHUYAOFANGFAYOUZUIJINLINCHAZHIFA、SHUANGXIANXINGCHAZHIFAHELIFANGJUANJICHAZHIDENG。

逆光图像
逆光图像
过曝图像
过曝图像
有噪声图像
有噪声图像

  3.车牌定位

  从整个图像中准确地检测出车牌区域,是车牌识别过程的一个重要步骤,如果定位失败或定位不完整,会直接导致最终识别失败。车牌定位方法一般会依据纹理特征、颜色特征和形状特征等信息,采用投影分析、连通域分析、机器学习等算法检测车牌。投影分析方法根据车牌字符与背景交替出现的次数相比于其他情况要多这个特征,通过图像在水平和垂直方向的投影分析来定位车牌。连通域分析根据车牌中的每个字符都是一个连通域且这些连通域的结构和颜色都一致的特征,通过检测并合并这些连通域来定位车牌;机器学习的思路是,先使用从很多个车牌样本中提取出来的特征把一个弱分类器训练成一个强分类器,再使用这个强分类器对图像进行扫描检测从而定位到车牌。由于复杂的图像背景,且要考虑不清晰车牌的定位,所以很容易把栅栏,广告牌等噪声当成车牌,所以如何排除这些伪车牌也是车牌定位的一个难点。为了提高定位的准确率和提高识别速度,一般的车牌识别系统凯发手机登录苹果版下载都会设计一个外部接口,让用户自己根据现场环境设置不同的识别区域。

车牌定位
基于连通域分析的车牌定位方法流程图

  4.车牌校正

  YOUYUSHOUPAISHEJIAODU、JINGTOUDENGYINSUDEYINGXIANG,TUXIANGZHONGDECHEPAICUNZAISHUIPINGQINGXIE、CHUIZHIQINGXIEHUOTIXINGJIBIANDENGBIANXING,ZHEIJIHOUXUDESHIBIECHULIDAILAILEKUNNAN。RUGUOZAIDINGWEIDAOCHEPAIHOUXIANJINXINGCHEPAIXIAOZHENGCHULI,ZHEIYANGZUOYOULIYUQUCHUCHEPAIBIANKUANGDENGZAOSHENG,GENGYOULIYUZIFUSHIBIE。MUQIANCHANGYONGXIAOZHENGFANGFAYOU:HoughBIANHUANFA,TONGGUOJIANCECHEPAISHANGXIA、ZUOYOUBIANKUANGZHIXIANLAIJISUANQINGXIEJIAODU;XUANZHUANTOUYINGFA,TONGGUOANBUTONGJIAODUJIANGTUXIANGZAISHUIPINGZHOUSHANGJINXINGCHUIZHITOUYING,QITOUYINGZHIWEI0DEDIANSHUZHIHEZUIDASHIDEJIAODUJIWEICHUIZHIQINGXIEJIAODU,SHUIPINGJIAODUDEJISUANFANGFAYUQIXIANGSI;ZHUCHENGFENFENXIFA,GENJUCHEPAIBEIJINGYUZIFUJIAOJIECHUDEYANSEJUYOUGUDINGDAPEIZHEIYITEZHENG、QIUCHUYANSEDUITEZHENGDIANDEZHUCHENGFENFANGXIANGJIWEICHEPAIDESHUIPINGQINGXIEJIAODU;FANGCHAZUIXIAOFA,GENJUZIFUZAICHUIZHIFANGXIANGTOUYINGDIANDEZUOBIAOFANGCHAZUIXIAODAOCHUCHUIZHIQINGXIEJIAODEBIHEBIAODASHI,CONGERQUEDINGCHUIZHIQINGXIEJIAODU;TOUSHIBIANHUAN,LIYONGJIANCEDAODECHEPAIDESIGEDINGDIANJINGGUOXIANGGUANJUZHENBIANHUANHOUSHIXIANCHEPAIDEJIBIANXIAOZHENG。

