参考 tesseract-ocr

python: https://github.com/jiweibo/SSOCR

https://ourcodeworld.com/articles/read/741/how-to-recognize-seven-segment-displays-content-with-ssocr-seven-segment-optical-character-recognition-in-ubuntu-1604

sudo apt-get update
sudo apt-get install libx11-dev
sudo apt-get install libimlib2-dev

git clone https://github.com/auerswal/ssocr.git

cd ssocr

make

sudo mv ./ssocr /usr/local/bin/ssocr

ssocr --version