take pictures from webcam python

1import cv2
2
3cap = cv2.VideoCapture(0)
4
5# Check if the webcam is opened correctly
6if not cap.isOpened():
7    raise IOError("Cannot open webcam")
8
9while True:
10    ret, frame = cap.read()
11    frame = cv2.resize(frame, None, fx=0.5, fy=0.5, interpolation=cv2.INTER_AREA)
12    cv2.imshow('Input', frame)
13
14    c = cv2.waitKey(1)
15    if c == 27:
16        break
17
18cap.release()
19cv2.destroyAllWindows()

1import cv2
2
3cam = cv2.VideoCapture(0)
4
5cv2.namedWindow("test")
6
7img_counter = 0
8
9while True:
10    ret, frame = cam.read()
11    if not ret:
12        print("failed to grab frame")
13        break
14    cv2.imshow("test", frame)
15
16    k = cv2.waitKey(1)
17    if k%256 == 27:
18        # ESC pressed
19        print("Escape hit, closing...")
20        break
21    elif k%256 == 32:
22        # SPACE pressed
23        img_name = "opencv_frame_{}.png".format(img_counter)
24        cv2.imwrite(img_name, frame)
25        print("{} written!".format(img_name))
26        img_counter += 1
27
28cam.release()
29
30cv2.destroyAllWindows()
31

1from cv2 import *
2# initialize the camera
3cam = VideoCapture(0)   # 0 -> index of camera
4s, img = cam.read()
5if s:    # frame captured without any errors
6    namedWindow("cam-test",CV_WINDOW_AUTOSIZE)
7    imshow("cam-test",img)
8    waitKey(0)
9    destroyWindow("cam-test")
10    imwrite("filename.jpg",img) #save image
11