文字识别

案例1

• 下载tesseract-ocr
  

• 双击安装
  

• 同意
  

• 为所有人安装
  

• 下一步
  

• 指定安装目录
  

• 开始安装
  

• 完成
  

• 配置环境变量
  

• 配置如下

C:\Program Files (x86)\Tesseract-OCR

• 验证

# 打开cmd测试
C:\Users\ychen>tesseract -v
tesseract 4.00.00alpha
 leptonica-1.74.1
  libgif 4.1.6(?) : libjpeg 8d (libjpeg-turbo 1.5.0) : libpng 1.6.20 : libtiff 4.0.6 : zlib 1.2.8 : libwebp 0.4.3 : libopenjp2 2.1.0

• 测试

# 文件夹中放1张图片，cmd进入改目录，执行如下命令，识别文字后在当前目录保存为result.txt
tesseract XXX.png result

案例2

• 安装依赖

C:\Users\ychen\Downloads>pip install pytesseract
Collecting pytesseract
  Using cached https://mirrors.aliyun.com/pypi/packages/8b/0d/6efe2a9bddf1b1efe82a86fdd057f4affaeebd14347f32d03bbbbc45821c/pytesseract-0.3.9-py2.py3-none-any.whl
pytesseract requires Python '>=3.7' but the running Python is 3.6.3
You are using pip version 9.0.1, however version 24.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

C:\Users\ychen\Downloads>python -m pip install --upgrade pip
Cache entry deserialization failed, entry ignored
Collecting pip
  Downloading https://mirrors.aliyun.com/pypi/packages/a4/6d/6463d49a933f547439d6b5b98b46af8742cc03ae83543e4d7688c2420f8b/pip-21.3.1-py3-none-any.whl (1.7MB)
    100% |████████████████████████████████| 1.7MB 690kB/s
Installing collected packages: pip
  Found existing installation: pip 9.0.1
    Uninstalling pip-9.0.1:
      Successfully uninstalled pip-9.0.1
Successfully installed pip-21.3.1
You are using pip version 21.3.1, however version 24.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

C:\Users\ychen\Downloads>pip install pytesseract
Looking in indexes: https://mirrors.aliyun.com/pypi/simple/
Collecting pytesseract
  Using cached https://mirrors.aliyun.com/pypi/packages/8b/0d/6efe2a9bddf1b1efe82a86fdd057f4affaeebd14347f32d03bbbbc45821c/pytesseract-0.3.9-py2.py3-none-any.whl (14 kB)
Collecting packaging>=21.3
  Downloading https://mirrors.aliyun.com/pypi/packages/05/8e/8de486cbd03baba4deef4142bd643a3e7bbe954a784dc1bb17142572d127/packaging-21.3-py3-none-any.whl (40 kB)
     |████████████████████████████████| 40 kB 523 kB/s
Collecting Pillow>=8.0.0
  Downloading https://mirrors.aliyun.com/pypi/packages/8f/10/c8dc9fff37b69b5962b7783ab4835611e83dada453cd9913d82ca2a1321b/Pillow-8.4.0-cp36-cp36m-win_amd64.whl (3.2 MB)
     |████████████████████████████████| 3.2 MB 731 kB/s
Collecting pytesseract
  Downloading https://mirrors.aliyun.com/pypi/packages/a3/c9/d6e8903482bd6fb994c32722831d15842dd8b614f94ad9ca735807252671/pytesseract-0.3.8.tar.gz (14 kB)
  Preparing metadata (setup.py) ... done
Requirement already satisfied: Pillow in c:\programdata\anaconda3\lib\site-packages (from pytesseract) (4.2.1)
Requirement already satisfied: olefile in c:\programdata\anaconda3\lib\site-packages (from Pillow->pytesseract) (0.44)
Building wheels for collected packages: pytesseract
  Building wheel for pytesseract (setup.py) ... done
  Created wheel for pytesseract: filename=pytesseract-0.3.8-py2.py3-none-any.whl size=18780 sha256=b49587077ddccb20cbf67c10130b4c15f04fc585cbc36dcf53563d169d9df4de
  Stored in directory: c:\users\ychen\appdata\local\pip\cache\wheels\ab\76\70\c080b97e409de2fe41cf2d9ecb97f0629a66c7126eb7c9eb44
Successfully built pytesseract
Installing collected packages: pytesseract
Successfully installed pytesseract-0.3.8

• 配置路径

# 使用编辑器打开如下文件
C:\ProgramData\Anaconda3\Lib\site-packages\pytesseract\pytesseract.py

# 配置路径如下
#tesseract_cmd = 'tesseract'
tesseract_cmd = 'C:/Program Files (x86)/Tesseract-OCR/tesseract.exe'

• 代码

from PIL import Image
import pytesseract
import cv2
import os

preprocess = 'blur' #thresh

image = cv2.imread('scan.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

if preprocess == "thresh":
    gray = cv2.threshold(gray, 0, 255,cv2.THRESH_BINARY | cv2.THRESH_OTSU)[1]

if preprocess == "blur":
    gray = cv2.medianBlur(gray, 3)
    
filename = "{}.png".format(os.getpid())
cv2.imwrite(filename, gray)
    
text = pytesseract.image_to_string(Image.open(filename))
print(text)
os.remove(filename)

cv2.imshow("Image", image)
cv2.imshow("Output", gray)
cv2.waitKey(0)   

• 执行结果

点击查看详情

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