face_cascade = cv2.CascadeClassifier()
face_cascade.load(
  '/usr/local/anaconda3/envs/OpenCV/lib/python3.8/site-packages/cv2/data/haarcascade_frontalface_default.xml')

faces = face_cascade.detectMultiScale(gray, 1.3, 5)

# 形态学开运算去噪点
fgmask = cv2.morphologyEx(fgmask, cv2.MORPH_OPEN, kernel)
for i in range(15):
  fgmask = cv2.dilate(fgmask, kernel, iterations=1)

def resolve(o_img, mask, faces):
  if len(faces) == 0:
    return
  (x, y, w, h) = faces[0]
  rgb_mask_front = cv2.cvtColor(mask, cv2.COLOR_GRAY2BGR)
  rgb_mask_front = cv2.bitwise_not(rgb_mask_front)
  cv2.circle(rgb_mask_front, (int(x + w / 2), int(y + h / 2)), int((w + h) / 4), (0, 0, 0), thickness=-1)
  o_img = cv2.subtract(o_img, rgb_mask_front)
  return o_img

out = resolve(frame, fgmask, faces)
out = cv2.add(out, c_frame)

import numpy as np
import cv2
import os

# 经典的测试视频
camera = cv2.VideoCapture('./source/background_test2.avi')
cap = cv2.VideoCapture('./source/camera_test2.avi')
face_cascade = cv2.CascadeClassifier()
face_cascade.load(
   os.getcwd()+'/source/haarcascade_frontalface_default.xml')
# 形态学操作需要使用
kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (3, 3))
# 创建混合高斯模型用于背景建模
fgbg = cv2.createBackgroundSubtractorMOG2(detectShadows=False)


def resolve(o_img, mask, faces):
  if len(faces) == 0:
    return
  (x, y, w, h) = faces[0]
  rgb_mask_front = cv2.cvtColor(mask, cv2.COLOR_GRAY2BGR)
  rgb_mask_front = cv2.bitwise_not(rgb_mask_front)
  cv2.circle(rgb_mask_front, (int(x + w / 2), int(y + h / 2)), int((w + h) / 4), (0, 0, 0), thickness=-1)
  o_img = cv2.subtract(o_img, rgb_mask_front)
  return o_img


while True:
  ret, frame = cap.read()
  c_ret, c_frame = camera.read()
  gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

  fgmask = fgbg.apply(frame)
  # 形态学开运算去噪点
  fgmask = cv2.morphologyEx(fgmask, cv2.MORPH_OPEN, kernel)
  gray_camera = cv2.cvtColor(c_frame, cv2.COLOR_BGR2GRAY)

  for i in range(15):
    fgmask = cv2.dilate(fgmask, kernel, iterations=1)

  faces = face_cascade.detectMultiScale(gray, 1.3, 5)
  out = resolve(frame, fgmask, faces)
  out = cv2.add(out, c_frame)
  cv2.imshow('Result', out)
  cv2.imshow('Mask', fgmask)
  k = cv2.waitKey(150) & 0xff
  if k == 27:
    break
out.release()
camera.release()
cap.release()
cv2.destroyAllWindows()