python下调用pytesseract识别某网站验证码
来源:互联网 发布:神通数据库的英文 编辑:程序博客网 时间:2024/05/30 22:41
一、pytesseract介绍
1、pytesseract说明
pytesseract最新版本0.1.6,网址:https://pypi.python.org/pypi/pytesseract
Python-tesseract is a wrapper for google's Tesseract-OCR
( http://code.google.com/p/tesseract-ocr/ ). It is also useful as a
stand-alone invocation script to tesseract, as it can read all image types
supported by the Python Imaging Library, including jpeg, png, gif, bmp, tiff,
and others, whereas tesseract-ocr by default only supports tiff and bmp.
Additionally, if used as a script, Python-tesseract will print the recognized
text in stead of writing it to a file. Support for confidence estimates and
bounding box data is planned for future releases.
翻译一下大意:
a、Python-tesseract是一个基于google's Tesseract-OCR的独立封装包;
b、Python-tesseract功能是识别图片文件中文字,并作为返回参数返回识别结果;
c、Python-tesseract默认支持tiff、bmp格式图片,只有在安装PIL之后,才能支持jpeg、gif、png等其他图片格式;
2、pytesseract安装
INSTALLATION:
Prerequisites:
* Python-tesseract requires python 2.5 or later or python 3.
* You will need the Python Imaging Library (PIL). Under Debian/Ubuntu, this is
the package "python-imaging" or "python3-imaging" for python3.
* Install google tesseract-ocr from http://code.google.com/p/tesseract-ocr/ .
You must be able to invoke the tesseract command as "tesseract". If this
isn't the case, for example because tesseract isn't in your PATH, you will
have to change the "tesseract_cmd" variable at the top of 'tesseract.py'.
Under Debian/Ubuntu you can use the package "tesseract-ocr".
Installing via pip:
See the [pytesseract package page](https://pypi.python.org/pypi/pytesseract)
```
$> sudo pip install pytesseract
翻译一下:
a、Python-tesseract支持python2.5及更高版本;
b、Python-tesseract需要安装PIL(Python Imaging Library) ,来支持更多的图片格式;
c、Python-tesseract需要安装tesseract-ocr安装包,具体参看上一篇博文。
综上,Pytesseract原理:
1、上一篇博文中提到,执行命令行 tesseract.exe 1.png output -l eng ,可以识别1.png中文字,并把识别结果输出到output.txt中;
2、Pytesseract对上述过程进行了二次封装,自动调用tesseract.exe,并读取output.txt文件的内容,作为函数的返回值进行返回。
二、pytesseract使用
USAGE:
```
> try:
> import Image
> except ImportError:
> from PIL import Image
> import pytesseract
> print(pytesseract.image_to_string(Image.open('test.png')))
> print(pytesseract.image_to_string(Image.open('test-european.jpg'), lang='fra'))
可以看到:
1、核心代码就是image_to_string函数,该函数还支持-l eng 参数,支持-psm 参数。
用法:
image_to_string(Image.open('test.png'),lang="eng" config="-psm 7")
2、pytesseract里调用了image,所以才需要PIL,其实tesseract.exe本身是支持jpeg、png等图片格式的。
实例代码,识别某公共网站的验证码(大家千万别干坏事啊,思虑再三,最后还是隐掉网站域名,大家去找别的网站试试吧……):
#-*-coding=utf-8-*-__author__='zhongtang'import urllibimport urllib2import cookielibimport mathimport randomimport timeimport osimport htmltoolfrom pytesseract import *from PIL import Imagefrom PIL import ImageEnhanceimport reclass orclnypcg: def __init__(self): self.baseUrl='http://jbywcg.****.com.cn' self.ht=htmltool.htmltool() self.curPath=self.ht.getPyFileDir() self.authCode='' def initUrllib2(self): try: cookie = cookielib.CookieJar() cookieHandLer = urllib2.HTTPCookieProcessor(cookie) httpHandLer=urllib2.HTTPHandler(debuglevel=0) httpsHandLer=urllib2.HTTPSHandler(debuglevel=0) except: raise else: opener = urllib2.build_opener(cookieHandLer,httpHandLer,httpsHandLer) opener.addheaders = [('User-Agent','Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11')] urllib2.install_opener(opener) def