如何在opencv中使用圆形边框模糊人脸- Python？

import cv2
import numpy as np

face_cascade = cv2.CascadeClassifier('path/to/haarcascade_frontalface_default.xml')
image = cv2.imread('path/to/image.jpg')

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:
    # 提取人脸区域
    face_roi = image[y:y+h, x:x+w]
    
    # 创建圆形掩膜
    mask = np.zeros((h, w), dtype=np.uint8)
    center = (x + w // 2, y + h // 2)
    radius = min(w, h) // 2
    cv2.circle(mask, center, radius, (255, 255, 255), -1)
    
    # 应用模糊效果
    blurred_face = cv2.GaussianBlur(face_roi, (99, 99), 30)
    
    # 将模糊后的人脸区域放回原图像
    image[y:y+h, x:x+w] = cv2.bitwise_and(blurred_face, blurred_face, mask=mask)

cv2.imshow('Blurred Faces', image)
cv2.waitKey(0)
cv2.destroyAllWindows()