水平和垂直倾斜
水平和垂直倾斜
梯形畸变

  5.字符分割

凯发手机登录苹果版下载   DINGWEICHUCHEPAIQUYUHOU,YOUYUBINGBUZHIDAOCHEPAIZHONGZONGGONGYOUJIGEZIFU、ZIFUJIANDEWEIZHIGUANXI、MEIGEZIFUDEKUANGAODENGXINXI,SUOYI,WEILEBAOZHENGCHEPAILEIXINGPIPEIHEZIFUSHIBIEZHENGQUE,ZIFUFENGESHIBIBUKESHAODEYIBU。ZIFUFENGEDEZHUYAOSILUSHI,JIYUCHEPAIDEERZHIHUAJIEGUOHUOBIANYUANTIQUJIEGUO,LIYONGZIFUDEJIEGOUTEZHENG、ZIFUJIANDEXIANGSIXING、ZIFUJIANJIANGEDENGXINXI,YIFANGMIANBADANGEZIFUFENBIETIQUCHULAI,YEBAOKUOZHANLIANHEDUANLIEZIFUDENGTESHUQINGKUANGDECHULI;LINGYIFANGMIANBAKUAN、GAOXIANGSIDEZIFUGUIWEIYILEICONGERQUCHUCHEPAIBIANKUANGYIJIYIXIEXIAODEZAOSHENG。YIBANCAIYONGDESUANFAYOU:LIANTONGYUFENXI、TOUYINGFENXI,ZIFUJULEIHEMOBANPIPEIDENG。WUSUNCHEPAIHEGUANGZHAOBUJUNZAOCHENGDEMOHUCHEPAIRENGSHIZIFUFENGESUANFASUOMIANDUIDETIAOZHAN,YOUDAIGENGHAODESUANFACHUXIANBINGJIEJUEYISHANGWENTI。

字符切割

  6.字符识别

  DUIFENGEHOUDEZIFUDEHUIDUTUXIANGJINXINGGUIYIHUACHULI,TEZHENGTIQU,RANHOUJINGGUOJIQIXUEXIHUOYUZIFUSHUJUKUMOBANJINXINGPIPEI,ZUIHOUXUANQUPIPEIDUZUIGAODEJIEGUOZUOWEISHIBIEJIEGUO。MUQIANBIJIAOLIUXINGDEZIFUSHIBIESUANFAYOU:MOBANPIPEIFA、RENGONGSHENJINGWANGLUOFA、ZHICHIXIANGLIANGJIFAHEAdaboostFENLEIFADENG。MOBANPIPEIFADEYOUDIANSHISHIBIESUDUKUAI、FANGFAJIANDAN,QUEDIANSHIDUIDUANLIE、WUSUNDENGQINGKUANGDECHULIYOUYIXIEKUNNAN;RENGONGSHENJINGWANGLUOFAXUEXINENGLIQIANG、SHIYINGXINGQIANG、FENLEINENGLIQIANGDANBIJIAOHAOSHI;ZHICHIXIANGLIANGJIFADUIYUWEIJIANGUODECESHIYANGBENJUYOUGENGHAODESHIBIENENGLIQIEXUYAOJIAOSHAODEXUNLIANYANGBEN;AdaboostFENLEIFANENGCEZHONGYUBIJIAOZHONGYAODEXUNLIANSHUJU,SHIBIESUDUKUAI、SHISHIXINGJIAOGAO。WOGUOCHEPAIYOUHANZI、YINGWENZIMUHEALABOSHUZI3ZHONGZIFUZUCHENG,QIEJUYOUTONGYIDEYANGSHI,ZHEIYESHISHIBIEGUOCHENGDEFANGBIANZHICHU。DANYOUYUCHEPAIHENRONGYISHOUWAIZAIHUANJINGDEYINGXIANG,CHUXIANMOHU、DUANLIE、WUSUNZIFUDEQINGKUANG,RUHETIGAOZHEILEIZIFUHEYIHUNXIAOZIFUDESHIBIELV,YESHIZIFUSHIBIEDENANDIANZHIYI。YIHUNXIAOZIFUBAOKUO:0YUD、0YUQ、2YUZ、8YUB、5YUS、6YUG、4YUADENG。

