Python驗證碼識別 安裝Pillow、tesseract-ocr與pytesseract模塊的安裝以及錯誤解決

1.安裝Pillow

pip install Pillow

 

2.安裝tesseract-ocr

github地址: https://github.com/tesseract-ocr/tesseract

You can either Install Tesseract via pre-built binary package or build it from source.

 

windows:

The latest installer can be downloaded here: tesseract-ocr-setup-3.05.01.exe and tesseract-ocr-setup-4.00.00dev.exe (experimental). 

ubuntu:

sudo apt-get install tesseract-ocr

traineddata文件路徑: /usr/share/tesseract-ocr/tessdata/

 

3.安裝pytesseract

pip install pytesseract

 

遇到的問題:

1.FileNotFoundError: [WinError 2] 系統找不到指定的文件

解決方法:

方法1[推薦]: 將tesseract.exe添加到環境變量PATH中，

例如: D:\Tesseract-OCR,默認路徑爲C:\Program Files (x86)\Tesseract-OCR

注意: 爲了使環境變量生效，須要關閉cmd窗口或是關閉pycharm等ide從新啓動

方法2: 修改pytesseract.py文件，指定tesseract.exe安裝路徑

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

方法3:  在實際運行代碼中指定

pytesseract.pytesseract.tesseract_cmd = 'D:\\Tesseract-OCR\\tesseract.exe'

 

2.pytesseract.pytesseract.TesseractError: (1, 'Error opening data file \\Tesseract-OCR\\tessdata/eng.traineddata')

 解決方法:

方法1[推薦]: 

將tessdata目錄的上級目錄所在路徑(默認爲tesseract-ocr安裝目錄)添加至TESSDATA_PREFIX環境變量中

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

Please make sure the TESSDATA_PREFIX environment variable is set to the parent directory of your "tessdata" directory.

 

方法2:  在.py文件配置中指定tessdata-dir

tessdata_dir_config = '--tessdata-dir "D:\\Tesseract-OCR\\tessdata"'
# tessdata_dir_config = '--tessdata-dir "'C:\\Program Files (x86)\\Tesseract-OCR\\tessdata"'
pytesseract.image_to_string(image, config=tessdata_dir_config)

附: trainedata下載地址: the latest from github.com

 

參考文檔:

https://pypi.python.org/pypi/pytesseract

https://github.com/tesseract-ocr/tesseract/wiki