Tesseract and OCR can't recognize digital-like fonts
Have a look at Text detection on Seven Segment Display via Tesseract OCR or https://github.com/Shreeshrii/tessdata_ssd or search for "seven segment ocr"
Have a look at Text detection on Seven Segment Display via Tesseract OCR or https://github.com/Shreeshrii/tessdata_ssd or search for "seven segment ocr"