add_face_markers.py

def add_face_markers(frame):
    """
    Adding face markers onto a single frame
    """
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    rects = detector(gray, 0)

    for (i, rect) in enumerate(rects):
        shape = predictor(gray, rect)
        shape = face_utils.shape_to_np(shape)

        # convert dlib's rectangle to a OpenCV-style bounding box
        # [i.e., (x, y, w, h)], then draw the face bounding box
        (x, y, w, h) = face_utils.rect_to_bb(rect)
        cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
        # show the face number
        cv2.putText(frame, "Face #{}".format(i + 1), (x - 10, y - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2)

        for (x,y) in shape:
            cv2.circle(frame, (x,y), 1, (0,255,0), -1)
    return frame