This little function (below) will do for any color
ec9Ut.png
Thresh result
x18MN.png
Thresh result
SFr48.png
Thresh result
import cv2
from pytesseract import image_to_string
def getText(filename):
img = cv2.imread(filename)
HSV_img = cv2.cvtColor(img,cv2.COLOR_BGR2HSV)
h,s,v = cv2.split(HSV_img)
thresh = cv2.threshold(v, 0, 255, cv2.THRESH_BINARY_INV + cv2.THRESH_OTSU)[1]
txt = image_to_string(thresh, config="--psm 6 digits")
return txt
text = getText('ec9Ut.png')
print(text)
text = getText('x18MN.png')
print(text)
text = getText('SFr48.png')
print(text)
Output
46
31
53
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