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README.md
Apache-2.0

EasyPR

EasyPR是一个开源的中文车牌识别系统,其目标是成为一个简单、高效、准确的非限制场景(unconstrained situation)下的车牌识别库。

相比于其他的车牌识别系统,EasyPR有如下特点:

  • 它基于openCV这个开源库。这意味着你可以获取全部源代码,并且移植到opencv支持的所有平台。
  • 它能够识别中文。例如车牌为苏EUK722的图片,它可以准确地输出std:string类型的"苏EUK722"的结果。
  • 它的识别率较高。图片清晰情况下,车牌检测与字符识别可以达到80%以上的精度。

更新

本次更新版本是1.6正式版本,主要有以下几点更新:

  1. 修正了多项readme的文本提示。

  2. 增加了C#调用EasyPR的一个项目的链接,感谢 @zhang-can 同学。

注意

  1. 对于Opencv3.2或以上版本,如果碰到编译问题,例如“ANN_MLP”相关的错误,尝试将config.h中将#define CV_VERSION_THREE_ZERO改为#define CV_VERSION_THREE_TWO试试.

  2. linux系统推荐使用Opencv3.2以上版本。3.2以下的版本例如3.0和3.1在识别时可能会出现车牌识别结果为空的情况。稳妥起见,建议都升级到最新的3.2版本。Windows版本没有这个问题。

待做的工作

  • 完成一个CNN框架
  • 替换ANN为CNN
  • 增加新能源车的识别(待定)
  • 增加两行车牌的识别(待定)

跨平台

目前除了windows平台以外,还有以下其他平台的EasyPR版本。一些平台的版本可能会暂时落后于主平台。

现在有一个无需配置opencv的1.5版本的懒人版。仅仅支持vs2013,也只能在debug和x86下运行,其他情况的话还是得配置opencv。感谢范文捷同学的帮助。页面里的两个文件都要下载,下载后用7zip解压。

版本 开发者 版本 地址
C# zhang-can 1.5 zhang-can/EasyPR-DLL-CSharp
android goldriver 1.4 linuxxx/EasyPR_Android
linux Micooz 1.6 已跟EasyPR整合
ios zhoushiwei 1.3 zhoushiwei/EasyPR-iOS
mac zhoushiwei,Micooz 1.6 已跟EasyPR整合
java fan-wenjie 1.2 fan-wenjie/EasyPR-Java
懒人版 fan-wenjie 1.5 git/oschina

兼容性

当前EasyPR是基于opencv3.0版本开发的,3.0及以上的版本应该可以兼容,以前的版本可能会存在不兼容的现象。

例子

假设我们有如下的原始图片,需要识别出中间的车牌字符与颜色:

EasyPR 原始图片

经过EasyPR的第一步处理车牌检测(PlateDetect)以后,我们获得了原始图片中仅包含车牌的图块:

EasyPR 车牌

接着,我们对图块进行OCR过程,在EasyPR中,叫做字符识别(CharsRecognize)。我们得到了一个包含车牌颜色与字符的字符串:

“蓝牌:苏EUK722”

示例

EasyPR的调用非常简单,下面是一段示例代码:

	CPlateRecognize pr;
	pr.setResultShow(false);
	pr.setDetectType(PR_DETECT_CMSER);
     
	vector<CPlate> plateVec;
	Mat src = imread(filepath);
	int result = pr.plateRecognize(src, plateVec);

我们首先创建一个CPlateRecognize的对象pr,接着设置pr的属性。

	pr.setResultShow(false);

这句话设置EasyPR是否打开结果展示窗口,如下图。设置为true就是打开,否则就是关闭。在需要观看定位结果时,建议打开,快速运行时关闭。

EasyPR 输出窗口

	pr.setDetectType(PR_DETECT_CMSER);

这句话设置EasyPR采用的车牌定位算法。CMER代表文字定位方法,SOBEL和COLOR分别代表边缘和颜色定位方法。可以通过"|"符号结合。

	pr.setDetectType(PR_DETECT_COLOR | PR_DETECT_SOBEL);

除此之外,还可以有一些其他的属性值设置:

	pr.setLifemode(true);

这句话设置开启生活模式,这个属性在定位方法为SOBEL时可以发挥作用,能增大搜索范围,提高鲁棒性。

	pr.setMaxPlates(4);

这句话设置EasyPR最多查找多少个车牌。当一副图中有大于n个车牌时,EasyPR最终只会输出可能性最高的n个。

下面来看pr的方法。plateRecognize()这个方法有两个参数,第一个代表输入图像,第二个代表输出的车牌CPlate集合。

	vector<CPlate> plateVec;
	Mat src = imread(filepath);
	int result = pr.plateRecognize(src, plateVec);

