如何使用opncv计算给定底部矩形的顶部坐标？

import cv2
import numpy as np

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

edges = cv2.Canny(gray, 50, 150)

contours, _ = cv2.findContours(edges, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

top_coordinates = []
for contour in contours:
    x, y, w, h = cv2.boundingRect(contour)
    top_coordinates.append((x, y))

for coordinate in top_coordinates:
    print("Top coordinate:", coordinate)