def _get_or_create_img_info(self, id_):
    if (id_ not in self._img_info):
        self._img_info[id_] = [ImgInfo(*info) for info in self.meta_dict[id_]['frame_info']]
    return self._img_info[id_]
def _get_or_create_img_info(self, id_):
    if (id_ not in self._img_info):
        self._img_info[id_] = [ImgInfo(*info) for info in self.meta_dict[id_]['frame_info']]
    return self._img_info[id_]