create_database.py

# create_database.py
import cv2, sys, numpy, os, time
count = 0
size = 4
fn_haar = 'haarcascade_frontalface_default.xml'
fn_dir = 'database'
fn_name = sys.argv[1]   #name of the person
path = os.path.join(fn_dir, fn_name)
if not os.path.isdir(path):
    os.mkdir(path)
(im_width, im_height) = (112, 92)
haar_cascade = cv2.CascadeClassifier(fn_haar)
webcam = cv2.VideoCapture(0)


print "-----------------------Taking pictures----------------------"
print "--------------------Give some expressions---------------------"
# The program loops until it has 20 images of the face.

while count < 45:
    (rval, im) = webcam.read()
    im = cv2.flip(im, 1, 0)
    gray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY)
    mini = cv2.resize(gray, (gray.shape[1] / size, gray.shape[0] / size))
    faces = haar_cascade.detectMultiScale(mini)
    faces = sorted(faces, key=lambda x: x[3])
    if faces:
        face_i = faces[0]
        (x, y, w, h) = [v * size for v in face_i]
        face = gray[y:y + h, x:x + w]
        face_resize = cv2.resize(face, (im_width, im_height))
        pin=sorted([int(n[:n.find('.')]) for n in os.listdir(path)
               if n[0]!='.' ]+[0])[-1] + 1
        cv2.imwrite('%s/%s.png' % (path, pin), face_resize)
        cv2.rectangle(im, (x, y), (x + w, y + h), (0, 255, 0), 3)
        cv2.putText(im, fn_name, (x - 10, y - 10), cv2.FONT_HERSHEY_PLAIN,
            1,(0, 255, 0))
	time.sleep(0.38)        
	count += 1
   
    	
    cv2.imshow('OpenCV', im)
    key = cv2.waitKey(10)
    if key == 27:
        break
print str(count) + " images taken and saved to " + fn_name +" folder in database "