Unable To Detect Face And Eye With OpenCV In Python

This code is to detect face and eyes using webcam but getting this error Traceback (most recent call last): File 'D:/Acads/7.1 Sem/BTP/FaceDetect-master/6.py', line 28, in <

Solution 1:

I think it is just a problem of indentation.

roi is out of scope when you go out of the faces loop.

for (x, y, w, h) in faces:
    cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)
    roi = frame[y:y+h, x:x+w]

    # eyes detection runs for each face
    eyes = eyeCascade.detectMultiScale(roi)
    for (ex,ey,ew,eh) in eyes:
        cv2.rectangle(roi,(ex,ey),(ex+ew,ey+eh), 255, 2)