def paint_detected_face_on_image(frame, location, name=None):
    """
    Paint a rectangle around the face and write the name
    """
    # unpack the coordinates from the location tuple
    top, right, bottom, left = location

    if name is None:
        name = 'Unknown'
        color = (0, 0, 255)  # red for unrecognized face
    else:
        color = (0, 128, 0)  # dark green for recognized face

    # Draw a box around the face
    cv2.rectangle(frame, (left, top), (right, bottom), color, 2)

    # Draw a label with a name below the face
    cv2.rectangle(frame, (left, bottom - 35), (right, bottom), color, cv2.FILLED)
    cv2.putText(frame, name, (left + 6, bottom - 6), cv2.FONT_HERSHEY_DUPLEX, 1.0, (255, 255, 255), 1)