@staticmethod
def detect(fd_obj, image):
    """
        Returns ROI (size-4 tuple of (x, y, w, h)) of the face detected, or None
        if no face detected.

        This method may be overridden by a derived class to use your own custom
        face detector as the main routine. Simply make sure this method returns
        a face ROI is a face is detected, or None if no face is detected.
        """
    return None
