如何将所有白色像素的坐标添加到数组中？OpenCV Python

import cv2
import numpy as np

image = cv2.imread('image.jpg')
gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

_, threshold_image = cv2.threshold(gray_image, 200, 255, cv2.THRESH_BINARY)

white_pixels = np.where(threshold_image == 255)

white_pixels_coordinates = np.column_stack((white_pixels[1], white_pixels[0]))