当返回结果result为0时,代表识别成功,否则失败。

CPlate类包含了车牌的各种信息,其中重要的如下:

	CPlate plate = plateVec.at(i);
	Mat plateMat = plate.getPlateMat();
	RotatedRect rrect = plate.getPlatePos();
	string license = plate.getPlateStr();

plateMat代表车牌图像,rrect代表车牌的可旋转矩形位置,license代表车牌字符串,例如“蓝牌:苏EUK722”。

这里说下如何去阅读如下图的识别结果。

EasyPR DetectResults

第1行代表的是图片的文件名。

第2行代表GroundTruth车牌,用后缀(g)表示。第3行代表EasyPR检测车牌,用后缀(d)表示。两者形成一个配对,第4行代表两者的字符差距。

下面同上。本图片中有3个车牌,所有共有三个配对。最后的Recall等指标代表的是整幅图片的定位评价,考虑了三个配对的结果。

有时检测车牌的部分会用“无车牌”与“No string”替代。“无车牌”代表“定位不成功”,“No string”代表“定位成功但字符分割失败”。

版权

EasyPR的源代码与训练数据遵循Apache v2.0协议开源。

EasyPR的resources/image/general_test文件夹下的图片数据遵循GDSL协议(通用数据共享协议)进行开放。

请确保在使用前了解以上协议的内容。

目录结构

以下表格是本工程中所有目录的解释:

目录 解释
src 所有源文件
include 所有头文件
test 测试程序
model 机器学习的模型
resources/text 中文字符映射表
resources/train 训练数据与说明
resources/image 测试用的图片
resources/doc 相关文档
tmp 训练数据读取目录,需要自建

以下表格是resources/image目录中子目录的解释:

目录 解释
general_test GDTS(通用数据测试集)
native_test NDTS(本地数据测试集)
tmp Debug模式下EasyPR输出中间图片的目录,需要自建

以下表格是src目录中子目录的解释:

目录 解释
core 核心功能
preprocess SVM预处理
train 训练目录,存放模型训练的代码
util 辅助功能

以下表格是src目录下一些核心文件的解释与关系:

文件 解释
plate_locate 车牌定位
plate_judge 车牌判断
plate_detect 车牌检测,是车牌定位与车牌判断功能的组合
chars_segment 字符分割
chars_identify 字符鉴别
chars_recognise 字符识别,是字符分割与字符鉴别功能的组合
plate_recognize 车牌识别,是车牌检测与字符识别的共有子类
feature 特征提取回调函数
plate 车牌抽象
core_func.h 共有的一些函数

以下表格是test目录下文件的解释:

文件 解释
main.cpp 主命令行窗口
accuracy.hpp 批量测试
chars.hpp 字符识别相关
plate.hpp 车牌识别相关

以下表格是train目录下文件的解释:

文件 解释
ann_train.cpp 训练二值化字符
annCh_train.hpp 训练中文灰度字符
svm_train.hpp 训练车牌判断
create_data.hpp 生成合成数据

使用

请参考这里

获取帮助

详细的开发与教程请见介绍与开发教程

如果你在使用过程中遇到任何问题,请在这里告诉我们。

EasyPR讨论QQ群号是:一群:366392603,二群:583022188,三群:637614031,加前请注明EasyPR学习讨论。

Contributors

  • liuruoze:1.0-1.2,1.5版作者

  • 海豚嘎嘎(车主之家):1.3版算法贡献者,提升了车牌定位与字符识别的准确率

  • Micooz:1.3-1.4版架构重构,linux与mac支持,opencv3.0支持,utf-8编码转换

  • jsxyhelu:deface版本一

  • zhoushiwei:deface版本二

  • ahccom:新的plateLocate函数

  • 阿水:1.3版整合,数据标注等工作

  • fan-wenjie:1.5版opencv整合版提供者

  • Free:1.6版数据提供者

鸣谢

taotao1233,邱锦山,唐大侠,jsxyhelu,如果有一天(zhoushiwei),学习奋斗,袁承志,圣城小石匠,goldriver,Micooz,梦里时光,Rain Wang,任薛纪,ahccom,星夜落尘,海豚嘎嘎(车主之家),刘超,Free大神,以及所有对EasyPR贡献数据的热心同学。

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简介

EasyPR是一个中文的开源车牌识别系统,其目标是成为一个简单、高效、准确的车牌识别引擎。相比于其他的车牌识别系统,EasyPR有如下特点:* 它基于openCV这个开源库。这意味着你可以获取全部源代码,并且移植到java等平台。* 它能够识别中文。例如车牌为苏EUK722的图片,它可以准确地输出std:string类型的"苏EUK722"的结果。* 它的识别率较高。图片清晰情况下,车牌检测与字符识别可以达到80%以上的精度。 展开 收起
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