urllib2Navigate(self,url,data={}): #定义连接函数,有超时重连功能 tryTimes = 0 while True: if (tryTimes>20): print u"多次尝试仍无法链接网络,程序终止" break try: if (data=={}): req = urllib2.Request(url) else: req = urllib2.Request(url,urllib.urlencode(data)) response =urllib2.urlopen(req) bodydata = response.read() headerdata = response.info() if headerdata.get('Content-Encoding')=='gzip': rdata = StringIO.StringIO(bodydata) gz = gzip.GzipFile(fileobj=rdata) bodydata = gz.read() gz.close() tryTimes = tryTimes +1 except urllib2.HTTPError, e: print 'HTTPError[%s]\n' %e.code except urllib2.URLError, e: print 'URLError[%s]\n' %e.reason except socket.error: print u"连接失败,尝试重新连接" else: break return bodydata,headerdata def randomCodeOcr(self,filename): image = Image.open(filename) #使用ImageEnhance可以增强图片的识别率 #enhancer = ImageEnhance.Contrast(image) #enhancer = enhancer.enhance(4) image = image.convert('L') ltext = '' ltext= image_to_string(image) #去掉非法字符,只保留字母数字 ltext=re.sub("\W", "", ltext) print u'[%s]识别到验证码:[%s]!!!' %(filename,ltext) image.save(filename) #print ltext return ltext def getRandomCode(self): #开始获取验证码 #http://jbywcg.****.com.cn/CommonPage/Code.aspx?0.9409255818463862 i = 0 while ( i<=100): i += 1 #拼接验证码Url randomUrlNew='%s/CommonPage/Code.aspx?%s' %(self.baseUrl,random.random()) #拼接验证码本地文件名 filename= '%s.png' %(i) filename= os.path.join(self.curPath,filename) jpgdata,jpgheader = self.urllib2Navigate(randomUrlNew) if len(jpgdata)<= 0 : print u'获取验证码出错!\n' return False f = open(filename, 'wb') f.write(jpgdata) #print u"保存图片:",fileName f.close() self.authCode = self.randomCodeOcr(filename)#主程序开始orcln=orclnypcg()orcln.initUrllib2()orcln.getRandomCode()
三、pytesseract代码优化
上述程序在windows平台运行时,会发现有黑色的控制台窗口一闪而过的画面,不太友好。
略微修改了pytesseract.py(C:\Python27\Lib\site-packages\pytesseract目录下),把上述过程进行了隐藏。
# modified by zhongtang hide console window
# new code
IS_WIN32 = 'win32' in str(sys.platform).lower()
if IS_WIN32:
startupinfo = subprocess.STARTUPINFO()
startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
startupinfo.wShowWindow = subprocess.SW_HIDE
proc = subprocess.Popen(command,
stderr=subprocess.PIPE,startupinfo=startupinfo)
'''
# old code
proc = subprocess.Popen(command,
stderr=subprocess.PIPE)
'''
# modified end
- python下调用pytesseract识别某网站验证码
- Python--pytesseract验证码识别处理实例
- Python模块pytesseract验证码识别
- python使用pytesseract识别验证码的方法
- 利用python pytesseract进行OCR(验证码识别)
- python 使用tesseract-ocr , pytesseract , PIL进行验证码识别
- Python使用pytesseract库识别验证码(Mac)
- pytesseract的简单验证码的识别-python
- python+pillow+pytesseract+Tesseract-OCR验证码识别
- 基于pytesseract的验证码识别
- 基于pytesseract的验证码识别
- 关于Python验证码识别安装PIL、tesseract-ocr与pytesseract模块的错误解决
- Python验证码识别 安装Pillow、tesseract-ocr与pytesseract模块的安装以及错误解决
- Python 3.6 版本 Pytesseract 图像验证码识别 PyCharm 报错FileNotFoundError
- python---POST/GET请求数据包,图片验证码自动化识别,pytesseract,模拟用户一次正常登录
- windows下pytesseract识别验证码遇到的WindowsError: [Error 2] 的解决方法
- Python——验证码识别 安装Pillow、tesseract-ocr与pytesseract模块的安装以及错误解决
- python-简单验证码识别-保监会网站
- Codeforces Round #433 (Div. 2)
- 猴子挖花生问题
- linux安装VMware,并克隆多台虚拟机
- Flutter简介
- 《MYSQL入门很简单》
- python下调用pytesseract识别某网站验证码
- linux 查看是否安装了MySQL
- 采用ISegment进行点转线(或点转面)时容易出现的错误
- 穷举n位二进制
- ccf 201612-4 压缩编码 石子合并问题(DP+平行四边形优化)
- Mysql数据类型---字符串类型
- Codeforces Round #433 (Div. 2 C. Planning(优先队列)
- python类与对象part1
- Python pickle模块学习(超级详细)