Not able to extract number from a Image - python-3.x

Question

I am developing an application to read the numbers from an image using opencv in Python 3. I first converted the image to gray scale,then Apply dilation and erosion to remove some noise, then Apply threshold to get image with only black and white, then Write the image to local disk to do some ..., then apply tesseract to recognise the number for python.
I need to extract the numbers from the image. I am new to openCV. Does anybody know any other method to get the result??
I have share the image link bellow, i was trying to extract from that image. Thanks in advance
https://drive.google.com/file/d/141y-3okLPGP_STje14ukSqSHcgtwMdRO/view?usp=sharing
import cv2
import numpy as np
import pytesseract
from PIL import Image
from pytesseract import image_to_string
# Path of working folder on Disk
src_path = "/Users/sougata.a.roy/Desktop/Images/"
def get_string(img_path):
# Read image with opencv
img = cv2.imread(img_path)
# Convert to gray
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# Apply dilation and erosion to remove some noise
kernel = np.ones((1, 1), np.uint8)
img = cv2.dilate(img, kernel, iterations=1)
img = cv2.erode(img, kernel, iterations=1)
# Write image after removed noise
cv2.imwrite(src_path + "removed_noise.jpg", img)
# Apply threshold to get image with only black and white
img = cv2.adaptiveThreshold(img, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY_INV, 31, 2)
# Write the image after apply opencv to do some ...
cv2.imwrite(src_path + 'thres.jpg', img)
# Recognize text with tesseract for python
result = pytesseract.image_to_string(Image.open(src_path + "thres.jpg"), lang='eng')
return result
print('--- Start recognize text from image ---')
print(get_string(src_path + 'abcdefg195.jpg'))
print("------ Done -------")
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