Tesseract OCRで文字認識をする　https://gihyo.jp/admin/serial/01/ubuntu-recipe/0577
7セグメント読み取り ssocr
Pythonで書くTesseract 4の基本的な使い方。APIとCLIからOCRを実行する方法 https://valmore.work/how-to-use-tesseract4-with-python/

audo apt install gimageReader tesseract-ocr

tesseract imagename outputbase [-l lang] [–oem ocrenginemode] [–psm pagesegmode] [configfiles…]

tesseract infile outfile --psm 6

https://github.com/tesseract-ocr/langdata/tree/master/jpn

/usr/local/Cellar/tesseract/4.1.0/share/tessdata