Python 无法从图像中读取文本 [Python OCR with Tesseract]

Question

I have this issue with reading exactly two lines of numbers (each line contains max of 3 digits) from an image.

My Python code has a big problem with reading a data from images like the ones below:

Most of the times it is just printing random numbers. What should I do to make this work?

This is my Python code:

from PIL import ImageGrab, Image
from datetime import datetime
from pytesseract import pytesseract
import numpy as nm


pytesseract.tesseract_cmd = 'F:\\Tesseract\\tesseract'

while True:
    screenshot = ImageGrab.grab(bbox=(515, 940, 560, 990))
    datetime = datetime.now()
    filename = 'pic_{}.{}.png'.format(datetime.strftime('%H%M_%S'), datetime.microsecond / 500000)

    gray = screenshot.convert('L')
    bw = nm.asarray(gray).copy()

    bw[bw < 160] = 0
    bw[bw >= 160] = 255

    convertedScreenshot = Image.fromarray(bw)

    tesseract = pytesseract.image_to_string(convertedScreenshot, config='digits --psm 6')

    convertedScreenshot.save(filename)

    print(tesseract)

The image has to have white text on the black background or the black text on the white background.

It is also important to save the image afterwards.

Answer 1

Tesseract works best on images having black text on white Background. Invert the image before using tesseract by adding the below line:

 convertedScreenshot = 255 - convertedScreenshot