字符识别
污损车牌

  7.车牌结果输出

  JIANGCHEPAISHIBIEJIEGUOYIWENBENGESHISHUCHU,BAOKUOCHEPAIHAO,CHEPAIYANSE,CHEPAILEIXINGDENG。

车牌输出结果

  车牌识别系统应用领域

  一、监测报警

  DUIYUNARU“HEIMINGDAN”DECHELIANG,LIRU:BEITONGJIHUOGUASHIDECHELIANG、QIANJIAOFEICHELIANG、WEINIANJIANCHELIANG、ZHAOSHITAOYIJIWEIZHANGCHELIANGDENG,ZHIXUJIANGQICHEPAIHAOMASHURUDAOYINGYONGXITONGZHONG,CHEPAISHIBIESHEBEIANZHUANGYUZHIDINGDELUKOU、KAKOUHUOYOUZHIFARENYUANSUISHIXIEDAIANXUYAOFANGZHI,XITONGJIANGSHIDUSUOYOUTONGGUOCHELIANGDEPAIZHAOHAOMABINGYUXITONGZHONGDE“HEIMINGDAN”BIDUI,YIDANFAXIANZHIDINGCHELIANGLIKEFACHUBAOJINGXINXI。XITONGKEYIQUANTIANBUJIANDUANGONGZUO、BUHUIPILAO、CUOWULVJIDI;KEYISHIYINGGAOSUXINGSHIDECHELIANG;KEYIZAICHELIANGXINGSHIGUOCHENGZHONGWANCHENGRENWUBUYINGXIANGZHENGCHANGJIAOTONG;ZHENGGEJIANSHIGUOCHENGZHONGSIJIYEBUHUIJUECHA、BAOMIXINGGAO。YINGYONGZHEIZHONGXITONGJIANGJIDADITIGAOZHIFAXIAOLV。

  二、超速违章处罚

  CHEPAISHIBIEJISHUJIEHECESUSHEBEIKEYIYONGYUCHELIANGCHAOSUWEIZHANGCHUFA,YIBANYONGYUGAOSUGONGLU。JUTIYINGYONGSHI:ZAILUSHANGSHEZHICESUJIANCEDIAN,ZHUAPAICHAOSUDECHELIANGBINGSHIBIECHEPAIHAOMA,JIANGWEIZHANGCHELIANGDEPAIZHAOHAOMAJITUPIANFAWANGGECHUKOU;ZAIGECHUKOUSHEZHICHUFADIAN,YONGCHEPAISHIBIESHEBEISHIBIETONGGUOCHELIANGBINGJIANGHAOMAYUYIJINGSHOUDAODECHAOSUCHELIANGDEHAOMABIDUI,YIDANHAOMAXIANGTONGJIQIDONGJINGSHISHEBEITONGZHIZHIFARENYUANCHULI。YUCHUANTONGDECHAOSUJIANCEFANGSHIXIANGBI,ZHEIZHONGYINGYONGKEYIJIESHENGJINGLI,JIANGDIZHIFARENYUANDEGONGZUOQIANGDU,ERQIEANQUAN、GAOXIAO、YINBI,SIJIXUSHIKETIXINGZIJIBUNENGCHAOSU,JIDADIJIANSHAOLEYINCHAOSUYINFADESHIGU。

  三、车辆出入管理

  JIANGCHEPAISHIBIESHEBEIANZHUANGYUCHURUKOU,JILUCHELIANGDEPAIZHAOHAOMA、CHURUSHIJIAN,BINGYUZIDONGMEN、LANGANJIDEKONGZHISHEBEIJIEHE,SHIXIANCHELIANGDEZIDONGGUANLI。YINGYONGYUTINGCHECHANGKEYISHIXIANZIDONGJISHISHOUFEI,YEKEYIZIDONGJISUANKEYONGCHEWEISHULIANGBINGJICHUTISHI,SHIXIANTINGCHESHOUFEIZIDONGGUANLIJIESHENGRENLI、TIGAOXIAOLV。YINGYONGYUZHINENGXIAOQUKEYIZIDONGPANBIESHIRUCHELIANGSHIFOUSHUYUBENXIAOQU,DUIFEINEIBUCHELIANGSHIXIANZIDONGJISHISHOUFEI。ZAIYIXIEDANWEIZHEIZHONGYINGYONGHAIKEYITONGCHELIANGDIAODUXITONGXIANGJIEHE,ZIDONGDI、KEGUANDIJILUBENDANWEICHELIANGDECHUCHEQINGKUANG,H3ZHIZAITONGXINGGUANLIXITONGCAIYONGLECHEPAISHIBIEJISHU,DADAOBUTINGCHE、MIANQUKA,YOUXIAOTIGAOCHELIANGCHURUTONGXINGXIAOLV。

