Detect face from ip camera using opencv

Question

I am trying to use an IP camera to detect faces by opencv(python) by 192.168.1.36:8080 url. I can connect to a mobile camera (Ip camera) perfectly but openCV cannot detect faces. When I use laptop camera everything fine but by Ip camera, I cannot detect faces. It's my code:

import dlib
import cv2

detector = dlib.get_frontal_face_detector()
cam = cv2.VideoCapture("http://192.168.1.40:8080")
color_green = (0,255,0)
line_width = 3
while True:
    ret_val, img = cam.read()
    # rgb_image = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
    dets = detector(img)
    for det in dets:
        cv2.rectangle(img,(det.left(), det.top()), (det.right(), det.bottom()), color_green, line_width)
    cv2.imshow('my webcam', img)
    if cv2.waitKey(1) == 27:
        break  # esc to quit
cv2.destroyAllWindows()

I get this error:

Traceback (most recent call last): File "/home/nima-s-h/PycharmProjects/FaceRecoUsingDlib/FaceDetector.py", line 14, in cv2.imshow('frame', frame) cv2.error: OpenCV(4.1.0) /io/opencv/modules/highgui/src/window.cpp:352: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

What do you mean by "I cannot detect faces" ? dets is always empty or you get an error ? — emlot77, Jun 20 '19 at 08:08
It seems that the `cv2.VideoCapture` has not been initialized correctly due to an invalid URL, thus returning an empty frame. The `img` variable should be `None` and `ret_val` should be `False` in this case. Replace `while True:` with `while cam.isOpened():` and see if the error is still there. — sgarizvi, Jun 20 '19 at 09:10
I solve this problem by rtsp://192.168.1.4:8080/h264_ulaw.sdp url. but I opencv cannot detect face — Nima.S-H, Jun 20 '19 at 09:14
Now the video stream is good but you have empty dets? Did you check that the input image in the function detector(img) is correct ? — emlot77, Jun 20 '19 at 09:22
check in your loop if your cam isOpened...and display the image. your error says that there is no image to be displayed in imshow — Y.AL, Jun 20 '19 at 10:33
Dear @emlot77 video stream is fine but opencv could not find face, It dosent work — Nima.S-H, Jun 20 '19 at 13:43

score 0 · Answer 1 · edited Jul 20 '19 at 18:38

0

Try this address:

http://192.168.1.40:8080/abc.mjpg

instead of

http://192.168.1.40:8080

edited Jul 20 '19 at 18:38

Ronan Boiteau

9,608
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answered Jul 20 '19 at 17:56

Harjeet Singh

1

Detect face from ip camera using opencv

1 Answers1