python opencv realize Face Detection

lab environment

• A windows laptop with a camera can MacOS

• anaconda+pycharm

  Configuration Software Environment

  anaconda to the official website to download, I chose Python3.7 version, you can download and install.
  PyCharm to the official website to download, install it after downloading.

  The source

  import cv2
  import numpy as np
  cap = cv2.VideoCapture(0)
  while True:
  ret, frame = cap.read()
  cv2.flip(frame, 1, frame)
  face_cascade = cv2.CascadeClassifier("haarcascade_frontalface_default.xml")
  eye_cascade = cv2.CascadeClassifier("haarcascade_eye.xml")
  face = face_cascade.detectMultiScale(frame)
  eye = eye_cascade.detectMultiScale(frame)
  for (x, y, w, h) in face:
  cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)

    for (x, y, w, h) in eye:
        cv2.rectangle(frame, (x, y), (x + w, y + h), (255, 255, 0), 2)
  
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
    if cv2.waitKey(1) & 0xFF == ord('s'):
        cv2.imwrite("a.jpg", frame)

  cap.release()