车牌识别系统应用领域

  四、自动放行

  将指定的牌照信息输入系统,系统自动地识读经过车辆的牌照并查询内部数据库。对于需要自动放行的车辆系统驱动电子门或道闸让其通过,对于其它车辆系统会给出警示,由值勤人员处理。可用于特殊单位(如军事管理区、保密单位、重点保护单位等)、路桥收费卡口、高级住宅区等。

  五、高速公路收费管理

  ZAIGAOSULUDEGEGECHURUKOUANZHUANGCHEPAISHIBIESHEBEI,CHELIANGSHIRUSHISHIBIECHELIANGPAIZHAOJIANGRUKOUZILIAOCUNRUSHOUFEIXITONG,CHELIANGDAODACHUKOUSHIZAICISHIBIEQIPAIZHAOBINGGENJUPAIZHAOXINXIDIAOYONGRUKOUZILIAO,JIEHECHURUKOUZILIAOSHIXIANSHOUFEIGUANLI。ZHEIZHONGYINGYONGKEYISHIXIANZIDONGJIFEIBINGKEFANGZHIZUOBI,BIMIANLEYINGSHOUKUANDELIUSHI。

  GAOSUGONGLUYIKAISHISHISHILIANWANGSHOUFEI,SUIZHELIANWANGFANWEIDEKUODA,BUTONGCHEXINGDESHOUFEICHAEYEYUELAIYUEGAO,SIJILIYONGXIANYOUSHOUFEIXITONGDELOUDONGTONGGUOZHONGTUHUANKAJINXINGTAOFEIDEWENTIJIANGYUELAIYUETUCHU,LIYONGCHEPAISHIBIEJISHUSHIJIEJUECILEIWENTIDEGENBENFANGFA。

  六、计算车辆旅行时间

凯发手机登录苹果版下载   ZAIJIAOTONGGUANLIXITONGZHONGKEYIJIANGCHELIANGZAIMOUTIAODAOLUDEPINGJUNLVXINGSHIJIANZUOWEIPANDUANGAIDAOLUYONGDUZHUANGKUANGDEYIGECANSHU。ANZHUANGCHEPAISHIBIESHEBEIYUDAOLUDEQIZHIDIAN,SHIDUSUOYOUTONGGUOCHELIANGBINGJIANGPAIZHAOHAOMACHUANHUIJIAOTONGZHIHUIZHONGXIN,ZHIHUIZHONGXINDEGUANLIXITONGGENJUZHEIXIEJIEGUOJIUKEJISUANCHUCHELIANGPINGJUNLVXINGSHIJIAN。

  七、牌照号码自动登记

  JIAOTONGJIANGUANBUMENMEITIANDOUYAOCHULIDALIANGDEWEIZHANGCHELIANGTUPIAN,YIBANYOURENGONGBIANSHICHEPAIHAOMAZAISHURUGUANLIXITONG,ZHEIZHONGFANGSHIGONGZUOLIANGDA、RONGYIPILAOWUPAN。CAIYONGZIDONGSHIBIEKEYIJIANSHAOGONGZUOQIANGDUNENGGOUDAFUDUTIGAOCHULISUDUHEXIAOLV。ZHEIZHONGGONGNENGKEYONGYUDIANZIJINGCHAXITONG、DAOLUJIANKONGXITONGDENG。

  车牌识别停车场系统凯发手机登录苹果版下载将摄像机在入口拍摄的车辆车牌号码图象自动识别并转换成数字信号。做到一卡一车,车牌识别的优势在于可以把卡和车对应起来,使管理提高一个档次,卡和车的对应的优点在于长租卡须和车配合使用,杜绝一卡多车使用的漏洞,提高物业管理的效益;同时自动比对进出车辆,防止偷盗事件的发生。升级后的摄像系统可以采集更清晰的图片,作为档案保存,可以为一些纠纷提供有力的证据。方便了管理人员在车辆出场时进行比对,大大增强了系统的安全性。

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