如何在OpenCV中对一张人脸图像(人脸图)绘制多条线？

import cv2
import numpy as np

image = cv2.imread('path_to_image.jpg')

face_cascade = cv2.CascadeClassifier('path_to_cascade.xml')

gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

faces = face_cascade.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=5, minSize=(30, 30))

for (x, y, w, h) in faces:
    # 绘制矩形框
    cv2.rectangle(image, (x, y), (x+w, y+h), (0, 255, 0), 2)
    
    # 绘制多条线
    cv2.line(image, (x, y), (x+w, y+h), (255, 0, 0), 2)
    cv2.line(image, (x+w, y), (x, y+h), (255, 0, 0), 2)
    cv2.line(image, (x, y+h//2), (x+w, y+h//2), (255, 0, 0), 2)
    cv2.line(image, (x+w//2, y), (x+w//2, y+h), (255, 0, 0), 2)

cv2.imshow('Face Detection', image)
cv2.waitKey(0)
cv2.destroyAllWindows()