Pytesseract doesnt recognize simple text in image

Question

I want to recognize a image like this:

I am using the following config:

config="--psm 6 --oem 3 -c tessedit_char_whitelist=0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ,."

but when I try to convert that, I get the following:

1581

1

W

I think that the image shows really clearly what is written and think that there is a problem with pytesseract. Can you help?

it also happened for me, one time it showed me a star as a dot, while there are so many stars in the same image, don't know whats wrong... but i didn't use any configs — Ghost Ops
– Ghost Ops, Commented Sep 20, 2021 at 14:47
@GhostOps Yes but with such a clean image this must be possible right? — Moritz Pfennig
– Moritz Pfennig, Commented Sep 20, 2021 at 14:48

nathancy · Accepted Answer · 2021-09-21 00:15:15Z

Preprocessing the image to obtain a binary image before performing OCR seems to work. You could also try to resize the image so that more details would be seen

Results

158.1 1 IT

import cv2 import pytesseract pytesseract.pytesseract.tesseract_cmd = r"C:\Program Files\Tesseract-OCR\tesseract.exe" # Grayscale and Otsu's threshold image = cv2.imread('1.png') gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1] # Perform text extraction data = pytesseract.image_to_string(thresh, lang='eng', config='--psm 6') print(data) cv2.imshow('thresh', thresh) cv2.waitKey()

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