python opencv获取图像坐标,在python opencv中查找图像的所有X和Y坐标

I am a beginner in opencv-python. I want to get all the X and Y coordinates of for the region of the interest mentioned in the code and store it in an array. Can anyone give me an idea on how to proceed? I was able to run the code, but is not showing any results.

Image for detecting all the X and Y coordinates

The sample code i wrote is written below,

import cv2

import numpy as np

import matplotlib.pyplot as plt

import imutils

img = cv2.imread("/home/harikrishnan/Desktop/image.jpg",0)

img1 = imutils.resize(img)

img2 = img1[197:373,181:300] #roi of the image

ans = []

for y