old_contents: import numpy as np
  import cv2
  
  face_cascade = cv2.CascadeClassifier('/home/tianyiz/user/601project/c/haarcascade_frontalface_alt.xml')
  #face_cascade = cv2.CascadeClassifier('/home/tianyiz/user/601project/c/haarcascade_upperbody.xml')
  
  cap = cv2.VideoCapture(0)
  
  while 1:
  	ret, img = cap.read()
  	gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
  	cv2.imshow('img',gray)
  	faces = face_cascade.detectMultiScale(gray, 1.3, 5)
  	for (x,y,w,h) in faces:
  		print(x,y,w,h)
  		cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)        
  		roi_gray = gray[y:y+h, x:x+w]
  		roi_color = img[y:y+h, x:x+w]
  	cv2.imshow('img',img)
  	k = cv2.waitKey(30) & 0xff
  	if k == 27:
  		break
  
  cap.release()
  cv2.destroyAllWindows()
  
new_contents: import numpy as np
  import cv2
  
  face_cascade = cv2.CascadeClassifier('/home/tianyiz/user/601project/c/haarcascade_frontalface_alt.xml')
  #ATTENTION!!you need to change the address of the xml file as where you put it
  cap = cv2.VideoCapture(0)
  
  while 1:
  	ret, img = cap.read()
  	gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
  	cv2.imshow('img',gray)
  	faces = face_cascade.detectMultiScale(gray, 1.3, 5)
  	for (x,y,w,h) in faces:
  		print(x,y,w,h)
  		cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)        
  		roi_gray = gray[y:y+h, x:x+w]
  		roi_color = img[y:y+h, x:x+w]
  	cv2.imshow('img',img)
  	k = cv2.waitKey(30) & 0xff
  	if k == 27:
  		break
  
  cap.release()
  cv2.destroyAllWindows()
  
subject: Update face.py