How to detect subscript numbers in an image using OCR?

Question

I am using tesseract for OCR, via the pytesseract bindings. Unfortunately, I encounter difficulties when trying to extract text including subscript-sty

Answer 1

This is because the font of subscript is too small. You could resize the image using a python package such as cv2 or PIL and use the resized image for OCR as coded below.

import pytesseract
import cv2

img = cv2.imread('test.jpg')
img = cv2.resize(img, None, fx=2, fy=2)  # scaling factor = 2

data = pytesseract.image_to_string(img)
print(data)

OUTPUT:

CH3