from SimpleCV import Camera, Display
import cv2
cam = Camera()
disp = Display(cam.getImage().size())
while disp.isNotDone():
img = cam.getImage()
f = img.findHaarFeatures('/路径/haarcascades/haarcascade_frontalface_alt.xml')
if f is not None:
f = f.sortArea()
f.draw()
img.save(disp)