Not very accurate in reading simple equations

[Raquel Natali]

I am trying to identify an simple equation from an image. I have been trying to treat the image but it still does not give me a good result (sometimes it does not detect the math operator, sometimes it confuses the + with 4).

Can someone give me a tip? I already tried a lot of things.

Here is my current code:

            import cv2

            import pytesseract

import numpy as np

            img = cv2.imread("image.png")

            img = cv2.resize(img, None, fx=1.2, fy=1.2, interpolation=cv2.INTER_CUBIC)

            img = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

            img = cv2.threshold(img, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1]

            img = cv2.bitwise_not(img)

            kernel = np.ones((1, 1), np.uint8)

            img = cv2.erode(img, kernel, iterations=1)

            kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (1, 1))

            img = cv2.dilate(img, kernel, iterations=1)

            content = pytesseract.image_to_string(img, lang="eng+equ", config="--psm 13 -c tessedit_char_whitelist=0123456789+=")

            print(content) # prints 23431 instead of 23 + 31

Here is the image Thank you!