python - Pytesseract read coloured text

Question

I am trying to read coloured (red and orange) text with Pytesseract. I tried to not grayscale the image, but that didn't work either.

Images, that it CAN read

Images, that it CANNOT read

My current code is:

        tesstr = pytesseract.image_to_string(
                    cv2.cvtColor(nm.array(cap), cv2.COLOR_BGR2GRAY),
                    config="--psm 7")

question from:https://stackoverflow.com/questions/65881472/pytesseract-read-coloured-text

Answer 1

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