【Opencv实战】识别验证码

红太狼 2022-03-26 02:54 397阅读 0赞

# 环境说明 #

opencv-python          3.4.4.19

pytesseract            0.2.6

tesseract              0.1.3

# 安装 #

第一步：安装Tesseract-OCR，下载地址：[tesseract-ocr][]，请记住自己的安装位置，一会儿要用。

第二步：安装tesseract，直接在cmd，命令行输入

pip install tesseract

进行进行自动安装，由于网络问题，这里下载的速度会非常慢，这里给出下载链接。[点这里哦][Link 1]

第三步：安装pytesseract，在命令行模式输入：

pip install pytesseract

这个安装的很快。之后通过

pip list

查看是否安装成功

# 测试 #

import cv2 as cv
    from PIL import Image
    import pytesseract 
     
    def recognize_text():
        gray = cv.cvtColor(src, cv.COLOR_BGR2GRAY)
        ret, binary = cv.threshold(gray, 0, 255, cv.THRESH_BINARY_INV | cv.THRESH_OTSU)
        kernel = cv.getStructuringElement(cv.MORPH_RECT, (1, 6))
        binl = cv.morphologyEx(binary, cv.MORPH_OPEN, kernel)
        kernel = cv.getStructuringElement(cv.MORPH_RECT, (5, 1))
        open_out = cv.morphologyEx(binl, cv.MORPH_OPEN, kernel)
        cv.bitwise_not(open_out, open_out)  # 背景变为白色
        cv.imshow("dstImage", open_out)
        textImage = Image.fromarray(open_out)
        text = pytesseract.image_to_string(textImage)
        print("Result:%s"%text) 
     
    src = cv.imread("yzm.jpg")
    cv.imshow("srcImage", src)
    recognize_text()
    cv.waitKey(0)
    cv.destroyAllWindows()

若出现：TesseractNotFoundError: tesseract is not installed or it's not in your path，报错

请将路径：“C:\\Program Files\\Python36\\Lib\\site-packages\\pytesseract”下的pytesseract.py进行修改：

# CHANGE THIS IF TESSERACT IS NOT IN YOUR PATH, OR IS NAMED DIFFERENTLY
    tesseract_cmd = 'tesseract'

请替换为

# CHANGE THIS IF TESSERACT IS NOT IN YOUR PATH, OR IS NAMED DIFFERENTLY
    tesseract_cmd = r'D:\Program Files (x86)\Tesseract-OCR\tesseract.exe'

因为这里要更换为自己路径。就是第一步安装Tesseract-OCR的路径。

# 测试效果 #

测试图片

![20190115145003499.jpg][]

结果：

![20190115145115349.png][]

![20190115145058445.png][]

![20190115145043278.png][]

--------------------

★finished by songpl，2019.1.15

[tesseract-ocr]: http://digi.bib.uni-mannheim.de/tesseract/tesseract-ocr-setup-4.00.00dev.exe
[Link 1]: https://download.csdn.net/download/plsong_csdn/10918345
[20190115145003499.jpg]: /images/20220326/8a254326165e434dba90a0a90ceb704f.png
[20190115145115349.png]: /images/20220326/7e1396a72ba24e43a5fdfa5b19b539d2.png
[20190115145058445.png]: /images/20220326/711d09e57084432aa9640e046c7d4f7c.png
[20190115145043278.png]: /images/20220326/006355f47e454de1a365d19c16fc1798.png